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Cloud effects on atmospheric solar absorption in light of most recent surface and satellite measurements



Details

  • Journal Title:
    AIP Conference Proceedings
  • Personal Author:
  • NOAA Program & Office:
    CIRES (Cooperative Institute for Research in Environmental Sciences)
  • Description:
    At 36 locations worldwide, we estimate the cloud radiative effect (CREatm) on atmospheric solar absorption (ASRatm) by combining ground-based measurements of surface solar radiation (SSR) with collocated satellite-derived surface albedo and top-of-atmosphere net irradiance under both all-sky and clear-sky conditions. To derive continuous clear-sky SSR from Baseline Surface Radiation Network (BSRN) in-situ measurements of global and diffuse SSR, we make use of the Long and Ackerman (2000) algorithm that identifies clear-sky measurements and empirically fits diurnal clear-sky irradiance functions using the cosine of the solar zenith angle as the independent variable. The 11-year average (2000-2010) CREatm (all-sky minus clear-sky) is overall positive at around +11 Wm−2 using direct measurements form ground and space, and at 4 Wm−2 in the CERES EBAF dataset. This discrepancy arises from a potential overestimation in clear-sky absorption by the satellite product or underestimation by the combined BSRN/CERES dataset. The forcing ratio R shows that clouds enhance ASRatm most distinctly at desert-like locations that overall experience little occurrence of clouds. This relationship is captured by both the combined dataset and CERES EBAF.
  • Source:
    AIP Conference Proceedings, 1810, 090003
  • DOI:
  • ISSN:
    0094-243X
  • Format:
    pdf
  • Publisher:
    AIP Publishing
  • Document Type:
    Journal Article
  • Rights Information:
    Other
  • Compliance:
    Library
  • Main Document Checksum:
    urn:sha-512:65c7037876036e8c2141d03bdadeddc55d5a52594f1867dd254cc34799ba342ea7498eb9c197bbf7bd3e05e73f91eec13beb669e6107bc2a206da54241258d65
  • Download URL:
  • File Type:
    Filetype[PDF - 1.92 MB ]
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