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Proceedings Paper

NASA HIRDLS and ESA MIPAS data product comparison (and other ground data)
Author(s): Christopher Hepplewhite; John Barnett; Anu Dudhia; John Gille; Alison Waterfall
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Paper Abstract

The HIRDLS instrument is a limb viewing infra-red radiometer on the NASA Aura spacecraft in a sun synchronous low earth orbit and obtains measurements of the composition of the atmosphere covering the whole Earth each day. The MIPAS instrument is a limb viewing infra-red interferometer on board the European Envisat satellite in a very similar orbit to Aura except that the local solar time is different. The complement of geophysical data products of both instruments is very similar, and because of similar observation strategies their two data sets can be usefully compared. The comparison provides the means to support validation in order to obtain statistics such as systematic differences and variance. This is performed over the full latitude range of HIRDLS and height range of MIPAS and thereby helps to identify sources of errors. The identification of known atmospheric features is a useful diagnostic, and includes such things as regions of upwelling of tracer gases, or the propagation of coherent structures as with mid-latitude waves and we can test whether these structures are consistently represented in both data sets. HIRDLS version 2.04.19 (v004) temperature, ozone and nitric acid show very low systematic 'errors' compared to MIPAS over most of the spatial range. Currently pre-released water vapour, nitrous oxide and F-11 are reasonably similar, CH4 somewhat more restricted, and nitrogen dioxide, N2O5, chlorine nitrate and F-12 as yet susceptible to complications from the obstructed telescope. Further details are discussed in the paper.

Paper Details

Date Published: 3 September 2008
PDF: 13 pages
Proc. SPIE 7082, Infrared Spaceborne Remote Sensing and Instrumentation XVI, 708219 (3 September 2008); doi: 10.1117/12.800712
Show Author Affiliations
Christopher Hepplewhite, Univ. of Oxford (United Kingdom)
John Barnett, Univ. of Oxford (United Kingdom)
Anu Dudhia, Univ. of Oxford (United Kingdom)
John Gille, National Ctr. for Atmospheric Research (United States)
Alison Waterfall, Rutherford Appleton Lab. (United Kingdom)

Published in SPIE Proceedings Vol. 7082:
Infrared Spaceborne Remote Sensing and Instrumentation XVI
Marija Strojnik, Editor(s)

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