講演情報
[AAS15-P10]長崎での水蒸気ライダー(DIAL)観測に向けた開発・調整と初期観測結果
*西橋 政秀1、及川 栄治1、永井 智広1、酒井 哲1、吉田 智1、内野 修1、阿保 真2 (1.気象庁気象研究所、2.東京都立大学)
キーワード：
水蒸気ライダー、DIAL、線状降水帯
We have been developing a compact diode-laser-based differential absorption lidar (DIAL) to observe the vertical profiles of water vapor up to altitudes of 3-4 km throughout the day and night. This objective is to improve the forecast skill of localized torrential rainfall associated with stationary linear mesoscale convective systems (SLMCSs), which are called "Senjo-Kousuitai" in Japan.
We have focused on improving the transmittance of the receiving spectrometer, increasing and stabilizing the transmitted laser power, and improving the adjustment processes of the DIAL. In order to adjust and evaluate the DIAL, experimental observations were conducted from May to July 2025 at the Meteorological Research Institute (MRI) in Tsukuba. The vertical profiles of water vapor concentration observed with the DIAL corresponded closely with the radiosonde observations at Tateno, and the JMA Meso-scale Analysis values over the MRI also matched the DIAL observations.
After the experimental observations, a field observation campaign was conducted in Nagasaki from July 21 to October 27, 2025. Nagasaki is an optimal location for the observation of the vertical profiles of water vapor inflowing from the East China Sea, which has the potential to trigger SLMCS. For approximately three months during the summer, the DIAL operated almost stably. Multiple SLMCSs occurred in Kyushu from August to September 2025. Although there were some adjustment issues of the DIAL, the vertical profiles of water vapor during that period were observed. We will present the details of the observation results in Nagasaki and recent functional improvements to the DIAL.
We have focused on improving the transmittance of the receiving spectrometer, increasing and stabilizing the transmitted laser power, and improving the adjustment processes of the DIAL. In order to adjust and evaluate the DIAL, experimental observations were conducted from May to July 2025 at the Meteorological Research Institute (MRI) in Tsukuba. The vertical profiles of water vapor concentration observed with the DIAL corresponded closely with the radiosonde observations at Tateno, and the JMA Meso-scale Analysis values over the MRI also matched the DIAL observations.
After the experimental observations, a field observation campaign was conducted in Nagasaki from July 21 to October 27, 2025. Nagasaki is an optimal location for the observation of the vertical profiles of water vapor inflowing from the East China Sea, which has the potential to trigger SLMCS. For approximately three months during the summer, the DIAL operated almost stably. Multiple SLMCSs occurred in Kyushu from August to September 2025. Although there were some adjustment issues of the DIAL, the vertical profiles of water vapor during that period were observed. We will present the details of the observation results in Nagasaki and recent functional improvements to the DIAL.