Day 4

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Paper title Estimation of the biogeochemical properties in European lakes based on remote sensing, meteorological factors and catchment characteristics
  1. Kaire Toming Estonian Marine Institute, University of Tartu Speaker
  2. Evelyn Uuemaa Estonian Marine Institute, University of Tartu
  3. Alexnder Kmoch Institute of Ecology and Earth Sciences, University of Tartu
  4. Tuuli Soomets Estonian Marine Institute, University of Tartu
  5. Alo Laas Estonian University of Life Sciences
  6. Martin Ligi University of Tartu
  7. Birgot Paavel Estonian Marine Institute, University of Tartu
  8. Tiina Nõges Chair of Hydrobiology and Fishery, Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences
  9. Tiit Kutser Estonian Marine Institute, University of Tartu
Form of presentation Poster
  • A7. Hydrology and Water Cycle
    • A7.06 EO for monitoring water quality and ecological status in inland waters
Abstract text Lakes play a crucial role in the global biogeochemical cycles through the transport, storage and transformation of different biogeochemical compounds. Furthermore, their regulatory service appears to be disproportionately important relative to their small areal extent. The global temperatures are expected to increase further over the coming decades, and economic development is driving significant land-use changes in many regions. Therefore, the need for improved understanding of the interactions between lake biogeochemical properties and catchment characteristics, as well as innovative approaches and techniques to get required high-quality information for large scale has never been greater. Unfortunately, only a tiny fraction of lakes on Earth are observed regularly and data are typically collected at a single point and provide just a snapshot in time. Using remote sensing together with high-frequency buoy measurements is one of the options to mitigate these spatial and temporal limitations. Until very recently, there have been no suitable satellites to perform lake studies on a global scale. The technical issues that were hampering remote sensing of lakes for a long time have been partly solved by the European Space Agency with the launch of Sentinel-2A in 2015 and Sentinel-2B in 2017 (S2). S2 covers the whole world, has a very good radiometric resolution and allows data acquisition at 10 m and 20 m resolution, which permits assessment of an unprecedented number of lakes globally. Still, remote sensing products of lakes have been rarely validated and often with poor results. The main problem is a lack of in situ data, which are needed for validating and improving remote sensing products. Using the high-frequency buoy measurements might be the solution. It will enable the validation of remote sensing products more accurately as it increases the probability of getting match-up data. Therefore, combining S2 capabilities, high-frequency measurements and conventional sampling data we firstly aim to estimate the biogeochemical properties (coloured dissolved organic matter, chlorophyll a, total suspended matter, primary production, dissolved organic carbon, total phosphorus and total nitrogen) in optically different European lakes to test which of the biogeochemical properties may be successfully estimated from the S2 data. Secondly, combining remote sensing capabilities with the increasing potential of Geographic Information System and land cover maps we aim to study the interactions between lakes biogeochemical properties, meteorological factors and catchment characteristics with high accuracy in large scales. The expected results will improve our understanding of the role of lakes in the global biogeochemical cycles and have a strong applied impact allowing to make reliable recommendations for decision-makers and lake managers for different ecological, water quality, climate and carbon cycle applications, and improving significantly the cost-efficiency of lake monitoring both regionally and globally.