DOI: 10.1175/JCLI-D-14-00565.1
Scopus记录号: 2-s2.0-84933280640
论文题名: The impact of the African Great Lakes on the regional climate
作者: Thiery W. ; Davin E.L. ; Panitz H.-J. ; Demuzere M. ; Lhermitte S. ; Van Lipzig N.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 10 起始页码: 4061
结束页码: 4085
语种: 英语
Scopus关键词: Atmospheric temperature
; Climate models
; Surface properties
; Community land models
; Convective inhibition
; East african climates
; Lake surface temperature
; Regional climate model simulation
; Satellite observations
; Spatiotemporal variability
; Turbulent heat transport
; Lakes
英文摘要: Although the African Great Lakes are important regulators for the East African climate, their influence on atmospheric dynamics and the regional hydrological cycle remains poorly understood. This study aims to assess this impact by comparing a regional climate model simulation that resolves individual lakes and explicitly computes lake temperatures to a simulation without lakes. The Consortium for Small-Scale Modelling model in climate mode (COSMO-CLM) coupled to the Freshwater Lake model (FLake) and Community Land Model (CLM) is used to dynamically downscale a simulation from the African Coordinated Regional Downscaling Experiment (CORDEX-Africa) to 7-km grid spacing for the period of 1999-2008. Evaluation of the model reveals good performance compared to both in situ and satellite observations, especially for spatiotemporal variability of lake surface temperatures (0.68-K bias), and precipitation (-116mmyr-1 or8% bias). Model integrations indicate that the four major African Great Lakes almost double the annual precipitation amounts over their surface but hardly exert any influence on precipitation beyond their shores. Except for Lake Kivu, the largest lakes also cool the annual near-surface air by-0.6 to-0.9Kon average, this time with pronounced downwind influence. The lake-induced cooling happens during daytime, when the lakes absorb incoming solar radiation and inhibit upward turbulent heat transport. At night, when this heat is released, the lakes warm the near-surface air. Furthermore, Lake Victoria has a profound influence on atmospheric dynamics and stability, as it induces circular airflow with over-lake convective inhibition during daytime and the reversed pattern at night. Overall, this study shows the added value of resolving individual lakes and realistically representing lake surface temperatures for climate studies in this region. © 2015 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50399
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth and Environmental Sciences, KU Leuven, Leuven, Belgium; Institute for Atmospheric and Climate Science, ETH Zürich, Zürich, Switzerland; Institute for Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, Germany
Recommended Citation:
Thiery W.,Davin E.L.,Panitz H.-J.,et al. The impact of the African Great Lakes on the regional climate[J]. Journal of Climate,2015-01-01,28(10)