Retrieving Aerosol Characteristics From the PACE Mission, Part 2: Multi-Angle and Polarimetry
The Plankton, Aerosol, Clouds, ocean Ecosystem (PACE) mission presents new opportunities and new challenges in applying observations of two complementary multi-angle polarimeters for the space-based retrieval of global aerosol properties. Aerosol remote sensing from multi-angle radiometric-only obse...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2019-07-01
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| Series: | Frontiers in Environmental Science |
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| Online Access: | https://www.frontiersin.org/article/10.3389/fenvs.2019.00094/full |
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| author | Lorraine A. Remer Kirk Knobelspiesse Peng-Wang Zhai Feng Xu Olga V. Kalashnikova Jacek Chowdhary Otto Hasekamp Oleg Dubovik Lianghai Wu Ziauddin Ahmad Ziauddin Ahmad Emmanuel Boss Brian Cairns Odele Coddington Anthony B. Davis Heidi M. Dierssen David J. Diner Bryan Franz Robert Frouin Bo-Cai Gao Amir Ibrahim Amir Ibrahim Robert C. Levy J. Vanderlei Martins Ali H. Omar Omar Torres |
| author_facet | Lorraine A. Remer Kirk Knobelspiesse Peng-Wang Zhai Feng Xu Olga V. Kalashnikova Jacek Chowdhary Otto Hasekamp Oleg Dubovik Lianghai Wu Ziauddin Ahmad Ziauddin Ahmad Emmanuel Boss Brian Cairns Odele Coddington Anthony B. Davis Heidi M. Dierssen David J. Diner Bryan Franz Robert Frouin Bo-Cai Gao Amir Ibrahim Amir Ibrahim Robert C. Levy J. Vanderlei Martins Ali H. Omar Omar Torres |
| author_sort | Lorraine A. Remer |
| collection | DOAJ |
| description | The Plankton, Aerosol, Clouds, ocean Ecosystem (PACE) mission presents new opportunities and new challenges in applying observations of two complementary multi-angle polarimeters for the space-based retrieval of global aerosol properties. Aerosol remote sensing from multi-angle radiometric-only observations enables aerosol characterization to a greater degree than single-view radiometers, as demonstrated by nearly two decades of heritage instruments. Adding polarimetry to the multi-angle observations allows for the retrieval of aerosol optical depth, Angstrom exponent, parameters of size distribution, measures of aerosol absorption, complex refractive index and degree of non-sphericity of the particles, as demonstrated by two independent retrieval algorithms applied to the heritage POLarization and Directionality of the Earth's Reflectance (POLDER) instrument. The reason why this detailed particle characterization is possible is because a multi-angle polarimeter measurement contains twice the number of Degrees of Freedom of Signal (DFS) compared to an observation from a single-view radiometer. The challenges of making use of this information content involve separating surface signal from atmospheric signal, especially when the surface is optically complex and especially in the ultraviolet portion of the spectrum where we show the necessity of polarization in making that separation. The path forward is likely to involve joint retrievals that will simultaneously retrieve aerosol and surface properties, although advances will be required in radiative transfer modeling and in representing optically complex constituents in those models. Another challenge is in having the processing capability that can keep pace with the output of these instruments in an operational environment. Yet, preliminary algorithms applied to airborne multi-angle polarimeter observations offer encouraging results that demonstrate the advantages of these instruments to retrieve aerosol layer height, particle single scattering albedo, size distribution and spectral optical depth, and also show the necessity of polarization measurements, not just multi-angle radiometric measurements, to achieve these results. |
| first_indexed | 2024-12-21T08:38:14Z |
| format | Article |
| id | doaj.art-1b9c4ae7926c44cc9f972a0d6dbf6cae |
| institution | Directory Open Access Journal |
| issn | 2296-665X |
| language | English |
| last_indexed | 2024-12-21T08:38:14Z |
| publishDate | 2019-07-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Environmental Science |
| spelling | doaj.art-1b9c4ae7926c44cc9f972a0d6dbf6cae2022-12-21T19:10:01ZengFrontiers Media S.A.Frontiers in Environmental Science2296-665X2019-07-01710.3389/fenvs.2019.00094440195Retrieving Aerosol Characteristics From the PACE Mission, Part 2: Multi-Angle and PolarimetryLorraine A. Remer0Kirk Knobelspiesse1Peng-Wang Zhai2Feng Xu3Olga V. Kalashnikova4Jacek Chowdhary5Otto Hasekamp6Oleg Dubovik7Lianghai Wu8Ziauddin Ahmad9Ziauddin Ahmad10Emmanuel Boss11Brian Cairns12Odele Coddington13Anthony B. Davis14Heidi M. Dierssen15David J. Diner16Bryan Franz17Robert Frouin18Bo-Cai Gao19Amir Ibrahim20Amir Ibrahim21Robert C. Levy22J. Vanderlei Martins23Ali H. Omar24Omar Torres25Joint Center for Earth System Technology, University of Maryland Baltimore County, Baltimore, MD, United StatesOcean Ecology Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United StatesDepartment of Physics, University of Maryland Baltimore County, Baltimore, MD, United StatesJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United StatesJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United StatesNASA Goddard Institute for Space Studies, Columbia University, New York, NY, United StatesEarth Science Group, SRON Netherlands Institute