Dehydration potential of ultrathin clouds at the tropical tropopause
We report on the first simultaneous in situ and remote measurements of subvisible cirrus in the uppermost tropical troposphere. The observed cirrus, called UTTCs (ultrathin tropical tropopause clouds), are the geometrically (200–300 m) and optically (τ ≈ 10−4) thinnest large‐scale clouds ever sample...
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| Veröffentlicht in: | Geophysical research letters 2003-06, Vol.30 (11), p.n/a |
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| creator | Luo, B. P. Peter, T. Fueglistaler, S. Wernli, H. Wirth, M. Kiemle, C. Flentje, H. Yushkov, V. A. Khattatov, V. Rudakov, V. Thomas, A. Borrmann, S. Toci, G. Mazzinghi, P. Beuermann, J. Schiller, C. Cairo, F. Di Donfrancesco, G. Adriani, A. Volk, C. M. Strom, J. Noone, K. Mitev, V. MacKenzie, R. A. Carslaw, K. S. Trautmann, T. Santacesaria, V. Stefanutti, L. |
| description | We report on the first simultaneous in situ and remote measurements of subvisible cirrus in the uppermost tropical troposphere. The observed cirrus, called UTTCs (ultrathin tropical tropopause clouds), are the geometrically (200–300 m) and optically (τ ≈ 10−4) thinnest large‐scale clouds ever sampled (≈105 km2). UTTCs consist of only a few ice particles per liter with mean radius ≈5 μm, containing only 1–5 % of the total water. Yet, brief adiabatic cooling events only 1–2 K below mean ambient temperature destabilize UTTCs, leading to large sedimenting particles (r ≈ 25 μm). Due to their extreme altitude above 17 km and low particle number density, UTTCs may efficiently dehydrate air during its last encounter with the ice phase before entering the stratosphere. |
| doi_str_mv | 10.1029/2002GL016737 |
| format | Article |
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P. ; Peter, T. ; Fueglistaler, S. ; Wernli, H. ; Wirth, M. ; Kiemle, C. ; Flentje, H. ; Yushkov, V. A. ; Khattatov, V. ; Rudakov, V. ; Thomas, A. ; Borrmann, S. ; Toci, G. ; Mazzinghi, P. ; Beuermann, J. ; Schiller, C. ; Cairo, F. ; Di Donfrancesco, G. ; Adriani, A. ; Volk, C. M. ; Strom, J. ; Noone, K. ; Mitev, V. ; MacKenzie, R. A. ; Carslaw, K. S. ; Trautmann, T. ; Santacesaria, V. ; Stefanutti, L.</creator><creatorcontrib>Luo, B. P. ; Peter, T. ; Fueglistaler, S. ; Wernli, H. ; Wirth, M. ; Kiemle, C. ; Flentje, H. ; Yushkov, V. A. ; Khattatov, V. ; Rudakov, V. ; Thomas, A. ; Borrmann, S. ; Toci, G. ; Mazzinghi, P. ; Beuermann, J. ; Schiller, C. ; Cairo, F. ; Di Donfrancesco, G. ; Adriani, A. ; Volk, C. M. ; Strom, J. ; Noone, K. ; Mitev, V. ; MacKenzie, R. A. ; Carslaw, K. S. ; Trautmann, T. ; Santacesaria, V. ; Stefanutti, L.</creatorcontrib><description>We report on the first simultaneous in situ and remote measurements of subvisible cirrus in the uppermost tropical troposphere. The observed cirrus, called UTTCs (ultrathin tropical tropopause clouds), are the geometrically (200–300 m) and optically (τ ≈ 10−4) thinnest large‐scale clouds ever sampled (≈105 km2). UTTCs consist of only a few ice particles per liter with mean radius ≈5 μm, containing only 1–5 % of the total water. Yet, brief adiabatic cooling events only 1–2 K below mean ambient temperature destabilize UTTCs, leading to large sedimenting particles (r ≈ 25 μm). Due to their extreme altitude above 17 km and low particle number density, UTTCs may efficiently dehydrate air during its last encounter with the ice phase before entering the stratosphere.</description><identifier>ISSN: 0094-8276</identifier><identifier>EISSN: 1944-8007</identifier><identifier>DOI: 10.1029/2002GL016737</identifier><language>eng</language><publisher>Blackwell Publishing Ltd</publisher><ispartof>Geophysical research letters, 2003-06, Vol.30 (11), p.n/a</ispartof><rights>Copyright 2003 by the American Geophysical Union.