Langley Calibration Analysis of Solar Spectroradiometric Measurements: Spectral Aerosol Optical Thickness Retrievals

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dc.contributor.authorJeong, Ukkyo
dc.contributor.authorTsay, Si-Chee
dc.contributor.authorPantina, Peter
dc.contributor.authorButler, James J.
dc.contributor.authorLoftus, Adrian M.
dc.contributor.authorAbuhassan, Nader
dc.contributor.authorHerman, Jay
dc.contributor.authorDimov, Alexander
dc.contributor.authorHolben, Brent N.
dc.contributor.authorSwap, Robert J.
dc.date.accessioned2023-01-19T17:55:27Z
dc.date.available2023-01-19T17:55:27Z
dc.date.issued2018-04-06
dc.description.abstractAerosol optical thickness (τaer) is a fundamental parameter for analyzing aerosol loading and associated radiative effects. The τaer can constrain many inversion algorithms using passive/active sensor measurements to retrieve other aerosol properties and/or the abundance of trace gases. In the next wave of spectroradiometric observations from geostationary platforms, we envision that a strategically distributed network of robust, well-calibrated ground-based spectroradiometers will comprehensively complement spaceborne measurements in spectral and temporal domains. Spectral τaer can be accurately obtained from direct-Sun measurements based on the Langley calibration method, which allows for the analysis of distinct spectral features of the calibration results. In this study, we present a spectral τaer retrieval algorithm for an in-house developed, field deployable spectroradiometer instrument covering wavelengths from ultraviolet to near-infrared (UV-Vis-NIR). The spectral total optical thickness obtained from the Langley calibration method is partitioned into molecular and particulate components by utilizing a least squares method. The resulting high temporal-resolution τaer and Ångström Exponent can be used effectively for cloud screening. The new algorithm was applied to month-long measurements acquired from the rooftop at National Aeronautics and Space Administration Goddard Space Flight Center’s Building 33. The retrieved τaer demonstrated excellent agreement with those from well-calibrated Aerosol Robotic Network Sun photometers at all overlapping wavelengths (correlation coefficients higher than 0.98). In addition, empirical stray light corrections considerably improved τaer retrievals at short wavelengths in the UV. The continuous spectrum of τaer from UV-Vis-NIR spectroradiometers is expected to provide more informative constraints for retrieval of additional aerosol properties such as refractive indices, size, and bulk vertical distribution.en_US
dc.description.sponsorshipThe lead authors gratefully acknowl-edge the continuous support of NASARadiation Sciences Program, managedby Hal B. Maring, on the researchdevelopment of the SMARTLabs/SMARTspectroradiometers. We also sincerelyappreciate Darryl Kuniyuki and PaulFukumura-Sawada from NOAA/ESRL forlogistics and supporting measurementsof precise Langley events at Mauna LoaObservatory. The authors thank MichaelD. King and two anonymous reviewersfor their valuable comments and sug-gestions. The UV-Vis-NIR spectroradi-ometer data are available at https://smartlabs.gsfc.nasa.gov, and theAERONET data are available at https://aeronet.gsfc.nasa.gov.en_US
dc.description.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2017JD028262en_US
dc.format.extent18 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2h3nu-xj4t
dc.identifier.citationJeong, U., Tsay, S.-C., Pantina, P.,Butler, J. J., Loftus, A. M., Abuhassan, N.,et al. (2018). Langley calibrationanalysis of solar spectroradiometricmeasurements: Spectral aerosoloptical thickness retrievals.Journal ofGeophysical Research: Atmospheres,123,4221–4238. https://doi.org/10.1002/2017JD028262.en_US
dc.identifier.urihttps://doi.org/10.1002/2017JD028262
dc.identifier.urihttp://hdl.handle.net/11603/26677
dc.language.isoen_USen_US
dc.publisherAGUen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Joint Center for Earth Systems Technology
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.en_US
dc.rightsPublic Domain Mark 1.0*
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleLangley Calibration Analysis of Solar Spectroradiometric Measurements: Spectral Aerosol Optical Thickness Retrievalsen_US
dc.typeTexten_US
dcterms.creatorhttps://orcid.org/0000-0002-9146-1632en_US
dcterms.creatorhttps://orcid.org/0000-0002-3865-657Xen_US

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