| 1 | Estimation of Summer Rainfall over an Arid Area using AMSR-E Measurements:A Case Study in Xinjiang,China显示文摘Rainfall estimate in arid region using passive microwave remote sensing techniques has been a complex issue for some time.The main reason for this difficulty is that the high and variable emissivity of land surfaces greatly aggravates the complexity of the signatures from the rain cloud.The Xinjiang area,located in the northwest of China,holds all the typical characteristics of arid climate.A rainfall algorithm has been developed for this region by using the Advanced Microwave Scanning Radiometer for Earth Observing System(AMSR-E) measurements.The algorithm attempts to use all 12 chan-nels on the AMSR-E instrument and a two-step method calibrated over 11 days of hourly rain-gauge data.First,Stepwise Discriminant Analysis(SDA) used to optimally estimate rain pixels based on all 12 channels,although only three channels were found to be necessary.Next,a rain predicator scattering index was used to estimate rain rates.A linear relationship between the rain rates and the scattering index above the threshold of 3.0K was constructed with a simple approximately linear function.The estimated rain rates were compared with the rain-gauge data used to calibrate the method,and a good relationship was found with a root-mean-square error of 2.1mm/h.The numerical calculations and comparisons show that the algorithm works well in the Xinjiang area. | Lei Wang1,Jun Wen1*,Wen Yang1,Hui Tian1,Tangtang Zhang1,Xiaokang Shi1,Xiehui Li2,Yizhou Zhao3,Yuan’an Jiang3,Yuanpeng Li3 1.Key Laboratory for Climate Environment and Disasters of Western China,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China 2.College of Resource and Environment,Key Laboratory of Western China’s Environmental Systems,MOE,Lanzhou University,Lanzhou Gansu 730000,China 3.Xinjiang Climate Center,Urumqi Xinjiang 830002,China | 2008 | Research in Cold and Arid Regions2008，，1： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员