气候变化领域集成服务门户(CCPortal): Impact of Winds and Southern Ocean SSTs on Antarctic Sea Ice Trends and Variability

CCPortal

DOI	10.1175/JCLI-D-20-0386.1
	Impact of Winds and Southern Ocean SSTs on Antarctic Sea Ice Trends and Variability
	Blanchard-Wrigglesworth E.; Roach L.A.; Donohoe A.; Ding Q.
发表日期	2021
ISSN	0894-8755
起始页码	949
结束页码	965
卷号	34 期号:3
英文摘要	Antarctic sea ice extent (SIE) has slightly increased over the satellite observational period (1979 to the present) despite global warming. Several mechanisms have been invoked to explain this trend, such as changes in winds, precipitation, or ocean stratification, yet there is no widespread consensus. Additionally, fully coupled Earth system models run under historic and anthropogenic forcing generally fail to simulate positive SIE trends over this time period. In this work, we quantify the role of winds and Southern Ocean SSTs on sea ice trends and variability with an Earth system model run under historic and anthropogenic forcing that nudges winds over the polar regions and Southern Ocean SSTs north of the sea ice to observations from 1979 to 2018. Simulations with nudged winds alone capture the observed interannual variability in SIE and the observed long-term trends from the early 1990s onward, yet for the longer 1979–2018 period they simulate a negative SIE trend, in part due to faster-than-observed warming at the global and hemispheric scale in the model. Simulations with both nudged winds and SSTs show no significant SIE trends over 1979–2018, in agreement with observations. At the regional scale, simulated sea ice shows higher skill compared to the pan-Antarctic scale both in capturing trends and interannual variability in all nudged simulations. We additionally find negligible impact of the initial conditions in 1979 on long-term trends. © 2021 American Meteorological Society.
英文关键词	Global warming; Sea ice; Wind; Antarctic sea ice; Anthropogenic forcing; Earth system model; Initial conditions; Interannual variability; Long-term trend; Ocean stratification; Southern ocean; Oceanography
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/170931
作者单位	Department of Atmospheric Sciences, University of Washington, Seattle, WA, United States; Polar Science Center, Applied Physics Laboratory, University of Washington, Seattle, WA, United States; Department of Geography, Earth Research Institute, University of California Santa Barbara, Santa Barbara, CA, United States
推荐引用方式 GB/T 7714	Blanchard-Wrigglesworth E.,Roach L.A.,Donohoe A.,et al. Impact of Winds and Southern Ocean SSTs on Antarctic Sea Ice Trends and Variability[J],2021,34(3).
APA	Blanchard-Wrigglesworth E.,Roach L.A.,Donohoe A.,&Ding Q..(2021).Impact of Winds and Southern Ocean SSTs on Antarctic Sea Ice Trends and Variability.Journal of Climate,34(3).
MLA	Blanchard-Wrigglesworth E.,et al."Impact of Winds and Southern Ocean SSTs on Antarctic Sea Ice Trends and Variability".Journal of Climate 34.3(2021).