Satellite signature of the instantaneous wind response to mesoscale oceanic thermal structures

IF 3 3区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
A. Meroni, Fabien Desbiolles, C. Pasquero
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引用次数: 0

Abstract

The thermal air‐sea interaction mechanism that modulates the atmospheric mixing by the sea surface temperature (SST) variability is studied with long‐term consistent satellite records. Statistical analyses of daily and instantaneous wind and SST data are performed over the major western boundary currents (WBCs). This wind‐SST coupling, that is mediated by the atmospheric mixing, is found to be very relevant on daily, and even shorter, time scales. Co‐located and simultaneous SST and surface wind fields (from Advanced Very High Resolution Radiometer and Advanced Scatterometer data) reveal that the atmosphere responds instantaneously to the presence of SST structures with a larger coupling coefficient with respect to daily and monthly time averaged fields. The coupling strength varies seasonally over the WBCs in the Northern Hemisphere, with the winter‐time coupling being the lowest. Reanalysis data show that this behaviour is related to the seasonality of the air‐sea temperature difference over the region of interest. Over the Northern Hemisphere WBCs, dry and cold continental air masses drive very unstable conditions, associated with a very weak thermal air‐sea coupling.This article is protected by copyright. All rights reserved.
中尺度海洋热结构瞬时风响应的卫星特征
利用长期一致的卫星记录研究了通过海表温度(SST)变率调节大气混合的热气-海相互作用机制。对主要西边界流的日和瞬时风和海温数据进行统计分析。这种由大气混合介导的风-海温耦合被发现在日常甚至更短的时间尺度上非常相关。同时定位的海温和地面风场(来自先进的超高分辨率辐射计和先进的散射计数据)表明,大气对海温结构的存在有即时响应,相对于日和月平均场具有更大的耦合系数。北半球wbc的耦合强度随季节变化,冬季耦合强度最低。再分析数据表明,这种行为与感兴趣区域的海气温差的季节性有关。在北半球WBCs上空,干燥和寒冷的大陆气团驱动着非常不稳定的条件,与非常弱的热气-海耦合有关。这篇文章受版权保护。版权所有。
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来源期刊
CiteScore
16.80
自引率
4.50%
发文量
163
审稿时长
3-8 weeks
期刊介绍: The Quarterly Journal of the Royal Meteorological Society is a journal published by the Royal Meteorological Society. It aims to communicate and document new research in the atmospheric sciences and related fields. The journal is considered one of the leading publications in meteorology worldwide. It accepts articles, comprehensive review articles, and comments on published papers. It is published eight times a year, with additional special issues. The Quarterly Journal has a wide readership of scientists in the atmospheric and related fields. It is indexed and abstracted in various databases, including Advanced Polymers Abstracts, Agricultural Engineering Abstracts, CAB Abstracts, CABDirect, COMPENDEX, CSA Civil Engineering Abstracts, Earthquake Engineering Abstracts, Engineered Materials Abstracts, Science Citation Index, SCOPUS, Web of Science, and more.
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