On the Possible Link between Tropical Convection and the Northern Hemisphere Arctic Surface Air Temperature Change between 1958 and 2001

doi:10.1175/2011JCLI4003.1

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋环流与波动重点实验室

	On the Possible Link between Tropical Convection and the Northern Hemisphere Arctic Surface Air Temperature Change between 1958 and 2001
	Lee, Sukyoung 1; Gong, Tingting 1,2; Johnson, Nathaniel 3; Feldstein, Steven B.1; Pollard, David 4
刊名	JOURNAL OF CLIMATE
	2011-08-01
卷号	24 期号:16 页码:4350-4367
ISSN号	0894-8755
DOI	10.1175/2011JCLI4003.1
文献子类	Article
英文摘要	This study presents mechanisms for the polar amplification of surface air temperature that occurred in the Northern Hemisphere (NH) between the periods of 1958-77 (P1) and 1982-2001 (P2). Using European Centre for Medium-Range Weather Forecasts Re-Analysis (ERA-40) reanalysis data, it is found that over the ice-covered Arctic Ocean, the winter surface warming arises from dynamic warming (stationary eddy heat flux and adiabatic warming). Over the ice-free Arctic Ocean between the Greenland and the Barents Seas, downward infrared radiative (IR) flux is found to dominate the warming.; This study presents mechanisms for the polar amplification of surface air temperature that occurred in the Northern Hemisphere (NH) between the periods of 1958-77 (P1) and 1982-2001 (P2). Using European Centre for Medium-Range Weather Forecasts Re-Analysis (ERA-40) reanalysis data, it is found that over the ice-covered Arctic Ocean, the winter surface warming arises from dynamic warming (stationary eddy heat flux and adiabatic warming). Over the ice-free Arctic Ocean between the Greenland and the Barents Seas, downward infrared radiative (IR) flux is found to dominate the warming. To investigate whether the difference in the flow between P1 and P2 is due to changes in the frequency of occurrence of a small number of teleconnection patterns, a coupled self-organizing map (SOM) analysis of the 250-hPa streamfunction and tropical convective precipitation is performed. The latter field was specified to lead the former by 5 days. The results of the analysis showed that the P2 - P1 trend arises from a decrease in the frequency of negative phase PNA-like and circumglobal streamfunction patterns and a corresponding increase in the frequency of positive PNA-like and circumglobal streamfunction patterns. The occurrence of the two strong 1982-83 and 1997-98 El Nino events also contributes toward this trend. The corresponding trend in the convective precipitation is from below average to above average values in the tropical Indo-western Pacific region. Each of the above patterns was found to have an e-folding time scale from 6 to 8 days, which implies that the P2 - P1 trend can be understood as arising from the change in the frequency of occurrence of teleconnection patterns that fluctuate on intraseasonal time scales. The link between intraseasonal and interannual variability was further examined by linearly regressing various quantities against trend patterns with interannual variability subtracted. It was found that enhanced convective precipitation is followed 3-6 days later by the occurrence of the P2 - P1 circulation trend pattern, and then 1-2 days later by the corresponding trend pattern in the downward IR flux. This finding suggests that an increased frequency of the above sequence of events, which occurs on intraseasonal time scales, can account for the NH winter polar amplification of the surface air temperature via increased dynamic warming and downward IR flux.
学科主题	Meteorology & Atmospheric Sciences
URL标识	查看原文
语种	英语
WOS记录号	WOS:000294490600009
公开日期	2012-07-03
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/11598]
专题	海洋研究所_海洋环流与波动重点实验室
作者单位	1.Penn State Univ, Dept Meteorol, University Pk, PA 16802 USA 2.Chinese Acad Sci, Inst Oceanog, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China 3.Univ Hawaii Manoa, Int Pacific Res Ctr, Honolulu, HI 96822 USA 4.Penn State Univ, Earth & Environm Syst Inst, University Pk, PA 16802 USA
推荐引用方式 GB/T 7714	Lee, Sukyoung,Gong, Tingting,Johnson, Nathaniel,et al. On the Possible Link between Tropical Convection and the Northern Hemisphere Arctic Surface Air Temperature Change between 1958 and 2001[J]. JOURNAL OF CLIMATE,2011,24(16):4350-4367.
APA	Lee, Sukyoung,Gong, Tingting,Johnson, Nathaniel,Feldstein, Steven B.,&Pollard, David.(2011).On the Possible Link between Tropical Convection and the Northern Hemisphere Arctic Surface Air Temperature Change between 1958 and 2001.JOURNAL OF CLIMATE,24(16),4350-4367.
MLA	Lee, Sukyoung,et al."On the Possible Link between Tropical Convection and the Northern Hemisphere Arctic Surface Air Temperature Change between 1958 and 2001".JOURNAL OF CLIMATE 24.16(2011):4350-4367.