A GCM comparison of Pleistocene super-interglacial periods in relation to Lake El'gygytgyn, NE Arctic Russia
Summary: Evidence from Pleistocene sediments suggest that the Arctic's climate went through multiple sudden transitions, warming by 2-4 °C (compared to preindustrial times), and stayed warm for hundreds to thousands of years. A climate modelling study of these events suggests that the Arctic's climate and landscape drastically changed, transforming a cold and barren landscape as we know today to a warm, lush, evergreen and boreal forest landscape only seen in the modern midlatitudes.
Clim. Past, 11, 979-989, doi:10.5194/cp-11-979-2015, 2015
Implementation of counted layers for coherent ice core chronology
Clim. Past, 11, 959-978, doi:10.5194/cp-11-959-2015, 2015
Reconciling reconstructed and simulated features of the winter Pacific/North American pattern in the early 19th century
Summary: A discrepancy exists between reconstructed and simulated Pacific North American pattern (PNA) features during the early 19th century. Pseudo-reconstructions demonstrate that the available PNA reconstruction is potentially skillful but also potentially affected by a number of sources of uncertainty and deficiencies especially at multidecadal and centennial timescales. Simulations and reconstructions can be reconciled by attributing the reconstructed PNA features to internal variability.
Clim. Past, 11, 939-958, doi:10.5194/cp-11-939-2015, 2015
A tropical speleothem record of glacial inception, the South American Summer Monsoon from 125 to 115 ka
Clim. Past, 11, 931-938, doi:10.5194/cp-11-931-2015, 2015
Thermal evolution of the western South Atlantic and the adjacent continent during Termination 1
Summary: Here we show that temperatures in the western South Atlantic increased markedly during the major slowdown event of the Atlantic meridional overturning circulation (AMOC) of the last deglaciation. Over the adjacent continent, however, temperatures followed the rise in atmospheric carbon dioxide, lagging changes in oceanic temperature. Our records corroborate the notion that the long duration of the major slowdown event of the AMOC was fundamental in driving the Earth out of the last glacial.
Clim. Past, 11, 915-929, doi:10.5194/cp-11-915-2015, 2015
Technical Note: How accurate can stalagmite formation temperatures be determined using vapour bubble radius measurements in fluid inclusions?
Summary: Fluid inclusions inside stalagmites retain information on the cave temperature at the time they formed and thus can be used to reconstruct the continental climate of the past. A method for extracting this information based on a thermodynamic model and size measurements of femtosecond-laser-induced vapour bubbles is presented. Applying our method to stalagmites taken from the Milandre cave in the Swiss Jura Mountains demonstrate that palaeotemperatures can be determined with an accuracy of ±1°C.
Clim. Past, 11, 905-913, doi:10.5194/cp-11-905-2015, 2015
Twelve thousand years of dust: the Holocene global dust cycle constrained by natural archives
Summary: We propose an innovative framework to organize paleodust records, formalized in a publicly accessible database, and discuss the emerging properties of the global dust cycle during the Holocene by integrating our analysis with simulations performed with the Community Earth System Model. We show how the size distribution of dust is intrinsically related to the dust mass accumulation rates and that only considering a consistent size range allows for a consistent analysis of the global dust cycle.
