Joint AMWG/CVWG Workshop March 6-7, 2003 Improvements in Radiation Processes Bill CollinsAndrew Conley, David Fillmore, Julia Lee-Taylor, Phil Rasch National Center for Atmospheric Research Inclusion of diagnostic aerosols Improvements in near-infrared absorption by H 2 O Update to longwave to incorporate new H 2 O continuum Joint AMWG/CVWG Workshop March 6-7, 2003 Radiative Forcing by Diagnostic Aerosols Joint AMWG/CVWG Workshop March 6-7, 2003 Global Aerosol Assimilation Climatology AnalysisNCAR CAM Aerosol Forcing Climate Impacts AVHRR Aerosol Assimilatio n Analysis Joint AMWG/CVWG Workshop March 6-7, 2003 ?Annual Mean Aerosol Mass Joint AMWG/CVWG Workshop March 6-7, 2003 ?Optical Depths for Each Species Joint AMWG/CVWG Workshop March 6-7, 2003 Clear-sky Forcing, by Species Joint AMWG/CVWG Workshop March 6-7, 2003 Clear-sky Forcing, by Species (cont) Joint AMWG/CVWG Workshop March 6-7, 2003 Clear-sky Radiative Forcing, All Aerosols TOA Joint AMWG/CVWG Workshop March 6-7, 2003 Aerosol Forcing on the Atmosphere Joint AMWG/CVWG Workshop March 6-7, 2003 ?Shortwave Heating Rates Joint AMWG/CVWG Workshop March 6-7, 2003 Change in Atmospheric Temperatures T (2m) T (850 mb) 99% Significance Aerosol - Control Joint AMWG/CVWG Workshop March 6-7, 2003 Change in Temperature Profiles Joint AMWG/CVWG Workshop March 6-7, 2003 Change in Boundary Layer Height 99% Significance Joint AMWG/CVWG Workshop March 6-7, 2003 ?Change in Residual Surface Energy Flux 99% Significance Joint AMWG/CVWG Workshop March 6-7, 2003 ?Change in Net Surface Longwave Flux 99% Significance Joint AMWG/CVWG Workshop March 6-7, 2003 ?Change in Sensible Heat Flux 99% Significance Joint AMWG/CVWG Workshop March 6-7, 2003 ?Change in Latent Heat Flux 99% Significance Joint AMWG/CVWG Workshop March 6-7, 2003 ?Perturbation to Precipitation Rates Annual DJF 95% Significance Joint AMWG/CVWG Workshop March 6-7, 2003 ?Change in Atmospheric Vertical Velocity Joint AMWG/CVWG Workshop March 6-7, 2003 ?Conclusions Characteristics of global aerosol climatology: Visible Optical Depth = 0.11 Atmospheric Forcing = 2.81 Wm -2 Atmospheric response to aerosol forcing: Increased zonal-mean vertical velocity Increased stability of boundary layer Large decreases in latent and sensible heat Statistically significant shifts in precipitation patterns Future work: response of coupled climate system Joint AMWG/CVWG Workshop March 6-7, 2003 Modifications to Clear-sky Shortwave Update interaction of SW radiation with H 2 O New H 2 O line data (updates since 1982 database used in CAM2) New treatments of H 2 O continuum absorption (no continuum treatment in CAM2) Benchmark calculations for verification: Spectral absorption from GENLN3 Radiative transfer by DISORT2 Improved procedures for parameterization Joint AMWG/CVWG Workshop March 6-7, 2003 Path to Updated Shortwave Parameterization GENLN3 Line by line model Parallel Radiation Code Benchmark Heating Rates Near-IR Absorption Spectra Updated Parameterization Parameterization Error Analysis Joint AMWG/CVWG Workshop March 6-7, 2003 Benchmark: Absorption 2.7 m Joint AMWG/CVWG Workshop March 6-7, 2003 Benchmark: Absorption (detail) Joint AMWG/CVWG Workshop March 6-7, 2003 Benchmark: Scattering Joint AMWG/CVWG Workshop March 6-7, 2003 Benchmark: Solar Spectrum Joint AMWG/CVWG Workshop March 6-7, 2003 Benchmark Heating Rates: Tropics Joint AMWG/CVWG Workshop March 6-7, 2003 Benchmark Heating Rates: High Latitude Joint AMWG/CVWG Workshop March 6-7, 2003 Benchmark Heating Rates: Mid Latitude Joint AMWG/CVWG Workshop March 6-7, 2003 Benchmark Heating Rates Joint AMWG/CVWG Workshop March 6-7, 2003 Absorption Cross-Section of H 2 O Joint AMWG/CVWG Workshop March 6-7, 2003 CAM Bands Absorption Cross-Section of H 2 O Joint AMWG/CVWG Workshop March 6-7, 2003 Fitting Procedure Joint AMWG/CVWG Workshop March 6-7, 2003 Fitting Procedure (cont). Joint AMWG/CVWG Workshop March 6-7, 2003 Fitting Procedure (cont). Joint AMWG/CVWG Workshop March 6-7, 2003 Variation of Absorption with Atmospheric State CAM2CAM2x Joint AMWG/CVWG Workshop March 6-7, 2003 Path to Updated LW Parameterization GENLN3 Line by line model Benchmark Heating Rates New Absorptivity & Emissivity Tables Updated Parameterization Error Analysis Objective: update to latest H 2 O Continuum Joint AMWG/CVWG Workshop March 6-7, 2003 Cooling with Old/New H 2 O Continua Calculations: David Kratz Joint AMWG/CVWG Workshop March 6-7, 2003 Sensitivity to H 2 O Continua Calculations: David Kratz Joint AMWG/CVWG Workshop March 6-7, 2003 Cooling with Old/New H 2 O Line Data Calculations: David Kratz Joint AMWG/CVWG Workshop March 6-7, 2003 Sensitivity to H 2 O Line Data Calculations: David Kratz