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List of Abstracts 7correlations are largely positive and high. By examining the results of model sensitivity experiments, wedetermine the drivers of these correlation patterns. Processes affecting tracer abundances, like long-rangetransport, stratosphere-troposphere exchange, the influence of clouds and emissions can be investigatedusing this methodology. Model deficits discovered will be tackled in further model development.Observations 1.3 ID:4572 15:05Characterizing differences between AOD trends derived from MODIS-Terra and MODIS-AquaRobert Levy 1 , Lorraine Remer 2 , Ralph Kahn 2 , Gregory Leptoukh 21 SSAI2 NASA-GSFCContact: robert.c.levy@nasa.govAerosols are integral to Earth’s energy balance, and affect climate and human health. NASA’s MODerateresolution Imaging Spectroradiometers (MODIS) on the Terra and Aqua platforms retrieve global, clear-sky,aerosol optical depth (AOD) products at 10 x 10 km. Both MODIS instruments employ identical, aerosolretrieval algorithms that have been validated to retrieve AOD to within ±(0.04 + 5%) over ocean and ±(0.05+ 15%) over land. As we pass the ten-year anniversary of these sensors, we assess the MODIS-observedaerosol trends.Both sensors report statistically significant (>95% level) global increase of ~0.01/decade over ocean,although Terra’s average AOD is larger than Aqua’s by ~0.015 (~10%). Instead of diurnal differences, webelieve the 10% offset in AOD to be due to