气候变化领域集成服务门户(CCPortal): Transition of Low Clouds in the East China Sea and Kuroshio Region in Winter: A Regional Atmospheric Model Study

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DOI	10.1029/2020JD032509
	Transition of Low Clouds in the East China Sea and Kuroshio Region in Winter: A Regional Atmospheric Model Study
	Long J.; Wang Y.; Zhang S.; Liu J.
发表日期	2020
ISSN	2169897X
卷号	125 期号:17
英文摘要	Bias in simulating the stratocumulus-to-cumulus transition remains a main source of uncertainties in climate projection and can significantly affect the energy budget in climate models. To gain insights into the transition, this study investigates the cloud transition forced by the sea surface temperature (SST) front and synoptic disturbances in the East China Sea and Kuroshio region in winter based on both observations and regional atmospheric model simulations. The Kuroshio SST front greatly accelerates cloud transition by enhancing surface latent heat flux, marine atmospheric boundary layer (MABL) dynamical adjustment, and cloud top entrainment. With the sharp SST increase from the cold flank to the Kuroshio SST warm tongue (KWT), surface wind convergence (SWC) over the KWT induced by the SST front and synoptic disturbances enhances the coupling between the cloud layer and subcloud layer. An underlying positive feedback between the SWC and latent heating in the cloud layer can enhance abrupt change in cloud properties and maintain cloud band over the KWT against the decoupling through the so-called “Deepening-Warming” mechanism induced by latent heating. From the KWT downwind southward, the surface layer turbulent mixing weakens, while latent heating in the cloud layer and cloud top longwave radiative cooling enhance buoyancy and vertical mixing in the cloud layer. This difference in vertical mixing between the cloud layer and subcloud layer facilitates the MABL decoupling and impedes upward moisture transport. Meanwhile, decreasing lower tropospheric stability is conducive to the entrainment of drier and warmer air from above into the cloud layer, strengthening cloud evaporation. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	ensemble simulation; Kuroshio; low cloud transition; SST front; synoptic disturbances
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185778
作者单位	South China sea institute of marine and meteorology, College of ocean and meteorology, Guangdong Ocean University, Zhanjiang, China; Southern Marine Science and Engineering Guangdong Laboratory, Marine Resources Big Data Center of South China Sea, Zhanjiang, China; Physical Oceanography Laboratory and Ocean-Atmosphere Interaction and Climate Laboratory, Ocean University of China, Qingdao, China; International Pacific Research Center, and Department of Atmospheric Sciences, School of Ocean and Earth Science and Technology, University of Hawai‘i at Mānoa, Honolulu, HI, United States
推荐引用方式 GB/T 7714	Long J.,Wang Y.,Zhang S.,et al. Transition of Low Clouds in the East China Sea and Kuroshio Region in Winter: A Regional Atmospheric Model Study[J],2020,125(17).
APA	Long J.,Wang Y.,Zhang S.,&Liu J..(2020).Transition of Low Clouds in the East China Sea and Kuroshio Region in Winter: A Regional Atmospheric Model Study.Journal of Geophysical Research: Atmospheres,125(17).
MLA	Long J.,et al."Transition of Low Clouds in the East China Sea and Kuroshio Region in Winter: A Regional Atmospheric Model Study".Journal of Geophysical Research: Atmospheres 125.17(2020).