中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Modeling the effects of irrigation on land surface fluxes and states over the conterminous United States: Sensitivity to input data and model parameters

文献类型:SCI/SSCI论文

作者Leng G. Y. ; Huang M. Y. ; Tang Q. H. ; Sacks W. J. ; Lei H. M. ; Leung L. R.
发表日期2013
关键词irrigation CLM4 uncertainties river-basins water-vapor high-plains temperature climate summer areas map us precipitation
英文摘要Previous studies on irrigation impacts on land surface fluxes/states were mainly conducted as sensitivity experiments, with limited analysis of uncertainties from the input data and model irrigation schemes used. In this study, we calibrated and evaluated the performance of irrigation water use simulated by the Community Land Model version 4 (CLM4) against observations from agriculture census. We investigated the impacts of irrigation on land surface fluxes and states over the conterminous United States (CONUS) and explored possible directions of improvement. Specifically, we found large uncertainty in the irrigation area data from two widely used sources and CLM4 tended to produce unrealistically large temporal variations of irrigation demand for applications at the water resources region scale over CONUS. At seasonal to interannual time scales, the effects of irrigation on surface energy partitioning appeared to be large and persistent, and more pronounced in dry than wet years. Even with model calibration to yield overall good agreement with the irrigation amounts from the National Agricultural Statistics Service, differences between the two irrigation area data sets still dominate the differences in the interannual variability of land surface responses to irrigation. Our results suggest that irrigation amount simulated by CLM4 can be improved by calibrating model parameter values and accurate representation of the spatial distribution and intensity of irrigated areas. Furthermore, through a set of numerical experiments, the deficiency in the current parameterization is evaluated and a critical path forward to a realistic assessment of irrigation impacts using an earth system modeling approach is recommended.
出处Journal of Geophysical Research-Atmospheres
118
17
9789-9803
收录类别SCI
语种英语
ISSN号2169-897X
源URL[http://ir.igsnrr.ac.cn/handle/311030/30462]  
专题地理科学与资源研究所_历年回溯文献
推荐引用方式
GB/T 7714
Leng G. Y.,Huang M. Y.,Tang Q. H.,et al. Modeling the effects of irrigation on land surface fluxes and states over the conterminous United States: Sensitivity to input data and model parameters. 2013.

入库方式: OAI收割

来源:地理科学与资源研究所

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