气候变化领域集成服务门户(CCPortal): Impacts of Projected Arctic Sea Ice Loss on Daily Weather Patterns over North America

CCPortal

DOI	10.1175/JCLI-D-23-0389.1
	Impacts of Projected Arctic Sea Ice Loss on Daily Weather Patterns over North America
	Gervais, Melissa; Sun, Lantao; Deserc, Clara
发表日期	2024
ISSN	0894-8755
EISSN	1520-0442
起始页码	37
结束页码	3
卷号	37 期号:3
英文摘要	Future Arctic sea ice loss has a known impact on Arctic amplification (AA) and mean atmospheric circulation. Furthermore, several studies have shown it leads to a decreased variance in temperature over North America. In this study, we analyze results from two fully coupled Community Earth System Model (CESM) Whole Atmosphere Community Climate Model (WACCM4) simulations with sea ice nudged to either the ensemble mean of WACCM historical runs averaged over the 1980-99 period for the control (CTL) or projected RCP8.5 values over the 2080-99 period for the experiment (EXP). Dominant large-scale meteorological patterns (LSMPs) are then identified using self-organizing maps applied to winter daily 500-hPa geopotential height anomalies (Z ' 500) over North America. We investigate how sea ice loss (EXP - CTL) impacts the frequency of these LSMPs and, through composite analysis, the sensible weather associated with them. We find differences in LSMP frequency but no change in residency time, indicating there is no stagnation of the flow with sea ice loss. Sea ice loss also acts to de-amplify and/or shift the Z ' 500 that characterize these LSMPs and their associated anomalies in potential temperature at 850 hPa. Impacts on precipitation anomalies are more localized and consistent with changes in anomalous sea level pressure. With this LSMP framework we provide new mechanistic insights, demonstrating a role for thermodynamic, dynamic, and diabatic processes in sea ice impacts on atmospheric variability. Understanding these processes from a synoptic perspective is critical as some LSMPs play an outsized role in producing the mean response to Arctic sea ice loss.
英文关键词	Sea ice; Atmospheric circulation; Synoptic-scale processes; Climate change; Climate models; Machine learning
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:001165234200001
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/300292
作者单位	Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; Pennsylvania Commonwealth System of Higher Education (PCSHE); Pennsylvania State University; Colorado State University; National Center Atmospheric Research (NCAR) - USA
推荐引用方式 GB/T 7714	Gervais, Melissa,Sun, Lantao,Deserc, Clara. Impacts of Projected Arctic Sea Ice Loss on Daily Weather Patterns over North America[J],2024,37(3).
APA	Gervais, Melissa,Sun, Lantao,&Deserc, Clara.(2024).Impacts of Projected Arctic Sea Ice Loss on Daily Weather Patterns over North America.JOURNAL OF CLIMATE,37(3).
MLA	Gervais, Melissa,et al."Impacts of Projected Arctic Sea Ice Loss on Daily Weather Patterns over North America".JOURNAL OF CLIMATE 37.3(2024).