Temperature sensitivity of differential absorption lidar measurements of water vapor in the 720-nm region

Browell, E. V.; Ismail, Syed; Grossmann, Benoist E.

doi:10.1364/ao.30.001517

Cited by 31 publications

(26 citation statements)

References 11 publications

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“…A fiber-coupled photoncounting avalanche photodiode (APD) module is used to detect the collected optical signal. The laser transmitter comes into overlap with the DIAL receiver at 500 m. The evaluation of the temperature sensitivities of water vapor absorption lines in the 820-840-nm spectral region were studied using the methods presented by Browell et al (1991), leading to the selection of this water vapor absorption line for number density profiles at 828.187 nm (vacuum) (the online wavelength). A summary of the water vapor DIAL transmitter and the receiver specifications are shown in Table 2, where the laser transmitter requirements for accurate water vapor profiling are also shown for comparison.…”

Section: Water Vapor Differential Absorption Lidar (Dial)mentioning

confidence: 99%

Observational Studies of Atmospheric Aerosols over Bozeman, Montana, Using a Two-Color Lidar, a Water Vapor DIAL, a Solar Radiometer, and a Ground-Based Nephelometer over a 24-h Period

Repasky

Reagan

Nehrir

et al. 2011

Journal of Atmospheric and Oceanic Technology

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Coordinated observational data of atmospheric aerosols were collected over a 24-h period between 2300 mountain daylight time (MDT) on at Bozeman, Montana (45.668N, 111.048W, elevation 1530 m) using a collocated two-color lidar, a diode-laser-based water vapor differential absorption lidar (DIAL), a solar radiometer, and a ground-based nephelometer. The optical properties and spatial distribution of the atmospheric aerosols were inferred from the observational data collected using the collocated instruments as part of a closure experiment under dry conditions with a relative humidity below 60%. The aerosol lidar ratio and aerosol optical depth retrieved at 532 and 1064 nm using the two-color lidar and solar radiometer agreed with one another to within their individual uncertainties while the scattering component of the aerosol extinction measured using the nephelometer matched the scattering component of the aerosol extinction retrieved using the 532-nm channel of the two-color lidar and the singlescatter albedo retrieved using the solar radiometer. Using existing aerosol models developed with Aerosol Robotic Network (AERONET) data, a thin aerosol layer observed over Bozeman was most likely identified as smoke from forest fires burning in California; Washington; British Columbia, Canada; and northwestern Montana. The intrusion of the thin aerosol layer caused a change in the atmospheric radiative forcing by a factor of 1.8 6 0.5 due to the aerosol direct effect.

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Section: Water Vapor Differential Absorption Lidar (Dial)mentioning

confidence: 99%

Observational Studies of Atmospheric Aerosols over Bozeman, Montana, Using a Two-Color Lidar, a Water Vapor DIAL, a Solar Radiometer, and a Ground-Based Nephelometer over a 24-h Period

Repasky

Reagan

Nehrir

et al. 2011

Journal of Atmospheric and Oceanic Technology

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“…We first performed our temperature sensitivity analysis in the same region as Ref. 41, near 720 nm, to confirm that we could reproduce their results. We then applied a similar analysis to absorption lines in the 824 -841 nm region.…”

Section: Water Vapor Absorption Line Selectionmentioning

confidence: 55%

Development of a widely tunable amplified diode laser differential absorption lidar for profiling atmospheric water vapor

Repasky

2010

J. Appl. Remote Sens

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This work describes the design and testing of a highly-tunable differential absorption lidar (DIAL) instrument utilizing an all-semiconductor transmitter. This new DIAL instrument transmitter has a highly-tunable external cavity diode laser (ECDL) as a seed laser source for two cascaded commercial tapered amplifiers. The transmitter has the capability of tuning over a range of ~ 17 nm centered at about 832 nm to selectively probe several water vapor absorption lines. This capability has been requested in other recent DIAL experiments for wavelengths near 830 nm. The transmitter produces pulse energies of approximately 0.25 μJ at a repetition rate of 20 kHz. The linewidth is exceptionally narrow at <0.3 MHz, with frequency stability that has been shown to be +/-88 MHz and spectral purity of 0.995. Tests of the DIAL instrument to prove the validity of its measurements were undertaken. Preliminary water vapor profiles, taken in Bozeman, Montana, agree to within 5-60% with profiles derived from co-located radiosondes 800 meters above ground altitude. Below 800 meters, the measurements are biased low due to a number of systematic issues that are discussed. The long averaging times required by low-power systems have been shown to lead to biases in data, and indeed, our results showed strong disagreements on nights when the atmosphere was changing rapidly, such as on windy nights or when a storm system was entering the area. Improvements to the system to correct the major systematic biases are described.

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“…Low energy of the ground state implies a low temperature sensitivity of the absorption cross section (<0.4%/K). 13,35 The line strength range includes weak lines for probing the boundary layer as well as strong lines for the middle (Fig 3, right panel). Figure 3 shows the single shot retrieval precision for each selected line and the optimal altitude range of the retrievals.…”

Section: Spectral Lines Selectionmentioning

confidence: 99%

Profiling tropospheric water vapour with a coherent infrared differential absorption lidar: a sensitivity analysis

et al. 2012

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In the last decade the precision of coherent Doppler differential absorption lidar (DIAL) has been greatly improved in near and middle infra-red domains for measuring greenhouse gases such as CO 2 , CH 4 and winds. The National Institute of Information and Communications Technology (NICT, Japan) has developed and is operating a CO 2 and wind measuring ground-based coherent DIAL at 2.05 µm (4878 cm −1 ). The application of this technology from space is now considered. In this analysis we study the use of the NICT DIAL for profiling tropospheric water vapour from space. We present the methodology to select the spectral lines and summarized the results of the selected lines between 4000 and 7000 cm −1 . The choice of the frequency offset, the pulse energy and repetition frequency are discussed. Retrieval simulations from the line at 4580 cm −1 (2.18 µm) suitable for the boundary layer and the stronger one at 5621 cm −1 (1.78 µm) for sounding the boundary layer and the middle troposphere, are shown.

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Temperature sensitivity of differential absorption lidar measurements of water vapor in the 720-nm region

Cited by 31 publications

References 11 publications

Observational Studies of Atmospheric Aerosols over Bozeman, Montana, Using a Two-Color Lidar, a Water Vapor DIAL, a Solar Radiometer, and a Ground-Based Nephelometer over a 24-h Period

Observational Studies of Atmospheric Aerosols over Bozeman, Montana, Using a Two-Color Lidar, a Water Vapor DIAL, a Solar Radiometer, and a Ground-Based Nephelometer over a 24-h Period

Development of a widely tunable amplified diode laser differential absorption lidar for profiling atmospheric water vapor

Profiling tropospheric water vapour with a coherent infrared differential absorption lidar: a sensitivity analysis

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