气候变化领域集成服务门户(CCPortal): Assessing the role of the ocean–atmosphere coupling frequency in the western Maritime Continent rainfall

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DOI	10.1007/s00382-020-05266-7
	Assessing the role of the ocean–atmosphere coupling frequency in the western Maritime Continent rainfall
	Li Y.; Gupta A.S.; Taschetto A.S.; Jourdain N.C.; Di Luca A.; Done J.M.; Luo J.-J.
发表日期	2020
ISSN	0930-7575
起始页码	4935
结束页码	4952
卷号	54
英文摘要	High-frequency interactions between the ocean and atmosphere have the potential to affect lower frequency or mean state climate in various regions. Here we examine the importance of sub-daily air-sea interactions over the Maritime Continent region to the rectification of longer timescale variation. In order to determine the importance of these high-frequency interactions, we conducted two regional ocean–atmosphere coupled simulations over the Maritime Continent where exchanges between the oceanic and atmospheric components are performed either every hour (i.e. resolving diurnal changes) or every day. We find that coupling frequency has a significant influence on mean sea surface temperature (SST) and the mean state and diurnal cycle of rainfall over certain regions of the western Maritime Continent where air-sea interactions are strong during the Asian monsoon season, with little effect in other regions or seasons. Without sub-daily air-sea interactions, the mean SST along the southwest off Sumatra is ~ 2 °C warmer during the period from June to October as a result of a deepening of thermocline along the coast. This deepening is linked to anomalous downwelling equatorial eastward propagating Kelvin waves triggered by westerly anomalies in the eastern equatorial Indian Ocean. In addition, the mean rainfall in the vicinity of ocean warming increases, thereby producing an enhanced barrier layer that also provides a positive warming feedback. Although the coupling frequency has little impact on the timing of the rainfall diurnal cycle, suppression of sub-daily coupling significantly changes the diurnal rainfall amplitude causing a relative decrease (increase) in amplitude over the coast of Northwestern (Southwestern) Sumatra during the South Asian monsoon season. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Air-sea interaction; Coupling frequency; Ocean–atmosphere coupled model; Western maritime continent
语种	英语
scopus关键词	air-sea interaction; atmosphere-ocean coupling; climate modeling; diurnal variation; frequency analysis; monsoon; rainfall; sea surface temperature; Greater Sunda Islands; Sumatra; Sunda Isles
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/145447
作者单位	Institute for Climate and Application Research, Nanjing University of Information Science and Technology, Nanjing, China; Climate Change Research Centre, University of New South Wales, Sydney, NSW, Australia; Université Grenoble Alpes/CNRS/IRD/G-INP, IGE, Grenoble, France; National Center for Atmospheric Research, Boulder, CO, United States
推荐引用方式 GB/T 7714	Li Y.,Gupta A.S.,Taschetto A.S.,等. Assessing the role of the ocean–atmosphere coupling frequency in the western Maritime Continent rainfall[J],2020,54.
APA	Li Y..,Gupta A.S..,Taschetto A.S..,Jourdain N.C..,Di Luca A..,...&Luo J.-J..(2020).Assessing the role of the ocean–atmosphere coupling frequency in the western Maritime Continent rainfall.Climate Dynamics,54.
MLA	Li Y.,et al."Assessing the role of the ocean–atmosphere coupling frequency in the western Maritime Continent rainfall".Climate Dynamics 54(2020).