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

Li, Z; Muller, JP; Cross, P; Albert, P; Hewison, T; Watson, R; Fischer, J; (2004) Validation of MERIS near IR water vapour retrievals using MWR and GPS measurements. In: (pp. pp. 13-18).

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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.

Type: Proceedings paper
Title: Validation of MERIS near IR water vapour retrievals using MWR and GPS measurements
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: http://discovery.ucl.ac.uk/id/eprint/189321
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