Articles | Volume 10, issue 2
https://doi.org/10.5194/cp-10-745-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
https://doi.org/10.5194/cp-10-745-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
the Creative Commons Attribution 3.0 License.
Research article
| 
15 Apr 2014
Research article |
| 15 Apr 2014
Hydrographic changes in the Agulhas Recirculation Region during the late Quaternary
D. K. Naik
Micropaleontology Laboratory, National Institute of Oceanography, Goa, India
R. Saraswat
Micropaleontology Laboratory, National Institute of Oceanography, Goa, India
N. Khare
Ministry of Earth Sciences, New Delhi, India
A. C. Pandey
Allahabad University, Allahabad, India
presently at: Bundelkhand University, Jhansi, India
R. Nigam
Micropaleontology Laboratory, National Institute of Oceanography, Goa, India
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Marijke W. de Bar, Dave J. Stolwijk, Jerry F. McManus, Jaap S. Sinninghe Damsté, and Stefan Schouten
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Bryan C. Lougheed, Brett Metcalfe, Ulysses S. Ninnemann, and Lukas Wacker
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Palaeoclimate reconstructions from deep-sea sediment archives provide valuable insight into past rapid climate change, but only a small proportion of the ocean is suitable for such reconstructions using the existing state of the art, i.e. the age–depth approach. We use dual radiocarbon (14C) and stable isotope analysis on single foraminifera to bypass the long-standing age–depth approach, thus facilitating past ocean chemistry reconstructions from vast, previously untapped ocean areas.
Lukas Jonkers and Michal Kučera
Clim. Past, 13, 573–586, https://doi.org/10.5194/cp-13-573-2017, https://doi.org/10.5194/cp-13-573-2017, 2017
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Planktonic foraminifera – the most important proxy carriers in palaeoceanography – adjust their seasonal and vertical habitat. They are thought to do so in a way that minimises the change in their environment, implying that proxy records based on these organisms may not capture the full amplitude of past climate change. Here we demonstrate that they indeed track a particular thermal habitat and suggest that this could lead to a 40 % underestimation of reconstructed temperature change.
Timothé Bolliet, Patrick Brockmann, Valérie Masson-Delmotte, Franck Bassinot, Valérie Daux, Dominique Genty, Amaelle Landais, Marlène Lavrieux, Elisabeth Michel, Pablo Ortega, Camille Risi, Didier M. Roche, Françoise Vimeux, and Claire Waelbroeck
Clim. Past, 12, 1693–1719, https://doi.org/10.5194/cp-12-1693-2016, https://doi.org/10.5194/cp-12-1693-2016, 2016
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This paper presents a new database of past climate proxies which aims to facilitate the distribution of data by using a user-friendly interface. Available data from the last 40 years are often fragmented, with lots of different formats, and online libraries are sometimes nonintuitive. We thus built a new dynamic web portal for data browsing, visualizing, and batch downloading of hundreds of datasets presenting a homogeneous format.
André Düsterhus, Alessio Rovere, Anders E. Carlson, Benjamin P. Horton, Volker Klemann, Lev Tarasov, Natasha L. M. Barlow, Tom Bradwell, Jorie Clark, Andrea Dutton, W. Roland Gehrels, Fiona D. Hibbert, Marc P. Hijma, Nicole Khan, Robert E. Kopp, Dorit Sivan, and Torbjörn E. Törnqvist
Clim. Past, 12, 911–921, https://doi.org/10.5194/cp-12-911-2016, https://doi.org/10.5194/cp-12-911-2016, 2016
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This review/position paper addresses problems in creating new interdisciplinary databases for palaeo-climatological sea-level and ice-sheet data and gives an overview on new advances to tackle them. The focus therein is to define and explain strategies and highlight their importance to allow further progress in these fields. It also offers important insights into the general problem of designing competitive databases which are also applicable to other communities within the palaeo-environment.
