https://scholars.lib.ntu.edu.tw/handle/123456789/628796
標題: | A Pathway for Northern Hemisphere Extratropical Cooling to Elicit a Tropical Response | 作者: | Luongo, Matthew T. Xie, Shang Ping Eisenman, Ian YEN-TING HWANG Tseng, Hung Yi |
關鍵字: | climate feedbacks | climate variability | cloud feedbacks | ENSO | 公開日期: | 28-一月-2023 | 卷: | 50 | 期: | 2 | 來源出版物: | Geophysical Research Letters | 摘要: | Previous studies have found that Northern Hemisphere aerosol-like cooling induces a La Niña-like response in the tropical Indo-Pacific. Here, we explore how a coupled ocean-atmosphere feedback pathway communicates and sustains this response. We override ocean surface wind stress in a comprehensive climate model to decompose the total ocean-atmosphere response to forced extratropical cooling into the response of surface buoyancy forcing alone and surface momentum forcing alone. In the subtropics, the buoyancy-forced response dominates: the positive low cloud feedback amplifies sea surface temperature (SST) anomalies which wind-driven evaporative cooling communicates to the tropics. In the equatorial Indo-Pacific, buoyancy-forced ocean dynamics cool the surface while the Bjerknes feedback creates zonally asymmetric SST patterns. Although subtropical cloud feedbacks are model-dependent, our results suggest this feedback pathway is robust across a suite of models such that models with a stronger subtropical low cloud response exhibit a stronger La Niña response. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/628796 | ISSN: | 00948276 | DOI: | 10.1029/2022GL100719 |
顯示於: | 大氣科學系 |
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