气候变化领域集成服务门户(CCPortal): The diurnal cycle of rainfall and the convectively coupled equatorial waves over the maritime continent

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DOI	10.1175/JCLI-D-19-0043.1
	The diurnal cycle of rainfall and the convectively coupled equatorial waves over the maritime continent
	Sakaeda N.; Kiladis G.; Dias J.
发表日期	2020
ISSN	0894-8755
起始页码	3307
结束页码	3331
卷号	33 期号:8
英文摘要	Precipitation variability over the Maritime Continent is predominantly explained by its diurnal cycle and large-scale disturbances such as the Madden-Julian oscillation (MJO) and convectively coupled equatorial waves (CCEWs). To advance our understanding of their interactions and physical processes, this study uses satellite data to examine changes in the diurnal cycle of rainfall associated with the MJO and CCEWs over the Maritime Continent. We find that diurnal cycle modulations associated with the passage of any type of large-scale disturbance are closely tied to changes in rain types and land-sea diurnal propagation of rainfall. When the amplitude of the diurnal cycle increases over the islands, the phase of the diurnal cycle is delayed by a few hours as clouds are more organized and rainfall from stratiform-anvil clouds increases. Enhanced amplitude of the diurnal cycle can alter the speed of land- sea diurnal propagation of rainfall, which then influences the timing of diurnal rainfall over coastal regions. These changes in the diurnal cycle occur asymmetrically across the island terrain associated with the MJO and equatorial Rossby waves, while such asymmetric modulations are not observed for other waves. Geographical and wave dependencies of the diurnal cycle are linked to differences in large-scale lower tropospheric wind, vertical motion, and moisture profile perturbations, which are in turn tied to differences in cloud population evolution. The results of this study highlight the importance of further improving our understanding of the sensitivity of cloud populations to varying large-scale phenomena. © 2020 American Meteorological Society.
英文关键词	Climatology; Landforms; Mechanical waves; Modulation; Asymmetric modulations; Equatorial Rossby waves; Madden-Julian oscillation; Maritime Continent; Moisture profiles; Population evolution; Precipitation variability; Tropospheric winds; Rain; atmospheric convection; diurnal variation; equatorial wave; Madden-Julian oscillation; marine atmosphere; precipitation assessment; rainfall; satellite data
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/171537
作者单位	School of Meteorology, University of Oklahoma, Norman, OK, United States; NOAA, Earth System Research Laboratory, Physical Sciences Division, Boulder, CO, United States
推荐引用方式 GB/T 7714	Sakaeda N.,Kiladis G.,Dias J.. The diurnal cycle of rainfall and the convectively coupled equatorial waves over the maritime continent[J],2020,33(8).
APA	Sakaeda N.,Kiladis G.,&Dias J..(2020).The diurnal cycle of rainfall and the convectively coupled equatorial waves over the maritime continent.Journal of Climate,33(8).
MLA	Sakaeda N.,et al."The diurnal cycle of rainfall and the convectively coupled equatorial waves over the maritime continent".Journal of Climate 33.8(2020).