Dr. Brent McBride Profile

Dr. Brent McBride

at Science Systems and Applications Inc.

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Proceedings Article | 30 September 2022 Paper

Assessment of polarization sensitivity of Aqua MODIS using co-incident POLDER-3 polarized measurements over marine stratocumulus clouds

Brent McBride, Xiaoxiong Xiong, Aisheng Wu

Proceedings Volume 12232, 122320E (2022) https://doi.org/10.1117/12.2633017

KEYWORDS: Cloud physics, Image registration, Earth's atmosphere, Remote sensing radiometers, Clouds, Polarization, MODIS, Scattering, Polarimetry, Mie scattering, Calibration

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Over the MODIS mission, normalized trends of Earth-view digital numbers (EV-dn) over desert calibration sites (PICS) have shown biases in several Terra MODIS reflective solar bands (RSBs) related to the changes in polarization sensitivity. The MODIS Characterization Support Team (MCST) corrects for these effects at the Level 1B stage in Collection 7 with monthly coefficient updates from NASA Ocean Biology Processing Group (OBPG). However, upcoming orbit changes for both MODIS instruments may require more frequent updates and new algorithms. In this work, we present a vicarious calibration algorithm with the potential to characterize polarization sensitivity using a single MODIS granule, across a range of angles-of-incidence (AOI). Marine stratocumulus cloud targets off the coast of South America, measured in near-real-time by Aqua-MODIS and the polarimeter POLDER-3, are used. These clouds strongly polarize light in optical wavelengths, are spatially uniform over wide areas, and are present year-round. After geo-registering both data to ~50 km superpixels, we find the polarized reflectance fit that best matches the cloud microphysics of the POLDER-3 target at 0.865 μm. We then interpolate the fit to the Aqua-MODIS target geometry. We derive polarization sensitivity coefficients for Aqua-MODIS Band 2 (0.858 μm) at a range of AOI using the POLDER-3 retrieval results for six different matchups in 2005. The results suggest that cloud development in the time between Aqua-MODIS and POLDER-3 measurements (~3 min) and simultaneous nadir overpass (SNO) distance are the main error contributions, combined with relatively low polarization sensitivity for Aqua Band 2. Even so, the derived sensitivity coefficients agree with pre-launch values within uncertainty. Therefore, simultaneous, co-incident radiometer and polarimeter data are optimal, such as from OCI and HARP-2/SPEXone on the upcoming NASA Plankton Aerosol Cloud and ocean Ecosystem (PACE) mission.

Proceedings Article | 13 September 2021 Presentation

First Results from the HARP CubeSat polarimeter

Jose Vanderlei Martins, Brent McBride, Anin Puthukkudy, Noah Sienkiewics, Xiaoguang Xu, Roberto Fernandez Borda, Lorraine Remer

Proceedings Volume 11858, 1185818 (2021) https://doi.org/10.1117/12.2600408

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The Hyper-Angular Rainbow Polarimeter (HARP) Cubesat started data collection in April 2020 from the ISS orbit and is the first Hyper-Angular imaging polarimeter in space. The HARP payload produces pushbroom images at four wavelengths (440, 550, 670 and 870nm) with up to 60 viewing angles at 670 nm and up to 20 along track angles for the other three wavelengths. HARP swath consists of 94 degs in the cross track direction, allowing for a very wide coverage around the globe, and +/-57 degs in the along track direction, providing wide scattering angle sampling for aerosol and cloud particle retrieval. The HARP satellite is still active on orbit and so far have produce a large collection of scenes providing an unprecedented demonstration of the hyperangular retrieval of cloud and aerosol properties from space. This presentation will discuss the performance of the HARP sensor in space, as well as its first results for aerosol and cloud measurements. HARP is preceded by its airborne version, the AirHARP instrument, which has flown in two NASA aircrafts to demonstrate the capabilities of the HARP payload. The HARP payload is also a precursor to the HARP-2 polarimeter that will fly on the NASA PACE mission to collect global data on aerosol and cloud particles.

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