Development of Combined Remote-sensing Technique of Humidity Profiles

湿度剖面组合遥感技术的发展

基本信息

批准号：
14340140
负责人：
TSUDA Toshitaka
金额：
$ 9.47万
依托单位：
Kyoto University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

Humidity is the most important parameters to elucidate the detailed behavior of meteorological phenomena. However, a remote-sensing sensing technique to continuously monitor humidity profiles has not been fully available for practical use. In this study a new remote-sensing technique for water vapor profiling has been developed based on the humidity estimation technique with an atmosphere radar. The other remote sensing method, i.e. Raman lidar and GPS have been developed aimed at more precise estimation combining these data accordingly. The detail of the study is summarized as follows.1. Radar remote-sensing technique to estimate humidity profiles was developed using a correlation between the turbulent echo intensity with an atmosphere radar and vertical humidity gradient. In the method we also incorporated GPS precipitable water vapor data into the retrieval algorithm for a stable estimation. The humidity profiles with the MU radar-RASS successfully elucidated the detailed humidity s … More tructure in rain-clouds which had not been observed by other conventional techniques.2. A lidar system at the Shiraraki observatory was improved to detect rotation Raman signal to enable to monitor temperature and humidity profiles. The new system also inserted a narrow-band optical filter which allows us a daytime observation.3. The humidity estimation method developed with the MU radar was applied to a wind profiler radar, operated on L-band to monitor detailed humidity profiles in an atmospheric boundary layer. By combining that with the MU radar-RASS measurement, we successfully estimated humidity profiles at a wide height range between 0.2-7.5 km.4. Downward-looking (DL) GPS radio occultation technique is known to provide the atmospheric temperature and humidity profiles with high vertical resolution. With the objective of making this DL technique practicable, we performed the measurement experiment on the top of Mt.Fuji. We succeeded in retrieving the temperature and humidity profiles, which agree with the radiosonde observations near Mt.Fuji, from the DL measurement data. Less

湿度是阐明气象现象详细行为的最重要参数，然而，连续监测湿度剖面的遥感技术尚未完全投入实际使用。已经开发了基于大气雷达的湿度估计技术，即拉曼激光雷达和 GPS，旨在结合这些数据进行更精确的估计。研究的细节总结如下。 1. 利用大气雷达的湍流回波强度和垂直湿度梯度之间的相关性，开发了雷达遥感技术来估计湿度剖面。在该方法中，我们还将 GPS 可降水汽数据纳入稳定的反演算法中。 MU 雷达-RASS 的湿度剖面成功地阐明了雨云中的详细湿度结构，这是其他传统技术无法观测到的。2。改进了天文台以检测旋转拉曼信号，以监测温度和湿度分布。新系统还插入了窄带滤光片，使我们能够进行白天观测。 3．风廓线雷达，在 L 波段上运行，用于监测大气边界层的详细湿度剖面。通过将其与 MU 雷达-RASS 测量相结合，我们成功地估计了 0.2-7.5 km 之间的宽高度范围内的湿度剖面。看起来(DL) GPS 无线电掩星技术可以提供高垂直分辨率的大气温度和湿度剖面，为了使这种 DL 技术切实可行，我们在富士山顶进行了测量实验，我们成功地检索了该技术。温度和湿度剖面与 DL 测量数据中富士山附近的无线电探空仪观测结果一致。