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Climate of the Past An interactive open-access journal of the European Geosciences Union
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CP | Articles | Volume 14, issue 10
Clim. Past, 14, 1529–1542, 2018
https://doi.org/10.5194/cp-14-1529-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue: The 4.2 ka BP climatic event

Clim. Past, 14, 1529–1542, 2018
https://doi.org/10.5194/cp-14-1529-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Review article 22 Oct 2018

Review article | 22 Oct 2018

The 4.2 ka BP event in the Levant

The 4.2 ka BP event in the Levant
David Kaniewski1,2,3, Nick Marriner4, Rachid Cheddadi5, Joël Guiot6, and Elise Van Campo1,2 David Kaniewski et al.
  • 1Université Paul Sabatier-Toulouse 3, EcoLab (Laboratoire d'Ecologie Fonctionnelle et Environnement), Bâtiment 4R1, 118 Route de Narbonne, 31062 Toulouse cedex 9, France
  • 2CNRS, EcoLab (Laboratoire d'Ecologie Fonctionnelle et Environnement), 31062 Toulouse cedex 9, France
  • 3Institut Universitaire de France, Secteur Biologie-Médecine-Santé, 103 boulevard Saint Michel, 75005 Paris, France
  • 4CNRS, Laboratoire Chrono-Environnement UMR6249, MSHE Ledoux, USR 3124, Université de Bourgogne-Franche-Comté, UFR ST, 16 Route de Gray, 25030 Besançon, France
  • 5Université Montpellier II, CNRS-UM2-IRD, ISEM, France
  • 6Aix-Marseille Université, CEREGE, CNRS, UM34, Europôle de l'Arbois BP80, 13545 Aix-en-Provence, France

Correspondence: David Kaniewski (david.kaniewski@univ-tlse3.fr)

Abstract
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The 4.2 ka BP event is defined as a phase of environmental stress characterized by severe and prolonged drought of global extent. The event is recorded from the North Atlantic through Europe to Asia and has led scientists to evoke a 300-year global mega-drought. For the Mediterranean and the Near East, this abrupt climate episode radically altered precipitation, with an estimated 30 %–50 % drop in rainfall in the eastern basin. While many studies have highlighted similar trends in the northern Mediterranean (from Spain to Turkey and the northern Levant), data from northern Africa and the central-southern Levant are more nuanced, suggesting a weaker imprint of this climate shift on the environment and/or different climate patterns. Here, we critically review environmental reconstructions for the Levant and show that, while the 4.2 ka BP event also corresponds to a drier period, a different climate pattern emerges in the central-southern Levant, with two arid phases framing a wetter period, suggesting a W-shaped event. This is particularly well expressed by records from the Dead Sea area.

1 Introduction
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While severe climate changes have been recorded during the Holocene (e.g., Mayewski et al., 2004; Wanner et al., 2008; Magny et al., 2013; Solomina et al., 2015; Guiot and Kaniewski, 2015) with uncertain overall effects, one period of increasing aridity, termed the 4.2 ka BP event (e.g., Weiss, 2016, 2017), has fueled debates on the causal link between climate shifts and societal upheavals during the Bronze Age (e.g., Finné et al., 2011; Butzer, 2012; Clarke et al., 2016). The 4.2 ka BP event, which lasted ∼300 years (from 4200 to 3900 cal yr BP), is probably one of the Holocene's best studied climatic events (e.g., Weiss et al., 1993; Cullen et al., 2000; deMenocal, 2001; Weiss and Bradley, 2001; Staubwasser and Weiss, 2006; Weiss, 2017; Manning, 2018; and references therein), although its chronology may be much wider than traditionally reported, extending from 4500 to 3500 BP (Gasse, 2000; Booth et al., 2005). This phase of aridity, considered to be of global extent (Booth et al., 2005, 2006; Fisher et al., 2008; Baker et al., 2009; Wanner et al., 2011, 2015), is now used as a formal boundary to separate the Middle and Late Holocene (Late Holocene Meghalayan Age; Walker et al., 2012; Zanchetta et al., 2016; and letter from the International Union of Geological Sciences). According to Arz et al. (2006), most records show a gradual climate shift rather than a specific abrupt event. Drought co-occurs with widespread cooling in the North Atlantic from 4300 to 4000 BP, as attested in Iceland (lake Hvítárvatn and lake Haukadalsvatn; Geirsdóttir et al., 2013; Blair et al., 2015). The event is also characterized by two short spikes of negative-type North Atlantic oscillations (NAOs) at 4300 and 3950 BP (Olsen et al., 2012). During this interval, the Atlantic subpolar and subtropical surface waters cooled by 1 to 2 C (Bond et al., 1997, 2001; Bianchi and McCave, 1999; deMenocal, 2001).

