Asian monsoon variabilty and water resoures

泰国Gewex亚洲季风试验（GAME）的集中观察期（IOP）为1998年，在泰国旱季（1 - 3月）进行了野外试验；(1)在马来西亚Sarawaku热带雨林树塔、泰国Kog Ma热带干燥森林50m塔、素可泰市附近120m塔和稻田20m桅杆上进行地表热平衡密集观测。由于稻田土壤干燥，潜热通量受到抑制，可以利用土壤水分测量来预测潜热通量。(2)利用行星边界层大气廓线估算了EGAT塔站周围非均匀区域的区域蒸发量。通过与地面通量的比较，讨论了地表参数的聚集性。(3)泰国5个站点GPS观测资料反演的可降水量精度较差，均方根误差为9mm。但经过对上层探空的严格质量检查，提高到6mm以下。(4)在水田站和EGAT塔周围进行与卫星同步的田间试验。在旱季中期的3月，土壤水分样本在大约公里范围内采集，其含量几乎在1%到2%之间。(5)研究会议，分享IOP和日常数据，讨论未来计划。所有数据将根据游戏数据政策通过互联网公开。

Intensive Observation Period (IOP) Year of Gewex Asian Monsoon Experiments (GAME) in Thailand is 1998 and field experiments were conducted during the dry season in Thailand from January to March ; (1) surface heat balance intensive observations at a tree tower in Tropical rain forest, Sarawaku, Malaysia, at a 50m tower in Tropical dry forest, Kog Ma experimental station, Thailand, at a 120m tower near Sukhothai city and at a 20m mast in a paddy field. Latent heat flux is suppressed due to drying up the soil at the paddy field and it can be predicted using the soil moisture measurement.(2) Estimation of regional evaporation over a heterogeneous area around EGAT tower station are estimated using atmospheric profile of the planetary boundary layer. Through a comparison of the ground base flux with it, aggregation of the surface parameters are discussed.(3) Precipitable water vapor were retrieved from GPS observations at five station in Thailand and accuracy of the precipitable water is worse, the value of root mean square error is 9mm. However after strict quality check of the upper layer sonde sounding, it is improved up to less than 6mm.(4) Field experiments synchronized with satelites were conducted around paddy field stations and EGAT tower. Soil moisture samples are taken over some km range and its content is almost from one to two percentage in March, middle of the dry season.(5) Research meeting to share both IOP and routine data each other and to discuss a future plan. All data is decided to opened through the Internet along with the GAME data policy.