Decadal Variability of Southeast US Rainfall in an Eddying Global Coupled Model

Decadal Variability of Southeast US Rainfall in an Eddying Global Coupled Model
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涡流全球耦合模型中美国东南部降雨量的年代际变化

DOI:
10.1029/2021gl096709
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发表时间:
2021
影响因子:
5.2
通讯作者:
Perlin, Natalie
Perlin, Natalie
中科院分区:
地球科学1区
文献类型:
--
作者:
Zhang, Wei;Kirtman, Ben;Siqueira, Leo;Xiang, Baoqiang;Infanti, Johnna;Perlin, Natalie

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海洋变率是远程降雨可预测性的主要来源,但在许多情况下,驱动这种可预测性的物理机制尚未完全了解。本研究探讨了海洋中尺度(即墨西哥湾流海温锋)如何影响美国东南部(SEUS)的年代际降水,认为大尺度遥相关的局部印记对已解决的中尺度特征很敏感。基于涡旋和涡旋参数化海洋的全球耦合模式实验,我们发现墨西哥湾流的分解改善了局地降雨和SEUS的远程环流响应。涡旋模式通常改善了墨西哥湾流和北大西洋副热带高压的海气相互作用,这些海气相互作用在年代际尺度上调节了SEUS的降雨。涡参数化模拟未能捕捉到与墨西哥湾流相关的海温急剧梯度,并且高估了热带太平洋海温异常在SEUS降水中的作用。
Ocean variability is a dominant source of remote rainfall predictability, but in many cases the physical mechanisms driving this predictability are not fully understood. This study examines how ocean mesoscales (i.e., the Gulf Stream SST front) affect decadal Southeast US (SEUS) rainfall, arguing that the local imprint of large‐scale teleconnections is sensitive to resolved mesoscale features. Based on global coupled model experiments with eddying and eddy‐parameterizing ocean, we find that a resolved Gulf Stream improves localized rainfall and remote circulation response in the SEUS. The eddying model generally improves the air‐sea interactions in the Gulf Stream and the North Atlantic Subtropical High that modulate SEUS rainfall over decadal timescales. The eddy‐parameterizing simulation fails to capture the sharp SST gradient associated with the Gulf Stream and overestimates the role of tropical Pacific SST anomalies in the SEUS rainfall.
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发表时间: 2021
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