DOI: 10.5194/hess-23-2795-2019
论文题名: Influences of Lake Malawi on the spatial and diurnal variability of local precipitation
作者: Koseki S. ; Mooney P.A.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2019
卷: 23, 期: 7 起始页码: 2792
结束页码: 2812
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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162944
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
Koseki S.,Mooney P.A.. Influences of Lake Malawi on the spatial and diurnal variability of local precipitation[J]. Hydrology and Earth System Sciences,2019-01-01,23(7)