Evaluation of radiative transfer schemes for mesoscale model data assimilation: a case study
نویسندگان
چکیده
The assimilation of Special Sensor Microwave Imager (SSM/I) data into the Mesoscale Model 5 (MM5) allows for improving the weather forecast. However the results suggested an update the Radiative Transfer Equation (RTE) within the three-dimensional variational (3DVAR) algorithm which is tailored for non rainy conditions only. To this purpose, a new RTE algorithm is tested, in order to account for radiometric response in rainy regions. The new brightness temperatures (TB ) are estimated by using hydrometeor profiles from the MM5 mesoscale model, running with two different microphysical parameterizations. The goodness of the results is assessed by comparing the new TB with those of the original RTE algorithm in the 3DVAR code and the SSM/I observed data. The results confirm a better reliability of the new RTE compared to the old one.
منابع مشابه
Computational Study of Radiative and Convective Heat Transfer in a Cylindrical Combustion Chamber
In this paper, the effect of cold air on the fluid flow inside the cylindrical combustion chamber and its wall temperature distribution have been studied computationally, taking into account the effect of radiative heat transfer from hot gases. The results have been compared with the case that radiative heat transfer was neglected. It is observed that the reattachment length increases when incr...
متن کاملAccounting for Pliem-Xiu and NOAH Module to Simulate Dust: A Case of Western Areas of Ahwaz
Extended abstract 1- INTRODUCTION In the arid and semi-arid areas of Asia, dust storms occur frequently. Much progress has been made in the monitoring modeling and prediction of Asian dust storms. Dust emission is caused by wind erosion in the sensitive areas. Wind erosion is described as the transportation of soil particles by means of the wind. Soil Surface moisture is one of the most i...
متن کاملDevelopment of a coupled land–atmosphere satellite data assimilation system for improved local atmospheric simulations
This study developed a coupled land–atmosphere satellite data assimilation system as a new physical downscaling approach, by coupling a mesoscale atmospheric model with a land data assimilation system (LDAS). The LDAS consists of a land surface scheme as the model operator, a radiative transfer model as the observation operator, and the simulated annealing method for minimizing the difference b...
متن کاملGOES 8 aerosol optical thickness assimilation in a mesoscale model: Online integration of aerosol radiative effects
[1] To investigate the importance of aerosol radiative effects in the troposphere, numerical simulation of a dust event during the Puerto Rico Dust Experiment is presented by using the Colorado State University Regional Atmospheric Modeling System (RAMS). Through assimilation of geostationary satellite-derived aerosol optical thickness (AOT) into the RAMS, spatial and temporal aerosol distribut...
متن کاملDevelopment and validation of Gastropod, a fast radiative transfer model for the advanced sounders
Gastropod is a fast radiative transfer code designed to meet the requirements of a day one radiative transfer operator for AIRS (and eventually IASI) for use in variational data assimilation systems. This paper gives an overview of the model methodology adopted, and summarises the results from line-by-line radiative transfer model validation of the Gastropod forward model and Jacobian code for ...
متن کامل