台灣地區受到複雜地形的影響，在劇烈天氣現象所產生之強風或者降水，都明顯有多重尺度(multi-scale)與地形之交互作用。而在中、小尺度對流降水上，氣象雷達的觀測，在時空上皆提供高解析度的資訊。台灣目前與未來規劃之雷達網聯當中，將擁有不同波段之氣象雷達。透過不同頻道之雷達組成綿密的觀測網，對於發生於台灣地區之劇烈天氣現象，在遠程與中、短程範圍內皆可以有更好的掌握。尤其是利用較短波段的多顆雷達來填補因為複雜地形、以及近地面而不易觀測的區域，在監控與防災上會有很大的助益。更進一步，透過資料同化的方式，將即時的觀測資訊同化至數值模式當中，進而獲得劇烈天氣系統下之分析場，對於短期天氣預報將有實質的幫助。因此，本研究計畫的目的，主要在評估同化不同波段之氣象雷達觀測儀器，高密度的雷達資訊，在改善短期天氣預報在極端降水事件上的預報能力。同時協助2020年觀測實驗計畫當中，額外先進雷達之擺設位置以及掃描策略應該如何進行。藉由密集觀測實驗所帶來的先進雷達儀器，亦可作為台灣未來在中、小尺度氣象方面，儀器添購上之參考依據。 ;Taiwan is affected by complex terrains, where there is clearly a multi-scale interaction with terrain in strong winds and precipitation caused by severe weather events. In Mesoscale and convective-scale precipitation, the observation of meteorological radars provides high-resolution information both in space and time. The radar network of Taiwan in the near future will have different bands of weather radar. The dense observation network formed by radars of different channels can provide a better grasp of the severe weather phenomena that occur in Taiwan both in short- and long-range. In particular, the use of multiple radars in shorter wavelengths to fill areas that are difficult to detect because of complex terrain and near ground can be of great help in monitoring and preventing disasters. Furthermore, by assimilating radar observational into numerical models and obtaining optimal analysis under severe weather systems will be of substantial help to very short-term forecast. The purpose of this research is to evaluate and assimilate high-density radar information in different bands to improve very short-term forecast on severe weather events. At the same time, we will assist the field experiment in 2020 to survey the location of additional advanced radars. In addition, how the scanning strategy should be carried out. The advanced radar equipment brought by intensive observation experiments can also serve as a reference for Taiwan's future acquisitions of Mesoscale and convective-scale meteorology.
