Barrier Layer Variability in the Central Equatorial Pacific Associated With ENSO Development

被引：0

作者：

Guan, Cong ^{[1
,2
,3
,4
,5
]}

McPhaden, Michael J. ^{[6
]}

Hu, Shijian ^{[1
,2
,3
,4
,5
]}

Wang, Fan ^{[1
,2
,4
,5
]}

Li, Yuanlong ^{[1
,2
,4
,5
]}

Cui, Manman ^{[1
,2
,4
,5
]}

机构：

[1] Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Observat & Forecasting, Qingdao, Peoples R China

[2] Chinese Acad Sci, Inst Oceanol, Key Lab Ocean Circulat & Waves, Qingdao, Peoples R China

[3] Hohai Univ, Coll Oceanog, Nanjing, Peoples R China

[4] Laoshan Lab, Qingdao, Peoples R China

[5] Univ Chinese Acad Sci, Coll Marine Sci, Qingdao, Peoples R China

[6] NOAA, Pacific Marine Environm Lab, Seattle, WA USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2025年 / 52卷 / 07期

基金：

中国国家自然科学基金;

关键词：

SEA-SURFACE SALINITY; FRESH-WATER FLUX; TROPICAL PACIFIC; TOGA DECADE; MIXED-LAYER; WARM POOL; OCEAN; MODEL; OGCM;

D O I：

10.1029/2024GL113396

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Previous studies suggest that a thick barrier layer can strengthen surface warming during El Ni & ntilde;o and vice versa for La Ni & ntilde;a. Here we find barrier layer changes of up to 6 m in the central equatorial Pacific (CEP, 170 degrees E-160 degrees W, 5 degrees S-5 degrees N) in response to a 1 degrees C change in the Ni & ntilde;o 3.4 index using 19 years of Argo observations. Our analysis reveals that mixed layer variability due to strong interannual salinity anomalies determines the changes in CEP barrier layer thickness (BLT) during El Ni & ntilde;o Southern Oscillation events since isothermal layer variations are minimal there. During El Ni & ntilde;o, enhanced rainfall leads to anomalous surface freshening in the CEP especially west of the dateline, while anomalous vertical-sheared zonal current results in stronger vertical salinity stratification and thicker barrier layer east of the dateline in the CEP. Surface-layer zonal current advection in general contributes to a thicker barrier layer in the entire CEP.

引用

页数：9

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