黄土高原半干旱雨养农田空气动力和热力参数分析

摘要

Based on data from the intensified observational period over spring wheat field area at the arid meteorology and ecological en-vironment experimental station in Dingxi of Gansu Province from June to August 2003,which is located in the semi-arid rain fed agri-cultural region of Loess Plateau,the aerodynamic roughness Z0m ,the thermodynamic roughness Z0h and the excess resistance to heat transfer kB-1 were calculated and analyzed,firstly.Then,the spatial distributions of Z0m and kB-1 over eastern part of northwest China were obtained,accompanied by vegetation index Indv and surface temperature Ts derived by satellite,respectively.The above parame-ters can be used to estimate the heterogeneous land surface energy flux.%利用甘肃省定西干旱气象与生态环境试验基地2003年夏季加强观测期间的资料，计算动量粗燥长度、热量粗糙长度和热量输送附加阻抗，结合卫星反演的差值植被指数In d v和表面温度Ts 将其推广到中国西北区东部，可用于计算非均匀地表能量通量。