Professor Stephen Barker

2022

• Sun, Y., Knorr, G., Zhang, X., Tarasov, L., Barker, S., Werner, M. and Lohmann, G. 2022. Ice sheet decline and rising atmospheric CO2 control AMOC sensitivity to deglacial meltwater discharge. Global and Planetary Change 210, article number: 103755. (10.1016/j.gloplacha.2022.103755)

2021

• Knorr, G. et al. 2021. A salty deep ocean as a prerequisite for glacial termination. Nature Geoscience 14(12), pp. 930–936. (10.1038/s41561-021-00857-3)
• Zhang, X. et al. 2021. Direct astronomical influence on abrupt climate variability. Nature Geoscience 14, pp. 819–826. (10.1038/s41561-021-00846-6)
• van der Lubbe, H. J. L. et al. 2021. Indo-Pacific Walker circulation drove Pleistocene African aridification. Nature 598(7882), pp. 618-623. (10.1038/s41586-021-03896-3)
• Cartagena-Sierra, A. et al. 2021. Latitudinal migrations of the subtropical front at the Agulhas Plateau through the mid-Pleistocene Transition. Paleoceanography and Paleoclimatology 36(7), article number: e2020PA004084. (10.1029/2020PA004084)
• Doughty, A. M., Kaplan, M. R., Peltier, C. and Barker, S. 2021. A maximum in global glacier extent during MIS 4. Quaternary Science Reviews 261, article number: 106948. (10.1016/j.quascirev.2021.106948)
• Barker, S., Zhang, X., Jonkers, L., Lordsmith, S., Conn, S. and Knorr, G. 2021. Strengthening Atlantic inflow across the mid-pleistocene transition. Paleoceanography and Paleoclimatology 36(4), article number: e2020PA004200. (10.1029/2020PA004200)
• Barker, S. and Knorr, G. 2021. Millennial scale feedbacks determine the shape and rapidity of glacial termination. Nature Communications 12, article number: 2273. (10.1038/s41467-021-22388-6)
• Starr, A. et al. 2021. Antarctic icebergs reorganise ocean circulation during pleistocene glacials. Nature 589, pp. 236-241. (10.1038/s41586-020-03094-7)

2020

• Simon, M. H., Ziegler, M., Barker, S., van der Meer, M. T. J., Schouten, S. and Hall, I. R. 2020. A late Pleistocene dataset of Agulhas Current variability. Scientific Data 7(1), article number: 385. (10.1038/s41597-020-00689-7)
• Just, J. et al. 2020. Data report: evaluation of shipboard magnetostratigraphy by alternating field demagnetization of discrete samples, Expedition 361, Site U1475. Proceedings of the International Ocean Discovery Program 361 (10.14379/iodp.proc.361.202.2020)
• Babin, D. P. et al. 2020. Data report: X-ray fluorescence core scanning of IODP Site U1474 sediments, Natal Valley, southwest Indian Ocean, Expedition 361. 361 (10.14379/iodp.proc.361.201.2020)

2019

• Barker, S., Knorr, G., Conn, S., Lordsmith, S., Newman, D. and Thornalley, D. 2019. Early interglacial legacy of deglacial climate instability. Paleoceanography and Paleoclimatology 34(8), pp. 1455-1475. (10.1029/2019PA003661)
• Wilson, J. D., Barker, S., Edwards, N. R., Holden, P. B. and Ridgwell, A. 2019. Sensitivity of atmospheric CO2 to regional variability in particulate organic matter remineralization depths. Biogeosciences 16(14), pp. 2923-2936. (10.5194/bg-16-2923-2019)
• Menking, J. A. et al. 2019. Spatial pattern of accumulation at Taylor Dome during the last glacial inception: stratigraphic constraints from Taylor Glacier. Climate of the Past Discussions 15, pp. 1537-1556. (10.5194/cp-2018-53)
• Menking, J. A. et al. 2019. Spatial pattern of accumulation at Taylor Dome during Marine Isotope Stage 4: stratigraphic constraints from Taylor Glacier. Climate of the Past 15(4), pp. 1537-1556. (10.5194/cp-15-1537-2019)
• Wilson, J. D., Barker, S., Edwards, N. R., Holden, P. B. and Ridgwell, A. 2019. Sensitivity of atmospheric CO2 to regional variability in particulate organic matter re-mineralization depths. Biogeosciences Discussions 16, pp. 2923-2936. (10.5194/bg-16-2923-2019)
• Barker, S. 2019. A tribute to Wally Broecker. Eos, Transactions American Geophysical Union 100 (10.1029/2019EO121001)

