Development of Field-deployable Diode-laser-based Water Vapor Dial

Hoai, Phong Pham Le; Abo, Makoto; Sakai, Tetsu

doi:10.1051/epjconf/201611905011

Cited by 7 publications

(3 citation statements)

References 2 publications

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“…We developed our MRL system to meet these requirements as much as possible within the total material cost of ∼ USD 250 000. The Raman lidar technique is a well-established technique for measuring the water vapor distribution in the troposphere (e.g., Melfi et al, 1969;Whiteman et al, 1992), and the systems have been in operation for decades at stations around the world (Turner et al, 2016;Dinoev et al, 2013;Reichardt et al, 2012;Leblanc et al, 2012). Field-deployable systems have also been developed by several institutes (Whiteman et al, 2012;Chazette et al, 2014;Engelmann et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Automated compact mobile Raman lidar for water vapor measurement: instrument description and validation by comparison with radiosonde, GNSS, and high-resolution objective analysis

et al. 2019

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We developed an automated compact mobile Raman lidar (MRL) system for measuring the vertical distribution of the water vapor mixing ratio (w) in the lower troposphere, which has an affordable cost and is easy to operate. The MRL was installed in a small trailer for easy deployment and can start measurement in a few hours, and it is capable of unattended operation for several months. We describe the MRL system and present validation results obtained by comparing the MRL-measured data with collocated radiosonde, Global Navigation Satellite System (GNSS), and high-resolution objective analysis data. The comparison results showed that MRL-derived w agreed within 10 % (rootmean-square difference of 1.05 g kg −1 ) with values obtained by radiosonde at altitude ranges between 0.14 and 1.5 km in the daytime and between 0.14 and 5-6 km at night in the absence of low clouds; the vertical resolution of the MRL measurements was 75-150 m, their temporal resolution was less than 20 min, and the measurement uncertainty was less than 30 %. MRL-derived precipitable water vapor values were similar to or slightly lower than those obtained by GNSS at night, when the maximum height of MRL measurements exceeded 5 km. The MRL-derived w values were at most 1 g kg −1 (25 %) larger than local analysis data. A total of 4 months of continuous operation of the MRL system demonstrated its utility for monitoring water vapor distributions in the lower troposphere.Published by Copernicus Publications on behalf of the European Geosciences Union.

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Section: Introductionmentioning

confidence: 99%

Automated compact mobile Raman lidar for water vapor measurement: instrument description and validation by comparison with radiosonde, GNSS, and high-resolution objective analysis

et al. 2019

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“…To detect water vapor in the middle troposphere in the daytime, a diode laser-based differential absorption lidar might be useful because it can continuously measure the water vapor concentration up to an altitude of 3 km both in the daytime and at night (Repasky et al, 2013;Spuler et al, 2015). We are also developing such a system (Pham Le Hoai et al, 2016) to improve the model forecast skill for heavy rainfall in urban areas.…”

Section: Resultsmentioning

confidence: 99%

Mobile water vapor Raman lidar for heavy rain forecasting: system description and validation

Sakai

Nagai

Izumi

et al. 2018

Preprint

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Abstract. To improve the lead time and accuracy of predictions of localized heavy rainfall, which can cause extensive damage in urban areas in Japan, we developed a mobile Raman lidar (RL) system for measuring the vertical distribution of the water vapor mixing ratio (w) in the lower troposphere. The RL was installed in a small trailer for easy deployment to the upwind side of potential rainfall areas to monitor the inflow of moist air before rainfall events. We describe the lidar system and present validation results obtained by comparing the RL-measured data with collocated radiosonde, Global Navigation Satellite System (GNSS), and high-resolution objective analysis data. The comparison results showed that RL-derived w agreed within 10 % with values obtained by radiosonde at altitude ranges between 0.14 and 1.5 km in the daytime and between 0.14 and 5–6 km at night in the absence of low clouds; the vertical resolution of the RL measurements was 75–150 m, their temporal resolution was less than 20 min, and the measurement uncertainty was less than 30 %. RL-derived precipitable water vapor values were similar to or slightly lower than those obtained by GNSS at night, when the maximum height of RL measurements exceeded 5 km. The RL-derived w values were at most 1 g/kg (25 %) larger than local analysis data. Four months of continuous operation of the RL system demonstrated its utility for monitoring water vapor distributions for heavy rain forecasting.

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“…This technique relies on narrowband, high-spectral-fidelity diode lasers, which enable accurate and calibrated measurements, requiring a minimal set of assumptions and a ratio of two signals [18,19]. Narrow-band DIALs with a water vapor profiling capability have been successfully developed in different research institutions [20,21]. The narrow-band DIAL approach relies on laser sources whose spectral width is much narrower than the targeted absorption feature [22].…”

Section: Introductionmentioning

confidence: 99%

Atmospheric Thermodynamic Profiling through the Use of a Micro-Pulse Raman Lidar System: Introducing the Compact Raman Lidar MARCO

Di Girolamo,

Franco,

Di Paolantonio

et al. 2023

Sensors

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It was for a long time believed that lidar systems based on the use of high-repetition micro-pulse lasers could be effectively used to only stimulate atmospheric elastic backscatter echoes, and thus were only exploited in elastic backscatter lidar systems. Their application to stimulate rotational and roto-vibrational Raman echoes, and consequently, their exploitation in atmospheric thermodynamic profiling, was considered not feasible based on the technical specifications possessed by these laser sources until a few years ago. However, recent technological advances in the design and development of micro-pulse lasers, presently achieving high UV average powers (1–5 W) and small divergences (0.3–0.5 mrad), in combination with the use of large aperture telescopes (0.3–0.4 m diameter primary mirrors), allow one to presently develop micro-pulse laser-based Raman lidars capable of measuring the vertical profiles of atmospheric thermodynamic parameters, namely water vapor and temperature, both in the daytime and night-time. This paper is aimed at demonstrating the feasibility of these measurements and at illustrating and discussing the high achievable performance level, with a specific focus on water vapor profile measurements. The technical solutions identified in the design of the lidar system and their technological implementation within the experimental setup of the lidar prototype are also carefully illustrated and discussed.

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Development of Field-deployable Diode-laser-based Water Vapor Dial

Cited by 7 publications

References 2 publications

Automated compact mobile Raman lidar for water vapor measurement: instrument description and validation by comparison with radiosonde, GNSS, and high-resolution objective analysis

Automated compact mobile Raman lidar for water vapor measurement: instrument description and validation by comparison with radiosonde, GNSS, and high-resolution objective analysis

Mobile water vapor Raman lidar for heavy rain forecasting: system description and validation

Atmospheric Thermodynamic Profiling through the Use of a Micro-Pulse Raman Lidar System: Introducing the Compact Raman Lidar MARCO

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