for Space Research, Utrecht, NetherlandsLaboratoire d'Optique Atmosphérique, Université de Lille, Villeneuve d'Ascq, FranceEarth Science Group, SRON Netherlands Institute for Space Research, Utrecht, NetherlandsOcean Ecology Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United StatesNASA Goddard Space Flight Center, Science Application International Corp., Greenbelt, MD, United StatesSchool of Marine Sciences, University of Maine, Orono, ME, United States0NASA Goddard Institute for Space Studies, New York, NY, United States1Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, United StatesJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States2Departments of Marine Science and Geography, University of Connecticut, Groton, CT, United StatesJet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United StatesOcean Ecology Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States3Scripps Institution of Oceanography, University of California, San Diego, La Jolla, CA, United States4Naval Research Laboratory, Washington, DC, United StatesOcean Ecology Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, United States5Science Systems and Applications, Inc., Lanham, MD, United States6Laboratory for Climate and Radiation, NASA Goddard Space Flight Center, Greenbelt, MD, United StatesDepartment of Physics, University of Maryland Baltimore County, Baltimore, MD, United States7Chemistry and Dynamics Branch, NASA Langley Research Center, Hampton, VA, United States7Chemistry and Dynamics Branch, NASA Langley Research Center, Hampton, VA, United StatesThe Plankton, Aerosol, Clouds, ocean Ecosystem (PACE) mission presents new opportunities and new challenges in applying observations of two complementary multi-angle polarimeters for the space-based retrieval of global aerosol properties. Aerosol remote sensing from multi-angle radiometric-only observations enables aerosol characterization to a greater degree than single-view radiometers, as demonstrated by nearly two decades of heritage instruments. Adding polarimetry to the multi-angle observations allows for the retrieval of aerosol optical depth, Angstrom exponent, parameters of size distribution, measures of aerosol absorption, complex refractive index and degree of non-sphericity of the particles, as demonstrated by two independent retrieval algorithms applied to the heritage POLarization and Directionality of the Earth's Reflectance (POLDER) instrument. The reason why this detailed particle characterization is possible is because a multi-angle polarimeter measurement contains twice the number of Degrees of Freedom of Signal (DFS) compared to an observation from a single-view radiometer. The challenges of making use of this information content involve separating surface signal from atmospheric signal, especially when the surface is optically complex and especially in the ultraviolet portion of the spectrum where we show the necessity of polarization in making that separation. The path forward is likely to involve joint retrievals that will simultaneously retrieve aerosol and surface properties, although advances will be required in radiative transfer modeling and in representing optically complex constituents in those models. Another challenge is in having the processing capability that can keep pace with the output of these instruments in an operational environment. Yet, preliminary algorithms applied to airborne multi-angle polarimeter observations offer encouraging results that demonstrate the advantages of these instruments to retrieve aerosol layer height, particle single scattering albedo, size distribution and spectral optical depth, and also show the necessity of polarization measurements, not just multi-angle radiometric measurements, to achieve these results.https://www.frontiersin.org/article/10.3389/fenvs.2019.00094/fullaerosolmulti-anglepolarimeterPACEremote sensingmulti-wavelength |
| spellingShingle | Lorraine A. Remer Kirk Knobelspiesse Peng-Wang Zhai Feng Xu Olga V. Kalashnikova Jacek Chowdhary Otto Hasekamp Oleg Dubovik Lianghai Wu Ziauddin Ahmad Ziauddin Ahmad Emmanuel Boss Brian Cairns Odele Coddington Anthony B. Davis Heidi M. Dierssen David J. Diner Bryan Franz Robert Frouin Bo-Cai Gao Amir Ibrahim Amir Ibrahim Robert C. Levy J. Vanderlei Martins Ali H. Omar Omar Torres Retrieving Aerosol Characteristics From the PACE Mission, Part 2: Multi-Angle and Polarimetry Frontiers in Environmental Science aerosol multi-angle polarimeter PACE remote sensing multi-wavelength |
| title | Retrieving Aerosol Characteristics From the PACE Mission, Part 2: Multi-Angle and Polarimetry |
| title_full | Retrieving Aerosol Characteristics From the PACE Mission, Part 2: Multi-Angle and Polarimetry |
| title_fullStr | Retrieving Aerosol Characteristics From the PACE Mission, Part 2: Multi-Angle and Polarimetry |
| title_full_unstemmed | Retrieving Aerosol Characteristics From the PACE Mission, Part 2: Multi-Angle and Polarimetry |
| title_short | Retrieving Aerosol Characteristics From the PACE Mission, Part 2: Multi-Angle and Polarimetry |
| title_sort | retrieving aerosol characteristics from the pace mission part 2 multi angle and polarimetry |
| topic | aerosol multi-angle polarimeter PACE remote sensing multi-wavelength |
| url | https://www.frontiersin.org/article/10.3389/fenvs.2019.00094/full |
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