Satellite Aerosol Comparative Analysis using the Multi-Sensor MAPSS and AeroStat, powered by Giovanni Presented at the Goddard Annual Aerosol Update, at NASA/GSFC Visitor Center, Greenbelt MD, 29-Mar-2011 Image: Aqua-MODIS true color RGB of 09-Jan-2005 (courtesy: NASA EarthObservatory and MODIS Rapid Response Teams) Charles Ichoku, Maksym Petrenko, and Greg Leptoukh

Brief History of MAPSS 2000 – MAPSS initiated to validate MODIS aerosol products at discrete sites First, MODIS subsetted over ground sites (mostly AERONET), and MAPSS was: –MODIS Aerosol Products Subset Statistics Then, MODIS water vapor team requests their data added, and it became: –MODIS Atmospheric Parameters Subset Statistics Then, AERONET data were subsetted as well, and it became: –MODIS Aerosol and Associated Parameters Spatio-Temporal Statistics 2006 ROSES-EOS Funding to Continue Maintenance (PI: Lorraine Remer) 2007 ROSES-ACCESS Funding to add Data from other Satellite Sensors 2010 – Finally Aerosol Products from other sensors have joined, and it is now: –Multi-sensor Aerosol Products Sampling System 2009 – ROSES-ACCESS Funding To Develop Statistical Analysis Tools: –Enter Sister Project: AeroStat (PI: Greg Leptoukh)

Aerosol data are available from different sensors –MODIS –MISR –OMI –POLDER –CALIOP –AERONET Hard to compare and inter-validate –Different spatial and temporal resolution –Different data access strategies MAPSS uniformly samples Level-2 aerosol products and stores resulting statistics in simple CSV files Giovanni-based WEB interface for MAPSS provides a convenient customized access to the data, with on-line plotting and data export capabilities MAPSS: Multi-sensor Aerosol Products Sampling System

Comparison of Square vs Circular Sampling from MODIS

Functions and Web Sites GIOVANNI – Level 3 Earth Science Data Visualization and Analysis MAPSS – Level 2 Aerosol Point Sampling: Timeseries & Spreadsheet AeroStat – Level 2 Aerosol Point Sampling: Scatterplots & Statistics

Outputs Time series Data Table for Spreadsheet

AERONET-Satellite AOD Differences as a Function of Number of Layers from CALIPSO Comparison of Satellite-Satellite Fine Mode Fraction at 870 nm at two locations

Future “Coherent uncertainty analysis of aerosol data products from multiple satellites” Recently Funded (2011) under: ROSES 2009 Uncertainty Analysis PI: Ichoku; Postdoc: Petrenko; Collaborators: Leptoukh, Dubovik, Omar PROJECT METHODOLOGY: Utilize MAPSS and AeroStat to do: Uncertainty Analysis at Individual Sites Global Uncertainty Analysis Maps Identification of Sources of Uncertainty Integration of Aerosol Products from Future Sensors FIRST YEAR EXPECTED MILESTONES Preliminary assessment of all available MAPSS data. Elaboration of the methodology for the uncertainty analysis. Discussion of the approach with appropriate aerosol communities (AeroCenter, GEWEX Aerosol Assessment, AEROCOM, …). Development of the analysis algorithms and software coding. Generation of test uncertainty parameters for test cases, and detailed evaluation of their relevance and importance. Preparation for archiving and visualization of uncertainty analysis results.

Acknowledgement NASA HQ Program Managers: –Hal Maring. –Martha Maiden. –Steve Berrick. For tag-team Funding support of this series of projects. AERONET Team: Brent Holben, David Giles, Ilya Slutsker Satellite Aerosol PIs: MODIS, MISR, OMI, POLDER, CALIOP