Development of a portable water vapor profiler in the lower troposphere using a small Raman lidar

使用小型拉曼激光雷达开发对流层低层便携式水汽剖面仪

• 批准号: 15340156
• 负责人: NAKAMURA Takuji
• 金额: $ 10.94万
• 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: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15340156/
• 关键词: lidar; Raman scattering; water vapor profiling; troposphere; aerosol; radio acoustic sounding system; forest atmosphere; volcanic gas; 自動観測; リモートセンシング

We have developed a transportable Raman lidar for water vapor profiling at around 200 m altitude, which is the lower boundary of a L-band wind profiler radar. A small Nd:YAG laser with a SHG of 532 nm is used for transmission and the same wavelength (532 nm), N2 Raman (607 nm) and H20 Raman (660 nm) scatters are received with a photon counting system, by means of a 35.5 cm telescope. The water vapor mixing ratio around 200 m could be observed both day and night, and the system was equipped at the Shigaraki MU observatory, Shiga, Japan for a long time. The system calibration factor did not change for more than 6 months within a deviation of 4 - 5 %. Water vapor could be profiled well for most of the times except for a rare case of the low altitude clouds or fogs. When we adjust the system to use a larger iris, water vapor mixing ratio profiles could be observed up to 3 - 4 km altitude. This lidar has been improved to be controlled remotely through a network. On the other hand, observations in a horizontal direction as well as a field observation on board a vehicle have been carried out. We found that fluctuations of waver vapor as large as 10 % over the national forest around Shigaraki observatory, as well as correlation with aerosol intensity. The measurement of water vapor content in the volcanic gas emitted from Nakadake, Mt. Aso has been successfully carried out, which is the first time of the remote-sensing measurement of H20 in the volcanic gas. As mentioned above, this study has achieved much more than we had expected at the beginning, as an application of a small Raman lidar.

我们已经开发了一个便携式拉曼激光雷达的水汽廓线在200米左右的高度，这是一个L波段风廓线雷达的下限。具有532 nm的SHG的小型Nd：YAG激光器用于传输，并且通过35.5 cm望远镜，用光子计数系统接收相同波长（532 nm）的N2拉曼（607 nm）和H2O拉曼（660 nm）散射。该系统在日本滋贺的滋乐木MU天文台长期装备，可昼夜观测到200 m附近的水汽混合比。系统校准因子在4 - 5%的偏差范围内保持不变超过6个月。除极少数低空云或雾外，大多数时间水汽廓线都能很好地显示出来。当我们调整系统使用更大的光圈时，可以在3 - 4公里的高度观察到水汽混合比廓线。该激光雷达经过改进，可以通过网络进行远程控制。另一方面，已经进行了水平方向的观测以及在车辆上的实地观测。我们发现，波动水汽的波动高达10%以上的国家森林附近的志贺木观测站，以及与气溶胶强度的相关性。对中山岳火山喷发气体中的水蒸气含量进行了测定。阿索是首次对火山气体中H20进行遥感测量的成功实施。如前所述，作为小型拉曼激光雷达的应用，本研究取得了比我们最初预期的要多得多的成果。

项目成果

Combined temperature lidar for measurements in the troposphere, stratosphere, and mesosphere.

• DOI: 10.1364/ao.43.002930
• 发表时间: 2004-05
• 期刊: Applied optics
• 影响因子: 1.9
• 作者: A. Behrendt;Takuji Nakamura;T. Tsuda

Combined Raman lidar for the measurement of atmospheric temperature, water vapor, particle extinction coefficient, and particle backscatter coefficient : System upgrades

用于测量大气温度、水蒸气、粒子消光系数和粒子反向散射系数的组合拉曼激光雷达：系统升级

• 发表时间: 2004
• 期刊: Appl. Optics, 43(14)
• 作者: Behrendt;A.;T.Nakamura;T.Tsuda
• 通讯作者: T.Tsuda

Waves in airglow structures experiment 2004 : Overview and preliminary results

2004 年气辉结构实验中的波：概述和初步结果

• 发表时间: 2005
• 期刊: Adv. Space Res 35
• 作者: Iwagamia N.;T.Nakamura et al.
• 通讯作者: T.Nakamura et al.

Simultaneous observation of dual-site airglow imagers and a sodium temperature-wind lidar, and effect of atmospheric stability on the airglow structure

• DOI: 10.1016/j.asr.2005.05.102
• 发表时间: 2005
• 期刊: Advances in Space Research
• 影响因子: 2.6
• 作者: Takuji Nakamura;T. Fukushima;T. Tsuda;C. She;B. Williams;D. Krueger;W. Lyons

Combined Raman lidar for the measurement of atmospheric temperature, water vapor, particle extinction coefficient, and particle backscatter coefficient.

• DOI: 10.1364/ao.41.007657
• 发表时间: 2002-12
• 期刊: Applied optics
• 影响因子: 1.9
• 作者: A. Behrendt;Takuji Nakamura;Michitaka Onishi;R. Baumgart;T. Tsuda