Comparative analysis of MODIS, MISR, and AERONET climatology over the Middle East and North Africa

• Published in: Annales Geophysicae
• Main Author: Farahat, Ashraf
• Format: Text
• Language: English
• Published: 2019
• Subjects: Aerosol Robotic Network
• Online Access: https://doi.org/10.5194/angeo-37-49-2019; https://angeo.copernicus.org/articles/37/49/2019/

Comparative analysis of Multi-angle Imaging SpectroRadiometer (MISR), Moderate Resolution Imaging Spectroradiometer (MODIS), and Aerosol Robotic Network (AERONET) aerosol optical depth (AOD) products is performed over seven AERONET stations located in the Middle East and North Africa for the period of 2000–2015. Sites are categorized into dust, biomass burning, and mixed aerosol conditions. MISR and MODIS AOD agree during high-dust seasons but MODIS tends to underestimate AOD during low-dust seasons. Over dust-dominated sites, MODIS/Terra AODs indicate a negative trend over time, while MODIS/Aqua, MISR, and AERONET depict a positive trend. A deviation between MODIS/Aqua and MODIS/Terra was observed regardless of the geographic location and data sampling. The performance of MODIS is similar over the entire region with ∼64 % of AOD within the <math xmlns="http://www.w3.org/1998/Math/MathML" id="M2" display="inline" overflow="scroll" dspmath="mathml"><mrow><mi mathvariant="normal">Δ</mi><mi mathvariant="italic">τ</mi><mo>=</mo><mo>±</mo><mn mathvariant="normal">0.05</mn><mo>±</mo><mn mathvariant="normal">0.15</mn><msub><mi mathvariant="italic">τ</mi><mi mathvariant="normal">AERO</mi></msub></mrow></math> <svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="118pt" height="13pt" class="svg-formula" dspmath="mathimg" md5hash="0fec85e652595db3573ca58e6b7dfc6a"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="angeo-37-49-2019-ie00001.svg" width="118pt" height="13pt" src="angeo-37-49-2019-ie00001.png"/></svg:svg> confidence range. MISR AOD retrievals fall within 84 % of the same confidence range for all sites examined here. Both MISR and MODIS capture aerosol climatology; however few cases were observed where one of the two sensors better captures the climatology over a certain location or AOD range than the other sensor. AERONET Level 2.0 version 3, MODIS Collection 6.1, and MISR V23 data have been used in analyzing the results presented in this study.