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Benchmark calculations of radiative forcing by greenhouse gases
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  • Robert Pincus,
  • Stefan Alexander Buehler,
  • Manfred Brath,
  • Omar Jamil,
  • Frank Evans,
  • James Manners,
  • Raymond Menzel,
  • Eli J. Mlawer,
  • David Paynter,
  • Rick Pernak,
  • Cyril Crevoisier,
  • Yoann Tellier
Robert Pincus
University of Colorado/NOAA Earth System Research Laboratory, University of Colorado/NOAA Earth System Research Laboratory

Corresponding Author:robert.pincus@colorado.edu

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Stefan Alexander Buehler
Universität Hamburg, Universität Hamburg
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Manfred Brath
University of Hamburg, University of Hamburg
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Omar Jamil
Met Office, Met Office
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Frank Evans
University of Colorado Boulder, University of Colorado Boulder
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James Manners
Met Office, Met Office
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Raymond Menzel
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Eli J. Mlawer
Atmospheric & Environmental Research, Atmospheric & Environmental Research
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David Paynter
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Rick Pernak
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Cyril Crevoisier
Laboratoire Météorologique Dynamique
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Yoann Tellier
Laboratoire Météorologique Dynamique
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Changes in the concentration of greenhouse gases within the atmosphere lead to changes in radiative fluxes within the atmosphere and at its boundaries. This paper describes an experiment within the Radiative Forcing Model Intercomparision Project that uses benchmark calculations made with line-by-line models to identify parameterization error in this quantity. The instantaneous forcing to which the world has been subject is computed using a set of 100 profiles, selected from a re-analysis of present-day conditions, that represent the global annual mean forcing with sampling errors of less than 0.01 \si{\watt\per\square\meter}. Agreement in estimates of forcing among six contributing line-by-line models is excellent, with standard deviations typically less than 0.025 \si{\watt\per\square\meter}, suggesting that parameterization error will be readily resolved. The impact of clouds on this forcing is estimated using diagnostic calculations across a range of climate models, while adjustments due to stratospheric temperature re-equilibration are estimated assuming fixed dynamical heating.
16 Dec 2020Published in Journal of Geophysical Research: Atmospheres volume 125 issue 23. 10.1029/2020JD033483