A Persistent and Intense Marine Heatwave in the Northeast Pacific During 2019-2020

被引：64

作者：

Chen, Ziyan ^{[1
,2
]}

Shi, Jian ^{[1
,2
]}

Liu, Qinyu ^{[1
]}

Chen, Hui ^{[1
,2
]}

Li, Chun ^{[1
,2
]}

机构：

[1] Ocean Univ China, Key Lab Phys Oceanog, Qingdao, Peoples R China

[2] Ocean Univ China, Coll Ocean & Atmospher Sci, Qingdao, Peoples R China

来源：

GEOPHYSICAL RESEARCH LETTERS | 2021年 / 48卷 / 13期

基金：

中国国家自然科学基金; 国家重点研发计划;

关键词：

warm blob; heat flux; mixed layer; heat budget; La Nina; surface winds; SEA-SURFACE TEMPERATURE; IMPACTS; WAVE;

D O I：

10.1029/2021GL093239

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Motivated by increasing marine heatwaves (MHWs) and their dramatic climate effects, we analyze the persistent 2019-2020 MHW, which showed significant positive sea surface temperature (SST) anomalies in the Northeast Pacific. Four SST peaks were identified during its evolution, which appeared in November 2019, April, July, and November 2020. Positive temperature anomalies were mostly located within the mixed layer for the first-year winter peak. However, the warm core was centered around 50 m below (at the bottom of) the mixed layer for the summer (second-year winter) peak. The dominant factor for the two wintertime peaks was a surface heat flux anomaly, with reduction in evaporative cooling due to the easterly anomaly. The heat flux and potentially the vertical entrainment combined to induce the peak in spring. In the tropical Pacific, a La Nina event occurred following this MHW, while other recorded double-peak events were associated with El Nino or neutral conditions.

引用

页数：9

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