2018

• Boscolo-Galazzo, F., Crichton, K. A., Barker, S. and Pearson, P. N. 2018. Temperature dependency of metabolic rates in the upper ocean: A positive feedback to global climate change?. Global and Planetary Change 170, pp. 201-212. (10.1016/j.gloplacha.2018.08.017)
• Tangunan, D. N. et al. 2018. The last 1 million years of the extinct genus Discoaster: Plio–Pleistocene environment and productivity at Site U1476 (Mozambique Channel). Palaeogeography, Palaeoclimatology, Palaeoecology 505, pp. 187-197. (10.1016/j.palaeo.2018.05.043)
• Hodell, D., Greaves, M., McCave, I. and Barker, S. 2018. Chemistry of oceans past and present: a special issue in tribute to Harry Elderfield, FRS (1943-2016). Geochimica et Cosmochimica Acta 236, pp. 1-4. (10.1016/j.gca.2018.06.001)
• Köhler, P. et al. 2018. The effect of obliquity-driven changes on paleoclimate sensitivity during the late Pleistocene. Geophysical Research Letters 45(13), pp. 6661-6671. (10.1029/2018GL077717)
• Pedro, J. B., Jochum, M., Buizert, C., He, F., Barker, S. and Rasmussen, S. O. 2018. Beyond the bipolar seesaw: toward a process understanding of interhemispheric coupling. Quaternary Science Reviews 192, pp. 27-46. (10.1016/j.quascirev.2018.05.005)

2017

• Hasenclever, J. et al. 2017. Sea level fall during glaciation stabilized atmospheric CO2 by enhanced volcanic degassing. Nature Communications 8, article number: 15867. (10.1038/ncomms15867)
• Zhang, X., Knorr, G., Lohmann, G. and Barker, S. 2017. Abrupt North Atlantic circulation changes in response to gradual CO2 forcing in a glacial climate state. Nature Geoscience 10, pp. 518-523. (10.1038/ngeo2974)
• Deaney, E. L., Barker, S. and Van de Flierdt, T. 2017. Timing and nature of AMOC recovery across Termination 2 and magnitude of deglacial CO2 change. Nature Communications 8, article number: 14595. (10.1038/NCOMMS14595)

2016

• Barker, S. and Knorr, G. 2016. A paleo-perspective on the AMOC as a tipping element. PAGES Magazine 24(1), pp. 14-15.
• Diz, P. and Barker, S. 2016. Approaches and constraints to the reconstruction of palaeoproductivity from Cape Basin abyssal benthic foraminifera (South Atlantic). Journal of Micropalaeontology 35, pp. 195-204. (10.1144/jmpaleo2015-045)
• Yu, J. et al. 2016. Sequestration of carbon in the deep Atlantic during the last glaciation. Nature Geoscience 9(4), pp. 319-324. (10.1038/ngeo2657)
• Hoogakker, B. A. A., Thornalley, D. J. R. and Barker, S. 2016. Millennial changes in North Atlantic oxygen concentrations. Biogeosciences Discussions 12(15), pp. 12947-12973. (10.5194/bgd-12-12947-2015)
• Hoogakker, B. A. A., Thornalley, D. J. R. and Barker, S. 2016. Millennial changes in North Atlantic oxygen concentrations. Biogeosciences 13(1), pp. 211-221. (10.5194/bg-13-211-2016)
• Barker, S. 2016. Dissolution of deep-sea carbonates. In: Elias, S. A. ed. Reference Module in Earth Systems and Environmental Sciences. Elsevier, (10.1016/B978-0-12-409548-9.09717-7)

