High spectral resolution solar radiative transfer in absorbing and scattering media: Application to the satellite simulation

Dubuisson, P.; Buriez, J. C.; Fouquart, Y.

doi:10.1016/0022-4073(95)00134-4

Cited by 128 publications

(87 citation statements)

References 18 publications

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“…To derive the local direct aerosol forcing, we have used the GAME code (Global Atmospheric ModEl code; Dubuisson et al, 1996) set in the configuration described in Roger et al (2006). The absorption is based on the results of a line by line code (Scott, 1974) and includes the gas-phase absorbers in the short-wave region.…”

Section: Model Descriptionmentioning

confidence: 99%

Aerosol optical properties and radiative forcing in the high Himalaya based on measurements at the Nepal Climate Observatory-Pyramid site (5079 m a.s.l.)

et al. 2010

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Abstract. Intense anthropogenic emissions over the Indian sub-continent lead to the formation of layers of particulate pollution that can be transported to the high altitude regions of the Himalaya-Hindu-Kush (HKH). Aerosol particles contain a substantial fraction of strongly absorbing material, including black carbon (BC), organic compounds (OC), and dust all of which can contribute to atmospheric warming, in addition to greenhouse gases. Using a 3-year record of continuous measurements of aerosol optical properties, we present a time series of key climate relevant aerosol properties including the aerosol absorption (σ ap ) and scattering (σ sp ) coefficients as well as the single-scattering albedo (w 0 ). Results of this investigation show substantial seasonal variability of these properties, with long range transport during the pre-and post-monsoon seasons and efficient precipitation scavenging of aerosol particles during the monsoon season. The monthly averaged scattering coefficients range from 0.1 Mm −1 (monsoon) to 20 Mm −1 while the average absorption coefficients range from 0.5 Mm −1 to 3.5 Mm −1 . Both have their maximum values during the premonsoon period (April) and reach a minimum during Monsoon (July-August). This leads to dry w 0 values from 0.86 (pre-monsoon) to 0.79 (monsoon) seasons. Significant diurnal variability due to valley wind circulation is also reported. Using aerosol optical depth (AOD) measurements, Correspondence to: P. Laj (laj@lgge.obs.ujf-grenoble.fr) we calculated the resulting direct local radiative forcing due to aerosols for selected air mass cases. We found that the presence of absorbing particulate material can locally induce an additional top of the atmosphere (TOA) forcing of 10 to 20 W m −2 for the first atmospheric layer (500 m above surface). The TOA positive forcing depends on the presence of snow at the surface, and takes place preferentially during episodes of regional pollution occurring on a very regular basis in the Himalayan valleys. Warming of the first atmospheric layer is paralleled by a substantial decrease of the amount of radiation reaching the surface. The surface forcing is estimated to range from −4 to −20 W m −2 for small-scale regional pollution events and large-scale pollution events, respectively. The calculated surface forcing is also very dependent on surface albedo, with maximum values occurring over a snow-covered surface. Overall, this work presents the first estimates of aerosol direct radiative forcing over the high Himalaya based on in-situ aerosol measurements, and results suggest a TOA forcing significantly greater than the IPCC reported values for green house gases.

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Section: Model Descriptionmentioning

confidence: 99%

Aerosol optical properties and radiative forcing in the high Himalaya based on measurements at the Nepal Climate Observatory-Pyramid site (5079 m a.s.l.)

et al. 2010

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“…Therefore, the optical properties for water and ice clouds had to be changed. In the current implementation of the SW6 parameterization, the Fouquart et al (1987) and Ebert and Curry (1992) derivations for the optical properties have been used, respectively for the water and ice clouds, following Morcrette et al (2001) and Dubuisson et al (1996).…”

Section: Radiation Parameterizationsmentioning

confidence: 99%

“…The SW6 parameterization has been originally developed at ECMWF and the University of Lille and tested against the Line-By-Line (LBL) model of Dubuisson et al (1996). Thereafter, the behavior of the SW6 parameterization has been reported and compared to the previous SW4 parameterization in Iacono et al (2002) where validation against the rapid radiative transfer radiation model in both clear-sky and cloudy-sky conditions is also discussed.…”

Section: Offline Validation Of Sw6mentioning

confidence: 99%

Impact of an improved shortwave radiation scheme in the MAECHAM5 General Circulation Model