Focusing on the 4.2 ka BP event in the Mediterranean, a detailed vegetation-based model shows that a significant drop in precipitation began in the eastern basin at ∼4300 BP. These drier conditions lasted until 4000 BP with peaks in drought during the period 4300–4200 BP (Guiot and Kaniewski, 2015). Based on these modeling data (and the selected datasets), the western Mediterranean does not appear to have been significantly affected by the precipitation anomaly. A climate model reported by Brayshaw et al. (2011) also suggests that the eastern Mediterranean was drier, while the whole Mediterranean exhibited an increase in precipitation for the period 6000–4000 BP. A bipolar east–west “climate seesaw” was proposed to explain these contrasting spatiotemporal trends during the last millennia, with the hydro-climatic schemes across the basin being mediated by a combination of different climate modes (Roberts et al., 2012). It has been argued that the 4.2 ka BP event resulted from changes in the direction and intensity of the cyclonic North Atlantic westerlies, controlled by the NAO (e.g., Cullen et al., 2002; Kushnir and Stein, 2010; Lionello et al., 2013). These westerlies modulate moisture transport across the Mediterranean and western Asia (see full map in Weiss, 2017) and, in the Mediterranean, interact with the tropical (monsoonal) climatic system (e.g., Rohling et al., 2002; Lamy et al., 2006; Lionello et al., 2006; Magny et al., 2009). The “climate seesaw” model further suggests that precipitation regimes could not have solely been modulated by NAO forcing, but also by other patterns (e.g., polar Eurasia and the eastern Atlantic–western Russia) that acted in synergy (see full details in Roberts et al., 2012). For instance, other climate regimes, such as shifts in the Intertropical Convergence Zone (ITCZ), may also have played roles in mediating climate in the southern Mediterranean. In the Mediterranean basin, the 4.2 ka BP event could thus be a combination of different forcing factors (depending on the location and on seasonality) acting in tandem (e.g., Di Rita et al., 2018). Even if such hypotheses (Brayshaw et al., 2011; Roberts et al., 2012; Guiot and Kaniewski, 2015) are based merely on modeling data, they are useful in trying to understand the geographic dimensions of climate change during this period and to identify the mechanisms driving this important event.

https://www.clim-past.net/14/1529/2018/cp-14-1529-2018-f01

Figure 1Geographical location of some of the main Levantine sites discussed in this study. Nearby sites in Turkey and Egypt are also displayed on the map (see the text for full references).

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Here, we examine several records from the Levant to critically review the climate context of the 4.2 ka BP event in the eastern Mediterranean (Fig. 1). Our review is based on the core area of the central-southern Levant comprising Israel, the West Bank, and Jordan, as well as on the northern Levant with Syria and Lebanon. Other regions have also been integrated into our analysis, including Egypt (Nile Delta) and the Red Sea. All data (biotic and abiotic) were z score transformed to facilitate inter-site comparisons (see citations for the original curves). The curves were directly drawn using the original values (when the data were available in open access repositories) or extracted from the publications when the raw data were not available (using the software GraphClick). This comprehensive west–east/north–south review of the Mediterranean data places emphasis on different climate patterns and climatic modes.

2 Chronology
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The comparison of multiple 4.2 ka BP records involves assumptions regarding the relative weight of such variables in shaping the final outcomes and also requires strong evidence regarding the sensitivity of each proxy to fully record the environmental parameters. Our review also underscores the importance of robust chronologies in examining the spatial dimensions of the 4.2 ka BP event and its driving mechanisms. The age model of some of the climate proxies is built on radiocarbon (14C) chronologies, with sometimes broad chronological windows due to the 2σ calibrations. Telford et al. (2004) have previously shown that any single value, not its intercept or any other calculation, adequately describes the complex shape of a 14C probability density function and that the use of the full probability distribution is recommended. Because it is impossible to critically revaluate each sequence mentioned in this review, one must refer to the original papers for further information. To reduce the uncertainties resulting from the calibration of 14C measurements, high-resolution chronological datasets (e.g., Sharifi et al., 2015; Cheng et al., 2015) here serve as anchor points for other sequences.

3 A west–east gradient – northern Mediterranean
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While Mediterranean climate models (Brayshaw et al., 2011; Guiot and Kaniewski, 2015) suggest that the 4.2 ka BP event is best expressed in the eastern Mediterranean and western Asia, drought nonetheless seems to be recorded in both western and eastern areas. A short review of the paleoclimate data from Spain to Turkey puts these drier conditions in a wider perspective.