2015

• Simon, M. H., Ziegler, M., Bosmans, J., Barker, S., Reason, C. J. and Hall, I. R. 2015. Eastern South African hydroclimate over the past 270,000 years. Scientific Reports 5, pp. 18153. (10.1038/srep18153)
• Simon, M. H. et al. 2015. Salt exchange in the Indian-Atlantic Ocean Gateway since the LGM: A compensating effect between Agulhas Current changes and salinity variations?. Paleoceanography 30(10) (10.1002/2015PA002842)
• Jonkers, L., Barker, S., Hall, I. R. and Prins, M. 2015. Correcting for the influence of ice-rafted detritus on grain size-based paleocurrent speed estimates. Paleoceanography 30(10), pp. 1347-1357. (10.1002/2015PA002830)
• Wilson, J. D., Ridgwell, A. and Barker, S. 2015. Can organic matter flux profiles be diagnosed using remineralisation rates derived from observed tracers and modelled ocean transport rates?. Biogeosciences Discussions 12(6), pp. 4557-4593. (10.5194/bgd-12-4557-2015)
• Wilson, J. D., Ridgwell, A. and Barker, S. 2015. Can organic matter flux profiles be diagnosed using remineralisation rates derived from observed tracers and modelled ocean transport rates?. Biogeosciences 12(18), pp. 5547-5562. (10.5194/bg-12-5547-2015)
• Moffa-Sanchez, P., Hall, I. R., Thornalley, D. J., Barker, S. and Stewart, C. 2015. Changes in the strength of the Nordic Seas Overflows over the past 3000 years. Quaternary Science Reviews 123, pp. 134-143. (10.1016/j.quascirev.2015.06.007)
• Thornalley, D. J. R. et al. 2015. A warm and poorly ventilated deep Arctic Mediterranean during the last glacial period. Science 349(6249), pp. 706-710. (10.1126/science.aaa9554)
• Diz, P. and Barker, S. 2015. Linkages between rapid climate variability and deep-sea benthic foraminifera in the deep Subantarctic South Atlantic during the last 95 kyr. Paleoceanography 30(6), pp. 601-611. (10.1002/2015PA002784)
• Barker, S., Chen, J., Gong, X., Jonkers, L., Knorr, G. and Thornalley, D. 2015. Icebergs not the trigger for North Atlantic cold events. Nature 520(7547), pp. 333-336. (10.1038/nature14330)
• Schaefer, J. M. et al. 2015. The Southern Glacial Maximum 65,000 years ago and its unfinished termination. Quaternary Science Reviews 114, pp. 52-60. (10.1016/j.quascirev.2015.02.009)

2014

• Anderson, R. F. et al. 2014. Biological response to millennial variability of dust and nutrient supply in the Subantarctic South Atlantic Ocean. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 372(2019), article number: 20130054. (10.1098/rsta.2013.0054)
• Barker, S. and Diz, P. 2014. Timing of the descent into the last ice age determined by the bipolar seesaw. Paleoceanography 29(6), pp. 489-507. (10.1002/2014PA002623)
• Moffa Sanchez, P., Born, A., Hall, I. R., Thornalley, D. J. and Barker, S. 2014. Solar forcing of North Atlantic surface temperature and salinity over the past millennium. Nature Geoscience 7, pp. 275-278. (10.1038/ngeo2094)
• Moffa Sanchez, P., Hall, I. R., Barker, S., Thornalley, D. J. R. and Yashayaev, I. 2014. Surface changes in the Eastern Labrador Sea around the onset of the Little Ice Age. Paleoceanography and Paleoclimatology 29(3), pp. 160-175. (10.1002/2013PA002523)

2013

• Simon, M. H. et al. 2013. Millennial-scale Agulhas Current variability and its implications for salt-leakage through the Indian-Atlantic Ocean gateway. Earth and Planetary Science Letters 383, pp. 101-112. (10.1016/j.epsl.2013.09.035)
• Skinner, L. C., Scrivner, A. E., Vance, D., Barker, S., Fallon, S. and Waelbroeck, C. 2013. North Atlantic versus Southern Ocean contributions to a deglacial surge in deep ocean ventilation. Geology 41(6), pp. 667-670. (10.1130/G34133.1)
• Thornalley, D. J. R., Barker, S., Becker, J., Hall, I. R. and Knorr, G. 2013. Abrupt changes in deep Atlantic circulation during the transition to full glacial conditions. Paleoceanography 28(2), pp. 253-262. (10.1002/palo.20025)
• Griffiths, J. D., Barker, S., Hendry, K. R., Thornalley, D. J. R., van de Flierdt, T., Hall, I. R. and Anderson, R. F. 2013. Evidence of silicic acid leakage to the tropical Atlantic via Antarctic intermediate water during marine isotope stage 4. Paleoceanography 28(2), pp. 307-318. (10.1002/palo.20030)
• Ziegler, M., Simon, M. H., Hall, I. R., Barker, S., Stringer, C. and Zahn, R. 2013. Development of Middle Stone Age innovation linked to rapid climate change. Nature Communications 4, article number: 1905. (10.1038/ncomms2897)

