Above-ground thermal energy storage rates, trunk heat fluxes and surface energy balance in a central Amazonian rainforest

Michiles, Alessandro Augusto dos Santos; Gielow, Ralf

doi:10.1016/j.agrformet.2008.01.001

Cited by 81 publications

(43 citation statements)

References 24 publications

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“…Poucos são os estudos que tratam da estimativa de armazenamento de calor na biomassa (Moore & Fisch, 1986;McCaughey & Saxton, 1988;Meesters & Vugts, 1996;Michiles & Gielow, 2008). Isto porque a estimativa da energia estocada na biomassa se torna complexa devido à variação de temperatura no dossel e no caule, o que requer um grande número de sensores (McCaughey & Saxton, 1988;Oliphant et al, 2004;Barr et al, 2006;Roupsard et al, 2006) ou um quadro matemático sofisticado (Moore & Fisch, de 1986;Meesters & Vugts , 1996).…”

Section: Introductionunclassified

Estoque de energia na biomassa e no ar do dossel de Vochysia divergens Pohl

Sanches

Silva

Lima

et al. 2014

Rev. bras. eng. agríc. ambient.

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R E S U M OA variação da energia armazenada na biomassa e no ar do dossel pode ser estimada por meio de medidas da temperatura da biomassa e do ar e da distribuição da biomassa, constituindo-se um componente significativo do balanço de energia. Apesar de que estimativas acuradas desse componente do balanço de energia são de difícil obtenção e normalmente desprezadas nos cálculos, sobretudo em análises de períodos longos. Colaborando com a compreensão do fechamento do balanço de energia existente na floresta, este trabalho estimou o estoque de energia disponível na biomassa por meio de dados micrometeorológicos em uma floresta de Vochysia divergens Pohl no Pantanal, em 2007. O armazenamento de energia na biomassa e no ar do dossel foi superior na estação chuvosa em relação à seca; entretanto, a diferença entre o valor máximo e mínimo horário foi maior durante a estação seca. Os valores de armazenamento de energia na biomassa e no ar do dossel em floresta de V. divergens no Pantanal foram, em 2007, similares à energia armazenada em outras florestas tropicais. Energy storage in the biomass and air of the canopy of Vochysia divergens Pohl A B S T R A C TThe variation of the storage energy in the biomass and in the air of the canopy can be estimated by measuring biomass and air temperature and biomass distribution being a significant component of energy balance. Nevertheless, accurate estimates of this component of energy balance are difficult to obtain and usually neglected in the calculations, especially in analysis of long periods. To understand the energy balance in the forest, this study estimated the energy stored in biomass using micrometeorological data in a forest monodominant Vochysia divergens Pohl in Pantanal in 2007. The energy stored in the biomass and in the air of the canopy (S) was higher in rainy season than in dry season, however, the difference between maximum and minimum values was higher during the dry season. The values of S in V. divergens forest in Pantanal in 2007 were similar to storage energy in the other tropical forests. Palavras-chave:área alagada balanço de energia inundação Pantanal sazonalidade

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Section: Introductionunclassified

Estoque de energia na biomassa e no ar do dossel de Vochysia divergens Pohl

Sanches

Silva

Lima

et al. 2014

Rev. bras. eng. agríc. ambient.

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“…2.1, the maximum canopy heights at YK, AR and GT were 1.8 m, 0.2-0.3 m and 20 m, respectively; therefore, the canopy heat storage at the three sites cannot be neglected. According to the studies of Jacobs et al (2008) and Michiles and Gielow (2008), taking the canopy heat storage into consideration could improve the EBR by 0.5% and 5% in middle latitude grasslands and forests (average tree height 23.5 m), respectively. The energy balance ratio was within a range of 79% to 89% in this study; thus, it seems that there were other reasons for the imbalance.…”

Section: Energy Balance Closure Of Ecmentioning

confidence: 99%

A comparison of eddy-covariance and large aperture scintillometer measurements with respect to the energy balance closure problem

Liu

Wang

et al. 2011

Hydrol. Earth Syst. Sci.

485

275

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Abstract.We analyzed the seasonal variations of energy balance components over three different surfaces: irrigated cropland (Yingke, YK), alpine meadow (A'rou, AR), and spruce forest (Guantan, GT). The energy balance components were measured using eddy covariance (EC) systems and a large aperture scintillometer (LAS) in the Heihe River Basin, China, in 2008 and 2009. We also determined the source areas of the EC and LAS measurements with a footprint model for each site and discussed the differences between the sensible heat fluxes measured with EC and LAS at AR. The results show that the main EC source areas were within a radius of 250 m at all of the sites. The main source area for the LAS (with a path length of 2390 m) stretched along a path line approximately 2000 m long and 700 m wide. The surface characteristics in the source areas changed with the season at each site, and there were characteristic seasonal variations in the energy balance components at all of the sites. The sensible heat flux was the main term of the energy budget during the dormant season. During the growing season, however, the latent heat flux dominated the energy budget, and an obvious "oasis effect" was observed at YK. The sensible heat fluxes measured by LAS at AR were larger than those measured by EC at the same site. This difference seems to be caused by the so-called energy imbalance phenomenon, the heterogeneity of the underlying surfaces, and the difference between the source areas of the LAS and EC measurements.

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“…The strong correlation of basal area with temperature and its related variables may be because leaf area scales closely with basal area (Enquist 2002); leaf area reduces the transmission of radiation to the forest interior (Asner 1998) whereas tree stems significantly absorb infrared radiation and redistribute heat under the forest canopy (Haverd et al 2007, Michiles & Gielow 2008. Fallow age predicted better than basal area the successional changes in RH, VPD and soil temperature, because it is a variable that integrates various ecosystem processes that affect the understorey environment (e.g.…”

Section: Understorey Environment and Forest Structurementioning

confidence: 99%

Environmental changes during secondary succession in a tropical dry forest in Mexico

et al. 2011

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Vegetation and environment change mutually during secondary succession, yet the idiosyncrasies of the vegetation effect on the understorey environment are poorly understood. To test whether the successional understorey environment changes predictably and is shaped by the structure and seasonality of tropical dry forests, we estimated basal area and vegetation cover, and measured understorey temperature, light and moisture conditions, in 17 plots forming a 60-y chronosequence and a mature forest. Light and air and soil temperature decreased with time (75−15% of open-sky radiation, 31.7−29.3 • C, and +2.5 • C to −0.5 • C relative to ambient, respectively), whereas relative humidity increased (67−74%). Soil water availability increased with early-successional development (−45 to −1 kPa) but decreased afterwards (to −18 kPa). The first axis of a PCA of the rainy-season environment explained 60% of the variation and was strongly related to air temperature and relative humidity. During tropical dry-forest succession, such factors may be more important than light, the reduction in which is not extreme compared with taller and more vertically stratified wet forests. Seasonality significantly affected the successional environmental gradients, which were marked mainly during the wet season. Environmental heterogeneity was higher in the wet than in the dry season, and larger for resources (light and water) than for conditions (temperature and humidity). The wet-season increase in environmental heterogeneity potentially creates differential growing scenarios; the environmental harshness of the dry season would mostly challenge seedling survival.

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Above-ground thermal energy storage rates, trunk heat fluxes and surface energy balance in a central Amazonian rainforest

Cited by 81 publications

References 24 publications

Estoque de energia na biomassa e no ar do dossel de Vochysia divergens Pohl

Estoque de energia na biomassa e no ar do dossel de Vochysia divergens Pohl

A comparison of eddy-covariance and large aperture scintillometer measurements with respect to the energy balance closure problem

Environmental changes during secondary succession in a tropical dry forest in Mexico

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