In Spain, drier environmental conditions were recorded at several locations such as the Doñana National Park (Jiménez-Moreno et al., 2015), Sierra de Gádor (Carrión et al., 2003), Borreguiles de la Virgen (Jiménez-Moreno and Anderson, 2012), and Lake Montcortès (Scussolini et al., 2011). Further east, in Italy, several sites such as Renella Cave (Fig. 2; Drysdale et al., 2006; Zanchetta et al., 2016), Corchia Cave (Fig. 2; Regattieri et al., 2014), and Lake Accesa (Magny et al., 2009; revised chronology in Zanchetta et al., 2018) clearly point to a drought event. In Croatia, a drier climate is attested at Lake Vrana (Island of Cres; Schmidt et al., 2000), Bokanjačko blato karst polje (Dalmatia; Ilijanić et al., 2018), and at Mala Špilja Cave (island of Mljet; Lončar et al., 2017). In the Balkan Peninsula, Lake Shkodra (Fig. 2; Albania, Montenegro; Zanchetta et al., 2012), Lake Prespa (Republics of Macedonia, Albania, and Greece; Wagner et al., 2010), Lake Ohrid (Republics of Macedonia and Albania; Wagner et al., 2010), and Lake Dojran (Fig. 2; Macedonia, Greece; Francke et al., 2013; Thienemann et al., 2017; Rothacker et al., 2018) were also hit by drought, but of varying intensities. In Albania, a pollen-based model underscores a moderate decline in precipitation at Lake Maliq (Korçë; Bordon et al., 2009). In Greece, the Mavri Trypa Cave (Peloponnese; Finné et al., 2017) and the Omalos Polje karstic depression (Crete; Styllas et al., 2018) displayed a period of drier conditions centered on the 4.2 ka BP event. In Turkey, the last “northern geographic step” before the Levant, drought is suggested at several locations. At Nar Gölü (Dean et al., 2015), Lake Van (Lemcke and Sturm, 1996; Wick et al., 2003), Gölhisar Gölü (Eastwood et al., 1999), and Eski Acıgöl (Roberts et al., 2008), drier conditions seem to prevail.

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Figure 2Paleoclimate series (z score transformed), with the type of climate proxy noted. The orange vertical band represents the 4.2 ka BP event. From top to bottom: Renella Cave (Italy; Drysdale et al., 2006; Zanchetta et al., 2016), Corchia Cave (Italy; Regattieri et al., 2014), Lake Shkodra (Albania and Montenegro; Zanchetta et al., 2012), Lake Dojran (Macedonia and Greece; Francke et al., 2013; Thienemann et al., 2017), and the eastern Mediterranean (Kaniewski et al., 2013).

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These data from the northern Mediterranean point to a drought episode broadly correlated with the chronological window of the 4.2 ka BP event. This climate shift was recently framed by the Agnano–Mt. Spina (∼4400 BP) and the Avellino tephra layers (∼3900 BP) in cores from the central Mediterranean (Zanchetta et al., 2018). As a consequence, the chronology of previous paleoenvironmental studies, including Lake Accesa, have been revised in line with this tephrostratigraphy (Zanchetta et al., 2018).

Knowledge gaps remain regarding the teleconnections and synergy between different climate patterns and their relative weight, according to the geographical location of the sites considered. The potential climate changes that may have impacted the northern Mediterranean during the 4.2 ka BP event have been extensively reviewed in the literature (e.g., Drysdale et al., 2006; Magny et al., 2009; Dean et al., 2015; Zanchetta et al., 2016; Di Rita et al., 2018) and will be discussed elsewhere in this special issue.

4 A west–east gradient – southern Mediterranean
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Even if the 4.2 ka BP event is clearly delineated in the northern basin, the southern Mediterranean shows different trends due to the influence of Saharan climate. While similar dry conditions occurred concurrently in Morocco (Tigalmamine, Middle Atlas; Lambs et al., 1995; Cheddadi et al., 1998) and Algeria (Gueldaman GLD1 Cave; Ruan et al., 2016), the same arid conditions led to enhanced sediment delivery mediated by flash-flood activity (mainly due to poor vegetation cover) during the 4.2 ka BP event. Such extreme hydrological events are documented in fluvial stratigraphy from northern Africa (both in Morocco and Tunisia), especially during the period 4100–3700 BP (Faust et al., 2004; Benito et al., 2015). These hydrological events have also been identified in central Tunisia, a desert margin zone characterized by a transition from the subhumid Mediterranean to arid Saharan climate. Increased flood activity in river systems also occurred locally during the period 4100–3700 BP (Zielhofer and Faust, 2008). In the central Medjerda basin (northern Tunisia), enhanced fluvial dynamics started earlier, at ∼4700 BP, and lasted until ∼3700 BP (Faust et al., 2004).

