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		<isbn>978-85-17-00088-1</isbn>
		<label>59259</label>
		<citationkey>SouzaCoutNasc:2017:MéSiEs</citationkey>
		<title>Um método simples para estimar radiação solar na superfície com presença de nuvens na atmosfera</title>
		<format>Internet</format>
		<year>2017</year>
		<secondarytype>PRE CN</secondarytype>
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		<size>405 KiB</size>
		<author>Souza, Juarez Dantas,</author>
		<author>Couto, Arthur Cantalice,</author>
		<author>Nascimento, Lidiane Ramos,</author>
		<electronicmailaddress>juarezdantas@hotmail.com</electronicmailaddress>
		<editor>Gherardi, Douglas Francisco Marcolino,</editor>
		<editor>Aragão, Luiz Eduardo Oliveira e Cruz de,</editor>
		<e-mailaddress>daniela.seki@inpe.br</e-mailaddress>
		<conferencename>Simpósio Brasileiro de Sensoriamento Remoto, 18 (SBSR)</conferencename>
		<conferencelocation>Santos</conferencelocation>
		<date>28-31 maio 2017</date>
		<publisher>Instituto Nacional de Pesquisas Espaciais (INPE)</publisher>
		<publisheraddress>São José dos Campos</publisheraddress>
		<pages>2378-2384</pages>
		<booktitle>Anais</booktitle>
		<organization>Instituto Nacional de Pesquisas Espaciais (INPE)</organization>
		<transferableflag>1</transferableflag>
		<abstract>The products derived from the MODIS sensor are known for their accuracy and have been used for various purposes. The quality of these products has been proven by users but improvements are still accomplished for new collections. It happened with the cloud products collections 5 and 6. The aim of this paper is to provide a simple method to estimate instantaneous solar radiation at the surface using the cloud optical properties derived from MODIS cloud product (MOD/MYD06) Collection 6. Many papers have been published aiming the same objective. However, physical methods are more accurate and are references to produce simplified methods. In this work, the method was developed using a radiative transfer model, based on the two-stream method, with the atmosphere divided into 40 layers with thickness between 23 and 25 mb. As a result, a very simple algorithm is applied to the entire atmospheric layer. The method was applied at three different sites in rural northeastern Brazil, where the observed clouds have optical depth within the range 1.7 to 26 (-). The results attest the efficiency of the proposed method. The comparison between estimated and observed values on the surface shows a mean absolute relative error of 12%, a mean absolute error of 58 W/m2 and a RMSE of 70 W/m2, while existing methods present a RMSE between 90 and 100 W/m2.</abstract>
		<area>SRE</area>
		<type>Meteorologia e climatologia</type>
		<language>pt</language>
		<targetfile>59259.pdf</targetfile>
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