Large-Scale Diurnal Variations of Tropical Cold Cloudiness Based on a Simple Cloud Indexing Method
Diurnal variations of cold cloudiness during a 2-year period (October 1985–September 1987) over the tropical area covered by Meteosat (from 23°N to 23°S and from 60°E to 60°W) are studied using a simple precipitation index based on infrared data with a unique blackbody temperature threshold of 235 K...
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| Veröffentlicht in: | Journal of climate 1992-02, Vol.5 (2), p.173-180 |
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| container_title | Journal of climate |
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| creator | Thiao, Wassila Turpeinen, Olli M. |
| description | Diurnal variations of cold cloudiness during a 2-year period (October 1985–September 1987) over the tropical area covered by Meteosat (from 23°N to 23°S and from 60°E to 60°W) are studied using a simple precipitation index based on infrared data with a unique blackbody temperature threshold of 235 K. The index is calculated every three hours and accumulated over 5-day periods. The results indicate that the cold cloudiness undergoes a pronounced diurnal cycle only over the continent during the rainy season, with an afternoon maximum between 1500 and 2100 LST and a morning minimum between 0600 and 1200 LST. Over flat areas, diurnal variations are weaker than in the mountains. Over water surfaces, the diurnal variations of cold cloudiness are irregular, but along the coasts, morning maxima (0600–1200 LST) are the most frequent. The present study shows the potential utility of the easily manageable precipitation-index dataset in cloud climatology studies, as the results reported here are in agreement with earlier studies based on more complex datasets. |
| doi_str_mv | 10.1175/1520-0442(1992)005<0173:LSDVOT>2.0.CO;2 |
| format | Article |
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The index is calculated every three hours and accumulated over 5-day periods. The results indicate that the cold cloudiness undergoes a pronounced diurnal cycle only over the continent during the rainy season, with an afternoon maximum between 1500 and 2100 LST and a morning minimum between 0600 and 1200 LST. Over flat areas, diurnal variations are weaker than in the mountains. Over water surfaces, the diurnal variations of cold cloudiness are irregular, but along the coasts, morning maxima (0600–1200 LST) are the most frequent. The present study shows the potential utility of the easily manageable precipitation-index dataset in cloud climatology studies, as the results reported here are in agreement with earlier studies based on more complex datasets.</description><identifier>ISSN: 0894-8755</identifier><identifier>EISSN: 1520-0442</identifier><identifier>DOI: 10.1175/1520-0442(1992)005<0173:LSDVOT>2.0.CO;2</identifier><language>eng</language><publisher>Boston, MA: American Meteorological Society</publisher><subject>Climate cycles ; Climate models ; Climatology ; Climatology. Bioclimatology. 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The index is calculated every three hours and accumulated over 5-day periods. The results indicate that the cold cloudiness undergoes a pronounced diurnal cycle only over the continent during the rainy season, with an afternoon maximum between 1500 and 2100 LST and a morning minimum between 0600 and 1200 LST. Over flat areas, diurnal variations are weaker than in the mountains. Over water surfaces, the diurnal variations of cold cloudiness are irregular, but along the coasts, morning maxima (0600–1200 LST) are the most frequent. The present study shows the potential utility of the easily manageable precipitation-index dataset in cloud climatology studies, as the results reported here are in agreement with earlier studies based on more complex datasets.