Projekti eesmärk on ruumiandmete modelleerimisega hinnata Baltikumi piirkonna sademete isotoopkoostist ja teha kindlaks selle päritolu, tuginedes Balti Arteesiabasseini (BAB) põhjavee isotoop- ja keemilise koostise andmetele.
The project focuses on geospatial modelling to estimate the isotopic composition of Baltic states precipitation and determine its origin based on isotopic and chemical composition of Baltic Artesian Basin (BAB) groundwater. There is no data on long-term trend lines of precipitations’ isotopic composition in BAB. Numerous studies have shown that precipitation's δD and δ18O are reflected in surficial waters. BAB’s shallow phreatic groundwater could be used as an isotopic integrator of long-term seasonally weighted precipitation inputs to the landscape to aid in calibrating spatial H and O isotopes. A set of isotope data for BAB’s shallow groundwater wells and springs would develop a spatially continuous database for the whole region. Using geostatistical models, this could help estimate the origin of precipitation and verify the existing groundwater flow models. Sampling sites comprise shallow groundwater wells located all over Baltic states. In order to measure δD/δ18O and determine the water's chemical composition, over 100 objects (wells or springs) have incorporated into the database. Obtained data analyzed using geospatial modelling based on Surfer and ArcGIS to derive the stable isotope composition map of subsurface groundwaters to estimate precipitation’s isotope composition which falling on landscapes.