气候变化领域集成服务门户(CCPortal): Nonlinear response of the Antarctic Ice Sheet to late Quaternary sea level and climate forcing

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DOI	10.5194/tc-13-2615-2019
	Nonlinear response of the Antarctic Ice Sheet to late Quaternary sea level and climate forcing
	Tigchelaar M.; Timmermann A.; Friedrich T.; Heinemann M.; Pollard D.
发表日期	2019
ISSN	19940416
EISSN	13
起始页码	2615
结束页码	2631
卷号	13 期号:10
英文摘要	Antarctic ice volume has varied substantially during the late Quaternary, with reconstructions suggesting a glacial ice sheet extending to the continental shelf break and interglacial sea level highstands of several meters. Throughout this period, changes in the Antarctic Ice Sheet were driven by changes in atmospheric and oceanic conditions and global sea level; yet, so far modeling studies have not addressed which of these environmental forcings dominate and how they interact in the dynamical ice sheet response. Here, we force an Antarctic Ice Sheet model with global sea level reconstructions and transient, spatially explicit boundary conditions from a 408 ka climate model simulation, not only in concert with each other but, for the first time, also separately.We find that together these forcings drive glacial-interglacial ice volume changes of 12-14ms:l:e:, in line with reconstructions and previous modeling studies. None of the individual drivers-atmospheric temperature and precipitation, ocean temperatures, or sea level-single-handedly explains the full ice sheet response. In fact, the sum of the individual ice volume changes amounts to less than half of the full ice volume response, indicating the existence of strong nonlinearities and forcing synergy. Both sea level and atmospheric forcing are necessary to create full glacial ice sheet growth, whereas the contribution of ocean melt changes is found to be more a function of ice sheet geometry than climatic change. Our results highlight the importance of accurately representing the relative timing of forcings of past ice sheet simulations and underscore the need for developing coupled climate-ice sheet modeling frameworks that properly capture key feedbacks. © 2019 Author(s).
学科领域	atmosphere-ocean coupling; boundary condition; climate change; climate forcing; climate modeling; continental shelf; glacial-interglacial cycle; ice sheet; Quaternary; sea level; shelf break; Antarctic Ice Sheet; Antarctica
语种	英语
scopus关键词	atmosphere-ocean coupling; boundary condition; climate change; climate forcing; climate modeling; continental shelf; glacial-interglacial cycle; ice sheet; Quaternary; sea level; shelf break; Antarctic Ice Sheet; Antarctica
来源期刊	The Cryosphere
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118828
作者单位	Center for Ocean Solutions, Stanford University, Palo Alto, CA, United States; Center for Climate Physics, Institute for Basic Science, Busan, South Korea; Pusan National University, Busan, South Korea; Department of Oceanography, University of Hawai'i at Mānoa, Honolulu, HI, United States; Institute of Geosciences, Kiel University, Kiel, Germany; Earth and Environmental Systems Institute, Pennsylvania State University, University Park, PA, United States
推荐引用方式 GB/T 7714	Tigchelaar M.,Timmermann A.,Friedrich T.,et al. Nonlinear response of the Antarctic Ice Sheet to late Quaternary sea level and climate forcing[J],2019,13(10).
APA	Tigchelaar M.,Timmermann A.,Friedrich T.,Heinemann M.,&Pollard D..(2019).Nonlinear response of the Antarctic Ice Sheet to late Quaternary sea level and climate forcing.The Cryosphere,13(10).
MLA	Tigchelaar M.,et al."Nonlinear response of the Antarctic Ice Sheet to late Quaternary sea level and climate forcing".The Cryosphere 13.10(2019).