Remote Sounding of High Clouds. Part VI: Optical Properties of Midlatitude and Tropical Cirrus
| Autor: | C. M. R. Platt, A. C. Dilley, S. C. Scott |
|---|---|
| Rok vydání: | 1987 |
| Předmět: |
Atmospheric Science
Radiometer Backscatter Astrophysics::Cosmology and Extragalactic Astrophysics Depth sounding Lidar Extinction (optical mineralogy) Depolarization ratio Environmental science Cirrus Astrophysics::Galaxy Astrophysics Physics::Atmospheric and Oceanic Physics Optical depth Remote sensing |
| Zdroj: | Journal of the Atmospheric Sciences. 44:729-747 |
| ISSN: | 1520-0469 0022-4928 |
| DOI: | 10.1175/1520-0469(1987)044<0729:rsohcp>2.0.co;2 |
| Popis: | A lidar (0.694 μm wavelength) and a passive radiometer (10–12 μm) have been used together to remotely sense the optical properties and gross structure of cirrus (the LIRAD method). This article reports on observations of midlatitude cirrus taken during two extended experiments at Aspendale, Victoria, Australia, covering one winter season and one summer season and a six-week period of observations of tropical cirrus at Darwin, Northern Territory. Information has been obtained on the infrared emittance, optical depth, cloud depth, depolarization ratio, “anomalous” backscatter, the effective ratios of backscatter to extinction at the lidar wavelength and the visible to infrared extinction, and the backscatter profile of cirrus. The results show that the infrared emittance and volume absorption coefficient of midlatitude cirrus, when averaged over a year, are close functions of the midcloud temperature. Very similar relationships hold for tropical cirrus, taking into amount the limited samples. Mean ... |
| Databáze: | OpenAIRE |
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