Assessment of clear and cloudy sky parameterizations for daily downwelling longwave radiation over different land surfaces in Florida, USA

Choi, Minha; Jacobs, Jennifer M.; Kustas, William P.

doi:10.1029/2008gl035731

Cited by 64 publications

(74 citation statements)

References 18 publications

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“…L d is typically estimated by first determining the clear-sky radiation and atmospheric emissivity (Brunt, 1932;Choi et al, 2008;Bilbao and De Miguel, 2007) and then correcting for the cloud fraction (Wang and Liang, 2009;Wang and Dickinson, 2013). The derived L d values can directly reflect the greenhouse effect of atmospheric water vapour and clouds.…”

Section: Observational Datasetsmentioning

confidence: 99%

On the suitability of current atmospheric reanalyses for regional warming studies over China

Zhou

Wang

2018

Atmos. Chem. Phys.

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Abstract. Reanalyses are widely used because they add value to routine observations by generating physically or dynamically consistent and spatiotemporally complete atmospheric fields. Existing studies include extensive discussions of the temporal suitability of reanalyses in studies of global change. This study adds to this existing work by investigating the suitability of reanalyses in studies of regional climate change, in which land-atmosphere interactions play a comparatively important role. In this study, surface air temperatures (T a ) from 12 current reanalysis products are investigated; in particular, the spatial patterns of trends in T a are examined using homogenized measurements of T a made at ∼ 2200 meteorological stations in China from 1979 to 2010. The results show that ∼ 80 % of the mean differences in T a between the reanalyses and the in situ observations can be attributed to the differences in elevation between the stations and the model grids. Thus, the T a climatologies display good skill, and these findings rebut previous reports of biases in T a . However, the biases in theT a trends in the reanalyses diverge spatially (standard deviation = 0.15-0.30 • C decade −1 using 1 • × 1 • grid cells). The simulated biases in the trends in T a correlate well with those of precipitation frequency, surface incident solar radiation (R s ) and atmospheric downward longwave radiation (L d ) among the reanalyses (r = −0.83, 0.80 and 0.77; p < 0.1) when the spatial patterns of these variables are considered. The biases in the trends in T a over southern China (on the order of −0.07 • C decade −1 ) are caused by biases in the trends in R s , L d and precipitation frequency on the order of 0.10, −0.08 and −0.06 • C decade −1 , respectively. The biases in the trends in T a over northern China (on the order of −0.12 • C decade −1 ) result jointly from those in L d and precipitation frequency. Therefore, improving the simulation of precipitation frequency and R s helps to maximize the signal component corresponding to regional climate. In addition, the analysis of T a observations helps represent regional warming in ERA-Interim and JRA-55. Incorporating vegetation dynamics in reanalyses and the use of accurate aerosol information, as in the Modern-Era Retrospective Analysis for Research and Applications, version 2 (MERRA-2), would lead to improvements in the modelling of regional warming. The use of the ensemble technique adopted in the twentieth-century atmospheric model ensemble ERA-20CM significantly narrows the uncertainties associated with regional warming in reanalyses (standard deviation = 0.15 • C decade −1 ).

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Section: Observational Datasetsmentioning

confidence: 99%

On the suitability of current atmospheric reanalyses for regional warming studies over China

Zhou

Wang

2018

Atmos. Chem. Phys.

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“…Simple models are therefore more readily applicable to local temperature and humidity atmospheric profiles characteristics (Prata 1996;Kjaersgaard et al 2007;Choi et al 2008;Kwon and Choi 2011). Brutsaert's (1975) and Prata's (1996) equations, which are based on the StefanBoltzman law with different physical parameterizations of the emissivity term, are typically used to estimate R ld under relatively homogeneous climate and topography conditions (Prata 1996;Sridhar and Elliott 2002;Duarte et al 2006;Kjaersgaard et al 2007;Choi et al 2008;Ryu et al 2008;Jang et al 2009).…”

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%

“…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). 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).…”

Section: Introductionmentioning

confidence: 99%

“…Brutsaert's (1975) and Prata's (1996) equations, which are based on the StefanBoltzman law with different physical parameterizations of the emissivity term, are typically used to estimate R ld under relatively homogeneous climate and topography conditions (Prata 1996;Sridhar and Elliott 2002;Duarte et al 2006;Kjaersgaard et al 2007;Choi et al 2008;Ryu et al 2008;Jang et al 2009). …”

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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Global atmospheric downward longwave radiation at the surface from ground‐based observations, satellite retrievals, and reanalyses

Wang

Dickinson

2013

Reviews of Geophysics

154

141

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[1] Atmospheric downward longwave radiation at the surface (L d ) varies with increasing CO 2 and other greenhouse gases. This study quantifies the uncertainties of current estimates of global L d at monthly to decadal timescales and its global climatology and trends during the past decades by a synthesis of the existing observations, reanalyses, and satellite products. We find that current L d observations have a standard deviation error of~3.5 W m À2 on a monthly scale. Citation: Wang, K., and R. E. Dickinson (2013), Global atmospheric downward longwave radiation at the surface from ground-based observations, satellite retrievals, and reanalyses, Rev. Geophys., 51, 150-185,

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Assessment of clear and cloudy sky parameterizations for daily downwelling longwave radiation over different land surfaces in Florida, USA

Cited by 64 publications

References 18 publications

On the suitability of current atmospheric reanalyses for regional warming studies over China

On the suitability of current atmospheric reanalyses for regional warming studies over China

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

Global atmospheric downward longwave radiation at the surface from ground‐based observations, satellite retrievals, and reanalyses

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