EGU2020-12485
https://doi.org/10.5194/egusphere-egu2020-12485
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

The outgassing of carbon dioxide from aquatic ecosystems of Western Siberia (ZOTTO area) and implications for the regional carbon budget

Prokushkin Anatoly1,2, Panov Alexey1, Polosukhina Daria2, Urban Anastasia1, and Karlsson Jan3
Prokushkin Anatoly et al.
  • 1V.N. Sukachev Institute of Forest SB RAS, Krasnoyarsk, Russia (prokushkin@ksc.krasn.ru)
  • 2Siberian Federal Unversity, Krasnoyarsk, Russia (dana_polo@mail.ru)
  • 3Climate Impacts Research Centre (CIRC), Department of Ecology and Environmental Science, Umeå University, Sweden (jan.p.karlsson@umu.se)

The lateral migration of dissolved carbon dioxide (CO2) with soil solutions to fresh water aquatic systems and in situ mineralization of soil-derived organic carbon (OC) often causes supersaturation of the inland waters with CO2. An evasion of excess CO2 from lake and stream surfaces to the atmosphere is important, but underestimated, pathway of carbon flux in the coupled terrestrial-aquatic carbon cycle. As a result, the loss of terrestrial OC as CO2 through the drainage networks remains poorly accounted in regional carbon budgets estimated on the basis of eddy covariance measurements. In this study we have made an attempt to quantify fluxes of dissolved CO2 (pCO2) and CO2 emissions (fCO2) in fluvial and lacustrine waterbodies located within the peat-bog dominated landscape of Western Siberia (ZOTTO area, 60oN, 89oE). For two consecutive years (2018-2019) we studied the seasonal and diurnal dynamics of pCO2 and fCO2 in several different order streams (1-4) and ponds within a peatbog. Dissolved pCO2 was measured by portable IRGA Vaisala GMP222 placed in PTFE membrane. Carbon dioxide emissions were analyzed using floating chamber equipped with same portable IRGA (Vaisala GMP222). Despite, the pCO2 values were highest in winter season (350-820 umol/l) we did not detect sizeable emissions from water surface in that period. The peaks of pCO2 in summer-fall season (up to 360 umol/l) occurred at stormflow regimes. The frost-free season emission of CO2 from stream surfaces ranged from 0.2 to 7.5 umol/m2/s and decreased with the order of stream. An averaged for the season CO2 evasion from the Razvilki stream (2nd order stream) was 4.9±1.3 umol/m2/s, which is comparable to the seasonal mean of soil CO2 emissions in the study area. However, in opposite to soil respiration, which maxima often corresponds to highest soil temperatures, peaks of CO2 outgassing occur at high flow regimes. The fCO2 values were correlated with discharge (r = 0.60, p<0.05) and DOC concentrations (r = 0.69, p<0.05). Aquatic C losses are still under analysis in terms of surface water area estimation.

How to cite: Anatoly, P., Alexey, P., Daria, P., Anastasia, U., and Jan, K.: The outgassing of carbon dioxide from aquatic ecosystems of Western Siberia (ZOTTO area) and implications for the regional carbon budget, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-12485, https://doi.org/10.5194/egusphere-egu2020-12485, 2020

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