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Registro Completo |
Biblioteca(s): |
Embrapa Meio Ambiente. |
Data corrente: |
04/07/2007 |
Data da última atualização: |
17/03/2021 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Autoria: |
ALVALÁ, R. C. S.; GIELOW, R.; ROCHA, H. R. da; FREITAS, H. C.; LOPES, J. M.; MANZI, A. O.; RANDOW, C. von; DIAS, M. A. F. S.; CABRAL, O. M. R.; WATERLOO, M. J. |
Afiliação: |
R. C. S. ALVALA, Instituto Nacional de Pesquisas Espaciais/SP; R. GIELOW, Instituto Nacional de Pesquisas Espaciais/SP; H. R. DA ROCHA,, USP/SP; H. C. FREITAS, USP/SP; J. M. LOPES, USP; A. O. MANZI,, Instituto Nacional de Pesquisas Espaciais/SP; C. VON RANDOW, Instituto Nacional de Pesquisas Espaciais; M. A. F. S. DIAS, USP; OSVALDO MACHADO RODRIGUES CABRAL, CNPMA; M. J. WATERLOO, Vrije Universiteit Amsterdam, Amsterdam, Netherlands. |
Título: |
Intradiurnal and seasonal variability of soil temperature, heat flux, soil moisture content, and thermal properties under forest and pasture in Rondônia. |
Ano de publicação: |
2002 |
Fonte/Imprenta: |
Journal of Geophysical Research, Washington, v. 107, n. D20, p. LBA10-1 - LBA 10-20, 2002. |
Idioma: |
Inglês |
Conteúdo: |
Soil temperatures depend on the soil heat flux, an important parameter in meteorological and plant growth-energy balance models. Thus, they were measured, together with soil moisture contents, within the LBA program at forest (Reserva Jaru) and pasture (Fazenda Nossa Senhora) sites in Rondônia, Brazilian Amazonia during wet (February) and dry (August) periods of 1999. The wet period showed maxima of the heat flux into the soil around five to six times smaller at the forest than at the pasture, except for some spikes that are related to stronger solar forcing, such as those due to sunspecks in the forest. This pattern remained during the dry period, but with doubled maximum values. Also, the soil heat flux and the soil temperatures responded very significantly to the passage of cold fronts in both periods at both sites. Temperature profiles measured in the 0.10-0.40 m soil layer showed daily averages and ranges smaller at the forest than at the pasture. The daily average of the soil moisture content in the same layer, during the wet season, increased with depth at both sites, with consistently lower values at the forest. However, their ranges were smaller at the pasture, except for the 0.40 m depth. During the dry period, these ranges were much higher at the pasture, but with nearer average values. Finally, the computed daily apparent soil thermal diffusivities, volumetric heat contents, and thermal conductivities are presented, with the first ones crossed with the measured soil moisture content. MenosSoil temperatures depend on the soil heat flux, an important parameter in meteorological and plant growth-energy balance models. Thus, they were measured, together with soil moisture contents, within the LBA program at forest (Reserva Jaru) and pasture (Fazenda Nossa Senhora) sites in Rondônia, Brazilian Amazonia during wet (February) and dry (August) periods of 1999. The wet period showed maxima of the heat flux into the soil around five to six times smaller at the forest than at the pasture, except for some spikes that are related to stronger solar forcing, such as those due to sunspecks in the forest. This pattern remained during the dry period, but with doubled maximum values. Also, the soil heat flux and the soil temperatures responded very significantly to the passage of cold fronts in both periods at both sites. Temperature profiles measured in the 0.10-0.40 m soil layer showed daily averages and ranges smaller at the forest than at the pasture. The daily average of the soil moisture content in the same layer, during the wet season, increased with depth at both sites, with consistently lower values at the forest. However, their ranges were smaller at the pasture, except for the 0.40 m depth. During the dry period, these ranges were much higher at the pasture, but with nearer average values. Finally, the computed daily apparent soil thermal diffusivities, volumetric heat contents, and thermal conductivities are presented, with the first ones crossed with the measured s... Mostrar Tudo |
Palavras-Chave: |
Fluxo de calor; Variabilidade. |
Thesagro: |
Balanço de Energia; Floresta; Pastagem; Temperatura do Solo; Umidade do Solo. |
Thesaurus Nal: |
Amazonia. |
Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/163809/1/Alvala-Intradiurnal-6959.pdf
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Marc: |
