Journal article

IASI temperature and water vapor retrievals - error assessment and validation

Pougatchev N, August T, Calbet X, Hultberg T, Oduleye O, Schluessel P, Stiller B, St Germain K, Bingham G ...see all

ATMOSPHERIC CHEMISTRY AND PHYSICS, vol. 9, issue 17 (2009) pp. 6453-6458

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Abstract

The METOP-A satellite Infrared Atmospheric Sounding Interferometer
(IASI) Level 2 products comprise retrievals of vertical profiles of
temperature and water vapor. The error covariance matrices and biases of
the most recent version (4.3.1) of the L2 data were assessed, and the
assessment was validated using radiosonde data for reference. The
radiosonde data set includes dedicated and synoptic time launches at the
Lindenberg station in Germany. For optimal validation, the linear
statistical Validation Assessment Model (VAM) was used. The VAM uses
radiosonde profiles as input and provides optimal estimate of the
nominal IASI retrieval by utilizing IASI averaging kernels and
statistical characteristics of the ensembles of the reference
radiosondes. For temperatures above 900 mb and water retrievals above
700 mb, level expected and assessed errors are in good agreement. Below
those levels, noticeable excess in assessed error is observed, possibly
due to inaccurate surface parameters and undetected clouds/haze.

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  • SCOPUS: 2-s2.0-71149117388
  • PUI: 358185658
  • ISSN: 1680-7316
  • SGR: 71149117388

Authors

  • N Pougatchev

  • T August

  • X Calbet

  • T Hultberg

  • O Oduleye

  • P Schluessel

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