气候变化领域集成服务门户(CCPortal): Long-Term Trend of Equatorial Atlantic Zonal Sea Surface Temperature Gradient Linked to the Tropical Pacific Cold Tongue Mode Under Global Warming

CCPortal

DOI	10.1029/2020JC017132
	Long-Term Trend of Equatorial Atlantic Zonal Sea Surface Temperature Gradient Linked to the Tropical Pacific Cold Tongue Mode Under Global Warming
	Li Y.; Chen Q.; Xing N.; Cheng Z.; Qi Y.; Feng F.; Li M.
发表日期	2021
ISSN	21699275
卷号	126 期号:5
英文摘要	The equatorial Atlantic zonal sea surface temperature (SST) gradient, which has significant climatic and biogeochemical effects, is closely associated with the equatorial Pacific zonal SST gradient through Walker circulation on seasonal and interannual time scales. However, discrepancies in current SST data sets mean that its long-term trend is not well understood. Here, using multiple data sets, we find a robust weakening long-term trend (i.e., greater warming in the east than west) in the equatorial Atlantic zonal SST gradient over the period 1900–2010 in all data sets. We also find that this weakening trend is closely linked to the tropical Pacific cold tongue mode (CTM), which corresponds to a strong increasing long-term trend of zonal SST gradient along the equatorial Pacific (i.e., warming in the west and cooling in the east). Specifically, the long-term cooling SST anomalies associated with the CTM modify the Walker circulation, and leads to weaker trade winds over the western equatorial Atlantic. These in turn deepen the thermocline in the eastern equatorial Atlantic, and cause the weakening long-term trend of SST gradient along the equatorial Atlantic. The long-term trend of the CTM is induced by ocean dynamical feedback in response to global warming, suggesting that global warming could affect the equatorial Atlantic zonal SST gradient via the CTM. Our results provide a novel explanation of the linkages between the long-term trend of equatorial Atlantic zonal SST gradient and the CTM under global warming, which carries important implications for the relationship between global warming and the equatorial Atlantic zonal SST gradient. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	cold tongue mode; equatorial Atlantic zonal SST gradient; global warming; La Niña-like long-term trend
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186351
作者单位	College of Atmospheric Science, Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu University of Information Technology, Chengdu, China; Beijing Meteorological Service, Beijing, China
推荐引用方式 GB/T 7714	Li Y.,Chen Q.,Xing N.,et al. Long-Term Trend of Equatorial Atlantic Zonal Sea Surface Temperature Gradient Linked to the Tropical Pacific Cold Tongue Mode Under Global Warming[J],2021,126(5).
APA	Li Y..,Chen Q..,Xing N..,Cheng Z..,Qi Y..,...&Li M..(2021).Long-Term Trend of Equatorial Atlantic Zonal Sea Surface Temperature Gradient Linked to the Tropical Pacific Cold Tongue Mode Under Global Warming.Journal of Geophysical Research: Oceans,126(5).
MLA	Li Y.,et al."Long-Term Trend of Equatorial Atlantic Zonal Sea Surface Temperature Gradient Linked to the Tropical Pacific Cold Tongue Mode Under Global Warming".Journal of Geophysical Research: Oceans 126.5(2021).