Further east in Libya, the most dramatic environmental change in the area related to the onset of dry conditions took place earlier, at ∼5000 years BP in Tadrart Acacus (Libyan Sahara; Cremaschi and Di Lernia, 1999). In the Jefara Plain, northwestern Libya, the “late Holocene arid climate period” started after 4860–4620 BP (Giraudi et al., 2013). These two distant Libyan areas are both dominated by Saharan climate, even though the Mediterranean is only 100 km from the Jefara Plain. This is consistent with data from Giraudi et al. (2013), indicating that the Saharan climate extends to the coast of the Mediterranean Sea in Libya. Focusing on the Saharan climate and the African monsoon, a general deterioration of the terrestrial ecosystem is indicated at Lake Yoa, northern Chad, during the period ∼4800–4300 BP. Since 4300 BP, widespread dust mobilization and the rapid transition (4200–3900 BP) from a freshwater habitat to a salt lake are both recorded (Kröpelin et al., 2008).

In Egypt, the last “southern step” before the Levant, no major changes have been recorded at Lake Qarun (the deepest part of the Faiyum Depression; Baioumy et al., 2010), including the desiccation of Nile-fed Lake Faiyum occurring at ∼4200 BP according to Hassan (1997). A recent study showed that Lake Qarun was low during the 4.2 ka BP event and that its level continued to fall until 3200 BP, in accordance with the conclusions of Hassan (1997). The lake was finally cut off from the Nile, with only rare inflows suggested by clayey silt depositions (Marks et al., 2018). The level of Lake Moeris (Faiyum Depression) dropped at ∼4400 BP and rose again at ∼4000 BP (Hassan, 1986). During the 4.2 ka BP event, Nile base-flow conditions changed considerably with reduced inputs from the White Nile, a dominant contribution from the Blue Nile, and diminished precipitation (Stanley et al., 2003; Véron et al., 2013). The source of the Blue Nile, Lake Tana (Fig. 3), also manifests a drier phase, leading to a reduction in Nile flow during the same period (Marshall et al., 2011), in phase with other regional paleoclimate archives (Chalié and Gasse, 2002; Thompson et al., 2002). This drop in and/or failure of Nile floods was recorded by a decreased Nile sediment supply (Fig. 3; Marriner et al., 2012), while in the Burullus Lagoon (Nile Delta), reduced flow directly impacted marshland vegetation (Bernhardt et al., 2012). The Nile Delta region is not directly affected by monsoonal rainfall (this was also the case during the Holocene and at longer Pleistocene timescales; Rossignol-Strick, 1983; Arz et al., 2003; Felis et al., 2004; Grant et al., 2016). However, the Nile's hydrological regime is essentially mediated by river discharge upstream, i.e., by the East African monsoon regime, and only secondarily by in situ Mediterranean climatic conditions (Flaux et al., 2013; Macklin et al., 2015). In the northern Red Sea, located between the Mediterranean and African–SW Asian monsoonal rainfall regimes, the 4.2 ka BP event has been identified by enhanced evaporation and increased salinity in the Shaban Deep basin (Fig. 3; Arz et al., 2006).

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Figure 3Paleoclimate series (z score transformed), with the type of climate proxy noted. The orange vertical band represents the 4.2 ka BP event. From top to bottom: Sofular Cave (Turkey; Göktürk et al., 2011), Neor Lake (Iran; Sharifi et al., 2015), Tell Tweini (Syria; Kaniewski et al., 2008), the Nile (Egypt; Marriner et al., 2012), Lake Tana (Marshall et al., 2011), and the Shaban Deep (Red Sea; Arz et al., 2006).

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All of this evidence from the southern Mediterranean and northern Africa points to hydrological instability, both during and around the 4.2 ka BP event, due to multiple climate influences, mainly from Saharan Africa. In many North African cases, records show that climate changes at ∼4200 BP are not characterized by abrupt events, but rather are part of either a long-term trend or multicentennial-scale variations, as suggested by Arz et al. (2006) for the Red Sea. Focusing on Nile flow, variations seem mainly to result from a shift in the dynamics of the ITCZ, which migrates latitudinally in response to both orbitally controlled climatic patterns (see Gasse, 2000; Ducassou et al., 2008; Kröpelin et al., 2008; Verschuren et al., 2009; Revel et al., 2010; Flaux et al., 2013; Marriner et al., 2013) and from changes in the El Niño–Southern Oscillation (ENSO; see Moy et al., 2002; Leduc et al., 2009; Wolff et al., 2011), an important driver of decadal variations in precipitation over large parts of Africa (Indeje et al., 2000; Nicholson and Selato, 2000). The period encompassing the 4.2 ka BP event is consistent with a decrease in ENSO-like frequency and a southern shift in the mean summer position of the ITCZ (Mayewski et al., 2004; Marshall et al., 2011) that may have reduced the interactions between ENSO-like frequency and the Ethiopian monsoon (Moy et al., 2002; Marriner et al., 2012).

