Abstract
The High Spectral Resolution Lidar (HSRL) designed at the University of Wisconsin-Madison discriminates between Mie and Rayleigh backscattering [1]. It exploits the Doppler effect caused by thermal motion of molecules, which broadens the spectrum of the transmitted laser light. That allows for absolute calibration of the lidar and measurements of the aerosol volume backscatter coefficient. Two iodine absorption filters with different absorption line widths (a regular iodine vapor filter and Argon buffered iodine filter) allow for atmospheric temperature profile measurements. The sensitivity of the measured signal-to-air temperature ratio is around 0.14%/K. The instrument uses a shared telescope transmitter-receiver design and operates in eyesafe mode (the product of laser average power and telescope aperture equals 0.1 W m 2 at 532 nm).
Highlights
The atmospheric temperature is an important parameter that describes the atmospheric state
Some types of lidars are capable of measuring the atmospheric temperature profile with a relatively large spatial resolution and with more frequent measurement
Several investigators have made atmospheric temperature profile measurements using a High Spectral Resolution Lidar (HSRL) [2,3,4,5]. These techniques suffer from low signal-to-noise ratio, low sensitivity to air temperature, and/or operate highly exceeding the eye-safe limit on the transmitted laser power; and suffer from limitations in filter and laser frequency stability
Summary
The atmospheric temperature is an important parameter that describes the atmospheric state. Several investigators have made atmospheric temperature profile measurements using a High Spectral Resolution Lidar (HSRL) [2,3,4,5]. These techniques suffer from low signal-to-noise ratio, low sensitivity to air temperature, and/or operate highly exceeding the eye-safe limit on the transmitted laser power; and suffer from limitations in filter and laser frequency stability. The standard HSRL technique requires the atmospheric temperature and pressure profile for instrument calibration. We report the atmospheric temperature profile measurements performed by the University of Wisconsin – Madison High Spectral Resolution Lidar. Work done in attempt to perfect this technique have improved instrument performance and data quality for standard HSRL measurements
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