气候变化领域集成服务门户(CCPortal): Influences of Lake Malawi on the spatial and diurnal variability of local precipitation

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DOI	10.5194/hess-23-2795-2019
	Influences of Lake Malawi on the spatial and diurnal variability of local precipitation
	Koseki S.; Mooney P.A.
发表日期	2019
ISSN	1027-5606
起始页码	2792
结束页码	2812
卷号	23 期号:7
英文摘要	We investigate how the intensity and spatial distribution of precipitation vary around Lake Malawi on a diurnal timescale, which can be valuable information for water resource management in tropical south-eastern African nations. Using a state-of-the-art satellite product and regional atmospheric model, the well-defined diurnal cycle is detected around Lake Malawi with harmonic and principle component analyses: the precipitation is intense during midnight to morning over Lake Malawi and the precipitation peaks in the daytime over the surrounding area. This diurnal cycle in the precipitation around the lake is associated with the lake-land breeze circulation. Comparisons between the benchmark simulation and an idealized simulation in which Lake Malawi is removed reveal that the diurnal variations in precipitation are substantially amplified by the presence of Lake Malawi. This is most evident over the lake and surrounding coastal regions. Lake Malawi also enhances the lake-land breeze circulation; the nocturnal lakeward land breeze generates surface convergence effectively and precipitation intensifies over the lake. Conversely, the daytime landward lake breeze generates the intense divergence over the lake and precipitation is strongly depressed over the lake. The lake-land breeze and the background vapour enriched by Lake Malawi drive primarily a diurnal variation in the surface moisture flux divergence/convergence over the lake and surrounding area which contributes to the diurnal cycle of precipitation in this region. © 2019. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	Information management; Principal component analysis; Water management; Atmospheric model; Diurnal variability; Diurnal variation; Principle component analysis; Satellite products; State of the art; Surface moistures; Waterresource management; Lakes; air-water interaction; atmospheric circulation; atmospheric modeling; diurnal variation; land breeze; precipitation (climatology); precipitation intensity; resource management; spatial distribution; spatial variation; water resource; East African Lakes; Lake Malawi
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159654
作者单位	Koseki, S., Geophysical Institute, University of Bergen, Bjerknes Centre for Climate Research, Bergen, Norway; Mooney, P.A., NORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway
推荐引用方式 GB/T 7714	Koseki S.,Mooney P.A.. Influences of Lake Malawi on the spatial and diurnal variability of local precipitation[J],2019,23(7).
APA	Koseki S.,&Mooney P.A..(2019).Influences of Lake Malawi on the spatial and diurnal variability of local precipitation.Hydrology and Earth System Sciences,23(7).
MLA	Koseki S.,et al."Influences of Lake Malawi on the spatial and diurnal variability of local precipitation".Hydrology and Earth System Sciences 23.7(2019).