Regional evaluation of evapotranspiration in the Everglades

German, Edward

doi:10.3133/fs16896

Cited by 83 publications

(155 citation statements)

References 17 publications

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“…Em alguns estudos realizados em áreas alagadas (wetlands) considerou-se que as mudanças no armazenamento de calor da água foram maiores que as mudanças no armazenamento de energia na biomassa e no ar dentro do dossel (Bidlake et al, 1996;German, 2000) haja vista que a capacidade térmica da água é quase o dobro da capacidade térmica da vegetação, solo e matéria orgânica. Em estudos mencionados por Bidlake et al (1996) e German (2000 que estudam o armazenamento de energia em áreas alagadas, a vegetação deve ser mencionada de vez que, diferentemente da vegetação do presente estudo, a vegetação possuía menor porte e se encontrava completamente alagada no período de inundação.…”

Section: Resultsunclassified

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: Resultsunclassified

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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“…Water bodies affected by evaporation show increased δD and δ 18 O values along a local evaporation line (e.g., Meyers et al, 1993;Sacks, 2002;Harvey and McCormick, 2009). The variation in evaporation follows a seasonal pattern, with the lowest monthly evaporation occurring from December to February when solar radiation is the lowest, and the highest evaporation occurring from May to August (German, 2000). Additionally, evaporation rates can be limited during the end of the wet season when the availability of water at the surface is low (Duever et al, 1994;Price et al, 2008).…”

Section: Seasonal Variations In Water Isotopesmentioning

confidence: 99%

Modeling calcification periods of <i>Cytheridella ilosvayi</i> from Florida based on isotopic signatures and hydrological data

Meyer

Wrozyna

Leis³

et al. 2017

Biogeosciences

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Abstract. The isotopic signatures of ostracod shells are the result of the temperature and composition of their host water and the phenology and ecology of the target species. Investigations addressing the influence of site-specific environmental variations on the isotopic ranges of ostracod shells are still rare but can provide important information on habitatdependent variations and may signify a seasonally restricted timing of calcification periods. Here we present isotopic signatures (δ 18 O ostr , δ 13 C ostr ) of living Cytheridella ilosvayi (Ostracoda) and physical, chemical, and isotopic (δD, δ 18 O water , δ 13 C DIC ) compositions of 14 freshwater habitats (rivers, lakes, canals, marshes, sinkholes) in South Florida from winter 2013 and summer 2014. We also present instrumental data of river temperatures and δ 18 O of precipitation (δ 18 O prec ) from this region. The physicochemical and isotopic compositions of the selected sites characterize the different habitats and show the influence of the source water, biological activity, and duration of exposure to the surface. Mean δ 18 O ostr and δ 13 C ostr signatures of C. ilosvayi shells correlate well with the isotopic composition of their host waters. Within-sample variabilities in repeated isotopic measurements of single ostracod shells reflect habitat-dependent ranges. The similarly high range of ostracod δ 18 O in rivers and one marsh sample indicates that both temperature and δ 18 O prec are responsible for their variation in the whole study area. Rivers and canals, which are predominantly influenced by the input and mixing of inorganic carbon from the catchment, show smaller δ 13 C ostr ranges than the marsh dominated by local fluctuations in biological activities.Based on these observations, background data of water temperatures and δ 18 O prec were used to calculate monthly δ 18 O variations in a theoretical calcite formed in rivers in Florida assuming a direct reaction on precipitation changes.The calculated values showed a high variation coupled with low mean values during the summer wet season, while during the winter dry season the variation remains small and mean values increased. Inferred configurations were used to approximate possible calcification periods of C. ilosvayi. For a plausible calcification period, mean values and ranges of δ 18 O ostr had to be equal to the theoretical calcite with a slight positive offset (vital effect). The applied model suggests a seasonal calcification period of C. ilosvayi in early spring that is probably coupled to the hydrologic cycle of Florida.

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“…A mechanism for a relation between K c and standing water level has been proposed by German (2000), who measured ET at multiple sites in the Florida Evergladesvegetated with sawgrass, spike rush, muhly grass, and cattail; vegetation similar to that at the present study site. If canopy biomass is distributed evenly in the vertical direction, light penetration from above decreases with depth into the canopy approximately according to Beer's law.…”

Section: A Bulrush Sitementioning

confidence: 85%

“…At lower water levels, a greater proportion of dead plant material per unit horizontal area is exposed to sunlight, generating greater H at the expense of LE. We expand on German's (2000) observation by noting that lower water levels also increase the aerodynamic resistance from the water surface to the free atmosphere, further shifting the energy exchange away from the water surface, toward the upper, dead canopy. At the current study site, canopy architecture is similar to that documented in the Everglades, and although detailed measurements were not made, many photographs taken during site visits substantiate the greater density of dead plant material near the ground.…”

Section: A Bulrush Sitementioning

confidence: 99%

Evapotranspiration from marsh and open-water sites at Upper Klamath Lake, Oregon, 2008--2010

Stannard¹,

Gannett²,

Polette³

et al. 2013

Scientific Investigations Report

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Regional evaluation of evapotranspiration in the Everglades

Cited by 83 publications

References 17 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

Modeling calcification periods of <i>Cytheridella ilosvayi</i> from Florida based on isotopic signatures and hydrological data

Evapotranspiration from marsh and open-water sites at Upper Klamath Lake, Oregon, 2008--2010

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Regional evaluation of evapotranspiration in the Everglades

Cited by 83 publications

References 17 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

Modeling calcification periods of &lt;i&gt;Cytheridella ilosvayi&lt;/i&gt; from Florida based on isotopic signatures and hydrological data

Evapotranspiration from marsh and open-water sites at Upper Klamath Lake, Oregon, 2008--2010

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Modeling calcification periods of <i>Cytheridella ilosvayi</i> from Florida based on isotopic signatures and hydrological data