LEADER 02534naa a2200325 a 4500 001 1015531 005 2021-03-17 008 2002 bl uuuu u00u1 u #d 100 1 $aALVALÁ, R. C. S. 245 $aIntradiurnal and seasonal variability of soil temperature, heat flux, soil moisture content, and thermal properties under forest and pasture in Rondônia.$h[electronic resource] 260 $c2002 520 $aSoil temperatures depend on the soil heat flux, an important parameter in meteorological and plant growth-energy balance models. Thus, they were measured, together with soil moisture contents, within the LBA program at forest (Reserva Jaru) and pasture (Fazenda Nossa Senhora) sites in Rondônia, Brazilian Amazonia during wet (February) and dry (August) periods of 1999. The wet period showed maxima of the heat flux into the soil around five to six times smaller at the forest than at the pasture, except for some spikes that are related to stronger solar forcing, such as those due to sunspecks in the forest. This pattern remained during the dry period, but with doubled maximum values. Also, the soil heat flux and the soil temperatures responded very significantly to the passage of cold fronts in both periods at both sites. Temperature profiles measured in the 0.10-0.40 m soil layer showed daily averages and ranges smaller at the forest than at the pasture. The daily average of the soil moisture content in the same layer, during the wet season, increased with depth at both sites, with consistently lower values at the forest. However, their ranges were smaller at the pasture, except for the 0.40 m depth. During the dry period, these ranges were much higher at the pasture, but with nearer average values. Finally, the computed daily apparent soil thermal diffusivities, volumetric heat contents, and thermal conductivities are presented, with the first ones crossed with the measured soil moisture content. 650 $aAmazonia 650 $aBalanço de Energia 650 $aFloresta 650 $aPastagem 650 $aTemperatura do Solo 650 $aUmidade do Solo 653 $aFluxo de calor 653 $aVariabilidade 700 1 $aGIELOW, R. 700 1 $aROCHA, H. R. da 700 1 $aFREITAS, H. C. 700 1 $aLOPES, J. M. 700 1 $aMANZI, A. O. 700 1 $aRANDOW, C. von 700 1 $aDIAS, M. A. F. S. 700 1 $aCABRAL, O. M. R. 700 1 $aWATERLOO, M. J. 773 $tJournal of Geophysical Research, Washington$gv. 107, n. D20, p. LBA10-1 - LBA 10-20, 2002.
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Embrapa Meio Ambiente (CNPMA) |
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Biblioteca(s): |
Embrapa Agricultura Digital; Embrapa Pantanal. |
Data corrente: |
26/09/2022 |
Data da última atualização: |
26/09/2022 |
Tipo da produção científica: |
Artigo em Periódico Indexado |
Circulação/Nível: |
B - 4 |
Autoria: |
LO, E. L.; YEAGER, K, M.; BERGIER, I.; DOMINGOS-LUZ, L.; SILVA, A.; MCGLUE, M. M. |
Afiliação: |
EDWARD L. LO, UNIVERSITY OF KENTUCKY; KEVIN M. YEAGER, UNIVERSITY OF KENTUCKY; IVAN BERGIER TAVARES DE LIMA, CPAP, CNPTIA; LEANDRO DOMINGOS-LUZ, UNIVERSITY OF KENTUCKY; AGUINALDO SILVA, UNIVERSIDADE FEDERAL DE MATO GROSSO DO SUL; MICHAEL M. MCGLUE, UNIVERSITY OF KENTUCKY. |
Título: |
Sediment infill of tropical floodplain lakes: rates, controls, and implications for ecosystem services. |
Ano de publicação: |
2022 |
Fonte/Imprenta: |
Frontiers in Earth Science, v. 10, 875919, May 2022. |
DOI: |
https://doi.org/10.3389/feart.2022.875919 |
Idioma: |
Inglês |
Conteúdo: |
Shallow lakes in tropical floodplains provide significant ecosystem services that can be altered by natural and anthropogenic forces. Despite their importance, little is known about the infill patterns and timescales and the magnitude of these changes in tropical floodplain lakes. Here, we present a global meta-analysis of sediment core-derived accumulation rate data for shallow floodplain lakes in tropical lowlands to quantify the timescales of basin infill. Environmental variables (e.g., sediment accumulation rates, bathymetry, surface area) were compiled from the literature or derived from remote sensing imagery, resulting in a database (n = 76 lakes) that includes various lake morphologies. Our results show an exponential increase in sediment accumulation rates in many of these lakes over the past 50 years, which we interpret as a response to growing human populations and deforestation, particularly in topographically steep watersheds with pronounced seasonal rainfall. Over centennial periods, tropical floodplain lakes accumulate sediment faster than many other extratropical lakes. The dataset suggests that complete infill of some tropical floodplain lakes will occur in as little as a few centuries. Our findings also reveal the critical environmental