Clim. Past, 11, 869-903, doi:10.5194/cp-11-869-2015, 2015
Eastern Mediterranean Sea circulation inferred from the conditions of S1 sapropel deposition
Clim. Past, 11, 855-867, doi:10.5194/cp-11-855-2015, 2015
Effects of past climate variability on fire and vegetation in the cerrãdo savanna of the Huanchaca Mesetta, NE Bolivia
Summary: A 14,500-year, high-resolution, sedimentary record from Huanchaca Mesetta, a palm swamp located in the cerrãdo savanna in northeastern Bolivia, was analyzed for phytoliths, stable isotopes and charcoal. A non-analogue, cold-adapted vegetation community dominated the Late Glacial-Early Holocene period (14.5-9ka), which included trees and C3 Pooideae and C4 Panicoideae grasses. The Late Glacial vegetation was fire sensitive and fire activity during this period was low, likely responding to fuel av
Clim. Past, 11, 835-853, doi:10.5194/cp-11-835-2015, 2015
New insights into the reconstructed temperature in Portugal over the last 400 years
Clim. Past, 11, 825-834, doi:10.5194/cp-11-825-2015, 2015
Bottom water variability in the subtropical northwestern Pacific from 26 kyr BP to present based on Mg / Ca and stable carbon and oxygen isotopes of benthic foraminifera
Clim. Past, 11, 803-824, doi:10.5194/cp-11-803-2015, 2015
A 500-year seasonally resolved δ18O and δ13C, layer thickness and calcite aspect record from a speleothem deposited in the Han-sur-Lesse cave, Belgium
Clim. Past, 11, 789-802, doi:10.5194/cp-11-789-2015, 2015
Controls on fire activity over the Holocene
Clim. Past, 11, 781-788, doi:10.5194/cp-11-781-2015, 2015
Modelling of mineral dust for interglacial and glacial climate conditions with a focus on Antarctica
Clim. Past, 11, 765-779, doi:10.5194/cp-11-765-2015, 2015
Northern Hemisphere control of deglacial vegetation changes in the Rufiji uplands (Tanzania)
Summary: This study has great paleoclimatic and paleoecological significance, as it deals with the poorly documented tropical SE African ecosystem during the last deglaciation. Changes in the Rufiji upland vegetation evidenced the response of the regional hydrologic system to high-latitude climatic fluctuations associated with ITCZ shifts, while changes in sensitive tropical salt marshes and mangrove communities in the Rufiji lowland evidenced the impact of sea level changes on the intertidal ecosystem.
Clim. Past, 11, 751-764, doi:10.5194/cp-11-751-2015, 2015
Sea level trends in Southeast Asian seas
Summary: The Southeast Asian sea regional sea level trends are some of the highest observed in the modern satellite altimeter record that now spans almost 2 decades. Here, we examine the 20-year trends in the region over the last 60 years using a sea level reconstruction, demonstrating that a significant portion of the trend variability in the region is related to natural climate variability, specifically to the Pacific Decadal Oscillation.
Clim. Past, 11, 743-750, doi:10.5194/cp-11-743-2015, 2015
Non-linear regime shifts in Holocene Asian monsoon variability: potential impacts on cultural change and migratory patterns
Summary: Paleoclimate records from cave deposits allow the reconstruction of Holocene dynamics of the Asian monsoon system, an important tipping element in Earth's climate. Employing recently developed techniques of nonlinear time series analysis reveals several robust and continental-scale regime shifts in the complexity of monsoonal variability. These regime shifts might have played an important role as drivers of migration, cultural change, and societal collapse during the past 10,000 years.
Clim. Past, 11, 709-741, doi:10.5194/cp-11-709-2015, 2015
A 2000-year annual record of snow accumulation rates for Law Dome, East Antarctica
Summary: The Law Dome, East Antarctica snow accumulation record is extended back to 22 BCE using a power-law vertical strain rate model. The periods of 380-442, 727-783 and 1970-2009 CE show above-average snow accumulation rates, while 663-704, 933-975 and 1429-1468 CE were below average. The calculated snow accumulation rates show good correlation with atmospheric reanalysis estimates and significant spatial correlation over a wide expanse of East Antarctica.
Clim. Past, 11, 697-707, doi:10.5194/cp-11-697-2015, 2015
Subsurface North Atlantic warming as a trigger of rapid cooling events: evidence from the early Pleistocene (MIS 31–19)
Summary: This manuscript presents new Mg/Ca and previously published δ18O measurements of Neogloboquadrina pachyderma sinistral for MIS 31-19, from a sediment core from the subpolar North Atlantic. The mechanism proposed here involves northward subsurface transport of warm and salty subtropical waters during periods of weaker AMOC, leading to ice-sheet instability and IRD discharge. This is the first time that these rapid climate oscillations are described for the early Pleistocene.
Clim. Past, 11, 687-696, doi:10.5194/cp-11-687-2015, 2015
Carbon isotope (δ13C) excursions suggest times of major methane release during the last 14 kyr in Fram Strait, the deep-water gateway to the Arctic
Summary: A sediment core collected from a pockmark field on the Vestnesa Ridge (~80N) in the Fram Strait is presented. Our results show an undisturbed sedimentary record for the last 14 ka BP and negative carbon isotope excursions (CIEs) during the Bølling-Allerød interstadials and during the early Holocene. Both CIEs relate to periods of ocean warming, sea-level rise and increased concentrations of methane (CH4) in the atmosphere, suggesting an apparent correlation with warm climatic events.
Clim. Past, 11, 669-685, doi:10.5194/cp-11-669-2015, 2015