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 | Acesso ao texto completo restrito à biblioteca da Embrapa Cerrados. Para informações adicionais entre em contato com cpac.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Cerrados. |
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Data corrente: |
17/10/2022 |
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Data da última atualização: |
17/10/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
OLIVEIRA, C. M. M. de; REZENDE, A. V.; SANO, E. E.; MATRICARDI, E. A. T.; DELGADO, R. C. |
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Afiliação: |
CARLOS MAGNO MOREIRA DE OLIVEIRA; ALBA VALÉRIA REZENDE; EDSON EYJI SANO, CPAC; ERALDO APARECIDO TRONDOLI MATRICARDI; RAFAEL COLL DELGADO. |
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Título: |
Spatiotemporal assessment of land surface temperature and vegetation in tropical urban areas. |
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Ano de publicação: |
2022 |
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Fonte/Imprenta: |
Urban Ecosystems, 2022. |
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Páginas: |
21 p. |
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DOI: |
https://doi.org/10.1007/s11252-022-01276-x |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract Land use intensifcation and expansion in urban areas increases land surface temperature (LST). Several studies have developed to evaluate the LST and its drivers in the world, but few of them have addressed the annual and seasonal efects in urban areas located in tropical regions. This study assesses the spatiotemporal relationship between LST, green vegetation cover, and built-up areas in Brasília, Federal District, Brazil. We used time series of Landsat images (2000?2019) to retrieve the LST and compare it with the normalized diference vegetation index (NDVI), normalized diference built-up index (NDBI), and surface urban heat island (SUHI). Based on our results, the NDVI values increased from 0.46 to 0.58 between 2000 and 2019. A similar increasing trend was observed for LST (24.9 °C in 2000; 32.4 °C in 2019), which indicates that the magnitude of increase of urban vegetation cover was not able to reduce LST. The highest average LST and SUHI values were observed during local spring season (September to December; 41.9 °C and−3.2 °C, respectively). During the autumn (March to June) and winter (June to September) seasons, we observed a progressive increasing trend of the LST values. The NDVI explained 80% of the surface temperature variation within areas of native vegetation and 53% in urban areas. Based on our assessment of the spatiotemporal changes of the LST as a function of normalized diference vegetation and urban spectral indices, we provided crucial information to support urban green cover planning and management that, ultimately, will improve the population's well-being. MenosAbstract Land use intensifcation and expansion in urban areas increases land surface temperature (LST). Several studies have developed to evaluate the LST and its drivers in the world, but few of them have addressed the annual and seasonal efects in urban areas located in tropical regions. This study assesses the spatiotemporal relationship between LST, green vegetation cover, and built-up areas in Brasília, Federal District, Brazil. We used time series of Landsat images (2000?2019) to retrieve the LST and compare it with the normalized diference vegetation index (NDVI), normalized diference built-up index (NDBI), and surface urban heat island (SUHI). Based on our results, the NDVI values increased from 0.46 to 0.58 between 2000 and 2019. A similar increasing trend was observed for LST (24.9 °C in 2000; 32.4 °C in 2019), which indicates that the magnitude of increase of urban vegetation cover was not able to reduce LST. The highest average LST and SUHI values were observed during local spring season (September to December; 41.9 °C and−3.2 °C, respectively). During the autumn (March to June) and winter (June to September) seasons, we observed a progressive increasing trend of the LST values. The NDVI explained 80% of the surface temperature variation within areas of native vegetation and 53% in urban areas. Based on our assessment of the spatiotemporal changes of the LST as a function of normalized diference vegetation and urban spectral indices, we provided crucial inf... Mostrar Tudo |
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Palavras-Chave: |
Desconforto térmico; Espaço verde; Ilha de calor na superfície urbana. |
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Thesagro: |
Floresta Urbana. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02360naa a2200241 a 4500
001 2147389
005 2022-10-17
008 2022 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1007/s11252-022-01276-x$2DOI
100 1 $aOLIVEIRA, C. M. M. de
245 $aSpatiotemporal assessment of land surface temperature and vegetation in tropical urban areas.$h[electronic resource]
260 $c2022
300 $a21 p.
520 $aAbstract Land use intensifcation and expansion in urban areas increases land surface temperature (LST). Several studies have developed to evaluate the LST and its drivers in the world, but few of them have addressed the annual and seasonal efects in urban areas located in tropical regions. This study assesses the spatiotemporal relationship between LST, green vegetation cover, and built-up areas in Brasília, Federal District, Brazil. We used time series of Landsat images (2000?2019) to retrieve the LST and compare it with the normalized diference vegetation index (NDVI), normalized diference built-up index (NDBI), and surface urban heat island (SUHI). Based on our results, the NDVI values increased from 0.46 to 0.58 between 2000 and 2019. A similar increasing trend was observed for LST (24.9 °C in 2000; 32.4 °C in 2019), which indicates that the magnitude of increase of urban vegetation cover was not able to reduce LST. The highest average LST and SUHI values were observed during local spring season (September to December; 41.9 °C and−3.2 °C, respectively). During the autumn (March to June) and winter (June to September) seasons, we observed a progressive increasing trend of the LST values. The NDVI explained 80% of the surface temperature variation within areas of native vegetation and 53% in urban areas. Based on our assessment of the spatiotemporal changes of the LST as a function of normalized diference vegetation and urban spectral indices, we provided crucial information to support urban green cover planning and management that, ultimately, will improve the population's well-being.
