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Tipo da ReferênciaJournal Article
Identificador8JMKD3MGP3W34P/3HPBBCC
Repositóriosid.inpe.br/mtc-m21b/2015/01.14.11.05.43   (acesso restrito)
Metadadossid.inpe.br/mtc-m21b/2015/01.14.11.05.44
Sitemtc-m21b.sid.inpe.br
DOI10.1016/j.asr.2014.06.006
Rótuloisi 2015-01 FernandezHoeLemSou:2014:LaMeAp
ISSN0273-1177
1879-1948
Código do Detentorisadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S
Chave de CitaçãoCerqueiraJúniorFerHoeLemSou:2014:LaMeAp
Autor1 Cerqueira Júnior, João Gualberto de
2 Fernandez, J. H.
3 Hoelzemann, J. J.
4 Leme, Neusa Maria Paes
5 Sousa, C. T.
Identificador de Curriculo1 8JMKD3MGP5W/3C9JHEP
2
3
4 8JMKD3MGP5W/3C9JHUP
Grupo1 CRN-CCR-INPE-MCTI-GOV-BR
2
3
4 CRC-CRC-INPE-MCTI-GOV-BR
5 CRN-CCR-INPE-MCTI-GOV-BR
Afiliação1 Instituto Nacional de Pesquisas Espaciais (INPE)
2 Univ Fed Rio Grande Norte UFRN, BR-59078970 Natal, RN, Brazil.
3 Univ Fed Rio Grande Norte UFRN, BR-59078970 Natal, RN, Brazil.
4 Instituto Nacional de Pesquisas Espaciais (INPE)
5 Instituto Nacional de Pesquisas Espaciais (INPE)
TítuloLangley method applied in study of aerosol optical depth in the Brazilian semiarid region using 500, 670 and 870 nm bands for sun photometer calibration
RevistaAdvances in Space Research
Ano2014
Volume54
Número8
MêsOct.
Palavras-Chaveoptical depth, Brazilian semiarid, sun photometer calibration, Langley method.
ResumoDue to the high costs of commercial monitoring instruments, a portable sun photometer was developed at INPE/CRN laboratories, operating in four bands, with two bands in the visible spectrum and two in near infrared. The instrument calibration process is performed by applying the classical Langley method. Application of the Langley's methodology requires a site with high optical stability during the measurements, which is usually found in high altitudes. However, far from being an ideal site, Harrison et al. (1994) report success with applying the Langley method to some data for a site in Boulder, Colorado. Recently, Liu et al. (2011) show that low elevation sites, far away from urban and industrial centers can provide a stable optical depth, similar to high altitudes. In this study we investigated the feasibility of applying the methodology in the semiarid region of northeastern Brazil, far away from pollution areas with low altitudes, for sun photometer calibration. We investigated optical depth stability using two periods of measurements in the year during dry season in austral summer. The first one was in December when the native vegetation naturally dries, losing all its leaves and the second one was in September in the middle of the dry season when the vegetation is still with leaves. The data were distributed during four days in December 2012 and four days in September 2013 totaling eleven half days of collections between mornings and afternoons and by means of fitted line to the data V-0 values were found. Despite the high correlation between the collected data and the fitted line, the study showed a variation between the values of V-0 greater than allowed for sun photometer calibration. The lowest V-0 variation reached in this experiment with values lower than 3% for the bands 500, 670 and 870 nm are displayed in tables. The results indicate that the site needs to be better characterized with studies in more favorable periods, soon after the rainy season.
Páginas1530-1543
Idiomaen
Tipo de Trabalhojournal article
Tipo SecundárioPRE PI
DivulgaçãoWEBSCI; PORTALCAPES; COMPENDEX; SCOPUS.
AreaETES
Projetoproject: “Determinação do Perfil Vertical de Variáveis Atmosféricas no Rio Grande do Norte para Validaçãoo de Dados obtidos por Satélites”: DEPVARN – SAT, edital AEB/MCT/CNPq No 033/2010 Processo n° 560314/2010-8.
Nota SecundáriaB1_ENGENHARIAS_IV B1_ENGENHARIAS_III B1_GEOCIÊNCIAS B1_BIODIVERSIDADE B1_INTERDISCIPLINAR B3_CIÊNCIA_DA_COMPUTAÇÃO B4_ASTRONOMIA_/_FÍSICA C_CIÊNCIAS_BIOLÓGICAS_I
Nota TerciáriaTrabalho não Vinculado à Tese/Dissertação
Tamanho852 KiB
Número de Arquivos1
Arquivo Alvo1-s2.0-S0273117714003482-main.pdf
Última Atualização2015:01.15.15.11.37 sid.inpe.br/mtc-m21b/2013/09.26.14.25.20 administrator
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Permissão de Leituradeny from all and allow from 150.163
Unidades Imediatamente Superiores8JMKD3MGPCW/3EUAPES
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Histórico2018-06-04 03:04:44 :: administrator -> marcelo.pazos@inpe.br :: 2014
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