2012

• Sexton, P. F. and Barker, S. 2012. Onset of 'Pacific-style' deep-sea sedimentary carbonate cycles at the mid-Pleistocene transition. Earth and Planetary Science Letters 321-22, pp. 81-94. (10.1016/j.epsl.2011.12.043)
• Honisch, B. et al. 2012. The Geological Record of Ocean Acidification. Science 335(6072), pp. 1058-1063. (10.1126/science.1208277)
• Parrenin, F. et al. 2012. On the gas-ice depth difference (Δdepth) along the EPICA Dome C ice core. Climate of the Past Discussions 8(2), pp. 1089-1131. (10.5194/cpd-8-1089-2012)
• Barker, S. and Ridgwell, A. 2012. Ocean Acidification. Nature Education Knowledge 3(10), article number: 21.
• Wilson, J. D., Barker, S. and Ridgwell, A. 2012. Assessment of the spatial variability in particulate organic matter and mineral sinking fluxes in the ocean interior: Implications for the ballast hypothesis. Global Biogeochemical Cycles 26(4), article number: GB4011. (10.1029/2012GB004398)
• Parrenin, F. et al. 2012. On the gas-ice depth difference (Δdepth) along the EPICA Dome C ice core. Climate of the Past 8(4), pp. 1239-1255. (10.5194/cp-8-1239-2012)

2011

• Barker, S. et al. 2011. 800,000 years of abrupt climate variability. Science 334(6054), pp. 347-351. (10.1126/science.1203580)
• Thornalley, D. J. R., Barker, S., Broecker, W. S., Elderfield, H. and McCave, I. N. 2011. The deglacial evolution of North Atlantic deep convection. Science 331(6014), pp. 202-205. (10.1126/science.1196812)

2010

• Barker, S., Knorr, G., Vautravers, M. J., Diz Ferreiro, P. and Skinner, L. C. 2010. Extreme deepening of the Atlantic overturning circulation during deglaciation. Nature Geoscience 3(8), pp. 567-571. (10.1038/NGEO921)
• Skinner, L. C., Fallon, S., Waelbroeck, C., Michel, E. and Barker, S. 2010. Ventilation of the deep Southern Ocean and deglacial CO2 rise. Science 328(5982), pp. 1147-1151. (10.1126/science.1183627)
• Hall, I. R., Boessenkool, K. P., Barker, S., McCave, I. N. and Elderfield, H. 2010. Surface and deep ocean coupling in the subpolar North Atlantic during the last 230 years. Paleoceanography 25(2), article number: PA2101. (10.1029/2009PA001886)
• Elderfield, H. et al. 2010. A record of bottom water temperature and seawater δ18O for the Southern Ocean over the past 440 kyr based on Mg/Ca of benthic foraminiferal Uvigerina spp. Quaternary Science Reviews 29(1-2), pp. 160-169. (10.1016/j.quascirev.2009.07.013)
• Johnstone, H. J. H., Schulz, M., Barker, S. and Elderfield, H. 2010. Inside story: An X-ray computed tomography method for assessing dissolution in the tests of planktonic foraminifera. Marine Micropaleontology 77(1-2), pp. 58-70. (10.1016/j.marmicro.2010.07.004)

2009

• Barker, S., Diz Ferreiro, P., Van De Flierdt, T., Vautravers, M. J., Hall, I. R., Broecker, W. S. and Knorr, G. 2009. Enhanced Atlantic Merdional Overturning Circulation during pronounced interstadials. Geochimica Et Cosmochimica Acta 73(13s), pp. A90-A90. (10.1016/j.gca.2009.05.002)
• Barker, S., Diz Ferreiro, P., Vautravers, M. J., Pike, J., Knorr, G., Hall, I. R. and Broecker, W. S. 2009. Interhemispheric Atlantic seesaw response during the last deglaciation. Nature 457(7233), pp. 1097-1102. (10.1038/nature07770)
• Waelbroeck, C. et al. 2009. Constraints on the magnitude and patterns of ocean cooling at the Last Glacial Maximum. Nature Geoscience 2(2), pp. 127-132. (10.1038/ngeo411)

2008

• Broecker, W., Clark, E. and Barker, S. 2008. Near constancy of the Pacific Ocean surface to mid-depth radiocarbon-age difference over the last 20 kyr. Earth and Planetary Science Letters 274(3-4), pp. 322-326. (10.1016/j.epsl.2008.07.035)
• Barker, S., Broecker, W. S. and Clark, E. 2008. A search for the glacial age C-14 depleted ocean reservoir. Geochimica Et Cosmochimica Acta 72(12s), pp. A55-A55. (10.1016/j.gca.2008.05.005)

