Validation of MERIS near IR water vapour retrievals using MWR and GPS measurements

Zhenhong Li, Jan Peter Muller, Paul Cross, Peter Albert, Tim Hewison, Robert Watson, Jürgen Fischer, Ralf Bennartz

Research output: Contribution to journalConference article

Abstract

In this paper, the reduced resolution (RR) MEdium Resolution Imaging Spectrometer (MERIS) near infrared (IR) water vapour (PWV) products above land surfaces produced at the Freie Universität Berlin (FUB) are examined through inter-comparisons with contemporaneous microwave radiometer (MWR) and GPS data sets. The intercomparison of MWR and MERIS water vapour retrievals showed a good correlation of 0.99 with a standard deviation of 1.0 mm, and an overall slight wet bias of MERIS near IR water vapour was observed. Unfortunately, this inter-comparison was limited by the number of samples. Moreover, a spatio-temporal comparison between MERIS and GPS water vapour products was performed using data covering all of Germany for one year from October 2002 to September 2003. MERIS water vapour values appeared to be slightly greater than GPS values under either very dry (PWV<5 mm) or very wet (PWV>25 mm) conditions. However, MERIS water vapour agreed well with GPS water vapour retrievals under moderate conditions with a standard deviation of 1.3 mm and a mean difference of -0.4 mm.

Original languageEnglish
Pages (from-to)13-18
Number of pages6
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number549
Publication statusPublished - 2004
EventMERIS User Workshop - Frascati, Italy
Duration: 10 Nov 200313 Nov 2003

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science

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