Impact of Pinatubo aerosol extinction on the Halogen Occultation Experiment (HALOE) infrared occultation measurements

Larry L. Gordley; R. Earl Thompson; Guy M. Beaver; James M. Russell III; Lance E. Deaver; Mark E. Hervig

doi:10.1117/12.187596

30 September 1994 Impact of Pinatubo aerosol extinction on the Halogen Occultation Experiment (HALOE) infrared occultation measurements

Larry L. Gordley, R. Earl Thompson, Guy M. Beaver, James M. Russell III, Lance E. Deaver, Mark E. Hervig

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Proceedings Volume 2266, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research; (1994) https://doi.org/10.1117/12.187596
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

The use of limb radiation measurements to infer atmospheric parameters continues to be a popular technique. The HALOE (Halogen Occultation Experiment) instrument is a gas correlation radiometer on board the UARS (Upper Atmosphere Research Satellite) that performs solar occultation measurements for inferring vertical profiles of HF, HCl, CH₄, NO, O₃, H₂O, NO₂, aerosol extinction and temperature. The first four gases and aerosol are inferred from gas correlation measurements. The remainder are inferred from broadband (> 20 cm^-1) radiometer measurements. The eruption of Mt. Pinatubo before the UARS launch presented a number of challenges for HALOE data processing. Although ideally the gas correlation technique is insensitive to aerosol, in practice the aerosol signature induces optical effects that must be accurately addressed. The inference of extinction profiles for modeling aerosol signature in the radiometer channels was found to require high vertical resolution. The impact due to vertical resolution and other optical effects on the retrieved results is discussed. Simulations and HALOE results are presented to demonstrate and validate the effects. It is found that the Pinatubo layering demands a vertical resolution on the order of 2 km or less to accurately model aerosol effects on broadband limb viewing radiometers.

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Larry L. Gordley, R. Earl Thompson, Guy M. Beaver, James M. Russell III, Lance E. Deaver, and Mark E. Hervig "Impact of Pinatubo aerosol extinction on the Halogen Occultation Experiment (HALOE) infrared occultation measurements", Proc. SPIE 2266, Optical Spectroscopic Techniques and Instrumentation for Atmospheric and Space Research, (30 September 1994); https://doi.org/10.1117/12.187596

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KEYWORDS

Aerosols

Atmospheric modeling

Radiometry

Signal attenuation

Halogens

Infrared radiation

Radio optics

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