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ミリ波雲レーダFALCON-Iの開発 ： 現状と展望
鷹野, 敏明;高村, 民雄
Permalink : http://hdl.handle.net/2115/55058
Abstract
地球温暖化に影響を与える高層の薄い雲を調べるには, 周波数の高い電波を用いるレーダによる観測が適している. 気象観測でこれまでに使用されている最も高い周波数95GHzを用いた千葉大学ミリ波雲レーダFALCON-Iは, 高い感度と空間・時間分解能を備えている. FALCON-Iの概要と観測例, 雲底からの降雨が約200m落下して終端速度の到達する様子, 積乱雲の発達過程で上昇する雲の内部運動速度幅が10m/sに達している様子, 衛星搭載雲レーダとの同時観測で良い一致を示す例, などの結果を示し, 今後の展望を概観する.
Observation of clouds using high frequency radars is one of powerful methods for investigating thin and high-altitude clouds,which affect greenhouse effect. FALCON-I is a millimeter wave cloud profiling radar of Chiba University at 95 GHz, which is the highest frequency for normal meteorological use and has high sensitivity and spatial-, temporal-resolution. The system of FALCON-I and examples of observations are presented;accelerating rain drops to the terminal velocity in about 200m from the cloud bottom,Doppler velocity width reaches 10 m/s in cloudlets in ascending phase of a cumulonimbus, good correspondence of cloud profiles obtained FALCON-I and satellite observations, and so on. Future developments of FALCON are also mentioned.
Observation of clouds using high frequency radars is one of powerful methods for investigating thin and high-altitude clouds,which affect greenhouse effect. FALCON-I is a millimeter wave cloud profiling radar of Chiba University at 95 GHz, which is the highest frequency for normal meteorological use and has high sensitivity and spatial-, temporal-resolution. The system of FALCON-I and examples of observations are presented;accelerating rain drops to the terminal velocity in about 200m from the cloud bottom,Doppler velocity width reaches 10 m/s in cloudlets in ascending phase of a cumulonimbus, good correspondence of cloud profiles obtained FALCON-I and satellite observations, and so on. Future developments of FALCON are also mentioned.
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