3 September 2008 NASA HIRDLS and ESA MIPAS data product comparison (and other ground data)
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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.
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Christopher Hepplewhite, Christopher Hepplewhite, John Barnett, John Barnett, Anu Dudhia, Anu Dudhia, John Gille, John Gille, Alison Waterfall, Alison Waterfall, } "NASA HIRDLS and ESA MIPAS data product comparison (and other ground data)", Proc. SPIE 7082, Infrared Spaceborne Remote Sensing and Instrumentation XVI, 708219 (3 September 2008); doi: 10.1117/12.800712; https://doi.org/10.1117/12.800712
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