5 The 4.2 ka BP event in the northern Levant
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Environmental data from the northern Levant derive from several locations in Syria and Lebanon, spatially distributed from the coastal strip to the dry inland areas.

5.1 Syria

The northern coastal lowlands of Syria, where Tell Tweini (Fig. 3) and Tell Sukas are located, are separated from the Ghab Depression to the east by the Jabal an Nuşayriyah, a 140 km long north–south mountain range 40 to 50 km wide with peaks culminating at ∼1200 m above sea level. At Tell Tweini (Jableh), the pollen-based environmental reconstruction (TW-1 core) shows that drier conditions prevailed during the 4.2 ka BP event with weaker annual inputs of freshwater and ecological shifts induced by lower winter precipitation. The drier conditions ended at ∼3950 BP (Fig. 3; Kaniewski et al., 2008). At Tell Sukas, ∼10 km south of Tell Tweini, an increase in dryness during the 4.2 ka BP event only coincides with a decline in olive exploitation, implying milder conditions (Sorrel et al., 2016). Olive abundances remain fairly high at Tell Tweini during the event, although the Olea pollen type originated from the wild variety (oleasters; Kaniewski et al., 2009), a tree species extremely resistant to drought that can survive in arid habitats (Lo Gullo and Salleo, 1988) and that cannot unequivocally be used as a proxy for “olive exploitation” (Kaniewski et al., 2009). In the Ghab Valley (e.g., van Zeist and Woldring, 1980; Yasuda et al., 2000), no reliable conclusions on climate shifts can be reported due to a floating chronology (e.g., Meadows, 2005). In continental Syria at Qameshli (near the Turkish–Iraqi border), modeled precipitation estimates (not based on paleoclimate proxy data) evoke a potential regional crisis in the rainfall regime beginning at around 4200 BP (Bryson and Bryson, 1997; Fiorentino et al., 2008), echoing Lake Neor (flank of the Talesh–Alborz Mountains, Iran), where a major dust event resulting from drier conditions is clearly depicted (Fig. 3; Sharifi et al., 2015). The Qameshli climate model was used to calculate a potential decline in precipitation at Tell Breda (near Ebla) and Ras El-Ain. The two sites show similar trends to Qameshli, with a major dry event at 4200 BP (Fiorentino et al., 2008). These “time series” (Bryson and Bryson, 1997; Fiorentino et al., 2008) are somewhat questionable as they derive solely from the macrophysical climate model developed by Bryson (1992; corrected by Fiorentino et al., 2008). More datasets are therefore needed to test the veracity of the Forientino et al. conclusions. Taking into account the outcomes of these published models, the data from Syria suggest that while the coastal area (Tell Sukas and Tell Tweini) was less affected by aridity, drought was potentially widespread inland during the 4.2 ka BP event from the south of Aleppo to the Turkish–Iraqi border. Unfortunately, no paleoenvironmental data are available for Tell Leilan despite its importance in narratives on the 4.2 ka BP event (e.g., Weiss et al., 1993; Weiss, 2016, 2017).

5.2 Lebanon

In Lebanon, the main paleoclimatic data in support of the 4.2 ka BP event derive from Jeita Cave (Fig. 4) and Al Jourd marsh (Fig. 4). Jeita Cave is located on the western flank of central Mount Lebanon. While the JeG-stm-1 stalagmite record (δ18O and δ13C) does not show compelling evidence for a rapid climate shift around 4200 BP (Verheyden et al., 2008), new records (termed J1-J3; also based on δ18O and δ13C) reveal that the 4.2 ka BP event is well defined, with a pronounced phase of climate change from 4300 to 3950 BP (Fig. 4; Cheng et al., 2015). According to Verheyden et al. (2008), due to the low time resolution of this part of the JeG-stm-1 stalagmite (one sample every 180 years), the short-lived 4.2 ka BP event may have been missed. Further north at Sofular Cave (Turkey; Fig. 3), while the stalagmite So-1 is not affected by this low temporal resolution, no consistent and convincing signature for the 4.2 ka BP event was recorded (Göktürk et al., 2011), echoing the JeG-stm-1 stalagmite record. The absence of a 4.2 ka BP signal at Sofular Cave may result from the orography of the Black Sea and high precipitation that does not reflect the surrounding Mediterranean westerlies. The climate reconstruction from Al Jourd marsh, based on environmental data from the Al Jourd reserve (∼70 km northeast of Jeita Cave), shows the same trends as the J1-J3 cores (Cheddadi and Khater, 2016). The reconstructed precipitation results display a drier phase starting at ∼4220 BP and lasting until ∼3900 BP. At Ammiq (the Bekaa Valley), a strong decline in precipitation is recorded from ∼4700 to ∼3850 BP, while at Chamsine–Anjar (Bekaa Valley), the dry phase is centered on 4400 BP before a gradual return to wet conditions that peak at ∼3930 BP (Cheddadi and Khater, 2016). The chronological discrepancies arising from Ammiq and Chamsine may potentially be the result of recalculated age models somewhat different from the original studies (Hajar et al., 2008, 2010). The age–depth models for the two records (Cheddadi and Khater, 2016) were modified and adjusted according to the marine chronostratigraphy proposed by Rossignol-Strick (1995).

