All‐sky aerosol direct radiative effects at the ARM SGP site
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All‐sky aerosol direct radiative effects at the ARM SGP site

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  • Journal Title:
    Journal of Geophysical Research: Atmospheres
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  • Description:
    All-sky aerosol direct radiative effect (DRE) was estimated for the first time at the Atmospheric Radiation Measurement Southern Great Plains site using multiyear ground-based observations. The NASA Langley Fu-Liou radiation model was employed. Observed inputs for the radiation model include aerosol and cloud vertical extinction profile from Raman lidar; spectral aerosol optical depth, single-scattering albedo, and asymmetry factor from Aerosol Robotic Network; cloud water content profiles from radars; temperature and water vapor profiles from radiosondes; and surface shortwave spectral albedo from radiometers. A cloudy-sky radiative closure experiment was performed. The relative mean differences between modeled and observed surface downwelling shortwave total fluxes were 6% (7%) for transparent (opaque) cloudy-skies. The estimated annual mean all-sky aerosol DRE is −2.13urn:x-wiley:2169897X:media:jgrd57247:jgrd57247-math-00010.54 W m−2 at the top of atmosphere (TOA) and −5.95urn:x-wiley:2169897X:media:jgrd57247:jgrd57247-math-00020.87 W m−2 at the surface, compared to −3.00urn:x-wiley:2169897X:media:jgrd57247:jgrd57247-math-00030.58 W m−2 and −6.85urn:x-wiley:2169897X:media:jgrd57247:jgrd57247-math-00041.00 W m−2, respectively, under clear-sky conditions. The seasonal cycle of all-sky aerosol DRE is similar to that of the clear-sky, except with secondary influences of the clouds: The cloud radiative effect is strongest (most negative) in the spring, which reduces the all-sky aerosol DRE. The relative uncertainties in all-sky aerosol DRE due to measurement errors are generally comparable to those in clear-sky conditions except for the aerosol single-scattering albedo. The TOA all-sky aerosol DRE relative uncertainty due to aerosol single-scattering albedo uncertainty is larger than that in clear-sky, leading to a larger total relative uncertainty. The measurement errors in cloud properties have small effects on the all-sky aerosol DRE.
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    Journal of Geophysical Research: Atmospheres, 126, e2021JD034933
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    Journal Article
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    Submitted
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