X. Shi, Y. Wu, J. Zou, Y. Liu, S. Ge, M. Zhao, J. Liu, A. Zhu, X. Meng, Z. Yao, and Y. Han
Clim. Past, 10, 1735–1750, https://doi.org/10.5194/cp-10-1735-2014, https://doi.org/10.5194/cp-10-1735-2014, 2014
S. Kasper, M. T. J. van der Meer, A. Mets, R. Zahn, J. S. Sinninghe Damsté, and S. Schouten
Clim. Past, 10, 251–260, https://doi.org/10.5194/cp-10-251-2014, https://doi.org/10.5194/cp-10-251-2014, 2014
R. J. Telford, C. Li, and M. Kucera
Clim. Past, 9, 859–870, https://doi.org/10.5194/cp-9-859-2013, https://doi.org/10.5194/cp-9-859-2013, 2013
Cited articles
Anilkumar, N., Luis, A. J., Somayajulu, Y. K., Ramesh Babu, V. M., Dash, K., Pednekar, S. M., Babu, K. N., Sudhakar, M., and Pandey, P. C.: Fronts, water masses and heat content variability in the Western Indian sector of the Southern Ocean during austral summer 2004, J. Mar. Syst., 63, 20–34, 2006.
Antonov, J. I., Seidov, D., Boyer, T. P., Locarnini, R. A., Mishonov, A. V., Garcia, H. E., Baranova, O. K., Zweng, M. M., and Johnson, D. R.: World Ocean Atlas 2009, in: Volume 2: Salinity, edited by: Levitus, S., NOAA Atlas NESDIS 69, US Government Printing Office, Washington, D.C., 184 pp., 2010.
Bader, J. and Latif, M.: The impact of decadal-scale Indian Ocean sea surface temperature anomalies on Sahelian rainfall and the North Atlantic Oscillation, Geophys. Res. Lett., 30, 2169, https://doi.org/10.1029/2003GL018426, 2003.
Bard, E. and Rickaby, R. E. M.: Migration of the subtropical front as a modulator of glacial climate, Nature, 460, 380–383, 2009.
Barker, S. and Elderfield, H.: Foraminiferal calcification response to glacial-interglacial changes in atmospheric CO2, Science, 297, 833–836, 2002.
Barker, S., Cacho, I., Benway, H., and Tachikawa, K.: Planktonic foraminiferal Mg/Ca as a proxy for past oceanic temperatures: a methodological overview and data compilation for the Last Glacial Maximum, Quaternary Sci. Rev., 24, 821–834, 2005.
Barker, S., Diz, P., Vautravers, M. J., Pike, J., Knorr, G., Hall, I. R., and Broecker, W. S.: Interhemispheric Atlantic seesaw response during the last deglaciation, Nature, 457, 1097–1102, 2009.
Bassinot, F. C., Labeyrie, L. D., Vincent, E. X. Q., Shackleton, N. J., and Lancelot, Y.: The astronomical theory of climate and the age of the Brunhes-Matuyama magnetic reversal, Earth Planet. Sc. Lett., 126, 91–108, 1994.
Bé, A. W. H. and Duplessy, J. C.: Subtropical convergence fluctuations and quaternary climates in the middle latitudes of the Indian Ocean, Science, 194, 419–422, 1976.
Bé, A. W. H. and Hutson, W. H.: Ecology of planktonic foraminifera and biogeographic patterns of life and fossil assemblages in the Indian Ocean, Micropaleontology, 23, 369–414, 1977.
Beal, L. M., De Ruijter, W. P. M., Biastoch, A., Zahn, R., and SCOR/WCRP/IAPSO Working Group: On the role of the Agulhas system in ocean circulation and climate, Nature, 472, 429–436, 2011.
Bergami, C., Capotondi, L., Langone, L., Giglio, F., and Ravaioli, M.: Distribution of living planktonic foraminifera in the Ross Sea and the Pacific sector of the Southern Ocean (Antarctica), Mar. Micropaleontol., 73, 37–48, 2009.
Berger, W. H.: Deep-Sea carbonates: dissolution profiles from foraminiferal preservation, Cushman Foundation for Foraminiferal Research Special Publication, 13, 82–86, 1975.
Brathauer, U. and Abelmann, A.: Late Quaternary variations in sea surface temperatures and their relationship to orbital forcing recorded in the Southern Ocean (Atlantic sector), Paleoceanography, 14, 135–148, 1999.
Brown, S. J. and Elderfield, H.: Variations in Mg/Ca and Sr/Ca ratios of planktonic foraminifera caused by postdepositional dissolution: evidence of a shallow Mg-dependent dissolution, Paleoceanography, 11, 543–551, 1996.
Bryden, H. L. and Beal, L. M.: Role of the Agulhas Current in Indian Ocean circulation and associated heat and freshwater fluxes, Deep-Sea Res. Pt. I, 48, 1821–1845, 2001.
