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Measurements of Atmospheric Trace Gases from Space
Dr. Raid M. Suleiman of the Harvard-Smithsonian Center for Astrophysics will present his recent research.
Space borneobservations of the atmosphere provide significant knowledge about keycomponents of the Earth's troposphere and stratosphere. Knowledge gained fromobservations of the Earth spectra can be used to provide more insights into thespectra of an Exoplanet. The spectra of a technologically advanced planet willbe explained and the concept applied to an Exoplanet.
The brominemonoxide (BrO) product retrieved from observations by the Ozone MonitoringInstrument (OMI) onboard AURA will be discussed. A detailed description of thephysics of the retrieval algorithm for the OMI operational BrO product will bepresented. The algorithm is based on direct fitting of radiances from319.0-347.5 nm, within the UV-2 channel of OMI. Radiances are modeled from thesolar irradiance, attenuated by contributions from the target gas andinterfering gases, rotational Raman scattering, additive and multiplicativeclosure polynomials and a common mode spectrum. The BrO retrieval uses albedo-and wavelength-dependent air mass factors (AMFs), which have been pre-computedusing climatological BrO profiles. The wavelength-dependent AMF is appliedpre-fit to the BrO cross-sections so that vertical column densities are retrieveddirectly.
Finally, Iwill discuss Tropospheric Emissions: Monitoring of Pollution (TEMPO) as thenext instrument to advance atmospheric research. TEMPO was selected in 2012 byNASA as the first Earth Venture Instrument, for launch no earlier than November2018. It will measure atmospheric pollution for greater North America fromspace using ultraviolet and visible spectroscopy. TEMPO measures from MexicoCity to the Canadian oil sands, and from the Atlantic to the Pacific, hourlyand at high spatial resolution (~2 km N/S × 4.5 km E/W at 36.5°N, 100°W). Thecase will be made for a future TEMPO-like Middle East instrument.
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