A tropical "NAT-like" belt observed from space
The optical properties of cold tropical tropopause clouds are examined on a global scale, using two years of space‐borne lidar observations from CALIPSO (June 2006–May 2008). The linear depolarization ratio, color ratio and backscatter signal are analyzed in tropical clouds colder than 200 K in a wa...
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| Veröffentlicht in: | Geophysical research letters 2009-02, Vol.36 (3), p.n/a |
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| creator | Chepfer, H. Noel, V. |
| description | The optical properties of cold tropical tropopause clouds are examined on a global scale, using two years of space‐borne lidar observations from CALIPSO (June 2006–May 2008). The linear depolarization ratio, color ratio and backscatter signal are analyzed in tropical clouds colder than 200 K in a way similar to recent studies of Polar Stratospheric Clouds (PSCs). It is found that the three categories of particles encountered in PSC (Ice, Sulfate Ternary Solutions or STS, and Nitric Acid Trihydrate or NAT) do also occur in tropical cold cloud layers. Particles with optical properties similar to NAT are few, but they cover the tropical belt and represent about 20% of cold cloud tropical particles. The optical behavior of these particles requires them to be small, non‐spherical, optically thin, and persistent in the TTL at temperatures colder than 200 K; NAT particles and very small ice crystals meet these criteria. |
| doi_str_mv | 10.1029/2008GL036289 |
| format | Article |
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The linear depolarization ratio, color ratio and backscatter signal are analyzed in tropical clouds colder than 200 K in a way similar to recent studies of Polar Stratospheric Clouds (PSCs). It is found that the three categories of particles encountered in PSC (Ice, Sulfate Ternary Solutions or STS, and Nitric Acid Trihydrate or NAT) do also occur in tropical cold cloud layers. Particles with optical properties similar to NAT are few, but they cover the tropical belt and represent about 20% of cold cloud tropical particles. 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Res. Lett</addtitle><date>2009-02</date><risdate>2009</risdate><volume>36</volume><issue>3</issue><epage>n/a</epage><issn>0094-8276</issn><eissn>1944-8007</eissn><coden>GPRLAJ</coden><abstract>The optical properties of cold tropical tropopause clouds are examined on a global scale, using two years of space‐borne lidar observations from CALIPSO (June 2006–May 2008). The linear depolarization ratio, color ratio and backscatter signal are analyzed in tropical clouds colder than 200 K in a way similar to recent studies of Polar Stratospheric Clouds (PSCs). It is found that the three categories of particles encountered in PSC (Ice, Sulfate Ternary Solutions or STS, and Nitric Acid Trihydrate or NAT) do also occur in tropical cold cloud layers. Particles with optical properties similar to NAT are few, but they cover the tropical belt and represent about 20% of cold cloud tropical particles. 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| source | Wiley Free Content; Wiley-Blackwell AGU Digital Library; Wiley Online Library Journals Frontfile Complete; EZB-FREE-00999 freely available EZB journals |
| subjects | Atmospheric and Oceanic Physics Atmospheric sciences Chemistry Clouds Crystals Earth sciences Earth, ocean, space Exact sciences and technology Ice Lidar NAT Nitric acid Optical properties Physics Radio Remote sensing Tropics Tropopause upper troposphere |
| title | A tropical "NAT-like" belt observed from space |
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