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Evaluation of radiation scheme performance within chemistry climate models

Forster, P. M. and Mayer, B. and et, al. (2011) Evaluation of radiation scheme performance within chemistry climate models. Journal of Geophysical Research, 116 (D10302), pp. 1-26. DOI: 10.1029/2010JD015361.

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Official URL: http://www.agu.org/journals/jd/jd1110/2010JD015361/2010JD015361.pdf

Abstract

This paper evaluates global mean radiatively important properties of chemistry climate models (CCMs). We evaluate stratospheric temperatures and their 1980�2000 trends, January clear sky irradiances, heating rates, and greenhouse gas radiative forcings from an offline comparison of CCM radiation codes with line�by�line models, and CCMs� representation of the solar cycle. CCM global mean temperatures and their change can give an indication of errors in radiative transfer codes and/or atmospheric composition. Biases in the global temperature climatology are generally small, although five out of 18 CCMs show biases in their climatology that likely indicate problems with their radiative transfer codes. Temperature trends also generally agree well with observations, although one model shows significant discrepancies that appear to be due to radiation errors. Heating rates and estimated temperature changes from CO2, ozone, and water vapor changes are generally well modeled. Other gases (N2O, CH4, and CFCs) have only played a minor role in stratospheric temperature change, but their heating rates have large fractional errors in many models. Models that do not account for variations in the spectrum of solar irradiance cannot properly simulate solar�induced variations in stratospheric temperature. The combined long�lived greenhouse gas global annual mean instantaneous net radiative forcing at the tropopause is within 30% of line�by�line models for all CCM radiation codes tested. Problems remain in simulating radiative forcing for stratospheric water vapor and ozone changes with errors between 3% and 200% compared to line by line models. The paper makes recommendations for CCM radiation code developers and future intercomparisons.

Document Type:Article
Title:Evaluation of radiation scheme performance within chemistry climate models
Authors:
AuthorsInstitution or Email of Authors
Forster, P. M.Univ of Leeds, Leeds, UK
Mayer, B.DLR / LMU
et, al.UNSPECIFIED
Date:2011
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:116
DOI:10.1029/2010JD015361
Page Range:pp. 1-26
Status:Published
Keywords:CCM radiation code
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space, Aeronautics, Transport
HGF - Program Themes:Earth Observation, ATM and Operation, Transport System
DLR - Research area:Raumfahrt, Aeronautics, Transport
DLR - Program:R EO - Erdbeobachtung, L AO - Air Traffic Management and Operation, V VS - Verkehrssystem
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung, L - Climate, Weather and Environment, V - Verkehrsentwicklung und Umwelt (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Remote Sensing
Deposited By: Jana Freund
Deposited On:15 Dec 2011 13:56
Last Modified:23 Jan 2014 11:36

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