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Figure 4Paleoclimate series (z score transformed), with the type of climate proxy noted. The orange vertical band represents the 4.2 ka BP event. From top to bottom: Al Jourd (Lebanon; Cheddadi and Khater, 2016), Jeita Cave (Lebanon; Cheng et al., 2015), Tel Dan (Israel; Kaniewski et al., 2017), Tel Akko (Israel; Kaniewski et al., 2013), Soreq Cave (Israel; Bar-Matthews et al., 2003; Bar-Matthews and Ayalon, 2011), and the Dead Sea (Israel; Bookman (Ken-Tor) et al., 2004; Migowski et al., 2006; Kagan et al., 2015).

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Data from Lebanon suggest that a drier period centered on the 4.2 ka BP event was recorded (Cheng et al., 2015; Cheddadi and Khater, 2016). Sites in the Bekaa Valley (Ammiq, Chamsine) indicate that the drier phase started earlier, between 4700 and 4400 BP, but these sequences are built upon revised age models. The original interpretations suggest either an imprint of the 4.2 ka BP event at ∼4000 BP (Hajar et al., 2008) or strong human impacts on the environment (Hajar et al., 2010).

6 The 4.2 ka BP event in the central-southern Levant
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In this section, the 4.2 ka BP event is presented from northern to southern Israel.

Located in the foothills of Mount Hermon in the Galilee Panhandle at the sources of the Jordan River, the site of Tel Dan (Israel) shows clear signatures of an arid event. A pollen-based environmental reconstruction depicts drier conditions characterized by a sharp drop in surface water between ∼4100 and ∼3900 BP, with two main inflections at ∼4050 and ∼3950 BP (Fig. 4; Kaniewski et al., 2017). Approximately 10 km from Tel Dan, cores from the Birkat Ram crater lake (northern Golan Heights; Schwab et al., 2004), also located in the foothills of Mount Hermon, were used to reconstruct climate trends during the last 6000 years (Neuman et al., 2007a). The authors demonstrate that annual precipitation is comparatively uniform with no distinctive fluctuations during the study period (Neuman et al., 2007a). The pollen diagram from the Hula Nature Reserve (northwestern part of former Lake Hula, Israel) shows an expansion in Olea before ∼4110 BP (Baruch and Bottema, 1999; Van Zeist et al., 2009) but, because no distinction can be made between the wild or cultivated variety, this would suggest either (i) the expansion of olive orchards or (ii) drier conditions that favored drought-resistant trees, especially during a period characterized by decreasing cereals (see diagram in Van Zeist et al., 2009). A pollen-based environmental reconstruction from the Sea of Galilee (Lake Kinneret, Israel; e.g., Baruch, 1986; Miebach et al., 2017) shows two decreases in the oak–pollen curve, interpreted as drier climate conditions at 4300 and 3950 BP (Langgut et al., 2013), which may fit within the broader framework of the 4.2 ka BP event. In the same core, a decrease in tree-pollen scores was recorded around 4000 BP. According to the authors, it is unclear whether this environmental signal is related to the 4.2 ka BP event (Schiebel and Litt, 2018).

Along the coast at Tel Akko (Acre, Israel), a pollen-based climate reconstruction shows negative precipitation anomalies centered on the period ∼4200–4000 BP, corresponding to an approximate 12 % decrease in annual precipitation (Fig. 4; Kaniewski et al., 2013, 2014). At Soreq Cave (Judaean Mountains, Israel), rainfall was ∼30 % lower for the period 4200–4050 BP (Fig. 4; Bar-Matthews et al., 1997, 1999, 2003; Bar-Matthews and Ayalon, 2011). While it has been noted that oxygen isotope ratios in speleothems cannot be used as a simple rainfall indicator (Frumkin et al., 1999; Kolodny et al., 2005; Litt et al., 2012), a similar value was suggested for the eastern Mediterranean with a decrease in annual precipitation of ∼30 % (Fig. 2; Kaniewski et al., 2013).