2007

• Barker, S. and Knorr, G. 2007. Antarctic climate signature in the Greenland ice core record. Proceedings of the National Academy of Sciences 104(44), pp. 17278-17282. (10.1073/pnas.0708494104)
• Broecker, W., Clark, E., Barker, S., Hajdas, I., Bonani, G. and Moreno, E. 2007. Radiocarbon age of late glacial deep water from the equatorial Pacific. Paleoceanography 22(2), article number: PA2206. (10.1029/2006PA001359)
• Barker, S., Broecker, W., Clark, E. and Hajdas, I. 2007. Radiocarbon age offsets of foraminifera resulting from differential dissolution and fragmentation within the sedimentary bioturbated zone. Paleoceanography 22(2), article number: PA2205. (10.1029/2006PA001354)
• Broecker, W. S. and Barker, S. 2007. Reply to comment by L. D. Stott on "Anomalous radiocarbon ages for foraminifera shells": A correction to the western tropical Pacific MD9821-81 record. Paleoceanography 22(1), article number: PA1212. (10.1029/2006PA001393)
• Rickaby, R. E. M. et al. 2007. Coccolith chemistry reveals secular variations in the global ocean carbon cycle?. Earth and Planetary Science Letters 253(1-2), pp. 83-95. (10.1016/j.epsl.2006.10.016)
• Broecker, W. and Barker, S. 2007. A 190‰ drop in atmosphere's Δ14C during the “Mystery Interval” (17.5 to 14.5 kyr). Earth and Planetary Science Letters 256(1-2), pp. 90-99. (10.1016/j.epsl.2007.01.015)
• Schiebel, R., Barker, S., Lendt, R., Thomas, H. and Bollmann, J. 2007. Planktic foraminiferal dissolution in the twilight zone. Deep-Sea Research. Part II.Topical studies in oceanography 54(5-7), pp. 676-686. (10.1016/j.dsr2.2007.01.009)

2006

• Barker, S., Archer, D., Booth, L., Elderfield, H., Henderiks, J. and Rickaby, R. E. 2006. Globally increased pelagic carbonate production during the Mid-Brunhes dissolution interval and the CO2 paradox of MIS 11. Quaternary Science Reviews 25(23-24), pp. 3278-3293. (10.1016/j.quascirev.2006.07.018)
• Broecker, W., Barker, S., Clark, E., Hajdas, I. and Bonani, G. 2006. Anomalous radiocarbon ages for foraminifera shells. Paleoceanography 21, article number: PA2008. (10.1029/2005PA001212)

2005

• Barker, S. 2005. The ‘flickering switch’ of late Pleistocene climate change revisited. Geophysical Research Letters 32(24), article number: L24703. (10.1029/2005GL024486)
• Barker, S., Cacho, I., Benway, H. and Tachikawa, K. 2005. Planktonic foraminiferal Mg/Ca as a proxy for past oceanic temperatures: a methodological overview and data compilation for the Last Glacial Maximum. Quaternary Science Reviews 24(7-9), pp. 821-834. (10.1016/j.quascirev.2004.07.016)
• Greaves, M., Barker, S., Daunt, C. and Elderfield, H. 2005. Accuracy, standardization, and interlaboratory calibration standards for foraminiferal Mg/Ca thermometry. Geochemistry Geophysics Geosystems 6(2), article number: Q02D13. (10.1029/2004GC000790)

2004

• Broecker, W., Barker, S., Clark, E., Hajdas, I., Bonani, G. and Stott, L. 2004. Ventilation of the Glacial deep Pacific Ocean. Science 306(5699), pp. 1169-1172. (10.1126/science.1102293)
• Rosenthal, Y. et al. 2004. Interlaboratory comparison study of Mg/Ca and Sr/Ca measurements in planktonic foraminifera for paleoceanographic research. Geochemistry Geophysics Geosystems 5(4), article number: Q04D09. (10.1029/2003GC000650)
• Barker, S., Kiefer, T. and Elderfield, H. 2004. Temporal changes in North Atlantic circulation constrained by planktonic foraminiferal shell weights. Paleoceanography 19(3), article number: PA3008. (10.1029/2004PA001004)

2003

• Barker, S., Greaves, M. and Elderfield, H. 2003. A study of cleaning procedures used for foraminiferal Mg/Ca paleothermometry. Geochemistry Geophysics Geosystems 4(9), pp. 1-20. (10.1029/2003GC000559)
• Barker, S., Higgins, J. A. and Elderfield, H. 2003. The future of the carbon cycle: review, calcification response, ballast and feedback on atmospheric CO2. Philosophical Transactions of the Royal Society of London Series A: Mathematical and Physical Sciences 361(1810), pp. 1977-1999. (10.1098/rsta.2003.1238)

2002

• Barker, S. and Elderfield, H. 2002. Foraminiferal calcification response to glacial-interglacial changes in atmospheric CO2. Science 297(5582), pp. 833-836. (10.1126/science.1072815)