气候变化领域集成服务门户(CCPortal): Diurnal Cycle of Precipitation Over the Maritime Continent Under Modulation of MJO: Perspectives From Cloud-Permitting Scale Simulations

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DOI	10.1029/2020JD032529
	Diurnal Cycle of Precipitation Over the Maritime Continent Under Modulation of MJO: Perspectives From Cloud-Permitting Scale Simulations
	Wei Y.; Pu Z.; Zhang C.
发表日期	2020
ISSN	2169897X
卷号	125 期号:13
英文摘要	Cloud-permitting scale (3 km) simulations are made to investigate the diurnal cycle of precipitation (DCP) over the Indo-Pacific Maritime Continent under the modulation of the Madden-Julian Oscillation (MJO), focusing on January–February 2018 during the Years of the Maritime Continent (YMC). Comparisons with satellite precipitation and global reanalysis products show that the simulations reasonably capture main features of diurnal wind and precipitation. The MJO modulates the amplitude, timing, and propagation of the DCP through affecting both large-scale and local circulation and convection. Under local suppressed conditions, much strengthened sea/valley breezes are generally responsible for the enhanced and earlier-triggered (2- to 3-hr lead) DCP over land. Meanwhile, stronger cooling induced by enhanced stratiform rainfall excites well-developed gravity waves spreading outward and upward, accompanied by continuous decreases in low-level temperature and amplified land breezes, which cause stronger and further offshore-propagating DCP. The opposite is true under local active conditions. Modulated by the passing of MJO, the enhanced DCP also displays a systematic shift from the west to the east coasts of large islands, forming a unique dipolar structure in the anomalous island DCP. The DCP exhibits island-dependent characteristics: With topographical elevation, the triggering mechanism of island convection transforms from later penetrating sea breeze fronts over mountain foothills to early-excited valley winds over mountain tops. Steep topography also supports stronger intraseasonal variations of the DCP, which can be well explained by regional variations in land-sea/mountain-valley breezes, terrain lifting, and ambient wind-induced advective and vertical wind shear effects. ©2020. The Authors.
英文关键词	cloud-permitting simulation; diurnal cycle of precipitation; MJO; tropical convection
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/185932
作者单位	Department of Atmospheric Sciences, University of Utah, Salt Lake City, UT, United States; NOAA Pacific Marine Environmental Laboratory, Seattle, WA, United States
推荐引用方式 GB/T 7714	Wei Y.,Pu Z.,Zhang C.. Diurnal Cycle of Precipitation Over the Maritime Continent Under Modulation of MJO: Perspectives From Cloud-Permitting Scale Simulations[J],2020,125(13).
APA	Wei Y.,Pu Z.,&Zhang C..(2020).Diurnal Cycle of Precipitation Over the Maritime Continent Under Modulation of MJO: Perspectives From Cloud-Permitting Scale Simulations.Journal of Geophysical Research: Atmospheres,125(13).
MLA	Wei Y.,et al."Diurnal Cycle of Precipitation Over the Maritime Continent Under Modulation of MJO: Perspectives From Cloud-Permitting Scale Simulations".Journal of Geophysical Research: Atmospheres 125.13(2020).