DOI: 10.1175/JCLI-D-13-00463.1
Scopus记录号: 2-s2.0-84906861472
论文题名: Regional model simulations of the 2008 drought in southern South America using a consistent set of land surface properties
作者: Müller O.V. ; Berbery E.H. ; Alcaraz-Segura D. ; Ek M.B.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 17 起始页码: 6754
结束页码: 6778
语种: 英语
Scopus关键词: Drought
; Rain
; Soil moisture
; Surface measurement
; Surface roughness
; Vegetation
; Weather forecasting
; Biophysical properties
; Functional properties
; Land surface modeling
; Land surface properties
; Southern south america
; Temperature simulations
; Vegetation greenness
; Weather research and forecasting
; Computer simulation
英文摘要: This work discusses the land surface-atmosphere interactions during the severe drought of 2008 in southern SouthAmerica, which was among themost severe in the last 50 years in terms of both intensity and extent.Once precipitation returned to normal values, it took about two months for the soil moisture content and vegetation to recover. The land surface effects were examined by contrasting long-term simulations using a consistent set of satellite-derived annually varying land surface biophysical properties against simulations using the conventional land-cover types in the Weather Research and Forecasting Model-Noah land surface model (WRF-Noah). The new land-cover dataset is based on ecosystem functional properties that capture changes in vegetation status due to climate anomalies and land-use changes. The results show that the use of realistic information of vegetation states enhances the model performance, reducing the precipitation biases over the drought region and over areas of excessive precipitation. The precipitation bias reductions are attributed to the corresponding changes in greenness fraction, leaf area index, stomatal resistance, and surface roughness. The temperature simulation shows a generalized increase, which is attributable to a lower vegetation greenness and a doubling of the stomatal resistance that reduces the evapotranspiration rate. The increase of temperature has a beneficial effect toward the eastern part of the domain with a notable reduction of the bias, but not over the central region where the bias is increased. The overall results suggest that an improved representation of the surface processes may contribute to improving the predictive skill of the model system. © 2014 American Meteorological Society. 资助项目: NSF, National Aeronautics and Space Administration
; NASA, National Aeronautics and Space Administration
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51343
Appears in Collections: 气候变化事实与影响
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作者单位: CEVARCAM, Facultad de Ingenieriá y Ciencias Hídricas, Universidad Nacional del Litoral and CONICET, Santa Fe, Argentina; Cooperative Institute for Climate and Satellites-Maryland, Earth System Science Interdisciplinary Center, University of Maryland, College Park, College Park, MD, United States; Departamento de Botánica, Campus de Fuente Nueva, Universidad de Granada, Granada, Spain; Environmental Modeling Center, NOAA/NCEP/NWS, College Park, MD, United States
Recommended Citation:
Müller O.V.,Berbery E.H.,Alcaraz-Segura D.,et al. Regional model simulations of the 2008 drought in southern South America using a consistent set of land surface properties[J]. Journal of Climate,2014-01-01,27(17)