Salinity variability in the tropical Pacific during the Central-Pacific and Eastern-Pacific El Nino events

被引:20
作者
Qi, Jifeng [1 ,2 ,3 ,4 ]
Zhang, Linlin [1 ,2 ,4 ]
Qu, Tangdong [3 ]
Yin, Baoshu [1 ,2 ,4 ,5 ]
Xu, Zhenhua [1 ,2 ,4 ]
Yang, Dezhou [1 ,2 ,4 ]
Li, Delei [1 ,2 ,4 ]
Qin, Yinghao [6 ]
机构
[1] Chinese Acad Sci, Inst Oceanol, CAS Key Lab Ocean Circulat & Waves, 7 Nanhai Rd, Qingdao 266071, Shandong, Peoples R China
[2] Pilot Natl Lab Marine Sci & Technol Qingdao, Qingdao, Shandong, Peoples R China
[3] Univ Calif Los Angeles, Joint Inst Reg Earth Syst Sci & Engn, Los Angeles, CA USA
[4] Chinese Acad Sci, Ctr Ocean Megasci, Qingdao, Shandong, Peoples R China
[5] Univ Chinese Acad Sci, Beijing, Peoples R China
[6] Natl Marine Environm Forecasting Ctr, Beijing, Peoples R China
基金
中国国家自然科学基金;
关键词
Sea surface salinity; El Nino; Tropical Pacific; ORAS4; reanalysis; SEA-SURFACE SALINITY; MIXED-LAYER SALINITY; EQUATORIAL PACIFIC; INTERANNUAL VARIATIONS; BARRIER LAYER; WARM POOL; ENSO; OCEAN; IMPACT; PRECIPITATION;
D O I
10.1016/j.jmarsys.2019.103225
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
In this study, sea surface salinity (SSS) variability associated with two types of El Nino in the tropical Pacific is investigated using observational data and reanalysis products for the period from 1979 to 2017. The results show that the central (CP) and eastern (EP) Pacific El Nino events have distinct SSS signatures. During a CP El Nino event, negative SSS anomalies appear in the western equatorial Pacific, and positive SSS anomalies in the east. During an EP El Nino event, large negative SSS anomalies occur in the central equatorial Pacific and positive SSS anomalies in the west, with the core of negative SSS anomalies being shifted by about 25 degrees longitude eastward compared with a CP El Nino event. A composite analysis indicates that large differences in SSS anomalies between the two types of El Nino are confined to the fresh pool and Nino 3.4 regions. Surface freshwater flux and horizontal advection are two major factors modulating the SSS there, but their relative importance in the two regions is different. In the fresh pool region, the positive SSS anomalies during an EP El Nino are much larger than those during a CP El Nino event. Their differences are mainly caused by surface freshwater flux anomalies, and horizontal advection anomalies play a secondary role. In the Nino 3.4 region, SSS anomalies are positive during a CP El Nino but negative during an EP El Nino. These differences are mainly caused by horizontal advection anomalies rather than freshwater flux anomalies associated with El Nino.
引用
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页数:14
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