Citizen science shows systematic changes in the temperature difference between air and inland waters with global warming

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Dangosydd eitem ddigidol (DOI)

  • Uppsala University
    Uppsala University
  • Murray Mackay
    Environment and Climate Change Canada
  • Jason D. Stockwell
    University of Vermont
  • Wim Thiery
    ETH Zürich
  • Hans-Peter Grossart
    Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Stechlin, Germany
  • Petala B. Augusto-Silva
    National Institute for Space Research (INPE), Sao Paulo
  • Helen M. Baulch
    University of Saskatchewan
  • Elvira de Eyto
    Marine Institute, Furnce
  • Josef Hejzlar
    Institute of Hydrobiology, Czech Republic
  • Kuelli Kangur
    Estonian University of Life Sciences
  • Georgiy Kirillin
    Leibniz-Institute of Freshwater Ecology and Inland Fisheries (IGB)
  • Uppsala University
    Uppsala University
  • James A. Rusak
    Ontario Ministry of the Environment and Climate Change
  • University of Davis
    University of California, Davis
  • University Reading
    University of Reading
Citizen science projects have a long history in ecological studies. The research usefulness of such projects is dependent on applying simple and standardized methods. Here, we conducted a citizen science project that involved more than 3500 Swedish high school students to examine the temperature difference between surface water and the overlying air (Tw-Ta) as a proxy for sensible heat flux (QH). If QH is directed upward, corresponding to positive Tw-Ta, it can enhance CO2 and CH4 emissions from inland waters, thereby contributing to increased greenhouse gas concentrations in the atmosphere. The students found mostly negative Tw-Ta across small ponds, lakes, streams/rivers and the sea shore (i.e. downward QH), with Tw-Ta becoming increasingly negative with increasing Ta. Further examination of Tw-Ta using high-frequency temperature data from inland waters across the globe confirmed that Tw-Ta is linearly related to Ta. Using the longest available high-frequency temperature time series from Lake Erken, Sweden, we found a rapid increase in the occasions of negative Tw-Ta with increasing annual mean Ta since 1989. From these results, we can expect that ongoing and projected global warming will result in increasingly negative Tw-Ta, thereby reducing CO2 and CH4 transfer velocities from inland waters into the atmosphere.
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CyfnodolynScientific Reports
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Dynodwyr Gwrthrych Digidol (DOIs)
StatwsCyhoeddwyd - 6 Maw 2017
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