气候变化领域集成服务门户(CCPortal): The impact of changes in tropical sea surface temperatures over 1979-2012 on northern hemisphere high-latitude climate

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DOI	10.1175/JCLI-D-19-0456.1
	The impact of changes in tropical sea surface temperatures over 1979-2012 on northern hemisphere high-latitude climate
	Mccrystall M.R.; Hosking J.S.; White I.P.; Maycock A.C.
发表日期	2020
ISSN	0894-8755
起始页码	5103
结束页码	5121
卷号	33 期号:12
英文摘要	While rapid changes in Arctic climate over recent decades are widely documented, the importance of different driving mechanisms is still debated. A previous study proposed a causal connection between recent tropical Pacific sea surface temperature (SST) trends and circulation changes over northern Canada and Greenland (NCG). Here, using the HadGEM3-A model, we perform a suite of sensitivity experiments to investigate the influence of tropical SSTs on winter atmospheric circulation over NCG. The experiments are forced with observed SST changes between an "early"(1979-88) and "late"period (2003-12) and applied across the entire tropics (TropSST), the tropical Pacific (PacSST), and the tropical Atlantic (AtlSST). In contrast to the previous study, all three experiments show a negative 200-hPa eddy geopotential height (Z200) anomaly over NCG in winter, which is similar to the response in AMIP experiments from four other climate models. The positive Z200 NCG anomaly in ERA-Interim between the two periods is inside the bounds of internal variability estimated from bootstrap sampling. The NCG circulation anomaly in the TropSST experiment is associated with a Rossby wave train originating from the tropical Pacific, with an important contribution coming from the tropical Atlantic SSTs connected via an atmospheric bridge through the tropical Pacific. This generates anomalous upper-level convergence and a positive Rossby wave source anomaly near the North Pacific jet exit region. Hence, while a tropics-Arctic teleconnection is evident, its influence on recent Arctic regional climate differs from observed changes and warrants further research. © 2020 American Meteorological Society.
英文关键词	Atmospheric temperature; Climate change; Climate models; Mechanical waves; Submarine geophysics; Surface properties; Surface waters; Tropics; Atmospheric circulation; Bootstrap samplings; Circulation anomalies; Circulation changes; Geo-potential heights; Internal variability; Northern Hemispheres; Sea surface temperature (SST); Oceanography; arctic environment; atmospheric circulation; climate change; climate modeling; Northern Hemisphere; regional climate; Rossby wave; sea surface temperature; teleconnection; tropical meteorology; Arctic; Atlantic Ocean; Atlantic Ocean (Tropical); Canada; Greenland; Pacific Ocean; Pacific Ocean (North); Pacific Ocean (Tropical)
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/171534
作者单位	British Antarctic Survey, Department of Chemistry, University of Cambridge, Cambridge, United Kingdom; Earth Science Institute, Hebrew University of Jerusalem, Givat Ram, Jerusalem, Israel; School of Earth and Environment, University of Leeds, Leeds, United Kingdom
推荐引用方式 GB/T 7714	Mccrystall M.R.,Hosking J.S.,White I.P.,et al. The impact of changes in tropical sea surface temperatures over 1979-2012 on northern hemisphere high-latitude climate[J],2020,33(12).
APA	Mccrystall M.R.,Hosking J.S.,White I.P.,&Maycock A.C..(2020).The impact of changes in tropical sea surface temperatures over 1979-2012 on northern hemisphere high-latitude climate.Journal of Climate,33(12).
MLA	Mccrystall M.R.,et al."The impact of changes in tropical sea surface temperatures over 1979-2012 on northern hemisphere high-latitude climate".Journal of Climate 33.12(2020).