Lookup NU author(s): Professor Philip Moore,
Professor Stuart Edwards
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Application of altimetric measurements to sea level change requires that all measurements and associated geophysical corrections are investigated for spurious characteristics that otherwise will aliase the sea level results. In particular, the accuracy and stability of the brightness temperatures are measured by the passive microwave radiometer onboard ENVISAT is crucial to form the wet tropospheric delay for the alimetric range. In this study we compare the precipitable water vapour (PWV) from the ENVISAT microwave radiometer (MWR) against GPS derived wet tropospheric path delays utilising a coastal subset of the global network of IGS stations operationsal for 2002 through to the present day. By reference to the coldest brightness temperatures, drift in the 36.5GHz channel is identified. In additon, we undertake comparisons of the ENVISAT MWR against PWV recovered from the Advanced Microwave Scanning Radiometer - EOS (AMSW-E) oboard Aqua, launched in May 2002. AMSR-E is a six frequency total passive microwave radiometer system measuring brightness temperatures at 6.925, 18.7, 23.8, 36.5 and 89.0 GHz. Given the commonality of frequency at 23.8GHz and 36.5GHz brightness temperatures from AMSR-E and ENVISAT can be inter-compared.
Author(s): Moore P, Edwards SJ
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: Envisat Symposium 2007
Year of Conference: 2007
Publisher: European Space Agency