New estimates of radiative forcing due to well mixed greenhouse gases

  1. Gunnar Myhre1,
  2. Eleanor J. Highwood2,
  3. Keith P. Shine2,
  4. Frode Stordal3

Article first published online: 7 DEC 2012

DOI: 10.1029/98GL01908

Issue

Geophysical Research Letters

Geophysical Research Letters

Volume 25, Issue 14, pages 2715–2718, 15 July 1998

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Author Information

  1. 1

    Department of Geophysics, University of Oslo, Norway

  2. 2

    Department of Meteorology, University of Reading, UK

  3. 3

    Norwegian Institute for Air Research (NILU), Norway

Publication History

  1. Issue published online: 7 DEC 2012
  2. Article first published online: 7 DEC 2012
  3. Manuscript Accepted: 8 APR 1998
  4. Manuscript Received: 9 DEC 1997

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We have performed new calculations of the radiative forcing due to changes in the concentrations of the most important well mixed greenhouse gases (WMGG) since pre-industrial time. Three radiative transfer models are used. The radiative forcing due to CO2, including shortwave absorption, is 15% lower than the previous IPCC estimate. The radiative forcing due to all the WMGG is calculated to 2.25 Wm−2, which we estimate to be accurate to within about 5%. The importance of the CFCs is increased by about 20% relative to the total effect of all WMGG compared to previous estimates. We present updates to simple forcing-concentration relationships previously used by IPCC.

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