Radiation and Energy Balance Monitoring

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Overall, 15 automatic weather stations were established and valuable energy balance data have been accumulated at carefully selected site in Siberia, Mongolia, China, Tibet, and Thailand. As a result of station deployment in geographically very different locations, difference in variations of surface energy partition regime, both in time and in magnitude were obtained. Also, comparisons of the surface fluxes obtained from one AAN surface station and from GAME and ECMWF reanalysis data were carried out and the results indicate very good agreement of the measurements and model derived values. Also, AAN data have been found useful for a model validation purposes, because AAN sites cover a wide range of geographical areas and climates, a comparison of any variables produced from a model or from a satellite against the AAN data sets should give opportunity for a thorough validation of these data (and, in turn, the model or the satellite measurements themselves). The SKYNET is a network of a … More sky radiometer and SKYNET sites are Sri Samrong (Thailand, since July 1997), Shou-Xian(China, until March 1999) /Hefei (China, from April 1999) A lidar, and a microwave radiometer were installed at Sri Samrong. The surface solar radiation was estimated from GMS visible and infrared radiance data and compared with the values observed at the GAME High Precision Radiation sites and SKYNET sites. Monthly mean values of the surface radiation flux in 1997, 1998, and 1999 are basically in good agreement with the observation. From the lidar monitoring, the cloud base height statistics was obtained. The AAN data have been checked and processed as they are provided from each station for archiving at the AAN data center at Terrestrial Environment Research Center of the University of Tsukuba, and are open to the scientific communities through the AAN web site at http://www.suiri.tsukuba.ac.jp/Project/aan/aan.html. Also a CD-ROM version has been produced for distribution to the countries without easy access to the data center. Less