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Atmospheric Composition

We are proposing to validate AURA/OMI (Ozone Monitoring Instrument) and the future NPOESS/OMPS (National Polar-orbiting Operational Environmental Satellite System/ Ozone Mapping and Profiler Suite) satellite retrievals of column NO2, O3, SO2, H2O, HCHO, and aerosol optical depth, using an existing network (5 or more) of small direct-sun viewing spectrometer systems PANDORA. The second goal is to fully characterize the absorption properties of the atmosphere in both the UV and visible as needed for photochemical and climate studies. Current shadowband data show an important increase in aerosol absorption in the UV compared to an extrapolation of the visible wavelength data from AERONET, which affects tropospheric photochemistry. The first part of the measurement plan is to distribute the PANDORA trace gas spectrometers within an OMI single-pixel field of view (FOV) to map out the sub-pixel variability to improve the satellite retrieval accuracy. The second part is to locate several PANDORA in polluted and clean areas to determine the long-term time series of NO2, O3, and other trace gases to compare with similar retrievals from OMI, SCIAMACHY (SCanning Imaging Absorption SpectroMeter for Atmospheric CartograpHY), GOME-2 (Global Ozone Monitoring Experiment-2), and the future NPOESS instruments. The comparison will validate the satellite retrieval methods under a wide variety of conditions and will validate the long-term stability of the satellite instruments, and serve as a transfer standard between different satellite instruments. The PANDORA instruments are capable of frequent (one minute) high-precision measurements, which include the overpass time for each satellite. PANDORA NO2 retrievals based on Direct Sun - Differential Optical Absorption Spectroscopy (DS-DOAS) have been validated, and are discussed in this proposal and in peer reviewed papers. The data from PANDORA have been shown to agree with the MF-DOAS instrument, from Washington State University during two field campaigns at Goddard Space Flight Center (GSFC) Greenbelt, Maryland and Table Mountain Facility (TMF), California. NO2 results showed that PANDORA has a clear-sky precision of 0.01 DU (2.69x1014 molecules/cm2) and an accuracy better than 0.1 DU

Project PI: Jay Herman/NASA/GSFC

NASA/Goddard Space Flight Center Code 613.3. Greenbelt, MD 20771

Phone: (301)614-6039

Fax: (301)614-5903

Email: jay.r.herman@nasa.gov

http://eospso.gsfc.nasa.gov/directory/get_person.php?eosDirID=eos0000695

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Started: Aug 09, 2010

Last Activity: Dec 10, 2010

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