Antarctic Cryospheric Change: Mechanisms and Feedback on Climate

南极冰冻圈变化：机制和对气候的反馈

• 批准号: 1745029
• 负责人: Michael Previdi
• 金额: $ 56.45万
• 依托单位: Columbia University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-09-15 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1745029&HistoricalAwards=false
• 关键词: Antarctic; Cryospheric; Change; Mechanisms; Feedback

The Antarctic cryosphere is a key component of the global climate system, being linked to global sea level through ice sheet mass balance, and to the global ocean overturning circulation through sea ice driven production of Antarctic Bottom Water. This research seeks enhance understanding of cryosphere-climate models interactions in the Antarctic, thereby allowing for attribution of recently observed changes, and for improved quantification of the physical drivers of model-simulated future climate. The project also seeks to contribute to the education and professional training of a graduate research assistant. Educational outreach will occur by partnering with local high school science teachers and students as part of the Secondary School Field Research Program (SSFRP). This partnership with the SSFRP will develop a 4- week curriculum on climate modeling that will be suitable for use in high school Earth Science or Physics courses.The project has three objectives. First, the cryospheric response to changes in the top-of the-atmosphere (TOA) absorbed solar radiation (ASR) at high southern latitudes will be assessed. The second objective of the project is to quantify the effect of ozone depletion and recovery on the mass balance of the Antarctic ice sheet. This will be accomplished both by analyzing the (Whole Atmosphere Community Climate) WACCM simulated surface mass balance, and by performing a series of sensitivity simulations with a stand-alone ice sheet model (the Ice Sheet System Model, or ISSM) forced by WACCM output. A third objective is to determine the atmospheric response to Antarctic sea-ice changes. This will be achieved by running WACCM with prescribed sea surface temperatures and sea-ice concentrations in order to examine the impacts of different sea-ice anomaly patterns.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

南极冰冻圈是全球气候系统的重要组成部分，通过冰盖质量平衡与全球海平面相联系，并通过海冰驱动的南极底层水生产与全球海洋翻转环流相联系。这项研究旨在加强对南极冰冻圈-气候模型相互作用的理解，从而能够对最近观察到的变化进行归因，并改进对模型模拟的未来气候的物理驱动因素的量化。该项目还力求为一名研究生助理的教育和专业培训作出贡献。教育推广将通过与当地高中科学教师和学生合作进行，作为中学实地研究计划（SSFRP）的一部分。与SSFRP的合作将开发一个为期4周的气候建模课程，该课程将适用于高中地球科学或物理课程。首先，将评估冰冻圈对南半球高纬度地区大气层顶吸收太阳辐射变化的反应。该项目的第二个目标是量化臭氧消耗和恢复对南极冰盖物质平衡的影响。这将通过分析（全大气群落气候）WACCM模拟的表面质量平衡，并通过执行一系列的敏感性模拟与独立的冰盖模型（冰盖系统模型，或ISSM）被迫WACCM输出。第三个目标是确定大气层对南极海冰变化的反应。这将通过运行指定的海面温度和海冰浓度的WACCM来实现，以检查不同海冰异常模式的影响。该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Interannual SAM Modulation of Antarctic Sea Ice Extent Does Not Account for Its Long‐Term Trends, Pointing to a Limited Role for Ozone Depletion

• DOI: 10.1029/2021gl094871
• 发表时间: 2021-10
• 期刊: Geophysical Research Letters
• 影响因子: 5.2
• 作者: L. Polvani;A. Banerjee;R. Chemke;E. Doddridge;D. Ferreira;A. Gnanadesikan;M. Holland;Y. Kostov;J. Marshall;W. Seviour;S. Solomon;D. Waugh

Tropical climate responses to projected Arctic and Antarctic sea-ice loss

• DOI: 10.1038/s41561-020-0546-9
• 发表时间: 2020-03-16
• 期刊: NATURE GEOSCIENCE
• 影响因子: 18.3
• 作者: England, Mark R.;Polvani, Lorenzo M.;Deser, Clara
• 通讯作者: Deser, Clara

Linking midlatitudes eddy heat flux trends and polar amplification

• DOI: 10.1038/s41612-020-0111-7
• 发表时间: 2020-02-19
• 期刊: NPJ CLIMATE AND ATMOSPHERIC SCIENCE
• 影响因子: 9
• 作者: Chemke, Rei;Polvani, Lorenzo M.
• 通讯作者: Polvani, Lorenzo M.