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    Academic Journals

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• The CHROMA cloud-top pressure retrieval algorithm for the Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) satellite mission.

  Authors:Andrew M. Sayer, Luca Lelli, Brian Cairns, Bastiaan van Diedenhoven, Amir Ibrahim, Kirk D. Knobelspiesse, et al.From:Atmospheric Measurement Techniques (Vol. 16, Issue 4) Peer-Reviewed

  Feb. 23, 2023321 words Brief article This paper provides the theoretical basis and simulated retrievals for the Cloud Height Retrieval from O.sub.2 Molecular Absorption (CHROMA) algorithm. Simulations are performed for the Ocean Color Instrument (OCI),...

• Effective uncertainty quantification for multi-angle polarimetric aerosol remote sensing over ocean.

  Authors:Meng Gao, Kirk Knobelspiesse, Bryan A. Franz, Peng-Wang Zhai, Andrew M. Sayer, Amir Ibrahim, et al.From:Atmospheric Measurement Techniques (Vol. 15, Issue 16) Peer-Reviewed

  Aug. 25, 2022316 words Brief article Multi-angle polarimetric (MAP) measurements can enable detailed characterization of aerosol microphysical and optical properties and improve atmospheric correction in ocean color remote sensing. Advanced retrieval...

• A geometry-dependent surface Lambertian-equivalent reflectivity product for UV-Vis retrievals - Part 2: Evaluation over open ocean

  Authors:Zachary Fasnacht, Alexander Vasilkov, David Haffner, Wenhan Qin, Joanna Joiner, Nickolay Krotkov, et al.From:Atmospheric Measurement Techniques (Vol. 12, Issue 12) Peer-Reviewed

  Dec. 19, 2019242 words Brief article Satellite-based cloud, aerosol, and trace-gas retrievals from ultraviolet (UV) and visible (Vis) wavelengths depend on the accurate representation of surface reflectivity. Current UV and Vis retrieval algorithms...

• How should we aggregate data? Methods accounting for the numerical distributions, with an assessment of aerosol optical depth.

  Authors:Andrew M. Sayer and Kirk D. KnobelspiesseFrom:Atmospheric Chemistry and Physics (Vol. 19, Issue 23) Peer-Reviewed

  Dec. 11, 2019580 words Article Many applications of geophysical data - whether from surface observations, satellite retrievals, or model simulations - rely on aggregates produced at coarser spatial (e.g. degrees) and/or temporal (e.g. daily and...

• Merging regional and global aerosol optical depth records from major available satellite products

  Authors:Larisa Sogacheva, Thomas Popp, Andrew M. Sayer, Oleg Dubovik, Michael J. Garay, Andreas Heckel, et al.From:Atmospheric Chemistry and Physics (Vol. 20, Issue 4) Peer-Reviewed

  Feb. 24, 2020328 words Brief article Satellite instruments provide a vantage point for studying aerosol loading consistently over different regions of the world. However, the typical lifetime of a single satellite platform is on the order of 5-15 years;...

• Two decades observing smoke above clouds in the south-eastern Atlantic Ocean: Deep Blue algorithm updates and validation with ORACLES field campaign data

  Authors:Andrew M. Sayer, N. Christina Hsu, Jaehwa Lee, Woogyung V. Kim, Sharon Burton, Marta A. Fenn, et al.From:Atmospheric Measurement Techniques (Vol. 12, Issue 7) Peer-Reviewed

  July 4, 2019345 words Brief article

  This study presents and evaluates an updated algorithm for quantification of absorbing aerosols above clouds (AACs) from passive satellite measurements. The focus is biomass burning in the south-eastern Atlantic...

• Satellite-Based spatiotemporal trends in [PM.sub.2.5] concentrations: China, 2004-2013

  Authors:Zongwei Ma, Xuefei Hu, Andrew M. Sayer, Robert Levy, Qiang Zhang, Yingang Xue, et al.From:Environmental Health Perspectives (Vol. 124, Issue 2) Peer-Reviewed

  Feb. 20166,570 words Report 1510LBACKGROUND: Three decades of rapid economic development is causing severe and widespread [PM.sub.2.5] (particulate matter [less than or equal to] 2.5 [micro]m) pollution in China. However, research on the health impacts...

• A review and framework for the evaluation of pixel-level uncertainty estimates in satellite aerosol remote sensing.

  Authors:Andrew M. Sayer, Yves Govaerts, Pekka Kolmonen, Antti Lipponen, Marta Luffarelli, Tero Mielonen, et al.From:Atmospheric Measurement Techniques (Vol. 13, Issue 2) Peer-Reviewed

  Feb. 3, 2020411 words Article Recent years have seen the increasing inclusion of per-retrieval prognostic (predictive) uncertainty estimates within satellite aerosol optical depth (AOD) data sets, providing users with quantitative tools to assist in...

• Validation of GRASP algorithm product from POLDER/PARASOL data and assessment of multi-angular polarimetry potential for aerosol monitoring.

  Authors:Cheng Chen, Oleg Dubovik, David Fuertes, Pavel Litvinov, Tatyana Lapyonok, Anton Lopatin, et al.From:Earth System Science Data (Vol. 12, Issue 4) Peer-Reviewed

  Dec. 22, 20201,060 words Article Proven by multiple theoretical and practical studies, multi-angular spectral polarimetry is ideal for comprehensive retrieval of properties of aerosols. Furthermore, a large number of advanced space polarimeters have...

• How should we aggregate data? Methods accounting for the numerical distributions, with an assessment of aerosol optical depth.

  Authors:Andrew M. Sayer and Kirk D. KnobelspiesseFrom:Atmospheric Chemistry and Physics (Vol. 19, Issue 23) Peer-Reviewed

  Dec. 11, 2019580 words Article Many applications of geophysical data - whether from surface observations, satellite retrievals, or model simulations - rely on aggregates produced at coarser spatial (e.g. degrees) and/or temporal (e.g. daily and...

• An AeroCom-AeroSat study: intercomparison of satellite AOD datasets for aerosol model evaluation.

  Authors:Nick Schutgens, Andrew M. Sayer, Andreas Heckel, Christina Hsu, Hiren Jethva, Gerrit de Leeuw, et al.From:Atmospheric Chemistry and Physics (Vol. 20, Issue 21) Peer-Reviewed

  Oct. 30, 2020402 words Brief article To better understand and characterize current uncertainties in the important observational constraint of climate models of aerosol optical depth (AOD), we evaluate and intercompare 14 satellite products, representing...

• Cross-calibration of S-NPP VIIRS moderate-resolution reflective solar bands against MODIS Aqua over dark water scenes

  Authors:Andrew M. Sayer, N. Christina Hsu, Corey Bettenhausen, Robert E. Holz, Jaehwa Lee, Greg Quinn, et al.From:Atmospheric Measurement Techniques (Vol. 10, Issue 4) Peer-Reviewed

  Apr. 13, 2017253 words Author abstract, Bri... The Visible Infrared Imaging Radiometer Suite (VIIRS) is being used to continue the record of Earth Science observations and data products produced routinely from National Aeronautics and Space Administration (NASA)...