Focusing on the Dead Sea (Israel, Jordan, and the West Bank), a lake-level reconstruction points to two sea-level drops at ∼4400 and ∼4100 BP, separated by a short rise at ∼4200–4150 BP (Fig. 4; e.g., Bookman (Ken-Tor) et al., 2004; Migowski et al., 2006; Kagan et al., 2015). A similar short wet phase is recorded at Tel Akko at ∼4100 BP (Kaniewski et al., 2013) and ∼4000 BP at Tel Dan (Kaniewski et al., 2017), suggesting that minor chronological discrepancies can result from radiocarbon dating. The pollen-based environmental reconstruction from Ze'elim Gully (Dead Sea) echoes the Dead Sea level scores and suggests that drier climate conditions prevailed at ∼4300 BP and ∼3950 BP, engendering an expansion of olive horticulture during the period ∼4150–3950 BP, which implies milder conditions (Neuman et al., 2007a; Langgut et al., 2014, 2016). Pollen data from a core drilled on the Ein Gedi shore (Dead Sea) were also used to reconstruct temporal variations in rainfall (Litt et al., 2012). While the 4.2 ka BP event corresponds to a relatively wet and cool period, two slightly drier phases were also recorded at ∼4400–4300 BP and ∼3900 BP (Litt et al., 2012). Even if some issues persist, the chronology of the Dead Sea (Ze'elim and Ein Feshkha sections) was strongly improved by Kagan et al. (2010, 2011), who produced Bayesian age–depth deposition models using the OxCal P-sequence model. The refined chronology of the Ze'elim Gully sequence and the Dead Sea are described in detail in Kagan et al. (2015).

The core DS 7-1 SC (Dead Sea; Heim et al., 1997), the core from Ein Feshkha (Dead Sea; Neuman et al., 2007b), and the marine cores off the Israeli coast (Schilman et al., 2001) were not included in our analysis because they do not cover the period under consideration.

Data from the southern Levant are complex compared to those from the northern Mediterranean. While the sites suggest that drier conditions were recorded during the 4.2 ka BP event from the Mediterranean coast to the Dead Sea, they nonetheless show that drought must be integrated into a broader chronological framework disrupted by a short wetter period. This W-shaped event is attested at several sites, suggesting that the W shape is not “noise” but a regional phenomenon spanning the central-southern Levant. A W-shaped event is clearly highlighted in the Dead Sea records (Litt et al., 2012; Langgut et al., 2014, 2016; Kagan et al., 2015; see Fig. 4) as well as at Soreq Cave (δ18O, Fig. 4; Bar-Matthews et al., 2003; Bar-Matthews and Ayalon, 2011) and is more or less attested in the Sea of Galilee (Langgut et al., 2013; Schiebel and Litt, 2018), at Tel Dan, and Tel Akko (Kaniewski et al., 2013, 2017). This W-shaped event may be a local expression of the North Atlantic Bond event 3 (Bond et al., 1997) because it has already been demonstrated that drier–wetter phases in the eastern Mediterranean were associated with cooling–warming periods in the North Atlantic during the past 55 kyr (Bartov et al., 2003).

7 Climatic hypotheses to explain the 4.2 ka BP event in the Levant
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7.1 North Atlantic

Kushnir and Stein (2010) have clearly noted that variability in southern Levant precipitation is closely linked with a seesaw pressure gradient between the eastern North Atlantic and Eurasia. Furthermore, they also evoke the apparent link between Atlantic multidecadal variability (Atlantic multidecadal sea surface temperature (SST) variability) and atmospheric circulation (see Kushnir, 1994; Ziv et al. 2006; Kushnir and Stein, 2010). Slowly paced Holocene variability is generally modulated by a colder than normal North Atlantic, resulting in higher than normal precipitation in the central Levant, while a warmer than normal North Atlantic leads to lower precipitation. This suggests that (i) the North Atlantic is a key pacemaker in driving the long-term hydroclimatic variability of the Levant during the Holocene, and (ii) there is a nonlinear response to global climatic events, such as the 4.2 ka BP event, consistent with pronounced cooling in eastern Mediterranean winter SSTs and cold events in northern latitudes (Kushnir and Stein, 2010). It appears that sudden Northern Hemisphere cold episodes contrast with milder and more slowly paced Holocene variability.

