scholarly journals Implementation and evaluation of a generalized radiative transfer scheme within canopy in the soil-vegetation-atmosphere transfer (SVAT) model

2016 ◽  
Vol 121 (20) ◽  
pp. 12,145-12,163 ◽  
Author(s):  
Bo Qiu ◽  
Weidong Guo ◽  
Yongkang Xue ◽  
Qiudan Dai
Keyword(s):  
Radiative Transfer ◽  
Transfer Scheme ◽  
Svat Model

scholarly journals Impact of updated radiative transfer scheme in RACMO2.3p3 on the surface mass and energy budget of the Greenland ice sheet

2020 ◽  
Author(s):  
Christiaan T. van Dalum ◽  
Willem Jan van de Berg ◽  
Michiel R. van den Broeke
Keyword(s):  
Radiative Transfer ◽  
Energy Budget ◽  
Climate Model ◽  
Regional Climate ◽  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
Snow Melt ◽  
Transfer Scheme ◽  
Surface Mass ◽  
The Impact

Abstract. This study evaluates the impact of a new snow and ice albedo and radiative transfer scheme on the surface mass and energy budget for the Greenland ice sheet in the latest version of the regional climate model RACMO2, version 2.3p3. We also evaluate the modeled (sub)surface temperature and snow melt, as subsurface heating by radiation penetration now occurs. The results are compared to the previous model version and are evaluated against stake measurements and automatic weather station data of the K-transect and PROMICE projects. In addition, subsurface snow temperature profiles are compared at the K-transect, Summit and southeast Greenland. The surface mass balance is in good agreement with observations, and only changes considerably with respect to the previous RACMO2 version around the ice margins and in the percolation zone. Snow melt and refreezing, on the other hand, are changed more substantially in various regions due to the changed albedo representation, subsurface energy absorption and melt water percolation. Internal heating leads to considerably higher snow temperatures in summer, in agreement with observations, and introduces a shallow layer of subsurface melt.

scholarly journals A canopy radiative transfer scheme with explicit FAPAR for the interactive vegetation model ISBA-A-gs: Impact on carbon fluxes

2013 ◽  
Vol 118 (2) ◽  
pp. 888-903 ◽  
Author(s):  
Dominique Carrer ◽  
Jean-Louis Roujean ◽  
Sébastien Lafont ◽  
Jean-Christophe Calvet ◽  
Aaron Boone ◽  
...  
Keyword(s):  
Radiative Transfer ◽  
Carbon Fluxes ◽  
Vegetation Model ◽  
Transfer Scheme

scholarly journals The effect of metallicity on the atmospheres of exoplanets with fully coupled 3D hydrodynamics, equilibrium chemistry, and radiative transfer

2018 ◽  
Vol 612 ◽  
pp. A105 ◽  
Author(s):  
B. Drummond ◽  
N. J. Mayne ◽  
I. Baraffe ◽  
P. Tremblin ◽  
J. Manners ◽  
...  
Keyword(s):  
Radiative Transfer ◽  
General Circulation ◽  
Thermal Structure ◽  
Equations Of Motion ◽  
Circulation Model ◽  
Grid Cell ◽  
Phase Curve ◽  
Heating Rates ◽  
Transfer Scheme ◽  
Energy Minimisation

In this work, we have performed a series of simulations of the atmosphere of GJ 1214b assuming different metallicities using the Met Office Unified Model (UM). The UM is a general circulation model (GCM) that solves the deep, non-hydrostatic equations of motion and uses a flexible and accurate radiative transfer scheme, based on the two-stream and correlated-k approximations, to calculate the heating rates. In this work we consistently couple a well-tested Gibbs energy minimisation scheme to solve for the chemical equilibrium abundances locally in each grid cell for a general set of elemental abundances, further improving the flexibility and accuracy of the model. As the metallicity of the atmosphere is increased we find significant changes in the dynamical and thermal structure, with subsequent implications for the simulated phase curve. The trends that we find are qualitatively consistent with previous works, though with quantitative differences. We investigate in detail the effect of increasing the metallicity by splitting the mechanism into constituents, involving the mean molecular weight, the heat capacity and the opacities. We find the opacity effect to be the dominant mechanism in altering the circulation and thermal structure. This result highlights the importance of accurately computing the opacities and radiative transfer in 3D GCMs.

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