Caley, T., Giraudeau, J., Malaizé, B., Rossignol, L., and Pierre, C.: Agulhas leakage as a key process in the modes of Quaternary climate changes, P. Natl. Acad. Sci., 109, 6835–6839, https://doi.org/10.1073/pnas.1115545109, 2012.
Chavaillaz, Y., Codron, F., and Kageyama, M.: Southern westerlies in LGM and future (RCP4.5) climates, Clim. Past, 9, 517–524, https://doi.org/10.5194/cp-9-517-2013, 2013.
Chave, K. E.: Aspects of the biogeochemistry of magnesium 1. Calcareous marine organisms, J. Geol., 62, 266–283, 1954.
Clemens, S. C., Prell, W. L., Murray, D., Shimmield, G., and Weedon, G.: Forcing mechanisms of the Indian Ocean monsoon, Nature, 353, 720–725, 1991.
Darling, K. F., Kucera, M., Kroon, D., and Wade, C. M.: A resolution for the coiling direction paradox in Neogloboquadrina pachyderma, Paleoceanography, 21, PA2011, https://doi.org/10.1029/2005PA001189, 2006.
De Boer, A. M., Graham, R. M., Thomas, M. D., and Kohfeld, K. E.: The control of the Southern Hemisphere Westerlies on the position of the Subtropical Front, J. Geophys. Res.-Oceans, 118, 5669–5675, https://doi.org/10.1002/jgrc.20407, 2013.
de Ruijter, W. P. M., Biastoch, A., Drijfhout, S. S., Lutjeharms, J. R. E., Matano, R. P., Pichevin, T., van Leeuwen, P. J., and Weijer, W.: Indian-Atlantic interocean exchange: dynamics, estimation and impact, J. Geophys. Res., 104, 20885–20910, 1999.
de Ruijter, W. P. M., Ridderinkhof, H., and Schouten, M. W.: Variability of the southwest Indian Ocean, Philos. T. Roy. Soc. A, 363, 63–76, 2005.
de Villiers, S.: Optimum growth conditions as opposed to calcite saturation as a control on the calcification rate and shell-weight of marine foraminifera, Mar. Biol., 144, 45–49, 2004.
Donohue, K. A. and Toole, J.: A near-synoptic survey of the Southwest Indian Ocean, Deep-Sea Res., 50, 1893–1931, 2003.
Duplessy, J. C., Labeyrie, L., Juillet-Leclerc, A., Maitre, F., Duprat, J., and Sarnthein, M.: Surface salinity reconstruction of the north Atlantic Ocean during the last glacial maximum, Oceanol. Acta, 14, 311–324, 1991.
Durgadoo, J. V., Loveday, B. R., Reason, C. J. C., Penven, P., and Biastoch, A.: Agulhas leakage predominantly responds to the Southern Hemisphere westerlies, J. Phys. Oceanogr., 43, 2113–2131, https://doi.org/10.1175/JPO-D-13-047.1, 2013.
Ericson, D. B.: Coiling direction of Globigerina pachyderma as a climatic index, Science, 130, 219–220, 1959.
Fairbanks, R. G., Sverdlove, M. S., Free, R., Wiebe, P. H., and Bé, A. W. H.: Vertical distribution and isotopic fractionation of living planktonic foraminifera from the Panama Basin, Nature, 298, 841–844, 1982.
Fine, R. A.: Direct evidence using tritium data for through?ow from the Pacific into the Indian Ocean, Nature, 315, 478–480, 1985.
Flores, J. A., Gersonde, R., and Sierro, F. J.: Pleistocene fluctuations in the Agulhas Current Retroflection based on the calcareous plankton record, Mar. Micropaleontol., 37, 1–22, 1999.
Fraile, I., Schulz, M., Mulitza, S., and Kucera, M.: Predicting the global distribution of planktonic foraminifera using a dynamic ecosystem model, Biogeosciences, 5, 891–911, https://doi.org/10.5194/bg-5-891-2008, 2008.
Fraile, I., Schulz, M., Mulitza, S., Merkel, U., Prange, M., and Paul, A.: Modeling the seasonal distribution of planktonic foraminifera during the Last Glacial Maximum, Paleoceanography, 24, PA2216, https://doi.org/10.1029/2008PA001686, 2009.
Francois, R., Bacon, M. P., Altabet, M. A., and Labeyrie, L. D.: Glacial/interglacial changes in sediment rain rate in the SW Indian Sector of subantarctic Waters as recorded by 230Th, 231Pa, U, and δ15N, Paleoceanography, 8, 611–629, https://doi.org/10.1029/93PA00784, 1993.
