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https://doi.org/10.5194/bg-2020-125
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-125
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  21 Sep 2020

21 Sep 2020

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This preprint is currently under review for the journal BG.

Winter atmospheric nutrients and pollutants deposition on West Sayan mountain lakes (Siberia)

Daniel Diaz-de-Quijano1, Aleksander Vladimirovich Ageev1, Elena Anatolevna Ivanova1, and Olesia Valerevna Anishchenko1,2 Daniel Diaz-de-Quijano et al.
  • 1Siberian Federal University, 79, Svobondyi prospekt, Krasnoyarsk, 660041, Krasnoyarskii Krai, Russian Federation
  • 2Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, 50/50, Akademgorodok, Krasnoyarsk, 660036, Krasnoyarskii Krai, Russian Federation

Abstract. The world map of anthropogenic atmospheric nitrogen deposition and its effects on natural ecosystems is not described with equal precision everywhere. In this paper, we report atmospheric nutrient, sulphate and spheroidal carbonaceous particles (SCPs) deposition rates, based on snowpack analyses, of a formerly unexplored Siberian mountain region. Then, we discuss their potential effects on lake phytoplankton biomass limitation.

We estimate that the nutrient depositions observed in the late season snowpack (40 ± 16 mg NO3-N × m−2 and 0.58 ± 0.13 mg TP-P · m−2) would correspond to yearly depositions lower than 119 ± 71 mg NO3-N · m−2 · y−1 and higher than 1.71 ± 0.91 mg TP-P · m−2 · y−1. These yearly deposition estimates would approximately fit the predictions of global deposition models and correspond to the very low nutrient deposition range although they are still higher than world background values.

In spite of the fact that such low atmospheric nitrogen deposition rate would be enough to induce nitrogen limitation in unproductive mountain lakes, the extremely low phosphorus deposition would have made the bioavailable N : P deposition ratio to be frankly high. In the end, lake phytoplankton appeared to be hanging on the fence between phosphorus and nitrogen limitation, with a trend towards nitrogen limitation. We conclude that slight imbalances in the nutrient deposition might have important effects on the ecology of these lakes under the expected scenario of climate warming, increased winter precipitation, enhanced forest fires and shifts in anthropogenic nitrogen emissions.

Daniel Diaz-de-Quijano et al.

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Short summary
Winter atmospheric nitrogen and phosphorus depositions were measured for the first time in the West Sayan mountains (Siberia). The low and very low atmospheric N and P depositions could be responsible for the observed lake phytoplankton N-P colimitation. We hypothesize that slight imbalances in the nutrient deposition, as expected in the context of global change (climate, forest fire regime, and anthropogenic nitrogen emissions), could have important effects on the ecology of these lakes.
Winter atmospheric nitrogen and phosphorus depositions were measured for the first time in the...
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