650 $aFloresta Urbana
653 $aDesconforto térmico
653 $aEspaço verde
653 $aIlha de calor na superfície urbana
700 1 $aREZENDE, A. V.
700 1 $aSANO, E. E.
700 1 $aMATRICARDI, E. A. T.
700 1 $aDELGADO, R. C.
773 $tUrban Ecosystems, 2022.
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Registro original: |
Embrapa Cerrados (CPAC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
22/12/1999 |
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Data da última atualização: |
22/12/1999 |
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Autoria: |
SPOSITO, G.; MARTIN-NETO, L.; YANG, A. |
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Afiliação: |
University of California, Berkeley; EMBRAPA-CNPDIA. |
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Título: |
Mechanisms of atrazine reactions with humic acid. |
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Ano de publicação: |
1996 |
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Fonte/Imprenta: |
In: AMERICAN GEOPHYSICAL UNION MEETING, Dec. 1996, San Francisco, CA, Estados Unidos. Abstracts... San Francisco: American Geophysical Union, 1996. |
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Páginas: |
não paginado. |
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Idioma: |
Inglês |
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Conteúdo: |
Among the post-emergent herbicides, atrazine (6-chloro-N-ethyl-N'-(1-methylethyl)-1,3,5-triazine-2,4-diamine) is the one most applied worldwide. It is also widely detected in water supplies, thus an important indicator of pesticide contamination, with growing public concern over its potential carcinogenic effects. The complexation pathways of atrazine with humic acid remain controversial, in part because of the absence of direct spectroscopic information. The basic question is whether proton-transfer and, to a lesser extent, hydrogen bonding are as important as electron-transfer in the mechanisms of reaction between atrazine and humic acid. Representative tropical and temperate-zone humic acids were reacted at pH<7 with 140 mmol mE-3 atrazine solution under exclusion of light. Infrared and electron spin resonance spectra of the resulting products gave evidence for proton-transfer and, under certain conditions, electron-transfer reactions. These spectroscopic data and those from other published studies were analyzed in terms of the molecular properties of humic acids and s-triazines, out of which emerged a guiding principle to characterize the complexation mechanisms of s-triazines with humic acid: proton-transfer is favored (and electron-transfer is disfavored) for humic acids of high acidic functional group content and for s-triazines of low basicity. Electron-transfer mechanisms are favored for humic acids of low acidic functional group content and for s-triazines of high basicity... MenosAmong the post-emergent herbicides, atrazine (6-chloro-N-ethyl-N'-(1-methylethyl)-1,3,5-triazine-2,4-diamine) is the one most applied worldwide. It is also widely detected in water supplies, thus an important indicator of pesticide contamination, with growing public concern over its potential carcinogenic effects. The complexation pathways of atrazine with humic acid remain controversial, in part because of the absence of direct spectroscopic information. The basic question is whether proton-transfer and, to a lesser extent, hydrogen bonding are as important as electron-transfer in the mechanisms of reaction between atrazine and humic acid. Representative tropical and temperate-zone humic acids were reacted at pH<7 with 140 mmol mE-3 atrazine solution under exclusion of light. Infrared and electron spin resonance spectra of the resulting products gave evidence for proton-transfer and, under certain conditions, electron-transfer reactions. These spectroscopic data and those from other published studies were analyzed in terms of the molecular properties of humic acids and s-triazines, out of which emerged a guiding principle to characterize the complexation mechanisms of s-triazines with humic acid: proton-transfer is favored (and electron-transfer is disfavored) for humic acids of high acidic functional group content and for s-triazines of low basicity. Electron-transfer mechanisms are favored for humic acids of low acidic functional group content and for s-triazines of high ... Mostrar Tudo |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02018naa a2200157 a 4500
001 1027066
005 1999-12-22
008 1996 bl --- 0-- u #d
100 1 $aSPOSITO, G.
245 $aMechanisms of atrazine reactions with humic acid.
260 $c1996
300 $anão paginado.
520 $aAmong the post-emergent herbicides, atrazine (6-chloro-N-ethyl-N'-(1-methylethyl)-1,3,5-triazine-2,4-diamine) is the one most applied worldwide. It is also widely detected in water supplies, thus an important indicator of pesticide contamination, with growing public concern over its potential carcinogenic effects. The complexation pathways of atrazine with humic acid remain controversial, in part because of the absence of direct spectroscopic information. The basic question is whether proton-transfer and, to a lesser extent, hydrogen bonding are as important as electron-transfer in the mechanisms of reaction between atrazine and humic acid. Representative tropical and temperate-zone humic acids were reacted at pH<7 with 140 mmol mE-3 atrazine solution under exclusion of light. Infrared and electron spin resonance spectra of the resulting products gave evidence for proton-transfer and, under certain conditions, electron-transfer reactions. These spectroscopic data and those from other published studies were analyzed in terms of the molecular properties of humic acids and s-triazines, out of which emerged a guiding principle to characterize the complexation mechanisms of s-triazines with humic acid: proton-transfer is favored (and electron-transfer is disfavored) for humic acids of high acidic functional group content and for s-triazines of low basicity. Electron-transfer mechanisms are favored for humic acids of low acidic functional group content and for s-triazines of high basicity...
700 1 $aMARTIN-NETO, L.
700 1 $aYANG, A.
773 $tIn: AMERICAN GEOPHYSICAL UNION MEETING, Dec. 1996, San Francisco, CA, Estados Unidos. Abstracts... San Francisco: American Geophysical Union, 1996.
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