TY - GEN
T1 - What if MODIS could measure the Q Stokes parameter?
AU - Stamnes, Snorre
AU - Stamnes, Knut
AU - Li, Wei
AU - Fan, Yongzhen
AU - Chen, Nan
AU - Tanikawa, Tomonori
AU - Stamnes, Jakob J.
N1 - Publisher Copyright:
© 2017 U.S. Government.
PY - 2017/2/22
Y1 - 2017/2/22
N2 - Simultaneous retrieval of aerosol and surface properties by means of inverse techniques based on a coupled atmosphere-surface radiative transfer model and optimal estimation can yield a considerable improvement in retrieval accuracy based on radiances measured by MERIS, MODIS, and similar instruments compared with traditional methods. There are uniqueness problems associated with radiometric remote sensing measurements (like MERIS/MODIS) that ignore polarization effects, and rely on measuring only the radiance. Use of polarization measurements is particularly important for absorbing aerosols over coastal waters as well as over bright targets such as snow-covered and bare sea ice, where it has proved difficult to retrieve aerosol single-scattering albedo from radiance-only spectrometers such as MERIS and MODIS. We use a vector radiative transfer model for the coupled atmosphere-surface system (C-VRTM) in conjunction with an Optimal Estimation/Levenberg-Marquardt (OE/LM) method to quantify how polarization measurements can be used to overcome the uniqueness problems associated with radiance-only retrieval of aerosol parameters. However, this study also indicates that even for existing radiance-only instruments like MERIS and MODIS and future instrument like OLCI, use of a C-VRTM as a forward model in the inversion can lead to significant enhancement of retrieval capabilities, and facilitate simultaneous retrieval of absorbing aerosols and marine parameters in turbid coastal environments.
AB - Simultaneous retrieval of aerosol and surface properties by means of inverse techniques based on a coupled atmosphere-surface radiative transfer model and optimal estimation can yield a considerable improvement in retrieval accuracy based on radiances measured by MERIS, MODIS, and similar instruments compared with traditional methods. There are uniqueness problems associated with radiometric remote sensing measurements (like MERIS/MODIS) that ignore polarization effects, and rely on measuring only the radiance. Use of polarization measurements is particularly important for absorbing aerosols over coastal waters as well as over bright targets such as snow-covered and bare sea ice, where it has proved difficult to retrieve aerosol single-scattering albedo from radiance-only spectrometers such as MERIS and MODIS. We use a vector radiative transfer model for the coupled atmosphere-surface system (C-VRTM) in conjunction with an Optimal Estimation/Levenberg-Marquardt (OE/LM) method to quantify how polarization measurements can be used to overcome the uniqueness problems associated with radiance-only retrieval of aerosol parameters. However, this study also indicates that even for existing radiance-only instruments like MERIS and MODIS and future instrument like OLCI, use of a C-VRTM as a forward model in the inversion can lead to significant enhancement of retrieval capabilities, and facilitate simultaneous retrieval of absorbing aerosols and marine parameters in turbid coastal environments.
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U2 - 10.1063/1.4975582
DO - 10.1063/1.4975582
M3 - Conference contribution
AN - SCOPUS:85015867244
T3 - AIP Conference Proceedings
BT - Radiation Processes in the Atmosphere and Ocean, IRS 2016
A2 - Schmutz, Werner
A2 - Davies, Roger
A2 - Egli, Luca
T2 - International Radiation Symposium 2016: Radiation Processes in the Atmosphere and Ocean, IRS 2016
Y2 - 16 April 2016 through 22 April 2016
ER -