Numerical simulation of the light field in the atmosphere–ocean system using the matrix-operator method

Fell, Frank; Fischer, Jürgen

doi:10.1016/s0022-4073(00)00089-3

Cited by 156 publications

(91 citation statements)

References 41 publications

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“…MOMO is a radiation transfer code for radiance and irradiance computations in the ocean and atmosphere (Fell and Fischer, 2001;Fischer and Grassl, 1984). Its spectral range is 0.2-100 µm.…”

Section: A28 Model #31 Matrix-operator Model (Momo; J Fischer L Domentioning

confidence: 99%

Intercomparison of shortwave radiative transfer schemes in global aerosol modeling: results from the AeroCom Radiative Transfer Experiment

et al. 2013

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Abstract. In this study we examine the performance of 31 global model radiative transfer schemes in cloud-free conditions with prescribed gaseous absorbers and no aerosols (Rayleigh atmosphere), with prescribed scattering-only aerosols, and with more absorbing aerosols. Results are compared to benchmark results from high-resolution, multi-angular line-by-line radiation models. For purely scattering aerosols, model bias relative to the line-by-line models in the top-of-the atmosphere aerosol radiative forcing ranges from roughly −10 to 20%, with over- and underestimates of radiative cooling at lower and higher solar zenith angle, respectively. Inter-model diversity (relative standard deviation) increases from ~10 to 15% as solar zenith angle decreases. Inter-model diversity in atmospheric and surface forcing decreases with increased aerosol absorption, indicating that the treatment of multiple-scattering is more variable than aerosol absorption in the models considered. Aerosol radiative forcing results from multi-stream models are generally in better agreement with the line-by-line results than the simpler two-stream schemes. Considering radiative fluxes, model performance is generally the same or slightly better than results from previous radiation scheme intercomparisons. However, the inter-model diversity in aerosol radiative forcing remains large, primarily as a result of the treatment of multiple-scattering. Results indicate that global models that estimate aerosol radiative forcing with two-stream radiation schemes may be subject to persistent biases introduced by these schemes, particularly for regional aerosol forcing.

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Section: A28 Model #31 Matrix-operator Model (Momo; J Fischer L Domentioning

confidence: 99%

Intercomparison of shortwave radiative transfer schemes in global aerosol modeling: results from the AeroCom Radiative Transfer Experiment

et al. 2013

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“…Plass et al, 1975;Mobley et al, 1993). Up to now, this description of the rough air-sea interface is generally applied for example in the HydroLight software by Mobley (1994) or in the MOMO code by Fell and Fischer (2001). The extreme variance of radiative fluxes near the surface due to the lensing effect cannot be adequately simulated with randomly distributed wave slopes.…”

Section: Introductionmentioning

confidence: 99%

Modeling of wave-induced irradiance variability in the upper ocean mixed layer

Hieronymi

Macke

2012

Ocean Sci.

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Abstract.A Monte Carlo based radiative transfer model has been developed for calculating the availability of solar radiation within the top 100 m of the ocean. The model is optimized for simulations of spatial high resolution downwelling irradiance E d fluctuations that arise from the lensing effect of waves at the water surface. In a first step the accuracy of simulation results has been verified by measurements of the oceanic underwater light field and through intercomparison with an established radiative transfer model. Secondly the potential depth-impact of nonlinear shaped single waves, from capillary to swell waves, is assessed by considering the most favorable conditions for light focusing, i.e. monochromatic light at 490 nm, very clear oceanic water with a low chlorophyll a content of 0.1 mg m −3 and high sun elevation. Finally light fields below irregular wave profiles accounting for realistic sea states were simulated. Our simulation results suggest that under open ocean conditions light flashes with 50 % irradiance enhancements can appear down to 35 m depth, and light variability in the range of ±10 % compared to the mean E d is still possible in 100 m depth.

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“…The single entries of the LUTs are calculated with the radiative transfer code MOMO. It is based on the matrix operator method [4]. MOMO calculates radiances in the solar as well as the thermal infrared spectral region.…”

Section: Methodsmentioning

confidence: 99%

Using SEVIRI radiances to retrieve cloud optical properties of convective cloud systems

Muller¹,

Fischer²,

Hünerbein³

et al. 2013

AIP Conference Proceedings

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Abstract. In this case study the development of cloud properties (cloud optical depth, effective radius and cloud top height) during the life-cycle of a convective cloud system over Europe was analyzed. To retrieve the properties we developed a retrieval scheme based on the radiative transfer code MOMO and an optimal estimation procedure. Input data are the visible to short-wavelength infrared channels from SEVIRI. In contrast to many other retrieval schemes we used 4 channels simultaneously. Especially the 3,9µm channel provides additional information due to the fact that it measures solar reflectance and thermal emission and allows the inclusion of cloud top height into the retrieval. By using a time series of SEVIRI measurements we want to provide and examine the microphysical development of the cloud over life-time. We monitored the growth of the system and found the most active parts of the convection with the highest water content and optical depth in those regions where the cloud top height is largest, too. The effective radius of the cloud particles is largest in older regions of the cloud system, where the cloud is already decaying.

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Numerical simulation of the light field in the atmosphere–ocean system using the matrix-operator method

Cited by 156 publications

References 41 publications

Intercomparison of shortwave radiative transfer schemes in global aerosol modeling: results from the AeroCom Radiative Transfer Experiment

Intercomparison of shortwave radiative transfer schemes in global aerosol modeling: results from the AeroCom Radiative Transfer Experiment

Modeling of wave-induced irradiance variability in the upper ocean mixed layer

Using SEVIRI radiances to retrieve cloud optical properties of convective cloud systems

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