Strengthening Atlantic Inflow Across the Mid- Pleistocene Transition

Stephen Barker; Xu Zhang; Lukas JonkersSian LordsmithStephen ConnGregor Knorr

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Strengthening Atlantic Inflow Across the Mid- Pleistocene Transition

机译：Strengthening Atlantic Inflow Across the Mid- Pleistocene Transition

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The development of larger and longer lasting northern hemisphere ice sheets during the mid-Pleistocene Transition (MPT) coincided with global cooling.Here,we show that surface waters of the north-eastern Atlantic actually warmed across this interval (~1.2-0.8 Ma),which we argue reflects an increase in the north-eastward transport of heat and moisture via the North Atlantic Current (NAC) into the Nordic Seas (the Atlantic Inflow).We suggest that simultaneous cooling and warming along the northwestern and south-eastern margins (respectively) of the NAC during Marine Isotope Stage 28 (~995 ka) reflected the increasing persistence of northern ice sheets as Atlantic Inflow increased.This resulted in a diachronous shift from ~40 to ~100 kyr cyclicity across the North East (NE) Atlantic as the growing influence of northern ice sheets spread southwards;to the north-west of the NAC the first "100 kyr" cycle preceded Termination 12 (~960 ka),while on the south-eastern margin of the NAC the transition occurred ~100 kyr later.Exploratory climate model simulations suggest that increasing Atlantic Inflow at this time could have accelerated ice sheet growth because pre-existing moderately sized ice sheets allowed the positive effect of increasing precipitation to outpace melting.In addition,we propose that the dependence of post-MPT ice sheets on moisture transport via the Atlantic Inflow may ultimately contribute to their apparent vulnerability to insolation forcing once a critical size threshold is crossed and high latitude ice sheets become starved of a vital moisture source.

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《Paleoceanography》 |2021年第4期|e2020PA004200-1-e2020PA004200-23|共23页
作者
Stephen Barker; Xu Zhang; Lukas JonkersSian LordsmithStephen ConnGregor Knorr;
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作者单位

School of Earth and Environmental Sciences,Cardiff University,Cardiff,UK;

Key Laboratory of Western China's Environmental Systems(Ministry of Education),College of Earth and Environmental Science,Lanzhou University,Lanzhou,China;

MARUM-Center for Marine Environmental Sciences,University of Bremen,Bremen,GermanyAlfred Wegener Institute,Helmholtz Center for Polar and Marine Research,Bremerhaven,Germany;

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正文语种英语
中图分类海洋学;
关键词
Strengthening; Atlantic Inflow; Across;

Strengthening Atlantic Inflow Across the Mid- Pleistocene Transition

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