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c4497-50041f6c957822cf9c4401fc9aeb59ee46a380d9e1f4e303a1575f3fc640692a3</citedby><cites>FETCH-LOGICAL-c4497-50041f6c957822cf9c4401fc9aeb59ee46a380d9e1f4e303a1575f3fc640692a3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1029%2F2002GL016737$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2002GL016737$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,1427,11493,27901,27902,45550,45551,46384,46443,46808,46867</link.rule.ids></links><search><creatorcontrib>Luo, B. 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M.</creatorcontrib><creatorcontrib>Strom, J.</creatorcontrib><creatorcontrib>Noone, K.</creatorcontrib><creatorcontrib>Mitev, V.</creatorcontrib><creatorcontrib>MacKenzie, R. A.</creatorcontrib><creatorcontrib>Carslaw, K. S.</creatorcontrib><creatorcontrib>Trautmann, T.</creatorcontrib><creatorcontrib>Santacesaria, V.</creatorcontrib><creatorcontrib>Stefanutti, L.</creatorcontrib><title>Dehydration potential of ultrathin clouds at the tropical tropopause</title><title>Geophysical research letters</title><addtitle>Geophys. Res. Lett</addtitle><description>We report on the first simultaneous in situ and remote measurements of subvisible cirrus in the uppermost tropical troposphere. The observed cirrus, called UTTCs (ultrathin tropical tropopause clouds), are the geometrically (200–300 m) and optically (τ ≈ 10−4) thinnest large‐scale clouds ever sampled (≈105 km2). UTTCs consist of only a few ice particles per liter with mean radius ≈5 μm, containing only 1–5 % of the total water. Yet, brief adiabatic cooling events only 1–2 K below mean ambient temperature destabilize UTTCs, leading to large sedimenting particles (r ≈ 25 μm). Due to their extreme altitude above 17 km and low particle number density, UTTCs may efficiently dehydrate air during its last encounter with the ice phase before entering the stratosphere.</description><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2003</creationdate><recordtype>article</recordtype><recordid>eNp9kE9LxDAUxIMouK7e_AA9ebL6kqZJc5RdrbpVwb_HELMJW-02tUnR_fa2VMSTpzcMvxkeg9AhhhMMRJwSAJIXgBlP-BaaYEFpnAHwbTQBEL0mnO2iPe_fACCBBE_QfG5Wm2WrQunqqHHB1KFUVeRs1FWht1dlHenKdUsfqRCFlYlC65pS98wgXKM6b_bRjlWVNwc_d4qeLs4fZ5dxcZdfzc6KWFMqeJwCUGyZFinPCNFW9DZgq4Uyr6kwhjKVZLAUBltq-vcUTnlqE6sZBSaISqboaOxtWvfRGR_kuvTaVJWqjeu8xBnPMEtJDx6PoG6d962xsmnLtWo3EoMcppJ_p-pxMuKfZWU2_7Iyvy8wY9kQisdQ6YP5-g2p9l0OYCpfbnNJr28WD5g-y0XyDTI7eRs</recordid><startdate>200306</startdate><enddate>200306</enddate><creator>Luo, B. 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M.</au><au>Strom, J.</au><au>Noone, K.</au><au>Mitev, V.</au><au>MacKenzie, R. A.</au><au>Carslaw, K. S.</au><au>Trautmann, T.</au><au>Santacesaria, V.</au><au>Stefanutti, L.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Dehydration potential of ultrathin clouds at the tropical tropopause</atitle><jtitle>Geophysical research letters</jtitle><addtitle>Geophys. Res. Lett</addtitle><date>2003-06</date><risdate>2003</risdate><volume>30</volume><issue>11</issue><epage>n/a</epage><issn>0094-8276</issn><eissn>1944-8007</eissn><abstract>We report on the first simultaneous in situ and remote measurements of subvisible cirrus in the uppermost tropical troposphere. The observed cirrus, called UTTCs (ultrathin tropical tropopause clouds), are the geometrically (200–300 m) and optically (τ ≈ 10−4) thinnest large‐scale clouds ever sampled (≈105 km2). UTTCs consist of only a few ice particles per liter with mean radius ≈5 μm, containing only 1–5 % of the total water. Yet, brief adiabatic cooling events only 1–2 K below mean ambient temperature destabilize UTTCs, leading to large sedimenting particles (r ≈ 25 μm). Due to their extreme altitude above 17 km and low particle number density, UTTCs may efficiently dehydrate air during its last encounter with the ice phase before entering the stratosphere.</abstract><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2002GL016737</doi><tpages>4</tpages><oa>free_for_read</oa></addata></record> |
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| title | Dehydration potential of ultrathin clouds at the tropical tropopause |
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