气候变化领域集成服务门户(CCPortal): Development, Amplification, and Decay of Atlantic/European Summer Weather Patterns Linked to Spring North Atlantic Sea Surface Temperatures

CCPortal

DOI	10.1175/JCLI-D-19-0613.1
	Development, Amplification, and Decay of Atlantic/European Summer Weather Patterns Linked to Spring North Atlantic Sea Surface Temperatures
	Ossó A.; Sutton R.; Shaffrey L.; Dong B.
发表日期	2020
ISSN	08948755
起始页码	5939
结束页码	5951
卷号	33 期号:14
英文摘要	A recent study identified a relationship between North Atlantic Ocean sea surface temperature (SST) gradients in spring and a specific pattern of atmospheric circulation in the following summer: The summer east Atlantic (SEA) pattern. It was shown that the SEA pattern is closely associated with meridional shifts in the eddy-driven jet in response to anomalous SST gradients. In this study, the physical mechanisms underlying this relationship are investigated further. It is shown that the predictable SEA pattern anomalies appear in June-July and undergo substantial amplification between July and August before decaying in September. The associated SST anomalies also grow in magnitude and spatial extent from June to August. The question of why the predictable atmospheric anomalies should occur in summer is addressed, and three factors are identified. The first is the climatological position of the storm track, which migrates poleward from spring to summer. The second is that the magnitude of interannual SST variability underlying the storm track peaks in summer, both in absolute terms, and relative to the underlying mean SST gradient. The third factor is the most interesting. We identify a positive coupled ocean-atmosphere feedback, which operates in summer and leads to the amplification of both SST and atmospheric circulation anomalies. The extent to which the identified processes are captured in the HadGEM3-GC2 climate model is also assessed. The model is able to capture the relationship between spring North Atlantic SSTs and subsequent ocean-atmosphere conditions in early summer, but the relationship is too weak. The results suggest that the real world might be more predictable than is inferred from the models. © 2020 American Meteorological Society. All rights reserved.
语种	英语
scopus关键词	Atmospheric temperature; Climate models; Climatology; Storms; Submarine geophysics; Surface properties; Surface waters; Atmospheric anomaly; Atmospheric circulation; Atmospheric circulation anomaly; North Atlantic Ocean; Ocean atmosphere; Physical mechanism; Sea Surface Temperature gradients; Weather patterns; Oceanography; atmospheric circulation; climate modeling; gradient analysis; jet; meridional circulation; sea surface temperature; seasonal variation; temperature anomaly; Atlantic Ocean; Atlantic Ocean (North)
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/178728
作者单位	Wegener Center for Climate and Global Change, University of Graz, Graz, Austria; NCAS-Climate, University of Reading, Reading, United Kingdom
推荐引用方式 GB/T 7714	Ossó A.,Sutton R.,Shaffrey L.,et al. Development, Amplification, and Decay of Atlantic/European Summer Weather Patterns Linked to Spring North Atlantic Sea Surface Temperatures[J],2020,33(14).
APA	Ossó A.,Sutton R.,Shaffrey L.,&Dong B..(2020).Development, Amplification, and Decay of Atlantic/European Summer Weather Patterns Linked to Spring North Atlantic Sea Surface Temperatures.Journal of Climate,33(14).
MLA	Ossó A.,et al."Development, Amplification, and Decay of Atlantic/European Summer Weather Patterns Linked to Spring North Atlantic Sea Surface Temperatures".Journal of Climate 33.14(2020).