气候变化领域集成服务门户(CCPortal): Oceanic Impacts on MJOs Detouring near the Maritime Continent

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DOI	10.1175/JCLI-D-19-0505.1
	Oceanic Impacts on MJOs Detouring near the Maritime Continent
	Zhou L.; Murtugudde R.
发表日期	2020
ISSN	0894-8755
起始页码	2371
结束页码	2388
卷号	33 期号:6
英文摘要	Madden–Julian oscillations (MJOs) are the dominant mode of intraseasonal variability (ISV) in the atmosphere acting as a bridge between weather and climate. During boreal winter, many MJO events are detoured southward while propagating across the Maritime Continent. Although MJO simulations have been greatly improved in recent years, the mechanism and simulation of MJO detouring near the Maritime Continent are still a great scientific challenge. Several mechanisms have been proposed based on atmospheric dynamics and thermodynamics. In this study, the oceanic role in MJO detouring is diagnosed using observations and reanalysis products. It is found that warm sea surface temperature (SST) anomalies occur over the southeastern Indian Ocean that induce a cyclone in the lower troposphere. Due to the westerly background winds, westerly winds are strengthened (weakened) to the north (south) of warm SST anomalies. As a result, the latent heat flux (LHF) is enhanced, and convection is reinforced to the north of warm SST anomalies. In contrast, the LHF is reduced, and SSTs warm to the south of pre-existing warm SST anomalies. Hence, the warm SST anomalies and convection system shift the MJOs southward before they reach the Maritime Continent. The identification of the oceanic influence on the MJO detouring deepens our understanding of the mechanism of their detour and elicits the role of the ocean. It is expected to brighten the prospects for better simulation and forecast of MJOs over the Maritime Continent. The oceanic ISV in the southeastern Indian Ocean is subject to many forcings, such as intraseasonal atmospheric forcing, the Indonesian Throughflow, local oceanic instability, and coastal Kelvin waves along Sumatra. Determining the mechanism of ISV in the southeastern Indian Ocean requires further dedicated studies. © 2020 American Meteorological Society.
英文关键词	Climatology; Heat flux; Storms; Surface waters; Atmospheric dynamics and thermodynamics; Atmospheric forcing; Background winds; Convection systems; Indonesian throughflow; Intraseasonal variability; Lower troposphere; Maritime Continent; Oceanography; air-sea interaction; atmospheric dynamics; atmospheric forcing; Kelvin wave; latent heat flux; Madden-Julian oscillation; sea surface temperature; seasonal variation; temperature anomaly; Greater Sunda Islands; Indian Ocean; Indian Ocean (Southeast); Sumatra; Sunda Isles
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171400
作者单位	School of Oceanography, Shanghai Jiao Tong University, Shanghai, China; Southern Marine Science and Engineering Guangdong Laboratory, Zhuhai, China; University of Maryland, College Park, College Park, MD, United States
推荐引用方式 GB/T 7714	Zhou L.,Murtugudde R.. Oceanic Impacts on MJOs Detouring near the Maritime Continent[J],2020,33(6).
APA	Zhou L.,&Murtugudde R..(2020).Oceanic Impacts on MJOs Detouring near the Maritime Continent.Journal of Climate,33(6).
MLA	Zhou L.,et al."Oceanic Impacts on MJOs Detouring near the Maritime Continent".Journal of Climate 33.6(2020).