The bi-polar seesaw and CO2: Is there anything special about 'Terminal seesaw events'?

双极跷跷板和二氧化碳：“末端跷跷板事件”有什么特别之处吗？

• 批准号: NE/J010545/1
• 负责人: Luke Skinner
• 金额: $ 31.93万
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2012
• 资助国家: 英国
• 起止时间: 2012 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=NE%2FJ010545%2F1
• 关键词: bi; polar; seesaw; CO2; there

A new paradigm has emerged in recent years for explaining late Pleistocene glacial-interglacial climate transitions. According to this paradigm, a clear distinction between mechanisms that operate on 'orbital' and on 'millennial' timescales is no longer made. The slow orbital (insolation) pacing of the ice-ages would thus engender strong positive feedbacks, which could themselves emerge on much shorter timescales. Glacial-interglacial fluctuations in atmospheric CO2 are emblematic of this notion; they clearly make an important contribution to glacial-interglacial radiative forcing, but they appear to accrue through rapid changes that are somehow linked with asymmetric inter-hemispheric climate anomalies (the 'bipolar seessaw'). However, not all rapid changes in atmospheric CO2 are associated with glacial-interglacial transitions. This raises the important question of what has controlled millennial CO2 changes in the past, and what (if anything) is special about deglacial versus mid-glacial CO2 pulses. Current data does not allow us to address these questions adequately. What is needed is a new set of high-resolution reconstructions of Southern Ocean up-welling and deep-water ventilation, which can be linked to the ice-core chronology and thus compared with similarly detailed records of abrupt North Atlantic climate variability. This project sets out to provide these reconstructions, and on thus place our understanding of past millennial CO2 variability on a more robust observational footing than has hitherto been possible.

近年来出现了一种解释晚更新世冰期-间冰期气候转变的新范式。根据这一范式，在“轨道”和“千年”时间尺度上运作的机制之间不再有明确的区别。因此，冰河时代缓慢的轨道（日照）节奏将产生强烈的正反馈，而这些反馈本身可能在更短的时间尺度上出现。大气CO2的冰川-间冰期波动是这一概念的象征;它们显然对冰川-间冰期辐射强迫做出了重要贡献，但它们似乎是通过与不对称的半球间气候异常（“两极跷跷板”）有关的快速变化而产生的。然而，并不是所有的大气CO2的快速变化都与冰川-间冰期过渡有关。这就提出了一个重要的问题，即是什么控制了过去千年的二氧化碳变化，以及冰消期与中冰期的二氧化碳脉冲有什么特别之处（如果有的话）。目前的数据不允许我们充分解决这些问题。现在需要的是一套新的高分辨率重建南大洋上升流和深水通风，这可以与冰芯年代学联系起来，从而与北大西洋气候突变的类似详细记录进行比较。该项目旨在提供这些重建，从而将我们对过去千年CO2变化的理解置于比迄今为止更强大的观测基础上。

项目成果

Southern Ocean link between changes in atmospheric CO2 levels and northern-hemisphere climate anomalies during the last two glacial periods

• DOI: 10.1016/j.quascirev.2019.106067
• 发表时间: 2020-02
• 期刊: Quaternary Science Reviews
• 影响因子: 4
• 作者: J. Gottschalk;L. Skinner;S. Jaccard;L. Menviel;Christoph Nehrbass-Ahles;C. Waelbroeck

Age and duration of Laschamp and Iceland Basin geomagnetic excursions in the South Atlantic Ocean

• DOI: 10.1016/j.quascirev.2017.04.020
• 发表时间: 2017-07
• 期刊: Quaternary Science Reviews
• 影响因子: 4
• 作者: J. Channell;N. V. Riveiros;J. Gottschalk;C. Waelbroeck;L. Skinner

Past Carbonate Preservation Events in the Deep Southeast Atlantic Ocean (Cape Basin) and Their Implications for Atlantic Overturning Dynamics and Marine Carbon Cycling

• DOI: 10.1029/2018pa003353
• 发表时间: 2018-06
• 期刊: Paleoceanography and Paleoclimatology
• 影响因子: 3.5
• 作者: J. Gottschalk;D. Hodell;L. Skinner;S. Crowhurst;S. Jaccard;C. Charles

Contribution of seasonal sub-Antarctic surface water variability to millennial-scale changes in atmospheric CO2 over the last deglaciation and Marine Isotope Stage 3

• DOI: 10.1016/j.epsl.2014.11.051
• 发表时间: 2015-02-01
• 期刊: EARTH AND PLANETARY SCIENCE LETTERS
• 影响因子: 5.3
• 作者: Gottschalk, Julia;Skinner, Luke C.;Waelbroeck, Claire
• 通讯作者: Waelbroeck, Claire

Biological and physical controls in the Southern Ocean on past millennial-scale atmospheric CO2 changes.

• DOI: 10.1038/ncomms11539
• 发表时间: 2016-05-17
• 期刊: Nature communications
• 影响因子: 16.6
• 作者: Gottschalk J;Skinner LC;Lippold J;Vogel H;Frank N;Jaccard SL;Waelbroeck C
• 通讯作者: Waelbroeck C