DOI: 10.1029/2018JC013915
Scopus记录号: 2-s2.0-85052840097
论文题名: Delayed and Quasi-Synchronous Response of Tropical Atlantic Surface Salinity to Rainfall
作者: Grodsky S.A. ; Carton J.A.
刊名: Journal of Geophysical Research: Oceans
ISSN: 21699275
出版年: 2018
卷: 123, 期: 8 起始页码: 5971
结束页码: 5985
语种: 英语
英文关键词: ENSO
; rainfall
; salinity
; satellite
; tropics
英文摘要: Zonally elongated patterns of tropical Atlantic rainfall variability associated with the Atlantic meridional (dipole) and the El Niño-Southern Oscillation (ENSO) modes extend over the ocean and adjacent land and lead to a complex sea surface salinity (SSS) response. SSS response to local ocean rainfall is quasi-instantaneous, while SSS response to land rainfall is delayed through river hydrology. Amazon rainfall associated with the Atlantic meridional mode concentrates over coastal north-east Brazil and results in a fast Amazon response. In contrast, ENSO rainfall occupies vast inland areas and results in 3- to 7-month delayed Amazon discharge response. Although ocean profile analyses represent well interannual SSS forced by open ocean rainfall, they miss interannual SSS in the plume. Including thermosalinograph transect data improves the representation of plume SSS, but its dynamic is better captured by ocean reanalyses. In Simple Ocean Data Assimilation, the plume SSS anomaly persists several months following the peak of land rainfall and is mixed out by seasonally accelerating winds in boreal winter. Its discharge-correlated magnitude is only a modest few tenths of PSU. Perhaps, such weak projection of continental discharge variations on simulated SSS is not surprising due to other factors contributing in this dynamically active western boundary area. Significant transient variability in local currents not associated with rainfall/discharge variability is a factor explaining why ocean analyses based on occasional profile observations fail in resolving the rain-induced SSS in the Amazon plume. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113390
Appears in Collections: 气候减缓与适应
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作者单位: Department of Atmospheric and Oceanic Science, University of Maryland, College Park, MD, United States
Recommended Citation:
Grodsky S.A.,Carton J.A.. Delayed and Quasi-Synchronous Response of Tropical Atlantic Surface Salinity to Rainfall[J]. Journal of Geophysical Research: Oceans,2018-01-01,123(8)