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		<doi>10.1007/s00703-013-0245-9</doi>
		<issn>0177-7971</issn>
		<label>lattes: 5690147684647144 2 SilvaSouz:2013:GrMeLo</label>
		<citationkey>SilvaSouz:2013:GrMeLo</citationkey>
		<title>Ground-based measurements of local cloud cover</title>
		<year>2013</year>
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		<author>Silva, Abel Antonio da,</author>
		<author>Souza Echer, Mariza Pereira de,</author>
		<group></group>
		<group>DGE-CEA-INPE-MCTI-GOV-BR</group>
		<affiliation>Instituto de Estudos Avanc¸ados, Rod. dos Tamoios km 5.5, Torra˜o de Ouro II, Sa˜o Jose´ dos Campos, SP</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<electronicmailaddress></electronicmailaddress>
		<electronicmailaddress>mariza.echer@inpe.br</electronicmailaddress>
		<e-mailaddress>mariza.echer@inpe.br</e-mailaddress>
		<journal>Meteorology and Atmospheric Physics</journal>
		<volume>120</volume>
		<pages>201-212</pages>
		<secondarymark>A2 B1 B1</secondarymark>
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		<keywords>cloud, climate.</keywords>
		<abstract>Clouds are believed to reflect temporal climate changes through variations in their amounts, characteristics, and occurrence. In addition, they reflect both weather and climate in a region. In this work, a methodology to determine the local cloud cover (LCC) is proposed using sky images obtained from a ground-based instrument. Three years of sky images from an urban, tropical site were obtained and analyzed through that methodology. Monthly average LCC varied from 3 to 96 %, while seasonal average values were 68 % for summer, 54 % for spring, 46 % for fall, and 23 % for winter. LCC results show a clear seasonal dependence and a fair agreement (r2 = 0.72) with satellite data, which typically underestimate the cloud cover in relation to LCC. Our analysis also suggests the possibility of a measurable link between LCC and natural events like the El Nino Southern Oscillation.</abstract>
		<area>CEA</area>
		<language>en</language>
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