</description><subject>Climate cycles</subject><subject>Climate models</subject><subject>Climatology</subject><subject>Climatology. Bioclimatology. Climate change</subject><subject>Clouds</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>External geophysics</subject><subject>Hubble Space Telescope</subject><subject>Meteorology</subject><subject>NOTES AND CORRESPONDENCE</subject><subject>Oceans</subject><subject>Precipitation</subject><subject>Rain</subject><subject>Rainy seasons</subject><subject>Tropical climates</subject><issn>0894-8755</issn><issn>1520-0442</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1992</creationdate><recordtype>article</recordtype><recordid>eNo9kMGO0zAQhi0EEmXhEZB8QAgO6Y4ntePACgmysKxU1EPLXq1JYi9epXGxUwneHoeuehpp_m_-kT7GLgUshajkpZAIBaxW-E7UNb4HkFcgqvLDent9t9l9wiUsm81HfMIWZ_IpW4CuV4WupHzOXqT0ACBQASxYu6Z4b4ttR4Pl1_4YRxr4HUVPkw9j4sHxXQwHn3PehKHnzRCOvR9tSvwLJdvzMHLiW78_5IL_Ib8de_vHj_f8h51-hf4le-ZoSPbV47xgP7993TXfi_Xm5rb5vC46rNVUKNTKgiVhnWy1pFKoWleEQq5QtqJs0SnoZY2gsVQoq4paSdI567SqHJUX7O2p9xDD76NNk9n71NlhoNGGYzIi35WodQZvTmAXQ0rROnOIfk_xrxFgZsdmNmdmc2Z2bLJjMzs2J8cmb0yzMZib3jy-pJQNuUhj59O5TkqhAeqMvT5hD2kK8RyjEnUFSpb_AP4tiFM</recordid><startdate>19920201</startdate><enddate>19920201</enddate><creator>Thiao, Wassila</creator><creator>Turpeinen, Olli M.</creator><general>American Meteorological Society</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>KL.</scope></search><sort><creationdate>19920201</creationdate><title>Large-Scale Diurnal Variations of Tropical Cold Cloudiness Based on a Simple Cloud Indexing Method</title><author>Thiao, Wassila ; Turpeinen, Olli M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c296t-6286e0ea1ef5b85a316987a215425b13b2f60d592082362577ab5a5ffef867fa3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1992</creationdate><topic>Climate cycles</topic><topic>Climate models</topic><topic>Climatology</topic><topic>Climatology. Bioclimatology. Climate change</topic><topic>Clouds</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>External geophysics</topic><topic>Hubble Space Telescope</topic><topic>Meteorology</topic><topic>NOTES AND CORRESPONDENCE</topic><topic>Oceans</topic><topic>Precipitation</topic><topic>Rain</topic><topic>Rainy seasons</topic><topic>Tropical climates</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Thiao, Wassila</creatorcontrib><creatorcontrib>Turpeinen, Olli M.</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><jtitle>Journal of climate</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Thiao, Wassila</au><au>Turpeinen, Olli M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Large-Scale Diurnal Variations of Tropical Cold Cloudiness Based on a Simple Cloud Indexing Method</atitle><jtitle>Journal of climate</jtitle><date>1992-02-01</date><risdate>1992</risdate><volume>5</volume><issue>2</issue><spage>173</spage><epage>180</epage><pages>173-180</pages><issn>0894-8755</issn><eissn>1520-0442</eissn><abstract>Diurnal variations of cold cloudiness during a 2-year period (October 1985–September 1987) over the tropical area covered by Meteosat (from 23°N to 23°S and from 60°E to 60°W) are studied using a simple precipitation index based on infrared data with a unique blackbody temperature threshold of 235 K. The index is calculated every three hours and accumulated over 5-day periods. The results indicate that the cold cloudiness undergoes a pronounced diurnal cycle only over the continent during the rainy season, with an afternoon maximum between 1500 and 2100 LST and a morning minimum between 0600 and 1200 LST. Over flat areas, diurnal variations are weaker than in the mountains. Over water surfaces, the diurnal variations of cold cloudiness are irregular, but along the coasts, morning maxima (0600–1200 LST) are the most frequent. The present study shows the potential utility of the easily manageable precipitation-index dataset in cloud climatology studies, as the results reported here are in agreement with earlier studies based on more complex datasets.</abstract><cop>Boston, MA</cop><pub>American Meteorological Society</pub><doi>10.1175/1520-0442(1992)005<0173:LSDVOT>2.0.CO;2</doi><tpages>8</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Journal of climate, 1992-02, Vol.5 (2), p.173-180 |
| issn | 0894-8755 1520-0442 |
| language | eng |
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| source | American Meteorological Society; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; JSTOR Archive Collection A-Z Listing |
| subjects | Climate cycles Climate models Climatology Climatology. Bioclimatology. Climate change Clouds Earth, ocean, space Exact sciences and technology External geophysics Hubble Space Telescope Meteorology NOTES AND CORRESPONDENCE Oceans Precipitation Rain Rainy seasons Tropical climates |
| title | Large-Scale Diurnal Variations of Tropical Cold Cloudiness Based on a Simple Cloud Indexing Method |
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