and human factors that influence sediment accumulation patterns and affect ecosystem services in shallow tropical floodplain lakes. These findings have important implications for water and sediment management in low latitude watersheds, many of which are located in densely populated and/or developing nations. MenosShallow lakes in tropical floodplains provide significant ecosystem services that can be altered by natural and anthropogenic forces. Despite their importance, little is known about the infill patterns and timescales and the magnitude of these changes in tropical floodplain lakes. Here, we present a global meta-analysis of sediment core-derived accumulation rate data for shallow floodplain lakes in tropical lowlands to quantify the timescales of basin infill. Environmental variables (e.g., sediment accumulation rates, bathymetry, surface area) were compiled from the literature or derived from remote sensing imagery, resulting in a database (n = 76 lakes) that includes various lake morphologies. Our results show an exponential increase in sediment accumulation rates in many of these lakes over the past 50 years, which we interpret as a response to growing human populations and deforestation, particularly in topographically steep watersheds with pronounced seasonal rainfall. Over centennial periods, tropical floodplain lakes accumulate sediment faster than many other extratropical lakes. The dataset suggests that complete infill of some tropical floodplain lakes will occur in as little as a few centuries. Our findings also reveal the critical environmental and human factors that influence sediment accumulation patterns and affect ecosystem services in shallow tropical floodplain lakes. These findings have important implications for water and sediment management in low latitude... Mostrar Tudo |
Palavras-Chave: |
210Pb; Limnogeology; Planície tropical; Radiocarbon; Radiocarbono; Sedimentation rates; Taxa de sedimentação; Tropical lowland. |
Thesagro: |
Chumbo; Desmatamento. |
Thesaurus NAL: |
Deforestation. |
Categoria do assunto: |
-- |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/1146801/1/Sediment-Infill-of-Tropical-Floodplain-2022.pdf
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Marc: |
LEADER 02526naa a2200325 a 4500 001 2146801 005 2022-09-26 008 2022 bl uuuu u00u1 u #d 024 7 $ahttps://doi.org/10.3389/feart.2022.875919$2DOI 100 1 $aLO, E. L. 245 $aSediment infill of tropical floodplain lakes$brates, controls, and implications for ecosystem services.$h[electronic resource] 260 $c2022 520 $aShallow lakes in tropical floodplains provide significant ecosystem services that can be altered by natural and anthropogenic forces. Despite their importance, little is known about the infill patterns and timescales and the magnitude of these changes in tropical floodplain lakes. Here, we present a global meta-analysis of sediment core-derived accumulation rate data for shallow floodplain lakes in tropical lowlands to quantify the timescales of basin infill. Environmental variables (e.g., sediment accumulation rates, bathymetry, surface area) were compiled from the literature or derived from remote sensing imagery, resulting in a database (n = 76 lakes) that includes various lake morphologies. Our results show an exponential increase in sediment accumulation rates in many of these lakes over the past 50 years, which we interpret as a response to growing human populations and deforestation, particularly in topographically steep watersheds with pronounced seasonal rainfall. Over centennial periods, tropical floodplain lakes accumulate sediment faster than many other extratropical lakes. The dataset suggests that complete infill of some tropical floodplain lakes will occur in as little as a few centuries. Our findings also reveal the critical environmental and human factors that influence sediment accumulation patterns and affect ecosystem services in shallow tropical floodplain lakes. These findings have important implications for water and sediment management in low latitude watersheds, many of which are located in densely populated and/or developing nations. 650 $aDeforestation 650 $aChumbo 650 $aDesmatamento 653 $a210Pb 653 $aLimnogeology 653 $aPlanície tropical 653 $aRadiocarbon 653 $aRadiocarbono 653 $aSedimentation rates 653 $aTaxa de sedimentação 653 $aTropical lowland 700 1 $aYEAGER, K, M. 700 1 $aBERGIER, I. 700 1 $aDOMINGOS-LUZ, L. 700 1 $aSILVA, A. 700 1 $aMCGLUE, M. M. 773 $tFrontiers in Earth Science$gv. 10, 875919, May 2022.
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