Assessing daytime downward longwave radiation estimates for clear and cloudy skies in Southern Brazil

Duarte, Henrique F.; Dias, Nelson Luı́s; Maggiotto, S. R.

doi:10.1016/j.agrformet.2006.06.008

Cited by 147 publications

(185 citation statements)

References 12 publications

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“…A emissividade da atmosfera foi calculada em função da T a e da pressão de vapor d'água do ar (e a ) obtidos da estação meteorológica no momento da passagem do satélite (Eq. (8)) (Duarte et al, 2006). …”

Section: Rn Le H Gunclassified

Balanço de Energia nas Condições de Mudanças de Uso do Solo na Região Sul do Estado de Mato Grosso

Angelini

Silva

Fausto

et al. 2017

Rev. bras. meteorol.

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A conversão da vegetação nativa para áreas agrícolas modifica a dinâmica de troca de energia no sistema soloplanta-atmosfera. Dessa forma, o objetivo deste estudo foi avaliar o efeito da conversão de uma área de Cerrado em culturas agronômicas no balanço de energia e evapotranspiração no sul do Estado de Mato Grosso. O estudo foi conduzindo em áreas de cerradão, cerrado stricto sensu, mangueiral, cultura de teca, coqueiral e pastagem. Energy Balance in Terms of Land Use Changes in the Southern of Mato Grosso State AbstractThe conversion of native vegetation to agricultural areas modifies the dynamics of energy exchange in the soil-plantatmosphere system. Thus, the objective of this study was to evaluate the effect in energy balance and evapotranspiration in the southern state of Mato Grosso due to the conversion of a Cerrado area in agronomic crops. The study was leading in areas of Cerradão, Cerrado strictu sensu, mango grove, teak culture, coconut trees and pasture. The energy balance was estimated by SEBAL (Surface Energy Balance Algorithm for Land) using weather station data and images from Landsat 5 TM sensor obtained in 2010. The net radiation showed lower values in pasture than in the Cerrado. The latent heat flux in the Cerrado was higher by 60% in relation to agronomic crops. The sensible heat flux in agricultural areas were 50% higher than Cerrado areas. The Cerradão and Mangueiral showed lower heat flux values on the ground. Although this study does not represent the entire Cerrado of Mato Grosso, the results showed the impact of the Cerrado into agricultural areas in the energy balance.

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Section: Rn Le H Gunclassified

Balanço de Energia nas Condições de Mudanças de Uso do Solo na Região Sul do Estado de Mato Grosso

Angelini

Silva

Fausto

et al. 2017

Rev. bras. meteorol.

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“…Downward long wave radiation (R ld ) is one of the most essential components of global scale energy budget research (Duarte et al 2006). In principle, it substantially influences net radiation and evapotranspiration (ET), which are critical factors in understanding surface energy distribution, hydrological cycles and water resource management at various scales (Niemelä et al 2001;Bastiaanssen et al 2005;Allen et al 2007;Choi et al 2008;Ryu et al 2008).…”

Section: Introductionmentioning

confidence: 99%

“…The R ld is mainly generated by sunlight absorption by carbon dioxide, ozone molecules and cloud water droplets in the atmosphere, along with the absorption of upward thermal radiation emitted by the surface (Idso and Jackson 1969;Mölders et al 2008). R ld can be measured directly using a pyrgeometer (Duarte et al 2006). However, this instrument is expensive, difficult to use, and not fully incorporated into the suite of normal atmospheric sensors in automated weather stations (Duarte et al 2006;Choi et al 2008;Kruk et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…R ld can be measured directly using a pyrgeometer (Duarte et al 2006). However, this instrument is expensive, difficult to use, and not fully incorporated into the suite of normal atmospheric sensors in automated weather stations (Duarte et al 2006;Choi et al 2008;Kruk et al 2010). For this reason, radiative models established using easily measurable data (i.e., air temperature and actual vapor pressure) have been commonly used to obtain R ld .…”

Section: Introductionmentioning

confidence: 99%

“…Many models that cover both clear and cloudy skies exist from complex radiative transfer models to simple empirical models (Duarte et al 2006). Radiative transfer models include low resolution atmospheric transmittance (LOWTRAN) (Kneizys et al 1983), moderate resolution atmospheric transmittance (MODTRAN) (Berk et al 1998), Streamer (Key and Schweiger 1998), and Monte-Carlo code for the physically correct tracing of photons in cloudy atmospheres (MYSTIC) (Mayer et al 1998).…”

Section: Introductionmentioning

confidence: 99%

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Satellite Based Downward Long Wave Radiation by Various Models in Northeast Asia

Sur¹,

Kim²,

Choi³

2014

Terr. Atmos. Ocean. Sci.

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Satellite-based downward long wave radiation measurement under clear sky conditions in Northeast Asia was conducted using five well-known physical models (Brunt 1932, Idso and Jackson 1969, Brutsaert 1975, Satterlund 1979, Prata 1996 with a newly proposed global R ld model (Abramowitz et al. 2012). Data from two flux towers in South Korea were used to validate downward long wave radiation. Moderate resolution imaging spectroradiometer (MODIS) atmospheric profile products were used to develop the R ld models. The overall root mean square error (RMSE) of MODIS R ld with respect to two ecosystem-type flux towers was determined to be ≈ 20 W m -2 . Based on the statistical analyses, MODIS R ld estimates with Brutsaert (1975) and Abramowitz et al. (2012) models were the most applicable for evaluating R ld for clear sky conditions in Northeast Asia. The Abramowitz R ld maps with MODIS T a and e a showed reasonable seasonal patterns, which were wellaligned with other biophysical variables reported by previous studies. The MODIS R ld map developed in this study will be very useful for identifying spatial patterns that are not detectable from ground-based R ld measurement sites.

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The contribution of reduction in evaporative cooling to higher surface air temperatures during drought

Yin

Roderick

Leech

et al. 2014

Geophysical Research Letters

107

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Higher temperatures are usually reported during meteorological drought and there are two prevailing interpretations for this observation. The first is that the increase in temperature (T) causes an increase in evaporation (E) that dries the environment. The second states that the decline in precipitation (P) during drought reduces the available water thereby decreasing E, and in turn the consequent reduction in evaporative cooling causes higher T. To test which of these interpretations is correct, we use climatic data (T, P) and a recently released database (CERES) that includes incoming and outgoing shortwave and longwave surface radiative fluxes to study meteorological drought at four sites (parts of Australia, US, and Brazil), using the Budyko approximation to calculate E. The results support the second interpretation at arid sites. The analysis also showed that increases in T due to drought have a different radiative signature from increases in T due to elevated CO 2 .

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Assessing daytime downward longwave radiation estimates for clear and cloudy skies in Southern Brazil

Cited by 147 publications

References 12 publications

Balanço de Energia nas Condições de Mudanças de Uso do Solo na Região Sul do Estado de Mato Grosso

Balanço de Energia nas Condições de Mudanças de Uso do Solo na Região Sul do Estado de Mato Grosso

Satellite Based Downward Long Wave Radiation by Various Models in Northeast Asia

The contribution of reduction in evaporative cooling to higher surface air temperatures during drought

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