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Atmospheric Component

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A De Miguel – One of the best experts on this subject based on the ideXlab platform.

  • global diffuse beam and ultraviolet solar irradiance recorded in malta and Atmospheric Component influences under cloudless skies
    Solar Energy, 2015
    Co-Authors: J Bilbao, Roberto Roman, Charles Yousif, Ana Perezburgos, D Mateos, A De Miguel

    Abstract:

    Abstract Global ( G ) and diffuse ( G d ) shortwave and global erythemal (UVER) horizontal irradiances and Atmospheric Components like, total ozone column, water vapour column, aerosol optical depth were measured in Malta, at the Institute for Sustainable Energy in the south-eastern village of Marsaxlokk, in the middle of Mediterranean Sea. The effect of solar zenith angle on these irradiances is studied using the measurements and simulations developed with a radiative transfer model. Horizontal global and beam ( G b ) irradiances show a linear relation with zenith solar angle cosine. The role of ozone, scattering by gases, and aerosols is analysed. Simulation model results show that total ozone column, aerosol optical depth and Rayleigh scattering are the main drivers responsible for the behaviour of UVER variations with solar zenith angle (SZA). In the case of global and diffuse shortwave irradiance, the effect of aerosols is the principal determinant.

  • global diffuse direct and ultraviolet solar irradiance recorded in malta and Atmospheric Component influences
    Energy Procedia, 2014
    Co-Authors: J Bilbao, A De Miguel, Roberto Roman, Charles Yousif, Ana Perezburgos

    Abstract:

    Abstract Global and diffuse shortwave (SW) and global erythemal (UVER) irradiances were measured in Malta, in the middle of Mediterranean Sea. The effect of solar zenith angle on these irradiances is studied using the measurements and simulations developed with a radiative transfer model. The role of ozone, scattering by gases, and aerosols is analyzed. Results show that ozone and Rayleigh scattering are the main drivers responsible for the behavior of UVER variations with SZA. In the case of global and diffuse irradiance, the role of aerosols is the principal determinant.

Alejandro Di Luca – One of the best experts on this subject based on the ideXlab platform.

  • the Atmospheric Component of the mediterranean sea water budget in a wrf multi physics ensemble and observations
    Climate Dynamics, 2014
    Co-Authors: Alejandro Di Luca, Emmanouil Flaounas, Philippe Drobinski, Cindy Lebeaupin Brossier

    Abstract:

    The use of high resolution atmosphere–ocean coupled regional climate models to study possible future climate changes in the Mediterranean Sea requires an accurate simulation of the Atmospheric Component of the water budget (i.e., evaporation, precipitation and runoff). A specific configuration of the version 3.1 of the weather research and forecasting (WRF) regional climate model was shown to systematically overestimate the Mediterranean Sea water budget mainly due to an excess of evaporation (~1,450 mm yr−1) compared with observed estimations (~1,150 mm yr−1). In this article, a 70-member multi-physics ensemble is used to try to understand the relative importance of various sub-grid scale processes in the Mediterranean Sea water budget and to evaluate its representation by comparing simulated results with observed-based estimates. The physics ensemble was constructed by performing 70 1-year long simulations using version 3.3 of the WRF model by combining six cumulus, four surface/planetary boundary layer and three radiation schemes. Results show that evaporation variability across the multi-physics ensemble (∼10 % of the mean evaporation) is dominated by the choice of the surface layer scheme that explains more than ∼70 % of the total variance and that the overestimation of evaporation in WRF simulations is generally related with an overestimation of surface exchange coefficients due to too large values of the surface roughness parameter and/or the simulation of too unstable surface conditions. Although the influence of radiation schemes on evaporation variability is small (∼13 % of the total variance), radiation schemes strongly influence exchange coefficients and vertical humidity gradients near the surface due to modifications of temperature lapse rates. The precipitation variability across the physics ensemble (∼35 % of the mean precipitation) is dominated by the choice of both cumulus (∼55 % of the total variance) and planetary boundary layer (∼32 % of the total variance) schemes with a strong regional dependence. Most members of the ensemble underestimate total precipitation amounts with biases as large as 250 mm yr−1 over the whole Mediterranean Sea compared with ERA Interim reanalysis mainly due to an underestimation of the number of wet days. The larger number of dry days in simulations is associated with a deficit in the activation of cumulus schemes. Both radiation and planetary boundary layer schemes influence precipitation through modifications on the available water vapor in the boundary layer generally tied with changes in evaporation.

