DOI: 10.1007/s00382-017-3811-x
Scopus记录号: 2-s2.0-85026489702
论文题名: Influence of Lake Malawi on regional climate from a double-nested regional climate model experiment
作者: Diallo I. ; Giorgi F. ; Stordal F.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-09-10 起始页码: 3397
结束页码: 3411
语种: 英语
英文关键词: Lake Malawi
; Lake modeling
; Lake–atmosphere interactions
; Rainfall
; RegCM4
; Regional climate model
Scopus关键词: air temperature
; air-water interaction
; climate modeling
; lake
; numerical model
; performance assessment
; rainfall
; regional climate
; East African Lakes
; Lake Malawi
英文摘要: We evaluate the performance of the regional climate model (RCM) RegCM4 coupled to a one dimensional lake model for Lake Malawi (also known as Lake Nyasa in Tanzania and Lago Niassa in Mozambique) in simulating the main characteristics of rainfall and near surface air temperature patterns over the region. We further investigate the impact of the lake on the simulated regional climate. Two RCM simulations, one with and one without Lake Malawi, are performed for the period 1992–2008 at a grid spacing of 10 km by nesting the model within a corresponding 25 km resolution run (“mother domain”) encompassing all Southern Africa. The performance of the model in simulating the mean seasonal patterns of near surface air temperature and precipitation is good compared with previous applications of this model. The temperature biases are generally less than 2.5 °C, while the seasonal cycle of precipitation over the region matches observations well. Moreover, the one-dimensional lake model reproduces fairly well the geographical pattern of observed (from satellite measurements) lake surface temperature as well as its mean month-to-month evolution. The Malawi Lake-effects on the moisture and atmospheric circulation of the surrounding region result in an increase of water vapor mixing ratio due to increased evaporation in the presence of the lake, which combines with enhanced rising motions and low-level moisture convergence to yield a significant precipitation increase over the lake and neighboring areas during the whole austral summer rainy season. © 2017, Springer-Verlag GmbH Germany. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109341
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Department of Geography, University of California, Los Angeles (UCLA), Los Angeles, CA 90095, United States; Earth System Physics Section, The Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, 34151, Italy; Department of Geosciences, University of Oslo, Blindern, Box 1047, Oslo, 0316, Norway
Recommended Citation:
Diallo I.,Giorgi F.,Stordal F.. Influence of Lake Malawi on regional climate from a double-nested regional climate model experiment[J]. Climate Dynamics,2018-01-01,50(2018-09-10)