臺灣南部弱綜觀海陸風無人機觀測(1/2)

Many researches showed that the distribution of air pollution and the timing, strength of precipitation can be affected by land-sea breeze in Taiwan. Land-sea breeze coupling with large-scale environmental wind would affect the distribution of precipitation. Most of studies of land-sea breeze were based on the results from surface observation or model simulation, on the other hand, the observation evidences of vertical structure are limited. Therefore, to resolve the vertical structure of atmosphereby using Unmanned Aircraft System (UAS) might be a new direction. Advantages of UAS includes a higher payload and higher spatial-temporal resolution as compared with traditional sounding balloons. The proposed project will use UAS to observe atmospheric profile and study the typical diurnal change of land-sea breeze under weak synoptic weather condition in southern Taiwan. The new strategy of UAV (unmanned aerial vehicle) observation is hoping to be a consultation of weather monitoring and weather forecast in the future.For the detailed proposal, first of all, our team are going to analyze historical observation data, reanalysis data, and modeling data to examine the features of land-sea breeze over southern Taiwan, and make a better observing strategies according to the analysis. Three spots synchronous day-night UAV observations will be carried over Tainan during intensive observing periods. By the integration of UAV, sounding balloon, and ground station observation data, we can get the whole picture of the land-sea breeze over southern Taiwan under weak-synoptic weather condition. As of the final report of this year, an intensive observation experiment for sea and land breeze has been completed, in which 87 UAV vertical profiles have been obtained. Based on the observational data set, the 3D characteristics of sea and land breeze and the impact on the transmission of air pollutants have been analyzed. The onset and vertical structure of sea breeze was observed. We also found the relationship between PM2.5, specific humidity and sea breeze front. Thoughtout the field experiment, we have identified the best season and best location for the land-sea breeze observation in Tainanm which will be benefit to the furture plan for operational measurement of land-sea breeze circulations in the CWB network.