Abstract：According to compare the tests made in Zhengzhou national reference observation weather station during a 2-year field experiment,the performance and difference between thermometer screens and ventilation radiation shield are comparative analyzed.The tests demonstrate that the relatively large differences are presented due to structural,volume and ventilation differences.The high temperature on the days show that tref>t>tasp.The low temperature at night show that tasp>tref>t.The daily average temperature show that tref>tasp.This comparative experiment might be significance for improving future air temperature observation in China..
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