Abstract
The time variation of astroclimate conditions in China was analyzed in terms of cloud cover,air temperature,wind speed,water vapor pressure,and precipitation.The databases from ground meteorological stations over China were employed with the yearly and monthly data sets for the period of 1951-2008.According to the climate regionalization for astronomical observations,21 stations were selected based on their advantages for astronomical observations,the locations nearby existing/candidate observatories,or the climatologically representative of local regions.The long-term trend,annual and diurnal variability of the relevant meteorological factors were summarized and compared for the 21 local regions,providing ground-truth evidence for selecting and further evaluating an astronomical site.This study serves as a further demonstration towards astroclimate regionalization,and provides with essential database for astronomical site survey in China.
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