Research Papers

Accuracy of atmospheric trends inferred from the Halogen Occultation Experiment data

[+] Author Affiliations
Larry Gordley, Earl Thompson, Martin McHugh

GATS, Inc., 11864 Canon Blvd., Suite 101, Newport News, VA 23606

Ellis Remsberg

NASA Langley Research Center, 21 Langley Blvd., Hampton, VA 23681-2199

James Russell III

Hampton University, 23 Tyler Street, Hampton, VA 23668

Brian Magill

SSAI, 1 Enterprise Parkway, Suite 200, Hampton, VA 23666

J. Appl. Remote Sens. 3(1), 033526 (April 20, 2009). doi:10.1117/1.3131722
History: Received November 21, 2008; Revised April 3, 2009; Accepted April 15, 2009; April 20, 2009; Online April 20, 2009
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Abstract

The Halogen Occultation Experiment (HALOE) operated in orbit for over 14 years, providing high quality measurements from the upper troposphere into the lower thermosphere. Since the quality of this data set depended on the long-term stability of the instrument, a series of analysis tests were designed to routinely monitor instrument performance. These tests evaluated possible changes in the gas cells, electronic gains, optical performance, and signal temperature dependencies. The gas cell stability was determined from an analysis of the Doppler shift signature in retrieved mixing ratios. Electronic gain stability was determined by instrument scans of the solar disk, each with different balance settings. Optical and tracking performance was also determined from solar scan data. The only statistically significant changes detected were: 1. a small methane gas cell change, causing less than 0.5% per decade change in retrieved methane, and 2. a small optical alignment change in the HF channel that only affects HF results below 25 kilometers. These detailed analyses indicate that the HALOE instrument remained stable throughout the mission, adding confidence to the long-term atmospheric trends deduced from HALOE products.

© 2009 Society of Photo-Optical Instrumentation Engineers

Citation

Larry Gordley ; Earl Thompson ; Martin McHugh ; Ellis Remsberg ; James Russell III, et al.
"Accuracy of atmospheric trends inferred from the Halogen Occultation Experiment data", J. Appl. Remote Sens. 3(1), 033526 (April 20, 2009). ; http://dx.doi.org/10.1117/1.3131722


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