Friedrich, O., Schiebel, R., Wilson, P. A., Weldeab, S., Beer, C. J., Cooper, M. J., and Fiebig, J.: Influence of test size, water depth, and ecology on Mg/Ca, Sr/Ca, δ18O and 13C in nine modern species of planktic foraminifers, Earth Planet. Sc. Lett., 319–320, 133–145, 2012.
Gersonde, R., Abelmann, A., Brathauer, U., Becquey, S., Bianchi, C., Cortese, G., Grobe, H., Kuhn, G., Niebler, H. S., Segl, M., Sieger, R., Zielinski, U., and Fütterer, D. K.: Last glacial sea surface temperatures and sea-ice extent in the Southern Ocean (Atlantic-Indian sector): A multiproxy approach, Paleoceanography, 18, 6-1–6-18, 2003.
Gersonde, R., Crosta, X., Abelmann, A., and Armand, L.: Sea-surface temperature and sea ice distribution of the Southern Ocean at the epilog Last Glacial Maximum-A circum-Antarctic view based on siliceous microfossil records, Quaternary Sci. Rev., 24, 869–896, 2005.
Gordon, A. L.: Interocean exchange of thermocline water, J. Geophys. Res., 91, 5037–5046, 1986.
Graham, R. M. and De Boer, A. M.: The Dynamical Subtropical Front, J. Geophys. Res.-Oceans, 118, 5676–5685, https://doi.org/10.1002/jgrc.20408, 2013.
Gupta, A. K., Anderson, D. M., and Overpeck, J. T.: Abrupt changes in the Asian southwest monsoon during the Holocene and their links to the North Atlantic Ocean, Nature, 421, 354–357, 2003.
Hemleben, Ch., Spindler, M., and Anderson, O. R.: Modern Planktonic Foraminifera, 1st Edn., Springer-Verlag Inc., New York, 363 pp., 1989.
Hodell, D. A., Charles, C. D., and Sierro, F. J.: Late Pleistocene evolution of the ocean's carbonate system, Earth Planet. Sc. Lett., 192, 109–124, 2001.
Howard, W. R. and Prell, W. L. A.: Comparison of Radiolarian and Foraminiferal Paleoecology in the Southern Indian Ocean: New Evidence for the Interhemispheric Timing of Climatic Change, Quaternary Res., 21, 244–263, 1984.
Howard, W. R. and Prell, W. L.: Late Quaternary CaCO3 production and preservation in the Southern Ocean: Implications for oceanic and atmospheric carbon cycling, Paleoceanography, 9, 453–482, https://doi.org/10.1029/93PA03524, 1994.
Huang, C. J., Qiao, F., Shu, Q., and Song, Z.: Evaluating austral summer mixed-layer response to surface wave-induced mixing in the Southern Ocean, J. Geophys. Res., 117, C00J18, https://doi.org/10.1029/2012JC007892, 2012.
Ito, T., Parekh, P., Dutkiewicz, S., and Follows, M. J.: The Antarctic Circumpolar Productivity Belt, Geophys. Res. Lett., 32, L13604, https://doi.org/10.1029/2005GL023021, 2005.
Jaccard, S. L., Hayes, C. T., Martínez-García, A., Hodell, D. A., Anderson, R. F., Sigman, D. M., and Haug, G. H.: Two modes of change in Southern Ocean productivity over the past million years, Science, 339, 1419–1423, 2013.
Katz, A.: The interaction of magnesium with calcite during crystal growth at 25–90 °C and one atmosphere, Geochim. Cosmochim. Acta, 37, 1563–1586, 1973.
King, A. L. and Howard, W. R.: Planktonic foraminiferal flux seasonality in Subantarctic sediment traps: A test for paleoclimate reconstructions, Paleoceanography, 18, 19-1–19-17, 2003.
King, A. L. and Howard, W. R.: δ18O seasonality of planktonic foraminifera from the Southern Ocean sediment traps: Latitudinal gradients and implications for paleoclimate reconstructions, Mar. Micropal., 56, 1–24, 2005.
Knorr, G. and Lohmann, G.: Southern Ocean origin for the resumption of Atlantic thermohaline circulation during deglaciation, Nature, 424, 532–536, 2003.
