Heinrich summers
Heinrich summers
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海因里希·萨默斯
DOI：
10.1016/j.quascirev.2022.107750
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发表时间：
2022
影响因子：
4
通讯作者：
Russell, Joellen L.
中科院分区：
文献类型：
--
作者：
Denton, George H.;Toucanne, Samuel;Putnam, Aaron E.;Barrell, David J.A.;Russell, Joellen L.
格陵兰岛和南极冰芯记录的最后一个冰期千年尺度的气候波动并不总是一致的。一个显著的例子是，最强的南极变暖事件发生在北大西洋地区的海因里希事件期间。虽然两极跷跷板为这种反相位提供了一种可能的解释，但它并不能解释同样惊人的观察结果，即大约一半的时间里，气候在两个半球之间一致变化。这种相位差异表明需要另一种假设，即两极地区有时对共同的强迫作出一致的反应，而在其他时候则留下两极跷跷板的印象。我们假设，这种印象是由于每次海因里希事件期间，北大西洋附近大陆冰盖的夏季比平时温暖造成的。相对温暖的海因里希夏季产生了足够多的融水和冰山，在新鲜的海洋表面上广泛存在的海冰刺激了非常寒冷的冬季条件。海因里希事件之间的间隔表明，由于夏季融水和冰山流入减少，海冰引起的冬季严酷程度有所缓解，表明夏季条件相对较冷。据推测，淡水通量的致病变化是由一种气候信号驱动的，这种信号在南极冰芯中最为明显，但在两极半球的其他古气候记录中也得到确认。我们认为，这一广泛的信号是由南方西风带的纬度和强度变化以及由此对西太平洋热带暖池的影响引起的，这种机制被称为西兰洲开关。
millennial-scale climate oscillations of the last ice age registered in greenland and antarctic ice cores did not always vary in unison. a striking example is that the strongest antarctic warming episodes occurred during heinrich episodes in the north atlantic region. although the bipolar seesaw affords a possible explanation for such anti-phasing, it does not account for the equally striking observation that climate varied in unison between the hemispheres about half the time. such phasing differences suggest the need for an alternative hypothesis in which the polar regions at times responded in unison to common forcing, and at other times left the impression of a bipolar seesaw. we posit that this impression arose from the effect of warmer-than-usual summers on continental ice sheets adjacent to the north atlantic ocean during each heinrich episode. the relatively warm heinrich summers produced discharges of meltwater and icebergs of sufficient volume to stimulate very cold winter conditions from widespread sea ice on a freshened ocean surface. the intervals between heinrich episodes featured relaxation of sea-ice-induced winter severity from reduced summertime influx of meltwater and icebergs, indicating relatively cooler summer conditions. it is postulated that the causative variations in freshwater fluxes were driven by a climate signal most evident in antarctic ice cores but also recognized in other paleoclimate records in both polar hemispheres. we suggest that this widespread signal arose from changes in the latitude and strength of the austral westerlies and the resulting effect on the western pacific tropical warm pool, a mechanism dubbed the zealandia switch.
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影响因子：
4
作者：
J. Schaefer;A. Putnam;G. Denton;M. Kaplan;S. Birkel;A. Doughty;Sam Kelley;D. Barrell;Robert C. Finkel;G. Winckler;Robert F. Anderson;U. Ninneman;S. Barker;R. Schwartz;B. G. Andersen;C. Schluechter
通讯作者：
J. Schaefer;A. Putnam;G. Denton;M. Kaplan;S. Birkel;A. Doughty;Sam Kelley;D. Barrell;Robert C. Finkel;G. Winckler;Robert F. Anderson;U. Ninneman;S. Barker;R. Schwartz;B. G. Andersen;C. Schluechter
影响因子：
4.3
作者：
D. Winski;T. Fudge;D. Ferris;E. Osterberg;J. Fegyveresi;J. Cole‐Dai;Zayta Thundercloud;Thomas S. Cox;K. Kreutz;Nikolas Ortman;C. Buizert;Jenna A. Epifanio;E. Brook;R. Beaudette;J. Severinghaus;T. Sowers;E. Steig;Emma C. Kahle;T. Jones;Valerie Morris;M. Aydin;M. R. Nicewonger;K. Casey;R. Alley;E. Waddington;N. Iverson;N. Dunbar;R. Bay;Joseph M. Souney;M. Sigl;J. McConnell
通讯作者：
D. Winski;T. Fudge;D. Ferris;E. Osterberg;J. Fegyveresi;J. Cole‐Dai;Zayta Thundercloud;Thomas S. Cox;K. Kreutz;Nikolas Ortman;C. Buizert;Jenna A. Epifanio;E. Brook;R. Beaudette;J. Severinghaus;T. Sowers;E. Steig;Emma C. Kahle;T. Jones;Valerie Morris;M. Aydin;M. R. Nicewonger;K. Casey;R. Alley;E. Waddington;N. Iverson;N. Dunbar;R. Bay;Joseph M. Souney;M. Sigl;J. McConnell
格陵兰岛新仙女木冰缘退缩：来自格陵兰岛西南部的新证据
影响因子：
4.3
作者：
S. Funder;Anita L. Sørensen;N. K. Larsen;A. Bjørk;J. Briner;J. Olsen;A. Schomacker;L. Levy;K. Kjær
通讯作者：
K. Kjær
影响因子：
18.3
作者：
Putnam, Aaron E.;Denton, George H.;Schaefer, Joerg M.;Barrell, David J.;Andersen, Bjørn G.;Finkel, Robert C.;Schwartz, Roseanne;Doughty, Alice M.;Kaplan, Michael R.;Schlüchter, Christian
通讯作者：
Schlüchter, Christian
影响因子：
5.8
作者：
Doughty, Alice M.;Schaefer, Joerg M.;Schwartz, Roseanne
通讯作者：
Schwartz, Roseanne