et al. 2007

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Abstract. In order to improve the representation of ozone absorption in the stratosphere of the MAECHAM5 general circulation model, the spectral resolution of the shortwave radiation parameterization used in the model has been increased from 4 to 6 bands. Two 20-years simulations with the general circulation model have been performed, one with the standard and the other with the newly introduced parameterization respectively, to evaluate the temperature and dynamical changes arising from the two different representations of the shortwave radiative transfer. In the simulation with the increased spectral resolution in the radiation parameterization, a significant warming of almost the entire model domain is reported. At the summer stratopause the temperature increase is about 6 K and alleviates the cold bias present in the model when the standard radiation scheme is used. These general circulation model results are consistent both with previous validation of the radiation scheme and with the offline clear-sky comparison performed in the current work with a discrete ordinate 4 stream scattering line by line radiative transfer model. The offline validation shows a substantial reduction of the daily averaged shortwave heating rate bias (1-2 K/day cooling) that occurs for the standard radiation parameterization in the upper stratosphere, present under a range of atmospheric conditions. Therefore, the 6 band shortwave radiation parameterization is considered to be better suited for the representation of the ozone absorption in the stratosphere than the 4 band parameterization. Concerning the dynamical response in the general circulation model, it is found that the reported warming at the summer stratopause induces stronger zonal mean zonal winds in the middle atmosphere. These stronger zonal mean zonal winds thereafter appear to produce a dynamical feedback that results inCorrespondence to: C. Cagnazzo (cagnazzo@bo.ingv.it) a dynamical warming (cooling) of the polar winter (summer) mesosphere, caused by an increased downward (upward) circulation in the winter (summer) hemisphere. In addition, the comparison of the two simulations performed with the general circulation model shows that the increase in the spectral resolution of the shortwave radiation and the associated changes in the cloud optical properties result in a warming (0.5-1 K) and moistening (3%-12%) of the upper tropical troposphere. By comparing these modeled differences with previous works, it appears that the reported changes in the solar radiation scheme contribute to improve the model mean temperature also in the troposphere.

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“…The integrated effects of atmospheric aerosol scattering and absorption, gaseous absorption and molecular scattering and underlying surface reflection effects were evaluated using the Global Atmospheric ModEl (GAME) code (Dubuisson et al, 1996;Roger et al, 2006). In the GAME code, gaseous absorption (mainly H 2 O, CO 2 and O 3 ) is calculated from the correlated k distribution (Lacis and Oinas, 1991).…”

Section: Introductionmentioning

confidence: 99%

Aerosol optical properties and direct radiative forcing based on measurements from the China Aerosol Remote Sensing Network (CARSNET) in eastern China

et al. 2018

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Abstract. Aerosol pollution in eastern China is an unfortunate consequence of the region's rapid economic and industrial growth. Here, sun photometer measurements from seven sites in the Yangtze River Delta (YRD) from 2011 to 2015 were used to characterize the climatology of aerosol microphysical and optical properties, calculate direct aerosol radiative forcing (DARF) and classify the aerosols based on size and absorption. Bimodal size distributions were found throughout the year, but larger volumes and effective radii of fine-mode particles occurred in June and September due to hygroscopic growth and/or cloud processing. Increases in the fine-mode particles in June and September caused AOD 440 nm > 1.00 at most sites, and annual mean AOD 440 nm values of 0.71-0.76 were found at the urban sites and 0.68 at the rural site. Unlike northern China, the AOD 440 nm was lower in July and August (∼ 0.40-0.60) than in January and February (0.71-0.89) due to particle dispersion associated with subtropical anticyclones in summer. Low volumes and large bandwidths of both fine-mode and coarsemode aerosol size distributions occurred in July and August because of biomass burning. Single-scattering albedos at 440 nm (SSA 440 nm ) from 0.91 to 0.94 indicated particles with relatively strong to moderate absorption. Strongly absorbing particles from biomass burning with a significant SSA wavelength dependence were found in July and August at most sites, while coarse particles in March to May were Published by Copernicus Publications on behalf of the European Geosciences Union. 406H. Che et al.: Aerosol optical properties and direct radiative forcing mineral dust. Absorbing aerosols were distributed more or less homogeneously throughout the region with absorption aerosol optical depths at 440 nm ∼ 0.04-0.06, but inter-site differences in the absorption Angström exponent indicate a degree of spatial heterogeneity in particle composition. The annual mean DARF was −93 ± 44 to −79 ± 39 W m −2 at the Earth's surface and ∼ −40 W m −2 at the top of the atmosphere (for the solar zenith angle range of 50 to 80 • ) under cloud-free conditions. The fine mode composed a major contribution of the absorbing particles in the classification scheme based on SSA, fine-mode fraction and extinction Angström exponent. This study contributes to our understanding of aerosols and regional climate/air quality, and the results will be useful for validating satellite retrievals and for improving climate models and remote sensing algorithms.

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High spectral resolution solar radiative transfer in absorbing and scattering media: Application to the satellite simulation

Cited by 128 publications

References 18 publications

Aerosol optical properties and radiative forcing in the high Himalaya based on measurements at the Nepal Climate Observatory-Pyramid site (5079 m a.s.l.)

Aerosol optical properties and radiative forcing in the high Himalaya based on measurements at the Nepal Climate Observatory-Pyramid site (5079 m a.s.l.)

Impact of an improved shortwave radiation scheme in the MAECHAM5 General Circulation Model

Aerosol optical properties and direct radiative forcing based on measurements from the China Aerosol Remote Sensing Network (CARSNET) in eastern China

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