Kohfeld, K. E., Graham, R. M., d. Boer, A. M., Sime, L. C., Wolff, E. W., Quéré, C. L., and Bopp, L.: Southern Hemisphere westerly wind changes during the Last Glacial Maximum: Paleo-data synthesis, Quaternary Sci. Rev., 64, 104–120, 2013.
Kuroyangi, A. and Kawahata, H.: Vertical distribution of living planktonic foraminifera in the seas around Japan, Mar. Micropaleontol., 53, 173–196, 2004.
Lea, D. W., Mashiotta, T. A., and Spero, H. J.: Controls on magnesium and strontium uptake in planktonic foraminifera determined by live culturing, Geochim. Cosmochim. Acta, 63, 2369–2379, 1999.
Le Bars, D., De Ruijter, W. P. M., and Dijkstra, H. A.: A New Regime of the Agulhas Current Retroflection: Turbulent Choking of Indian-Atlantic leakage, J. Phys. Oceanogr., 42, 1158–1172, 2012.
Lisiecki, L. E. and Raymo, M. E.: A Pliocene-Pleistocene stack of 57 globally distributed benthic δ18O records, Paleoceanography, 20, PA1003, https://doi.org/10.1029/2004PA001071, 2005.
Locarnini, R. A., Mishonov, A. V., Antonov, J. I., Boyer, T. P., Garcia, H. E., Baranova, O. K., Zweng, M. M., and Johnson, D. R.: World Ocean Atlas 2009, in: Volume 1: Temperature, edited by: Levitus, S., NOAA Atlas NESDIS 68, US Government Printing Office, Washington, D.C., 184 pp., 2010.
Lutjeharms, J. R. E. and Ansorge, I. J.: The Agulhas Return Current, J. Mar. Syst., 30, 115–138, 2001.
Lutjeharms, J. R. E. and van Ballegooyen, R. C.: The retroflection of the Agulhas Current, J. Phys. Oceanogr., 18, 1570–1583, 1988.
Marino, G., Zahn, R., Ziegler, M., Purcell, C., Knorr, G., Hall, I. R., Ziveri, P., and Elderfield, H.: Agulhas salt-leakage oscillations during abrupt climate changes of the Late Pleistocene, Paleoceanography, 28, 599–606, 2013.
Martin, P. A. and Lea, D. W.: A simple evaluation of cleaning procedures on fossil benthic foraminiferal Mg/Ca, Geochem. Geophy. Geosy., 3, 1–8, 2002.
Martínez-Méndez, G., Zahn, R., Hall, I. R., Peeters, F. J. C., Pena, L. D., Cacho, I., and Negre, C.: Contrasting multiproxy reconstructions of surface ocean hydrography in the Agulhas Corridor and implications for the Agulhas Leakage during the last 345,000 years, Paleoceanography, 25, PA4227, https://doi.org/10.1029/2009PA001879, 2010.
Mashiotta, T. A., Lea, D. W., and Spero, H. J.: Glacial–interglacial changes in Subantarctic sea surface temperature and d18O-water using foraminiferal Mg, Earth Planet. Sc. Lett., 170, 417–432, 1999.
Matano, R. P.: A numerical study of the Agulhas retroflection: The role of bottom topography, J. Phys. Oceanogr., 26, 2267–2278, 1996.
Matano, R. P., Simionatoe, C. G., de Ruijter, W. P., van Leeuween, P. J., Strub, P. T., Chelton, D. B., and Schlax, M. G.: Seasonal variability in the Agulhas Retroflection region, Geophys. Res. Lett., 25, 4361–4364, 1998.
Matano, R. P., Simionato, C. G., and Strub, P. T.: Modeling the wind-driven variability of the south Indian Ocean, J. Phys. Oceanogr., 29, 217–230, 1999.
McCorkle, D. C., Martin, P. A., Lea, D. W., and Klinkhammer, G. P.: Evidence of a dissolution effect on benthic foraminiferal shell chemistry: δ13C, Cd/Ca, Ba/Ca and Sr/Ca from the Ontong Java Plateau, Paleoceanography, 10, 699–714, 1995.
McCreary, J. P., Kohler Jr., K. E., Hood, R. R., and Olson, D. B.: A four-component ecosystem model of biological activity in the Arabian Sea, Prog. Oceanogr., 37, 193–240, 1996.