7.2 A climate “seesaw” model

A bipolar southeast–southwest “climate seesaw” in the Mediterranean is one of the climatic modes that explains the spatiotemporal variability of precipitation over the basin during the winter (Kutiel et al., 1996; Xoplaki et al., 2004), in connection with a positive or negative NAO. The dipole precipitation pattern results from both local cyclogenesis and southward shifts of storm tracks from western Europe towards the Mediterranean (and vice versa). Drier conditions in the eastern Mediterranean mainly derive from high-pressure systems over Greenland and Iceland and relatively low pressure over southwestern Europe (Roberts et al., 2012), pointing to a weakening of the zonal atmospheric circulation over Europe (Guiot and Kaniewski, 2015). According to Xoplaki et al. (2004), the outcomes of such a pattern over most of the Mediterranean region result in above normal precipitation, with peak values on the western seaboard and lower values in the southeastern part of the basin. This scheme fits with the Brayshaw et al. (2011) model that displays wetter conditions over large parts of the Mediterranean basin, while the eastern Mediterranean was drier. These conclusions are supported by Guiot and Kaniewski (2015). According to Roberts et al. (2012), this mode also prevailed during the Little Ice Age, with drier conditions over the eastern Mediterranean and wetter patterns over the western Mediterranean (with an opposite scheme during the Medieval Climate Anomaly).

7.3 Cyprus lows

While a dominant NAO forcing may explain western Mediterranean aridity, the eastern Mediterranean appears to be mostly mediated by other climatic modes. In particular, precipitation variability has not been uniform due to shifts in cyclone migration tracks (northern–southern). Rainfall in the Levant mostly originates from midlatitude cyclones (Cyprus lows) during their eastward passage over the eastern Mediterranean (Enzel et al., 2003; Zangvil et al., 2003; Saaroni et al., 2010). During wet years, more intense cyclones frequently migrate over the eastern Mediterranean (and vice versa), reflecting variations in the long-term mean low pressure, with positive pressure anomalies consistent with reduced cyclonic activity near the surface. Under this scenario, the most probable cause for drought events in the Levant is the fact that the 500 hPa (upper-level anomalies) and sea-level pressure patterns were not conducive to cyclone migration over the eastern Mediterranean. Instead, their tracks were probably further to the north, potentially impacting western Turkey and Greece (Enzel et al., 2003).

8 Conclusions
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At the scale of the Levant, a climate shift is clearly documented by sediment records during the chronological frame of the 4.2 ka BP event. Nonetheless, some locations show that other regional and/or local forcing agents may be involved, yielding different outcomes that must be more closely addressed in the future. Concerning the climate mechanism driving the 4.2 ka BP event, we can assume that, despite the clear geographical dimensions of the 4.2 ka BP event (Zanchetta et al., 2016; Di Rita et al., 2018), the patterns responsible for the event are not yet fully understood. This also raises a key question: how did societies adapt to this ∼300-year (or longer) drought? This knowledge gap is still widely debated and must be addressed using high-resolution local records in proximity to archeological sites to fully understand the resilience and adaptive strategies of the Levant's diverse peoples and polities.

Data availability
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Data availability. 

Data from this paper are available upon request to the corresponding author.

Supplement
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Supplement. 

The supplement related to this article is available online at: https://doi.org/10.5194/cp-14-1529-2018-supplement.

Author contributions
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Author contributions. 

DK, NM, RC, JG, and EVC conceived the review and wrote the paper.

Competing interests
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Competing interests. 

The authors declare that they have no conflict of interest.

Special issue statement
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Special issue statement. 

This article is part of the special issue “The 4.2 ka BP climatic event”. It is a result of “The 4.2 ka BP Event: An International Workshop”, Pisa, Italy, 10–12 January 2018.

Acknowledgements
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Acknowledgements. 

Support was provided by the Institut Universitaire de France CLIMSORIENT program. This work is a contribution to Labex OT-Med (no. ANR-11-LABX-0061) and has received funding from the Excellence Initiative of Aix-Marseille University – A*MIDEX, a French “Investissements d'Avenir” project.

Edited by: Giovanni Zanchetta
Reviewed by: two anonymous referees

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Studies have long suggested that a protracted drought phase, termed the 4.2 ka BP event, directly impacted subsistence systems (dry farming agro-production, pastoral nomadism, and fishing) and outlying nomad habitats, forcing rain-fed cereal agriculturalists into habitat-tracking when agro-innovations were not available. Here, we focus on this crucial period to examine whether drought was active in the eastern Mediterranean Old World, especially in the Levant.
Studies have long suggested that a protracted drought phase, termed the 4.2 ka BP event,...
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