Further developments in closure experiments for surface diffuse irradiance under cloud-free skies at a continental site

Rangasayi N. Halthore, Mark A. Miller, John A. Ogren, Patrick J. Sheridan, Donald W. Slater, Thomas Stoffel

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Direct and diffuse surface irradiances measured with the shaded and ventilated Black and White Eppley pyranometer under cloud-free skies at a continental site are compared with radiative transfer model calculated values. For the measurements in 2002, calculations of irradiance utilizing surface-measured aerosol single scattering albedo (SSA) agree with that measured to within the mutual uncertainties. For the days in 2001 and 2003, the modeled irradiance values agree with that measured only if highly absorbing aerosols of SSA ∼0.7, well below surface-measured SSA, are used. Modeled diffuse/direct irradiance ratios continue to exceed those measured in the visible and near-IR using silicon detector-based radiometers, suggesting problems with measurements and/or model estimates of atmospheric, most likely, aerosol, absorption. A detailed study is therefore required to establish the role of aerosol absorption in shortwave radiative transfer.

Original languageEnglish (US)
Pages (from-to)L07111 1-5
JournalGeophysical Research Letters
Volume31
Issue number7
DOIs
StatePublished - Apr 16 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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