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Title:
Analysis of Observed Biases in MOPITT Radiances
Authors:
Deeter, M.; Gille, J.; Edwards, D.; Emmons, L.
Affiliation:
AA(National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307 United States ; ), AB(National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307 United States ; ), AC(National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307 United States ; ), AD(National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307 United States ; )
Publication:
American Geophysical Union, Fall Meeting 2006, abstract #A31B-0886
Publication Date:
12/2006
Origin:
AGU
AGU Keywords:
0345 Pollution: urban and regional (0305, 0478, 4251), 0365 Troposphere: composition and chemistry, 0394 Instruments and techniques, 1640 Remote sensing (1855)
Abstract Copyright:
(c) 2006: American Geophysical Union
Bibliographic Code:
2006AGUFM.A31B0886D

Abstract

Because of significant biases observed in some of the Measurements of Pollution In The Troposphere (MOPITT) thermal-channel radiances, only a subset of the available radiances are used to retrieve the CO profile in the original MOPITT product (Version 3). In the next operational product (Version 4), some form of radiance bias correction will be implemented. This feature will allow use of more available thermal-channel radiances and may thereby increase the retrieval information content. Properly correcting for the biases in the MOPITT radiances requires an analysis in which “true” biases are distinguished from “apparent” biases associated with the radiance validation method. For example, the validation method necessarily assumes that in-situ carbon monoxide profiles measured from aircraft exactly describe the CO distribution over a substantial three-dimensional region surrounding the validation site. Departures of the actual CO distribution from this ideal lead to apparent radiance biases. Apparent biases may also be associated with the limited vertical extent of the in-situ profiles (which requires the application of an ad-hoc extrapolation method). Methods for minimizing the influence of apparent biases will be described, leading to estimated values for the true radiance biases.
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