Mekik, F., Francois, R., and Soon, M.: A novel approach to dissolution correction of Mg/Ca-based paleothermometry in the tropical Pacific, Paleoceanography, 22, PA3217, https://doi.org/10.1029/2007PA001504, 2007.
Mortyn, P. G. and Charles, C. D.: Planktonic foraminiferal depth habitat and δ18O calibrations: Plankton tow results from the Atlantic sector of the Southern Ocean, Paleoceanography, 18, 15-1–15-14, https://doi.org/10.1029/2001PA000637, 2003.
Oomori, T., Kaneshima, H., and Maezato, Y.: Distribution coef?cient of Mg2+ ions between calcite and solution at 10–50 °C, Mar. Chem., 20, 327–336, 1987.
Ortiz, J. D., Mix, A. C., and Collier, R. W.: Environmental control of living symbiotic and asymbiotic foraminifera of the California Current, Paleoceanography, 10, 987–1009, 1995.
Peeters, F. J. C., Brummer, G. J. A., and Ganssen, G. M.: The effect of upwelling on the distribution and stable isotope composition of Globigerina bulloides and Globigerinoides ruber (planktic foraminifera) in modern surface waters of the NW Arabian Sea, Global Planet. Change, 34, 269–291, 2002.
Peeters, F. J. C., Acheson, R., Brummer, G. J. A., de Ruijter, W. P. M., Schneider, R. R., Ganssen, G. M., Ufkes, E., and Kroon, D.: Vigorous exchange between the Indian and Atlantic oceans at the end of the past five glacial periods, Nature, 430, 661–665, 2004.
Poulton, A. J., Stinchcombe, M. C., and Quartly, G. D.: High numbers of Trichodesmium and diazotrophic diatoms in the southwest Indian Ocean, Geophys. Res. Lett., 36, L15610, https://doi.org/10.1029/2009GL039719, 2009.
Prell, W. L. and Curry, W. B.: Faunal and isotopic indices of monsoonal upwelling: western Arabian Sea, Oceanol. Acta., 4, 91–98, 1981.
Quartly, G. D. and Srokosz, M. A.: Seasonal variations in the region of the Agulhas Retroflection: Studies with Geosat and FRAM, J. Phys. Oceanogr., 23, 2107–2124, 1993.
Quartly, G. D., Buck, J. J. H., Srokosz, M. A., and Coward, A. C.: Eddies around Madagascar: The retroflection re-considered, J. Mar. Syst., 63, 115–129, 2006.
Rau, A. J., Rogers, J., Lutjeharms, J. R. E., Giraudeau, J., Lee-Thorp, J. A., Chen, M. T., and Waelbroeck, C.: A 450-kyr record of hydrological conditions on the western Agulhas Bank slope, south of Africa, Mar. Geol., 180, 183–201, 2002.
Read, J. F. and Pollard, R. T.: Structure and transport of Antarctic circumpolar current and Agulhas Return Current at 40° E, J. Geophys. Res., 98, 12281–12295, 1993.
Regenberg, M., Nürnberg, D., Steph, S., Groeneveld, J., Garbe-Schönberg, D., Tiedemann, R., and Dullo, W. C.: Assessing the effect of dissolution on planktonic foraminiferal Mg/Ca ratios: Evidence from Caribbean core tops, Geochem. Geophy. Geosy., 7, Q07P15, https://doi.org/10.1029/2005GC001019, 2006.
Reynolds, L. A. and Thunell, R. C.: Seasonal succession of planktonic foraminifera in the subpolar North Pacific, J. Foramin. Res., 15, 282–301, 1985.
Rintoul, S. R., Hughes, C., and Olbers, D.: The Antarctic Circumpolar Current system, in: Ocean Circulation and Climate, edited by: Siedler, J. C. G. and Gould, J., Academic Press, London, 271–302, 2001.
Rosenthal, Y. and Lohmann, G. P.: Accurate estimation of sea surface temperatures using dissolution-corrected calibrations for Mg/Ca paleothermometry, Paleoceanography, 17, 16-1–16-6, https://doi.org/10.1029/2001PA000749, 2002.
Rosenthal, Y., Lohman, G. P., Lohman, K. C., and Sherrell, R. M.: Incorporation and preservation of Mg in Globigerinoides sacculifer: Implications for reconstructing the temperature and 18O/16O of seawater, Paleoceanography, 15, 135–145, 2000.
