Asian monsoon variabilty and water resoures

Gewex亚洲季风实验(GAME)强化观测期(IOP)年是1998年，在泰国1-3月的旱季进行了野外实验：(1)在马来西亚沙捞越热带雨林的一个树塔、泰国Kog Ma实验站热带雨林50米的塔楼、素可泰(Sukhothai)市附近的120米塔楼和一块水田里20米的桅杆上进行了地面热平衡强化观测。由于水田土壤干燥，潜热通量受到抑制，可以通过土壤水分测量进行预测。(2)利用大气边界层廓线估算了EGAT塔站周围非均匀区域的区域蒸发量。(3)利用泰国5个测站的GPS观测资料反演可降水量，但其精度较差，均方根误差仅为9 mm。但经过对上层探空仪进行严格的质量检查后，测深提高到了6 mm以下。(4)在水田站和EGAT塔周围进行了与卫星同步的野外试验。在旱季中期的3月份，土壤水分样本被采集到一些公里范围内，其含量几乎在1%到2%之间。(5)相互分享IOP和常规数据并讨论未来计划的研究会议。随着游戏数据政策的实施，所有数据都决定通过互联网开放。

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.