Selection of Onthespot Calibration Time Interval for Various Meteorologica l Elements of AWS
On the basis of the 9month observational data from five representative AWS in 2005, daily extremum distributions of main meteorological elements were obtained by the statistical method. Calibration period of various meteorological element s is studied by analyzing calibration time span and data transmitting schedule. The results show that the optimal calibration period of various meteorological e lements is as follows: humidity:8:00-11:00, fleet soil temperature:14:00-17:30, deepseated soil temperature:8:00-11:30, wind direction and wind speed:8:00 -9:3 0 or 16:30-18:00, barometric pressure:11:00-12:30,evaporation:8:00-8:30 or 17:30 -18:00. These results will help to revise the schedule of onthespot calibra tion of AWS, and reduce the influence of calibration operation on AWS observatio n.