Sautter, L. R. and Thunell, R. C.: Seasonal succession of planktonic foraminifera: Results from a four-year time-series sediment trap experiment in the northeast Pacific, J. Foramin. Res., 19, 253–267, 1989.
Sautter, L. R. and Thunell, R. C.: Planktonic foraminiferal response to upwelling and seasonal hydrographic conditions: Sediment trap results from San Pedro Basin, Southern California Bight, J. Foramin. Res., 21, 347–363, 1991.
Schiebel, R., Bijma, J., and Hemleben, C.: Population dynamics of the planktic foraminifer Globigerina bulloides from the eastern North Atlantic, Deep-Sea Res. Pt. I, 44, 1701–1713, 1997.
Schott, F. A., Xie, S. P., and McCreary Jr., J. P.: Indian Ocean circulation and climate variability, Rev. Geophys., 47, RG1002, https://doi.org/10.1029/2007RG000245, 2009.
Schouten, M. W., de Ruijter, W. P. M., van Leeuwen, P. J., and Lutjeharms, J. R. E.: Translation, decay and splitting of Agulhas rings in the south-east Atlantic Ocean, J. Geophys. Res., 105, 21913–21925, 2000.
Schrag, D. P., Adkins, J. F., McIntyre, K., Alexander, J. L., Hodell, D. A., Charles, C. D., and McManus, J. F.: The oxygen isotopic composition of seawater during the Last Glacial Maximum, Quaternary Sci. Rev., 21, 331–342, 2002.
Shulmeister, J., Goodwin, I., Renwick, J., Harle, K., Armand, L., McGlone, M. S., Cook, E., Dodson, J., Hesse, P. P., Mayewski, P., and Curran, M.: The Southern Hemisphere westerlies in the Australasian sector over the last glacial cycle: A synthesis, Quatern. Int., 118/119, 23–53, 2004.
Sigman, D. M. and Boyle, E. A.: Glacial/interglacial variations in atmospheric carbon dioxide, Nature, 407, 859–869, 2000.
Sime, L. C., Kohfeld, K. E., Le Quéré, C., Wolff, E. W., de Boer, A. M., Graham, R. M., and Bopp, L.: Southern Hemisphere westerly wind changes during the Last Glacial Maximum: model-data comparison, Quaternary Sci. Rev., 64, 104–120, 2013.
Simon, M. H., Arthur, K. L., Hall, I. R., Peeters, F. J. C., Loveday, B. R., Barker, S., Ziegler, M., and Zahn, R.: Millennial-scale Agulhas Current variability and its implications for salt-leakage through the Indian–Atlantic Ocean Gateway, Earth Planet. Sc. Lett., 383, 101–112, 2013.
Stramma, L.: The South Indian Ocean Current, J. Phys. Oceanogr., 22, 421–430, 1992.
Stramma, L. and Lutjeharms, J. R. E.: The flow of the subtropical gyre of the South Indian Ocean, J. Geophys. Res., 102, 5513–5530, 1997.
Talley, L. D.: Closure of the global overturning circulation through the Indian, Pacific, and Southern Oceans: Schematics and transports, Oceanography 26, 80–97, https://doi.org/10.5670/oceanog.2013.07, 2013.
Thunell, R. C. and Reynolds, L.: Sedimentation of planktonic foraminifera: Seasonal changes in species flux in the Panama Basin, Micropaleontology, 30, 241–260, 1984.
Toggweiler, J. R., Russell, J. L., and Carson, S. R.: Midlatitude westerlies, atmospheric CO2, and climate change during the ice ages, Paleoceanography, 21, PA2005, https://doi.org/10.1029/2005PA001154, 2006.
Tomczak, M. and Godfrey, J. S.: Regional Oceanography: An Introduction, Pergamon, New York, p. 390, 2003.
van Aken, H. M., Lutjeharms, J. R. E., Rouault, M., Whittle, C., and de Ruijter, W. P. M.: Observations of an early Agulhas Current Retroflection event in 2001: a temporary cessation of inter-ocean exchange south of Africa?, Deep-Sea Res. Pt. I, 72, 1–8, 2013.
Wyrtki, K.: Oceanographic Atlas of the International Indian Ocean Expedition, National Science Foundation, Washington, D.C., 531 pp., 1971.
Žarić, S., Schulz, M., and Mulitza, S.: Global prediction of planktic foraminiferal fluxes from hydrographic and productivity data, Biogeosciences, 3, 187–207, https://doi.org/10.5194/bg-3-187-2006, 2006.
