Major anion and cation fluxes from the Central SiberianPlateau watersheds with underlying permafrost

International Conference and Early Career Scientists School on Environmental Observations, Modelling and Information Systems

生态环境科学;计算机科学

Kolosov, Roman R.^1 ; Prokushkin, Anatoly S.^1 ; Pokrovsky, Oleg S.^2

V N Sukachev Institute of Forest, SB RAS, Akademgorodok 50/28, Krasnoyarsk

660036, Russia^1

Tomsk State University, 36 Lenin Ave., Tomsk

634050, Russia^2

关键词: Active Layer;    Global climate warming;    Major anions;    Permafrost degradation;    Permafrost distribution;    Total exports;    Volume-weighted means;    Water discharges;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/48/1/012018/pdf
DOI  :  10.1088/1755-1315/48/1/012018

来源: IOP

【 摘 要 】

The subarctic rivers of the Central Siberian Plateau have specific fed-characteristics due to the permafrost distribution and the active layer thawing dynamics. Two watersheds with different types of permafrost (from insular to continuous) are studied. Different data sources (Roshydromet and our own observations) are used for receiving anions' (HCO3-, SO42-, Cl-) and cations' (Ca2+, Mg2+) fluxes from the Nizhnyaya Tunguska river (1960-2011) and the Tembenchi river (1970-2011). The annual discharge of N. Tunguska for 1939-2011 is characterized by an increase of 0.3 km3/year/year, and for Tembenchi, 0.04 km3/year/year. The major part of the increase (about 60%) is due to spring flooding (May - June). The volume-weighted mean concentrations of major anions and cations in the N. Tunguska river water increased three times in the spring period (40.7 - 116.8 mg/l) and in the summer-fall period (74-212.9 mg/l). On the contrary, such concentrations decreased sharply during the winter mean water period. Due to these results, the total export of main anions and cations from the N. Tunguska river basin rose more than 4,5 times. Two possible reasons can be identified: 1) a water discharge increase of the Subarctic rivers (Peterson et al., 2002); 2) permafrost degradation induced by global climate warming (Frey and McClelland 2009).