Inversion of multiangular polarimetric measurements from the ACEPOL campaign: an application of improving aerosol property and hyperspectral ocean color retrievals

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dc.contributor.authorGao, Meng
dc.contributor.authorZhai, Peng-Wang
dc.contributor.authorFranz, Bryan A.
dc.contributor.authorKnobelspiesse, Kirk
dc.contributor.authorIbrahim, Amir
dc.contributor.authorCairns, Brian
dc.contributor.authorCraig, Susanne E.
dc.contributor.authorFu, Guangliang
dc.contributor.authorHasekamp, Otto
dc.contributor.authorHu, Yongxiang
dc.contributor.authorWerdell, P. Jeremy
dc.date.accessioned2020-06-11T15:15:27Z
dc.date.available2020-06-11T15:15:27Z
dc.date.issued2020-03-10
dc.description.abstractNASA’s Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) mission, scheduled for launch in the timeframe of late 2022 to early 2023, will carry the Ocean Color Instrument (OCI), a hyperspectral scanning radiometer, and two multi-angle polarimeters (MAP), the UMBC Hyper-Angular Rainbow Polarimeter (HARP2) and the SRON Spectro-Polarimeter for Planetary EXploration one (SPEXone). One purpose of the PACE MAPs is to better characterize aerosols properties, which can then be used to improve atmospheric correction for the retrieval of ocean color in coastal waters. Though this is theoretically promising, the use of MAP data in the atmospheric correction of collocated hyperspectral ocean color measurements has not yet been well demonstrated. In this work, we performed aerosol retrievals using the MAP measurements from the Research Scanning Polarimeter (RSP), and demonstrate its application to the atmospheric correction of hyperspectral radiometric measurements from SPEX Airborne. Both measurements were collected on the same aircraft from the Aerosol Characterization from Polarimeter and Lidar (ACEPOL) field campaign in 2017. Two cases over ocean with small aerosol loading (aerosol optical depth ∼ 0.04) are identified including collocated RSP and SPEX Airborne measurements and Aerosol Robotic Network (AERONET) in-situ observations. The aerosol retrievals are performed and compared with two options: one uses reflectance only and the other use both reflectance and polarization. It is demonstrated that polarization information helps reduce the uncertainties of aerosol microphysical and optical properties. The retrieved aerosol properties are then used to compute the contribution of atmosphere and ocean surface for atmospheric correction over the discrete bands from RSP measurements and the hyperspectral SPEX Airborne measurements. The water leaving signals determined this way are compared with both AERONET and Moderate Resolution Imaging Spectroradiometer (MODIS) Ocean Color products with good agreement. The results and lessons-learned from this work will provide a basis to fully exploit the information from the unique combination of sensors on PACE for aerosol characterization and ocean ecosystem research.en_US
dc.description.sponsorshipThe authors would like to thank the ACEPOL team for conducting the field campaign and providing the data, thank the Oregon State University team for maintaining the AERONET USC_SEAPRISM site. Funding for the ACEPOL campaign from the Radiation Sciences Program managed by Dr. Hal Maring is acknowledged. Part of this work is funded by the NWO/NSO project ACEPOL: Aerosol Characterization from Polarimeter and Lidar under project number ALW-GO/16-09. M. Gao, B. Franz, B. Cairns, K. Knobelspiesse, A. Ibrahim, S. Craig, and J. Werdell acknowledge support from the NASA PACE Project. P. Zhai acknowledges support from NASA Grant 80NSSC18K0345 under the Remote Sensing of Water Quality Program. M. Gao would like to thank Ivona Cetinic, Chris Proctor and Snorre Stamnes, Minwei Zhang for constructive discussions.en_US
dc.description.urihttps://www.atmos-meas-tech-discuss.net/amt-2020-11/en_US
dc.format.extent30 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2nzrq-vwwz
dc.identifier.citationGao, M., Zhai, P.-W., Franz, B. A., Knobelspiesse, K., Ibrahim, A., Cairns, B., Craig, S. E., Fu, G., Hasekamp, O., Hu, Y., and Werdell, P. J.: Inversion of multi-angular polarimetric measurements from the ACEPOL campaign: an application of improving aerosol property and hyperspectral ocean color retrievals, Atmos. Meas. Tech. Discuss., https://doi.org/10.5194/amt-2020-11, in review, 2020.en_US
dc.identifier.urihttps://doi.org/10.5194/amt-2020-11
dc.identifier.urihttp://hdl.handle.net/11603/18866
dc.language.isoen_USen_US
dc.publisherEGU Publicationsen_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.relation.ispartofUMBC Physics Department
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.*
dc.rightsAttribution 4.0 International*
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/*
dc.titleInversion of multiangular polarimetric measurements from the ACEPOL campaign: an application of improving aerosol property and hyperspectral ocean color retrievalsen_US
dc.typeTexten_US

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