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

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

2 Joint AMWG/CVWG Workshop March 6-7, 2003 Radiative Forcing by Diagnostic Aerosols

3 Joint AMWG/CVWG Workshop March 6-7, 2003 Global Aerosol Assimilation Climatology AnalysisNCAR CAM Aerosol Forcing Climate Impacts AVHRR Aerosol Assimilatio n Analysis 1995-2000

4 Joint AMWG/CVWG Workshop March 6-7, 2003 ?Annual Mean Aerosol Mass

5 Joint AMWG/CVWG Workshop March 6-7, 2003 ?Optical Depths for Each Species

6 Joint AMWG/CVWG Workshop March 6-7, 2003 Clear-sky Forcing, by Species

7 Joint AMWG/CVWG Workshop March 6-7, 2003 Clear-sky Forcing, by Species (cont)

8 Joint AMWG/CVWG Workshop March 6-7, 2003 Clear-sky Radiative Forcing, All Aerosols TOA

9 Joint AMWG/CVWG Workshop March 6-7, 2003 Aerosol Forcing on the Atmosphere

10 Joint AMWG/CVWG Workshop March 6-7, 2003 ?Shortwave Heating Rates

11 Joint AMWG/CVWG Workshop March 6-7, 2003 Change in Atmospheric Temperatures T (2m) T (850 mb) 99% Significance Aerosol - Control

12 Joint AMWG/CVWG Workshop March 6-7, 2003 Change in Temperature Profiles

13 Joint AMWG/CVWG Workshop March 6-7, 2003 Change in Boundary Layer Height 99% Significance

14 Joint AMWG/CVWG Workshop March 6-7, 2003 ?Change in Residual Surface Energy Flux 99% Significance

15 Joint AMWG/CVWG Workshop March 6-7, 2003 ?Change in Net Surface Longwave Flux 99% Significance

16 Joint AMWG/CVWG Workshop March 6-7, 2003 ?Change in Sensible Heat Flux 99% Significance

17 Joint AMWG/CVWG Workshop March 6-7, 2003 ?Change in Latent Heat Flux 99% Significance

18 Joint AMWG/CVWG Workshop March 6-7, 2003 ?Perturbation to Precipitation Rates Annual DJF 95% Significance

19 Joint AMWG/CVWG Workshop March 6-7, 2003 ?Change in Atmospheric Vertical Velocity

20 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

21 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

22 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

23 Joint AMWG/CVWG Workshop March 6-7, 2003 Benchmark: Absorption 2.7  m 

24 Joint AMWG/CVWG Workshop March 6-7, 2003 Benchmark: Absorption (detail)

25 Joint AMWG/CVWG Workshop March 6-7, 2003 Benchmark: Scattering

26 Joint AMWG/CVWG Workshop March 6-7, 2003 Benchmark: Solar Spectrum

27 Joint AMWG/CVWG Workshop March 6-7, 2003 Benchmark Heating Rates: Tropics

28 Joint AMWG/CVWG Workshop March 6-7, 2003 Benchmark Heating Rates: High Latitude

29 Joint AMWG/CVWG Workshop March 6-7, 2003 Benchmark Heating Rates: Mid Latitude

30 Joint AMWG/CVWG Workshop March 6-7, 2003 Benchmark Heating Rates

31 Joint AMWG/CVWG Workshop March 6-7, 2003 Absorption Cross-Section of H 2 O

32 Joint AMWG/CVWG Workshop March 6-7, 2003 CAM Bands Absorption Cross-Section of H 2 O

33 Joint AMWG/CVWG Workshop March 6-7, 2003 Fitting Procedure

34 Joint AMWG/CVWG Workshop March 6-7, 2003 Fitting Procedure (cont).

35 Joint AMWG/CVWG Workshop March 6-7, 2003 Fitting Procedure (cont).

36 Joint AMWG/CVWG Workshop March 6-7, 2003 Variation of Absorption with Atmospheric State CAM2CAM2x

37 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

38 Joint AMWG/CVWG Workshop March 6-7, 2003 Cooling with Old/New H 2 O Continua Calculations: David Kratz

39 Joint AMWG/CVWG Workshop March 6-7, 2003 Sensitivity to H 2 O Continua Calculations: David Kratz

40 Joint AMWG/CVWG Workshop March 6-7, 2003 Cooling with Old/New H 2 O Line Data Calculations: David Kratz

41 Joint AMWG/CVWG Workshop March 6-7, 2003 Sensitivity to H 2 O Line Data Calculations: David Kratz

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