  • The Atmospheric Component of the Mediterranean Sea water budget in a WRF multi-physics ensemble and observations
    Climate Dynamics, 2014
    Co-Authors: Alejandro Di Luca, Emmanouil Flaounas, Philippe Drobinski, Cindy Lebeaupin Brossier

    Abstract:

    International audienceThe use of high resolution atmosphere-ocean coupled regional climate models to study possible future climate changes in the Mediterranean Sea requires an accurate simulation of the Atmospheric Component of the water budget (i.e., evaporation, precipitation and runoff). A specific configuration of the version 3.1 of the weather research and forecasting (WRF) regional climate model was shown to systematically overestimate the Mediterranean Sea water budget mainly due to an excess of evaporation (~1,450 mm yr-1) compared with observed estimations (~1,150 mm yr-1). In this article, a 70-member multi-physics ensemble is used to try to understand the relative importance of various sub-grid scale processes in the Mediterranean Sea water budget and to evaluate its representation by comparing simulated results with observed-based estimates. The physics ensemble was constructed by performing 70 1-year long simulations using version 3.3 of the WRF model by combining six cumulus, four surface/planetary boundary layer and three radiation schemes. Results show that evaporation variability across the multi-physics ensemble (~10 % of the mean evaporation) is dominated by the choice of the surface layer scheme that explains more than ~70 % of the total variance and that the overestimation of evaporation in WRF simulations is generally related with an overestimation of surface exchange coefficients due to too large values of the surface roughness parameter and/or the simulation of too unstable surface conditions. Although the influence of radiation schemes on evaporation variability is small (~13 % of the total variance), radiation schemes strongly influence exchange coefficients and vertical humidity gradients near the surface due to modifications of temperature lapse rates. The precipitation variability across the physics ensemble (~35 % of the mean precipitation) is dominated by the choice of both cumulus (~55 % of the total variance) and planetary boundary layer (~32 % of the total variance) schemes with a strong regional dependence. Most members of the ensemble underestimate total precipitation amounts with biases as large as 250 mm yr-1 over the whole Mediterranean Sea compared with ERA Interim reanalysis mainly due to an underestimation of the number of wet days. The larger number of dry days in simulations is associated with a deficit in the activation of cumulus schemes. Both radiation and planetary boundary layer schemes influence precipitation through modifications on the available water vapor in the boundary layer generally tied with changes in evaporation. © 2014 Springer-Verlag Berlin Heidelberg

Cindy Lebeaupin Brossier – One of the best experts on this subject based on the ideXlab platform.

  • the Atmospheric Component of the mediterranean sea water budget in a wrf multi physics ensemble and observations
    Climate Dynamics, 2014
    Co-Authors: Alejandro Di Luca, Emmanouil Flaounas, Philippe Drobinski, Cindy Lebeaupin Brossier

    Abstract:

