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1. Identity statement
Reference TypeJournal Article
Sitemtc-m21b.sid.inpe.br
Holder Codeisadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S
Identifier8JMKD3MGP3W34P/3QAT8D5
Repositorysid.inpe.br/mtc-m21b/2018/01.04.15.32   (restricted access)
Last Update2018:01.04.15.32.46 (UTC) administrator
Metadata Repositorysid.inpe.br/mtc-m21b/2018/01.04.15.32.46
Metadata Last Update2021:03.06.05.21.50 (UTC) administrator
DOI10.1016/j.esd.2017.12.001
ISSN0973-0826
Citation KeyLuizMartCostPere:2018:CaSt
TitleComparison of methodologies for cloud cover estimation in Brazil: a case study
Year2018
Monthmar.
Access Date2024, June 13
Type of Workjournal article
Secondary TypePRE PI
Number of Files1
Size457 KiB
2. Context
Author1 Luiz, Eduardo Weide
2 Martins, Fernando Ramos
3 Costa, Rodrigo Santos
4 Pereira, Enio Bueno
Resume Identifier1
2
3
4 8JMKD3MGP5W/3C9JH2E
Group1 CST-CST-SESPG-INPE-MCTIC-GOV-BR
2
3 COCST-COCST-INPE-MCTIC-GOV-BR
4 COCST-COCST-INPE-MCTIC-GOV-BR
Affiliation1 Instituto Nacional de Pesquisas Espaciais (INPE)
2 Universidade Federal de São Paulo (UNIFESP)
3 Instituto Nacional de Pesquisas Espaciais (INPE)
4 Instituto Nacional de Pesquisas Espaciais (INPE)
Author e-Mail Address1 eduardo.luiz@inpe.br
2
3 rodrigo.costa@inpe.br
4 enio.pereira@inpe.br
JournalEnergy for Sustainable Development
Volume43
Pages15-22
History (UTC)2018-01-04 15:33:53 :: simone -> administrator :: 2018
2021-03-06 05:21:50 :: administrator -> simone :: 2018
3. Content and structure
Is the master or a copy?is the master
Content Stagecompleted
Transferable1
Content TypeExternal Contribution
Version Typepublisher
KeywordsCloud cover estimation
All-sky camera
Satellite
Long-wave radiation
AbstractClouds are the major modulator of the shortwave and longwave radiation components of the Earth's energy balance and, as such, help to regulate the planet's temperature. In the energy sector, clouds are a source of instability in the generation of energy using solar technologies. This study aims at comparing three approaches to get cloud cover information in the Southeastern region of Brazil during the period of approximately three months. The first method, assumed as reference, uses all-sky camera pictures for the cloud cover estimation. The other two methodologies use downward longwave radiation with surface meteorological data and geostationary satellite data. Both methods presented good agreement with the camera for clear sky and overcast conditions, with probabilities of detection of 92.8% and 80.7% for the longwave method and 93.3% and 87.6% for the satellite method, respectively. The major problem occurs with the broken-clouds sky scenario, with probabilities of detection above 38%, where each method has its own specificity, such as, longwave emissivity of the atmosphere, spatial resolution and view geometry. The long-wave method has the minor R correlation with the camera (87%) when compared with the satellite method (93%) and requires a daily normalization, which make it not usable for instantaneous measurements. Regarding the satellite method, the most important issue is the spatial resolution, which has the major impact on the broken-clouds sky scenarios. The cloud masking works properly for large clouds with, at least, the size comparable to the satellite image pixel. Furthermore, the method using the all-sky camera also needs to be improved, because it presented some deficiencies, like very bright areas around the sun, sometimes identified as clouds, leading to cloud cover overestimation.
AreaCST
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4. Conditions of access and use
Languageen
User Groupself-uploading-INPE-MCTI-GOV-BR
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Reader Groupadministrator
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Visibilityshown
Read Permissiondeny from all and allow from 150.163
Update Permissionnot transferred
5. Allied materials
LinkingTrabalho não Vinculado à Tese/Dissertação
Mirror Repositoryurlib.net/www/2011/03.29.20.55
Next Higher Units8JMKD3MGPCW/3F3T29H
8JMKD3MGPCW/449U4PL
Citing Item Listsid.inpe.br/bibdigital/2013/10.19.20.40 5
sid.inpe.br/bibdigital/2021/03.06.05.18 4
sid.inpe.br/mtc-m21/2012/07.13.14.45.21 2
DisseminationWEBSCI; PORTALCAPES; SCOPUS.
Host Collectionsid.inpe.br/mtc-m21b/2013/09.26.14.25.20
6. Notes
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