Lake Onego development in the Late Glacial assessed with the use of GIS technologies

The GIS‑based reconstructions of Lake Onego development in the Late Glacial (14500–12300 yrs ago) were performed. Reconstructions  have been based on the deglaciation model of the Lake Onego depression, digital elevation model of the lake depression, SRTM model of its drainage basin and on the data obtained from the palaeolimnological studies of numerous lake sediment cores. This allowed us to distinguish six main stages of the lake development for which a series of detailed schemes were produced. 1. Formation of the ice‑dammed lake as a result of the ice sheet retreating (14.5 cal ka BP).  2. Emerging  of the southern and central parts of the lake basin from the ice cover (14.0 cal ka BP). 3. The maximum development of the proglacial lake (13.3 cal ka BP). The lake area in this period was around 33 000 km². 4. The first regression (13.2 ka BP). 5. The second regression (12.4 ka BP). 6. The third regression (12.3 ka BP), when the area of the lake dropped to 18 000 km². We created detailed  digital  maps of the main stages of Lake Onego development during the Late Glacial  and calculated the spatial parameters of the lake. The quantitative data obtained in this study would be used in estimation  of the volumes of the lake and outflow discharges in the past. Maps are available in electronic  form.

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