The Baltic Sea Experiment (BALTEX) is one of the five continental-scale experiments of the Global Energy and Water Cycle Experiment (GEWEX). More than 50 research groups from 14 European countries are participating in this project to measure and model the energy and water cycle over the large drainage basin of the Baltic Sea in northern Europe. BALTEX aims to provide a better understanding of the processes of the climate system and to improve and to validate the water cycle in regional numerical models for weather forecasting and climate studies. A major effort is undertaken to couple interactively the atmosphere with the vegetated continental surfaces and the Baltic Sea including its sea ice. The intensive observational and modeling phase BRIDGE, which is a contribution to the Coordinated Enhanced Observing Period of GEWEX, will provide enhanced datasets for the period October 1999–February 2002 to validate numerical models and satellite products. Major achievements have been obtained in an improved understanding of related exchange processes. For the first time an interactive atmosphere–ocean–land surface model for the Baltic Sea was tested. This paper reports on major activities and some results.
aGKSS Research Center, Geesthacht, Germany.
bMax-Planck Institut für Meteorologie, Hamburg, Germany.
cSwedish Meteorological and Hydrological Institute, Norrköping, Sweden.
dDeutscher Wetterdienst, Lindenberg, Germany.
eRoyal Netherlands Meteorological Institute, De Bilt, Netherlands.
fUniversität Kiel, Kiel, Germany.
gFinnish Meteorological Institute, Helsinki, Finland.
hRisø National Laboratory, Roskilde, Denmark.
iUppsala University, Uppsala, Sweden.
jLatvia University of Agriculture, Jelgava, Latvia.
kEstonian Business School, Tallinn, Estonia.
lInstitut für Osteeforschung Warnemünde, Warnemünde, Germany.
mFinnish Institute of Marine Research, Helsinki, Finland.
nUniversity of Gothenburg, Gothenburg, Sweden.
oInstitute of Geophysics, Warsaw, Poland.
pInstitute of Oceanology, Polish Academy of Sciences, Sopot, Poland.
qVeterinärmedizinische Universitüät Wien, Vienna, Austria.
rInstitutionen för Geovetenskaper, Meteorlogi, Uppsala, Sweden.