Drivers of winter ice formation on Arctic water bodies in the Lena Delta, Siberia

Lütjen, Martha; Overduin, Pier Paul; Juhls, Bennet; Boike, Julia; Morgenstern, Anne; Meyer, Hanno

doi:10.1080/15230430.2024.2350546

Arctic, Antarctic, and Alpine Research

2024

DOI: 10.1080/15230430.2024.2350546

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Drivers of winter ice formation on Arctic water bodies in the Lena Delta, Siberia

Martha Lütjen,

Pier Paul Overduin,

Bennet Juhls

et al.

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Frazil ice changes winter biogeochemical processes in the Lena River

Opfergelt,

Gaspard,

Hirst

et al. 2024

Commun Earth Environ

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The ice-covered period of large Arctic rivers is shortening. To what extent will this affect biogeochemical processing of nutrients? Here we reveal, with silicon isotopes (δ 30 Si), a key winter pathway for nutrients under river ice. During colder winter phases in the Lena River catchment, conditions are met for frazil ice accumulation, which creates microzones. These are conducive to a lengthened reaction time for biogeochemical processes under ice. The heavier δ 30 Si values (3.5 ± 0.5 ‰) in river water reflect that 39 ± 11% of the Lena River discharge went through these microzones. Freezing-driven amorphous silica precipitation concomitant to increased ammonium concentration and changes in dissolved organic carbon aromaticity in Lena River water support microbially mediated processing of nutrients in the microzones. Upon warming, suppressing loci for winter intra-river nitrogen processing is likely to modify the balance between N 2 O production and consumption, a greenhouse gas with a large global warming potential.

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Frazil ice changes winter biogeochemical processes in the Lena River

Opfergelt,

Gaspard,

Hirst

et al. 2024

Commun Earth Environ

View full text Add to dashboard Cite

show abstract

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Drivers of winter ice formation on Arctic water bodies in the Lena Delta, Siberia

Cited by 1 publication

References 74 publications

Frazil ice changes winter biogeochemical processes in the Lena River

Frazil ice changes winter biogeochemical processes in the Lena River

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