DOI: 10.1007/s00382-012-1299-y
Scopus记录号: 2-s2.0-84860326761
论文题名: Examining evapotranspiration trends in Africa
作者: Marshall M. ; Funk C. ; Michaelsen J.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2012
卷: 38, 期: 2017-09-10 起始页码: 1849
结束页码: 1865
语种: 英语
英文关键词: Africa
; Climate change
; Evapotranspiration
; Land surface models
; VIC
英文摘要: Surface temperatures are projected to increase 3-4°C over much of Africa by the end of the 21st century. Precipitation projections are less certain, but the most plausible scenario given by the Intergovernmental Panel on Climate Change (IPCC) is that the Sahel and East Africa will experience modest increases (~5%) in precipitation by the end of the 21st century. Evapotranspiration (Ea) is an important component of the water, energy, and biogeochemical cycles that impact several climate properties, processes, and feedbacks. The interaction of Ea with climate change drivers remains relatively unexplored in Africa. In this paper, we examine the trends in Ea, precipitation (P), daily maximum temperature (Tmax), and daily minimum temperature (Tmin) on a seasonal basis using a 31 year time series of variable infiltration capacity (VIC) land surface model (LSM) Ea. The VIC model captured the magnitude, variability, and structure of observed runoff better than other LSMs and a hybrid model included in the analysis. In addition, we examine the inter-correlations of Ea, P, Tmax, and Tmin to determine relationships and potential feedbacks. Unlike many IPCC climate change simulations, the historical analysis reveals substantial drying over much of the Sahel and East Africa during the primary growing season. In the western Sahel, large increases in daily maximum temperature appear linked to Ea declines, despite modest rainfall recovery. The decline in Ea and latent heating in this region could lead to increased sensible heating and surface temperature, thus establishing a possible positive feedback between Ea and surface temperature. © 2012 Springer-Verlag. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/55314
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Geography, Climate Hazards Group, University of California Santa Barbara, Santa Barbara, CA, United States; US Geological Survey Earth Resources Observation and Science (EROS) Center, Department of Geography, University of California Santa Barbara, Santa Barbara, CA, United States
Recommended Citation:
Marshall M.,Funk C.,Michaelsen J.. Examining evapotranspiration trends in Africa[J]. Climate Dynamics,2012-01-01,38(2017-09-10)