Fourth Study Conference on BALTEX Scala Cinema Gudhjem

shows a ground-track of the vessel representing one GPS
experiment. More than 100 experiments of this kind were
successfully carried out in 2002.
These experiments are certainly of added value since only
few data are available on the open sea and, as a
consequence, this technique can close gaps with respect to
integrated water vapour samples.
4. Results
Results collected in static networks underline the good
performance of the regional climate model REMO. Monthly
mean values usually reveal prediction errors of less than 1
kg/m² with maximum discrepancies in the range of 2 kg/m²
and a mean standard deviation of better than 0.5 kg/m².
Kinematic GPS results processed for data colleted on
research vessel Alkor will be presented as one example and
show a good agreement with the radiosonde results as well
as with results from numerical weather models. The shortterm
agreement with the REMO climate model is in the
range of 3.5 kg/m² for this example which only represents a
snapshot, of course. It is expected that more results on
kinematic GPS water vapour estimation will be ready for
presentation right at the conference.
References
Schueler, T., On Ground-Based GPS Tropospheric Delay
Estimation, Dissertation, Schriftenreihe, Studiengang
Geodäsie und Geoinformation, University FAF Munich,
Neubiberg, Vol. 73, No., 360 pages, 2001
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