    The use of high resolution atmosphere–ocean coupled regional climate models to study possible future climate changes in the Mediterranean Sea requires an accurate simulation of the Atmospheric Component of the water budget (i.e., evaporation, precipitation and runoff). A specific configuration of the version 3.1 of the weather research and forecasting (WRF) regional climate model was shown to systematically overestimate the Mediterranean Sea water budget mainly due to an excess of evaporation (~1,450 mm yr−1) compared with observed estimations (~1,150 mm yr−1). In this article, a 70-member multi-physics ensemble is used to try to understand the relative importance of various sub-grid scale processes in the Mediterranean Sea water budget and to evaluate its representation by comparing simulated results with observed-based estimates. The physics ensemble was constructed by performing 70 1-year long simulations using version 3.3 of the WRF model by combining six cumulus, four surface/planetary boundary layer and three radiation schemes. Results show that evaporation variability across the multi-physics ensemble (∼10 % of the mean evaporation) is dominated by the choice of the surface layer scheme that explains more than ∼70 % of the total variance and that the overestimation of evaporation in WRF simulations is generally related with an overestimation of surface exchange coefficients due to too large values of the surface roughness parameter and/or the simulation of too unstable surface conditions. Although the influence of radiation schemes on evaporation variability is small (∼13 % of the total variance), radiation schemes strongly influence exchange coefficients and vertical humidity gradients near the surface due to modifications of temperature lapse rates. The precipitation variability across the physics ensemble (∼35 % of the mean precipitation) is dominated by the choice of both cumulus (∼55 % of the total variance) and planetary boundary layer (∼32 % of the total variance) schemes with a strong regional dependence. Most members of the ensemble underestimate total precipitation amounts with biases as large as 250 mm yr−1 over the whole Mediterranean Sea compared with ERA Interim reanalysis mainly due to an underestimation of the number of wet days. The larger number of dry days in simulations is associated with a deficit in the activation of cumulus schemes. Both radiation and planetary boundary layer schemes influence precipitation through modifications on the available water vapor in the boundary layer generally tied with changes in evaporation.

  • The Atmospheric Component of the Mediterranean Sea water budget in a WRF multi-physics ensemble and observations
    Climate Dynamics, 2014
    Co-Authors: Alejandro Di Luca, Emmanouil Flaounas, Philippe Drobinski, Cindy Lebeaupin Brossier

    Abstract:

    International audienceThe use of high resolution atmosphere-ocean coupled regional climate models to study possible future climate changes in the Mediterranean Sea requires an accurate simulation of the Atmospheric Component of the water budget (i.e., evaporation, precipitation and runoff). A specific configuration of the version 3.1 of the weather research and forecasting (WRF) regional climate model was shown to systematically overestimate the Mediterranean Sea water budget mainly due to an excess of evaporation (~1,450 mm yr-1) compared with observed estimations (~1,150 mm yr-1). In this article, a 70-member multi-physics ensemble is used to try to understand the relative importance of various sub-grid scale processes in the Mediterranean Sea water budget and to evaluate its representation by comparing simulated results with observed-based estimates. The physics ensemble was constructed by performing 70 1-year long simulations using version 3.3 of the WRF model by combining six cumulus, four surface/planetary boundary layer and three radiation schemes. Results show that evaporation variability across the multi-physics ensemble (~10 % of the mean evaporation) is dominated by the choice of the surface layer scheme that explains more than ~70 % of the total variance and that the overestimation of evaporation in WRF simulations is generally related with an overestimation of surface exchange coefficients due to too large values of the surface roughness parameter and/or the simulation of too unstable surface conditions. Although the influence of radiation schemes on evaporation variability is small (~13 % of the total variance), radiation schemes strongly influence exchange coefficients and vertical humidity gradients near the surface due to modifications of temperature lapse rates. The precipitation variability across the physics ensemble (~35 % of the mean precipitation) is dominated by the choice of both cumulus (~55 % of the total variance) and planetary boundary layer (~32 % of the total variance) schemes with a strong regional dependence. Most members of the ensemble underestimate total precipitation amounts with biases as large as 250 mm yr-1 over the whole Mediterranean Sea compared with ERA Interim reanalysis mainly due to an underestimation of the number of wet days. The larger number of dry days in simulations is associated with a deficit in the activation of cumulus schemes. Both radiation and planetary boundary layer schemes influence precipitation through modifications on the available water vapor in the boundary layer generally tied with changes in evaporation. © 2014 Springer-Verlag Berlin Heidelberg