气候变化领域集成服务门户(CCPortal): Changes in the equatorial mode of the Tropical Atlantic in terms of the Bjerknes Feedback Index

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DOI	10.1007/s00382-021-05627-w
	Changes in the equatorial mode of the Tropical Atlantic in terms of the Bjerknes Feedback Index
	Silva P.; Wainer I.; Khodri M.
发表日期	2021
ISSN	0930-7575
卷号	56 期号:2021-09-10
英文摘要	One of the main modes of sea surface temperature variability in the Tropical Atlantic is the Atlantic Equatorial Mode or Atlantic Niño. The region of largest interannual variability, where the Atlantic Cold Tongue forms, is also a region of consistent biases in climate models. In this study, we investigate the interannual variability of the Tropical Atlantic and its changes in the recent decades in terms of the Bjerknes Feedback Index (I BJ) in a set of seven ocean reanalyses for the periods 1980–1999 and 2000–2010. Differences were observed among the reanalyses regarding their representation of each term of the Bjerknes Feedback, particularly regarding zonal surface currents, leading to differences in dynamical damping and the zonal advective feedback. However, a consistent negative index (damped) is observed in all reanalysis, with the thermocline feedback being the dominant positive term and thermal damping the dominant negative term. Warming trends are observed in sea surface temperatures in the cold tongue region in all reanalyses, as well as a decrease in interannual variability. These in turn are associated with a weakening in the Bjerknes Feedback in the early XXI century, indicated by a stronger and negative index. This results from a stronger thermal damping and weaker thermocline feedback, associated with a weaker response of equatorial zonal thermocline slope to equatorial zonal wind stress. Despite the spread among the reanalysis, the results obtained are consistent with previous studies. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH, DE part of Springer Nature.
英文关键词	Bjerknes Feedback; Equatorial Atlantic; Ocean reanalysis; Tropical variability
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183309
作者单位	Oceanographic Institute, University of São Paulo, Praca do Oceanografico 191, São Paulo, SP 05508120S, Brazil; LOCEAN-IRD/IPSL, Sorbonne University, Paris, France
推荐引用方式 GB/T 7714	Silva P.,Wainer I.,Khodri M.. Changes in the equatorial mode of the Tropical Atlantic in terms of the Bjerknes Feedback Index[J],2021,56(2021-09-10).
APA	Silva P.,Wainer I.,&Khodri M..(2021).Changes in the equatorial mode of the Tropical Atlantic in terms of the Bjerknes Feedback Index.Climate Dynamics,56(2021-09-10).
MLA	Silva P.,et al."Changes in the equatorial mode of the Tropical Atlantic in terms of the Bjerknes Feedback Index".Climate Dynamics 56.2021-09-10(2021).