Joint AMWG/CVWG Workshop March 6-7, 2003 Improvements in Radiation Processes Bill Collins www.cgd.ucar.edu/~wcollins Andrew Conley, David Fillmore, Julia.

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Presentation transcript:

Joint AMWG/CVWG Workshop March 6-7, 2003 Improvements in Radiation Processes Bill Collins Andrew 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