DOI: 10.1007/s00382-015-2691-1
Scopus记录号: 2-s2.0-84930526253
论文题名: Understanding long-term (1982–2013) multi-decadal change in the equatorial and subtropical South Atlantic climate
作者: Vizy E.K. ; Cook K.H.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 46, 期: 2017-07-08 起始页码: 2087
结束页码: 2113
语种: 英语
英文关键词: African climate trends
; Air-sea interactions
; Angolan thermal low
; South atlantic anticyclone
; South atlantic climate variability
; South atlantic SST trends
英文摘要: High-resolution observations along with atmospheric and oceanic reanalyses are diagnosed to understand how and why southeastern Atlantic SSTs have changed over the 1982–2013 period. Multiple datasets are used to evaluate confidence. Results indicate significant SST warming trends (0.5–1.5 K per 32-years) along the Guinean and Angolan/Namibian Coasts, and a cooling trend (−0.10 to −0.60 K per 32-years) over the subtropical South Atlantic between 18°S and 28°S. SST trends are shown to vary over the annual cycle with the greatest changes occurring during November–January. Analysis of the ocean surface heat balance reveals that the austral summer SST warming trend along the Angolan/Namibian Coast is associated with an increase in the net downward atmospheric heat flux. In addition, there is a decrease in coastal upwelling due to circulation changes related to a poleward shift of the South Atlantic subtropical anticyclone and an intensification of the southwestern African thermal low. The cooling trend over the subtropical South Atlantic is also associated with the poleward shift of the South Atlantic anticyclone, as stronger surface winds enhance latent heat loss from the ocean over this region. Positive SST trends along the Guinean coast are found to be primarily associated with changes internal to the ocean, specifically, reduced coastal upwelling, diffusion, and enhanced horizontal transport of warmer water. These results highlight the need to better understand South Atlantic subtropical anticyclone and the continental thermal low interactions and their implications for present day climate variability and future climate change. © The Author(s) 2015. 资助项目: NASA, National Aeronautics and Space Administration
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53690
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Department of Geological Sciences, Jackson School of Geosciences, The University of Texas at Austin, 1 University Station C1100, Austin, TX, United States
Recommended Citation:
Vizy E.K.,Cook K.H.. Understanding long-term (1982–2013) multi-decadal change in the equatorial and subtropical South Atlantic climate[J]. Climate Dynamics,2016-01-01,46(2017-07-08)