High-Spectral-Resolution Lidar with Iodine-Vapor Filters: Measurement of Atmospheric-State and Aerosol Profiles
| Autor: | John W. Hair, L. M. Caldwell, David A. Krueger, Chiao-Yao She |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Materials science
business.industry Materials Science (miscellaneous) Atmospheric temperature Industrial and Manufacturing Engineering Aerosol Troposphere Altitude Optics Lidar Business and International Management Tropopause Spectral resolution business Stratosphere Physics::Atmospheric and Oceanic Physics Remote sensing |
| Zdroj: | Applied Optics. 40:5280 |
| ISSN: | 1539-4522 0003-6935 |
| DOI: | 10.1364/ao.40.005280 |
| Popis: | A high-spectral-resolution lidar can measure vertical profiles of atmospheric temperature, pressure, the aerosol backscatter ratio, and the aerosol extinction coefficient simultaneously. We describe a system with these characteristics. The transmitter is a narrow-band (FWHM of the order of 74 MHz), injection-seeded, pulsed, double YAG laser at 532 nm. Iodine-vapor filters in the detection system spectrally separate the molecular and aerosol scattering and greatly reduce the latter (-41 dB). Operating at a selected frequency to take advantage of two neighboring lines in vapor filters, one can obtain a sensitivity of the measured signal-to-air temperature ratio equal to 0.42%/K. Using a relatively modest size transmitter and receiver system (laser power times telescope aperture equals 0.19 Wm(2)), our measured temperature profiles (0.5-15 km) over 11 nights are in agreement with balloon soundings to within 2.0 K over an altitude range of 2-5 km. There is good agreement in the lapse rates, tropopause altitudes, and inversions. In principle, to invert the signal requires a known density at one altitude, but in practice it is convenient to also use a known temperature at that altitude. This is a scalable system for high spatial resolution of vertical temperature profiles in the troposphere and lower stratosphere, even in the presence of aerosols. |
| Databáze: | OpenAIRE |
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