气候变化领域集成服务门户(CCPortal): Twice-Daily Monsoon Precipitation Maxima in the Himalayas Driven by Land Surface Effects

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DOI	10.1029/2020JD034255
	Twice-Daily Monsoon Precipitation Maxima in the Himalayas Driven by Land Surface Effects
	Fujinami H.; Fujita K.; Takahashi N.; Sato T.; Kanamori H.; Sunako S.; Kayastha R.B.
发表日期	2021
ISSN	2169897X
卷号	126 期号:13
英文摘要	The diurnal cycle of precipitation is important to the hydroclimate in the Himalayas in summer; however, features of the diurnal cycle that affect precipitation from the foothills to glacierized, high-elevation areas are poorly understood. We investigated the diurnal cycle of precipitation using 3 years of in situ observations recorded close to a glacier at 4,806 m asl, and 17 years of data from the Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR) and the Integrated Multi-satellitE Retrieval for Global Precipitation Measurement (IMERG). The mechanisms that drive the diurnal cycle were examined using hourly European Center for Medium-Range Weather Forecasts Re-Analysis fifth generation (ERA5) data. In situ observations showed that the diurnal precipitation cycle has daytime and nighttime peaks, which both consist of high rainfall frequency and low rainfall intensity. In addition, twice-daily maxima exist in the TRMM PR data, particularly over two rain bands at around 500–1,000 m asl, and at ∼2,000 m asl. Convective-type rainfall, with a lower rain-top height, occurs in the daytime, whereas stratiform-type rain, with a higher rain-top height, occurs at night, particularly over terrain at elevations above ∼1,500 m asl. Land surface processes likely cause the two peaks in the diurnal cycle. Daytime surface heating drives upslope flows that promote condensation. At night, surface cooling over the plain to the south of the Himalayas causes low-level monsoon flows to accelerate, creating a nocturnal jet, which results in large-scale moisture flux convergence over the southern slopes. © 2021. The Authors.
英文关键词	diurnal cycle; land surface processes; precipitation; summer monsoon; the Himalayas
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/185124
作者单位	Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan; Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan; Faculty of Environmental Earth Science, Hokkaido University, Sapporo, Japan; Now at Snow and Ice Research Center, National Research Institute for Earth Science and Disaster Resilience, Nagaoka, Japan; Himalayan Cryosphere, Climate and Disaster Research Center, Department of Environmental Science and Engineering, School of Science, Kathmandu University, Dhulikhel, Nepal
推荐引用方式 GB/T 7714	Fujinami H.,Fujita K.,Takahashi N.,et al. Twice-Daily Monsoon Precipitation Maxima in the Himalayas Driven by Land Surface Effects[J],2021,126(13).
APA	Fujinami H..,Fujita K..,Takahashi N..,Sato T..,Kanamori H..,...&Kayastha R.B..(2021).Twice-Daily Monsoon Precipitation Maxima in the Himalayas Driven by Land Surface Effects.Journal of Geophysical Research: Atmospheres,126(13).
MLA	Fujinami H.,et al."Twice-Daily Monsoon Precipitation Maxima in the Himalayas Driven by Land Surface Effects".Journal of Geophysical Research: Atmospheres 126.13(2021).