Effects of Dynamic Crop Growth on the Simulated Precipitation Response to Irrigation*

Earth Interactions

Keith J.Harding¹ 

关键词: Vegetation–atmosphere interactions;    Precipitation;    Physical meteorology and climatology;    Water budget;    Models and modeling;    Coupled models;    Applications;    Agriculture;    Land use;   

DOI  :  10.1175/EI-D-15-0030.1

学科分类：地球科学(综合)

来源: American Geophysical Union

【 摘 要 】

AbstractThe rapid expansion of irrigation since the 1950s has significantly depleted the Ogallala Aquifer. This study examines the warm-season climate impacts of irrigation over the Ogallala using high-resolution (6.33 km) simulations of a version of the Weather Research and Forecasting (WRF) Model that has been coupled to the Community Land Model with dynamic crop growth (WRF-CLM4crop). To examine how dynamic crops influence the simulated impact of irrigation, the authors compare simulations with dynamic crops to simulations with a fixed annual cycle of crop leaf area index (static crops). For each crop scheme, simulations were completed with and without irrigation for 9 years that represent the range of observed precipitation. Reduced temperature and precipitation biases occur with dynamic versus static crops. Fundamental differences in the precipitation response to irrigation occur with dynamic crops, as enhanced surface roughness weakens low-level winds, enabling more water from irrigation to remain o...

【 授权许可】

Unknown