DOI: 10.5194/hess-18-193-2014
Scopus记录号: 2-s2.0-84892614700
论文题名: Comparison of different evaporation estimates over the African continent
作者: Trambauer P ; , Dutra E ; , Maskey S ; , Werner M ; , Pappenberger F ; , Van Beek L ; P ; H ; , Uhlenbrook S
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2014
卷: 18, 期: 1 起始页码: 193
结束页码: 212
语种: 英语
Scopus关键词: Climate change assessment
; Evaporation products
; Hydrological modeling
; Hydrological models
; Land surface models
; Meteorological forcing
; Spatial resolution
; Water resources assessment
; Climate change
; Climate models
; Hydrology
; Stream flow
; Water management
; Weather forecasting
; Evaporation
; climate change
; comparative study
; computer simulation
; evaporation
; forecasting method
; hydrological modeling
; precipitation (climatology)
; spatial resolution
; streamflow
; uncertainty analysis
; water budget
; water management
; water resource
; Africa
英文摘要: Evaporation is a key process in the water cycle with implications ranging, inter alia, from water management to weather forecast and climate change assessments. The estimation of continental evaporation fluxes is complex and typically relies on continental-scale hydrological models or land-surface models. However, it appears that most global or continental-scale hydrological models underestimate evaporative fluxes in some regions of Africa, and as a result overestimate stream flow. Other studies suggest that land-surface models may overestimate evaporative fluxes. In this study, we computed actual evaporation for the African continent using a continental version of the global hydrological model PCR-GLOBWB, which is based on a water balance approach. Results are compared with other independently computed evaporation products: the evaporation results from the ECMWF reanalysis ERA-Interim and ERA-Land (both based on the energy balance approach), the MOD16 evaporation product, and the GLEAM product. Three other alternative versions of the PCR-GLOBWB hydrological model were also considered. This resulted in eight products of actual evaporation, which were compared in distinct regions of the African continent spanning different climatic regimes. Annual totals, spatial patterns and seasonality were studied and compared through visual inspection and statistical methods. The comparison shows that the representation of irrigation areas has an insignificant contribution to the actual evaporation at a continental scale with a 0.5 spatial resolution when averaged over the defined regions. The choice of meteorological forcing data has a larger effect on the evaporation results, especially in the case of the precipitation input as different precipitation input resulted in significantly different evaporation in some of the studied regions. ERA-Interim evaporation is generally the highest of the selected products followed by ERA-Land evaporation. In some regions, the satellite-based products (GLEAM and MOD16) show a different seasonal behaviour compared to the other products. The results from this study contribute to a better understanding of the suitability and the differences between products in each climatic region. Through an improved understanding of the causes of differences between these products and their uncertainty, this study provides information to improve the quality of evaporation products for the African continent and, consequently, leads to improved water resources assessments at regional scale. © 2014 Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/78351
Appears in Collections: 气候变化事实与影响
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作者单位: UNESCO-IHE, Department of Water Science and Engineering, P.O. Box 3015, 2601 DA Delft, Netherlands; ECMWF, Shinfield Park, RG2 9AX Reading, United Kingdom; Deltares, P.O. Box 177, 2600MH Delft, Netherlands; Utrecht University, Dept. Physical Geography, Utrecht, Netherlands; Delft University of Technology, Water Resources Section, P.O. Box 5048, 2600 GA Delft, Netherlands
Recommended Citation:
Trambauer P,, Dutra E,, Maskey S,et al. Comparison of different evaporation estimates over the African continent[J]. Hydrology and Earth System Sciences,2014-01-01,18(1)