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An analysis of global aerosol type as retrieved by MISR

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Kahn, Ralph A., Gaitley, Barbara J.·2015·Journal of Geophysical Research: Atmospheres

Abstract

In addition to aerosol optical depth (AOD), aerosol type is required globally for climate forcing calculations, constraining aerosol transport models and other applications. However, validating satellite aerosol‐type retrievals is more challenging than testing AOD results, because aerosol type is a more complex quantity, and ground truth data are far less numerous and generally not as robust. We evaluate the Multiangle Imaging Spectroradiometer (MISR) Version 22 aerosol‐type retrievals by assessing product self‐consistency on a regional basis and by making comparisons with general expectation and with the Aerosol Robotic Network aerosol‐type climatology, as available. The results confirm and add detail to the observation that aerosol‐type discrimination improves dramatically where midvisible AOD exceeds about 0.15 or 0.2. When the aerosol‐type information content of the observations is relatively low, increased scattering‐angle range improves particle‐type sensitivity. The MISR standard, operational product discriminates among small, medium, and large particles and exhibits qualitative sensitivity to single‐scattering albedo (SSA) under good aerosol‐type retrieval conditions, providing a categorical aerosol‐type classification. MISR Ångström exponent deviates systematically from ground truth where particle types missing from the algorithm climatology are present, or where cloud contamination is likely to occur, and SSA tends to be overestimated where absorbing particles are found. We determined that the number of mixtures passing the algorithm acceptance criteria (#SuccMix) represents aerosol‐type retrieval quality effectively, providing a useful aerosol‐type quality flag.

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Metadata

Authors
Kahn, R. A., & Gaitley, B. J.
Venue
Journal of Geophysical Research: Atmospheres
Published
2015-05-14
Volume
120
Issue
9
Pages
4248-4281
ISSN
  • 0148-0227 (ISSN-L)
  • 2169-897X
  • 2169-8996
OpenAlex
W1493603917
Cited by
279
References
57
FWCI
15.32
Type
journal article
Language
en
Open access
hybrid

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CoChat. (2026). Citation check: An analysis of global aerosol type as retrieved by MISR. https://app.cochat.ai/papers/10.1002/2015jd023322
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Kahn, R. A., & Gaitley, B. J. (2015). An analysis of global aerosol type as retrieved by MISR. Journal of Geophysical Research: Atmospheres. https://doi.org/10.1002/2015jd023322

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