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Detection of upper level SO 2 via the GOES Sounder

Detection of upper level SO 2 via the GOES Sounder. Fred Prata 1 , Anthony Schreiner 2 , Gary Ellrod 3 and Timothy Schmit 4 1 CSIRO Atmospheric Research, Australia 2 Cooperative Institute for Meteorological Satellite Studies (CIMSS) University of Wisconsin-Madison Madison, WI 53706, U.S.A.

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Detection of upper level SO 2 via the GOES Sounder

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  1. Detection of upper level SO2 via the GOES Sounder Fred Prata1, Anthony Schreiner2, Gary Ellrod3 and Timothy Schmit4 1CSIRO Atmospheric Research, Australia 2Cooperative Institute for Meteorological Satellite Studies (CIMSS) University of Wisconsin-Madison Madison, WI 53706, U.S.A. 3NOAA/NESDIS, Office of Research and Applications Camp Springs, Maryland 4NOAA/NESDIS, Office of Research and Applications Madison, WI 53706, U.S.A. 2nd International Conference on Volcanic Ash and Aviation Safety Alexandria, VA.

  2. The GOES Sounder

  3. The GOES Sounder

  4. SO2 from GOES • Infrared channel near 7.3 µm SO2 absorption (channel 11) • Reference channel (channel 9) • Upper-level SO2 only (>3 km) • Example – Montserrat

  5. Absorption measurement. GOES channel 11 brightness temperatures are colder than expected, because of the presence of SO2. Reference channel. A second channel is used to eliminate background effects. The O3 channel was used (channel 9). Brightness temperature difference (DBT). The DBT is related to transmittance and then to absorber amount through radiative transfer modelling. SO2 Retrieval from Sounder Data

  6. GOES-12 SO2 retrieval using the ozone channel as reference

  7. Montserrat TOMS GOES HYSPLIT AIRS JULY 13, 2002

  8. It appears that the GOES sounder is capable of detecting Upper Troposphere Lower Stratosphere SO2. Unprecedented temporal resolution heralds new possibilities for monitoring SO2 and ash. Changes to the ABI will permit purposeful SO2 detection using the 7.3 µm channel. More work is required to validate the SO2 retrievals and to find the ‘optimum’ reference channels. Conclusions

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