气候变化领域集成服务门户(CCPortal): Effects of high-frequency surface wind on the intraseasonal SST associated with the Madden-Julian oscillation

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DOI	10.1007/s00382-020-05239-w
	Effects of high-frequency surface wind on the intraseasonal SST associated with the Madden-Julian oscillation
	Gao Y.; Hsu P.-C.; Chen L.; Wang L.; Li T.
发表日期	2020
ISSN	0930-7575
起始页码	4485
结束页码	4498
卷号	54
英文摘要	The effect of high-frequency (< 20 days) wind on the intraseasonal sea surface temperature (SST) anomaly associated with the Madden-Julian oscillation (MJO) is examined by diagnosing reanalysis and outputs from a set of oceanic general circulation model (OGCM) experiments. Warm SST anomaly (SSTA) ahead of MJO convective center induces anomalous boundary-layer convergence, favoring the eastward propagation of the MJO. To understand the key physical processes contributing to the warm SSTA, the mixed-layer heat budget equation is diagnosed. The time change of SSTA (∂〈 T〉 / ∂t) mostly comes from shortwave radiative heating, while latent heat flux (LHF) plays the secondary role. Due to the strong nonlinearity of LHF, the high-frequency (< 20 days) wind may affect the intraseasonal LHF variability via interacting with the background state, resulting in changes in intraseasonal SSTA. Our diagnosis shows that the upscale feedback associated with high-frequency wind variability accounts for around 23% of the intraseasonal LHF in the intraseasonal SST warming region, supporting the growth of ∂〈 T〉 / ∂t. Sensitivity experiments are then designed using an OGCM that simulates the upper-ocean temperature well, to verify the high-frequency wind effect on the intraseasonal SST variability. Once the high-frequency component of surface winds is removed in the model integration, the amplitudes of intraseasonal LHF and ∂〈 T〉 / ∂t are decreased, leading to reduced SSTA. The modeling results confirm the positive role of high-frequency wind in supporting the tropical intraseasonal SST variation. The findings of this study suggest that an accurate representation of high-frequency disturbances and their interaction with other components are crucial for MJO simulation and prediction. © 2020, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Air–sea interaction; High-frequency wind; Madden-Julian oscillation; Scale interaction; Sea surface temperature
语种	英语
scopus关键词	air-sea interaction; heat budget; Madden-Julian oscillation; oceanic general circulation model; sea surface temperature; seasonal variation; surface wind
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/145473
作者单位	Key Laboratory of Meteorological Disaster of Ministry of Education/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters/NUIST-UoR International Research Institute, Nanjing University of Information Science and Technology, Nanjing, China; School of Ecology and Environment, Inner Mongolia University, Hohhot, China; LASG, Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences (CAS), Beijing, China; International Pacific Research Center, University of Hawaii at ManoaHI, United States
推荐引用方式 GB/T 7714	Gao Y.,Hsu P.-C.,Chen L.,et al. Effects of high-frequency surface wind on the intraseasonal SST associated with the Madden-Julian oscillation[J],2020,54.
APA	Gao Y.,Hsu P.-C.,Chen L.,Wang L.,&Li T..(2020).Effects of high-frequency surface wind on the intraseasonal SST associated with the Madden-Julian oscillation.Climate Dynamics,54.
MLA	Gao Y.,et al."Effects of high-frequency surface wind on the intraseasonal SST associated with the Madden-Julian oscillation".Climate Dynamics 54(2020).