A New Paradigm for Diagnosing Contributions to Model Aerosol Forcing Error

A. L. Jones, D. R. Feldman, S. Freidenreich, D. Paynter, V. Ramaswamy, W. D. Collins, R. Pincus

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

A new paradigm in benchmark absorption-scattering radiative transfer is presented that enables both the globally averaged and spatially resolved testing of climate model radiation parameterizations in order to uncover persistent sources of biases in the aerosol instantaneous radiative effect (IRE). A proof of concept is demonstrated with the Geophysical Fluid Dynamics Laboratory AM4 and Community Earth System Model 1.2.2 climate models. Instead of prescribing atmospheric conditions and aerosols, as in prior intercomparisons, native snapshots of the atmospheric state and aerosol optical properties from the participating models are used as inputs to an accurate radiation solver to uncover model-relevant biases. These diagnostic results show that the models' aerosol IRE bias is of the same magnitude as the persistent range cited (~1 W/m2) and also varies spatially and with intrinsic aerosol optical properties. The findings underscore the significance of native model error analysis and its dispositive ability to diagnose global biases, confirming its fundamental value for the Radiative Forcing Model Intercomparison Project.

Original languageEnglish (US)
Pages (from-to)12,004-12,012
JournalGeophysical Research Letters
Volume44
Issue number23
DOIs
StatePublished - Dec 16 2017

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

Keywords

  • RFMIP
  • aerosol
  • line by line
  • native error diagnostics
  • radiative effect
  • radiative forcing

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    Jones, A. L., Feldman, D. R., Freidenreich, S., Paynter, D., Ramaswamy, V., Collins, W. D., & Pincus, R. (2017). A New Paradigm for Diagnosing Contributions to Model Aerosol Forcing Error. Geophysical Research Letters, 44(23), 12,004-12,012. https://doi.org/10.1002/2017GL075933