Seasonal Variations of Dissolved Iron Concentration in Active Layer and Rivers in Permafrost Areas, Russian Far East

Dissolved iron (dFe) in boreal rivers may play an important role in primary production in high-latitude oceans. However, iron behavior in soils and dFe discharge mechanism from soil to the rivers are poorly understood. To better understand iron dynamics on the watershed scale, we observed the season...

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Bibliographic Details
Published in:Water
Main Authors: Yuto Tashiro, Muneoki Yoh, Takayuki Shiraiwa, Takeo Onishi, Vladimir Shesterkin, Vladimir Kim
Format: Article in Journal/Newspaper
Language:English
Published: MDPI AG 2020
Subjects:
permafrost
wetland
dissolved iron
Amur river
Hydraulic engineering
TC1-978
Water supply for domestic and industrial purposes
TD201-500
Online Access:https://doi.org/10.3390/w12092579
https://doaj.org/article/5f79f722fa574ac68c822c51c29dae8f
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Summary:Dissolved iron (dFe) in boreal rivers may play an important role in primary production in high-latitude oceans. However, iron behavior in soils and dFe discharge mechanism from soil to the rivers are poorly understood. To better understand iron dynamics on the watershed scale, we observed the seasonal changes in dFe and Dissolved Organic Carbon (DOC) concentrations in the river as well as dFe concentration in soil pore waters in permafrost watershed from May to October. During snowmelt season, high dFe production (1.38–4.70 mg L <math display="inline"><semantics><mrow><msup><mrow></mrow><mo>−</mo></msup><mn>1</mn></mrow></semantics></math> ) was observed in surface soil pore waters. Correspondingly, riverine dFe and DOC concentrations increased to 1.10 mg L <math display="inline"><semantics><mrow><msup><mrow></mrow><mo>−</mo></msup><mn>1</mn></mrow></semantics></math> and 32.3 mg L <math display="inline"><semantics><mrow><msup><mrow></mrow><mo>−</mo></msup><mn>1</mn></mrow></semantics></math> , and both were the highest in the year. After spring floods, riverine dFe and DOC concentrations decreased to 0.15 mg L <math display="inline"><semantics><mrow><msup><mrow></mrow><mo>−</mo></msup><mn>1</mn></mrow></semantics></math> and 7.62 mg L <math display="inline"><semantics><mrow><msup><mrow></mrow><mo>−</mo></msup><mn>1</mn></mrow></semantics></math> , and dFe concentration in surface soil pore waters also decreased to 0.20–1.28 mg L <math ...

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