A Narrow Band Longwave Radiation Model Based on Parameters Fitted to Line-by-Line Radiative Transfer Model
نویسنده
چکیده
The results from the Intercomparison of Radiation Codes Used in Climate Models (ICRCCM) (Ellingson et al. 1991) showed about ±2% differences in flux calculations between the narrowband models and line-by-bine models. Narrowband and broadband model calculations of downwelling radiance showed similar discrepancies with observations from the SPECTral Radiation Experiment (SPECTRE, see Ellingson and Wiscombe 1996) and the Atmospheric Radiation Measurement (ARM) Program (Ellingson et al. 1995). Recent experiments have produced radiation and auxiliary data sets that allow more detailed tests of models. Hence, these experiments, along with other advances in the radiation field, provide the possibility for the development of more accurate radiative transfer models. The thrust of this study is to use these developments to develop an accurate model of longwave radiative transfer for eventual use in climate applications.
منابع مشابه
Effects of Improved Radiative Transfer Modeling for Climate Simulations
The interaction of shortwave and infrared radiation in the atmosphere with clouds and greenhouse gases represents a complex process that contributes significantly to maintaining earth's climate system. For climate model simulations to become more accurate, it is essential that this process be modeled properly as verified by direct comparisons with observations and with results from a validated ...
متن کاملRadiative forcing by long-lived greenhouse gases: Calculations with the AER radiative transfer models
[1] A primary component of the observed recent climate change is the radiative forcing from increased concentrations of long-lived greenhouse gases (LLGHGs). Effective simulation of anthropogenic climate change by general circulation models (GCMs) is strongly dependent on the accurate representation of radiative processes associated with water vapor, ozone, and LLGHGs. In the context of the inc...
متن کاملAn investigation of the sensitivity of the clear-sky outgoing longwave radiation to atmospheric temperature and water vapor
[1] The rate at which the outgoing longwave radiation (OLR) responds to perturbations in temperature and moisture plays a fundamental role in determining climate sensitivity. This study examines the clear-sky OLR sensitivities to temperature and water vapor, as quantified by its partial derivatives (radiative Jacobians). The Jacobians, as computed by the Geophysical Fluid Dynamics Laboratory (G...
متن کاملThe Status of Quality Measurement Experiments in the Microwave, Longwave, and Shortwave
Spectral analyses from the Atmospheric Emitted Radiance Interferometer/Line-by-Line Radiative Transfer Model (AERI/LBLRTM) Quality Measurement Experiment (QME) have proven critical in the assessment of clear sky radiative transfer modeling capability for general circulation models (GCMs). The QME provides a mechanism for the assessment of the three critical components of the longwave spectral v...
متن کاملComparisons of Surface Longwave Radiance Between Line-by-Line Radiative Transfer Model and Atmospheric Emitted Radiance Interferometer Observations from the Atmospheric Radiation Measurement Program
Observed surface downward longwave radiances from the Atmospheric Emitted Radiance Interferometer (AERI) were compared with line-by-line radiative transfer model (LBLRTM) calculations from April 1994 to November 1996 for “clear-sky conditions” in the 800-1250 atmospheric The observed radiance data used herein were measured by the window region. Results show that the mean AERI-LBLRTM AERI at the...
متن کامل