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Inferring Aerosol Optical Depth from MODIS Radiances: July 2004 Study Overview

This study focuses on calculating Aerosol Optical Depth (AOD) using MODIS radiances from July 3 to July 22, 2004. We evaluate the optical properties of aerosols by leveraging MODIS data in conjunction with GEOS-Chem atmospheric models. Essential assumptions include molecular scattering and surface reflectance impacts. We will also explore the discrepancies between MODIS and AERONET AOD measurements, utilizing reflectance ratios to infer surface albedo. This research contributes to better understanding aerosol behavior and its implications for atmospheric studies.

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Inferring Aerosol Optical Depth from MODIS Radiances: July 2004 Study Overview

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  1. Calculating AODs from MODIS radiances July 3, 2004 July 22, 2004 Easan DruryG4 - w/ Jacob group @ Harvard

  2. Inferring AODs from MODIS radiances ( and using MODIS radiances as the observational variable for constraining modeled aerosols ) αAEROSOL αMOLECULAR αSURFACE What we want! 2nd assumption 1st assumption αSURFACE αMOLECULAR αAEROSOL Molecular scattering & absorbing Aerosol scattering & absorbing Surface reflectance

  3. Inferring Surface Albedo Reflectance ratios during July-August, 2004: Visible to IR reflectances: • Top of the atmosphere reflectance for the 1x1.25 degree bin. • Regress the bottom quartile of visible to IR reflectance.

  4. GEOS-Chem optical properties

  5. Difference in 10x10km2 MODIS and AERONET AODs MODIS & AERONET AODs AERONET - MODIS AODs Fraction of Pixels used

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