Effects of Snow and Remineralization Processes on Nutrient Distributions in Multi-Year Antarctic Landfast Sea Ice

We elucidated the effects of snow and remineralization processes on nutrient distributions in multi-year landfast sea ice (fast ice) in Lutzow-Holm Bay, East Antarctica. Based on sea-ice salinity, oxygen isotopic ratios, and thin section analyses, we found that the multi-year fast ice grew upward du...

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Bibliographic Details
Published in:Journal of Geophysical Research: Oceans
Main Authors: Sahashi, Reishi, Nomura, Daiki, Toyota, Takenobu, Tozawa, Manami, Ito, Masato, Wongpan, Pat, Ono, Kazuya, Simizu, Daisuke, Naoki, Kazuhiro, Nosaka, Yuichi, Tamura, Takeshi, Aoki, Shigeru, Ushio, Shuki
Format: Article in Journal/Newspaper
Language:English
Published: American Geophysical Union
Subjects:
sea ice
snow
nutrients
remineralization
multi-year landfast ice
fast ice
East Antarctica
452
Antarctic
Antarc*
Antarctica
Sea ice
Online Access:http://hdl.handle.net/2115/87739
https://doi.org/10.1029/2021JC018371
Description
Summary:We elucidated the effects of snow and remineralization processes on nutrient distributions in multi-year landfast sea ice (fast ice) in Lutzow-Holm Bay, East Antarctica. Based on sea-ice salinity, oxygen isotopic ratios, and thin section analyses, we found that the multi-year fast ice grew upward due to the year-by-year accumulation of snow. Compared to ice of seawater origin, nutrient concentrations in shallow fast ice were low due to replacement by clean and fresh snow. In deeper ice of seawater origin (the lower half of the multi-year fast ice column), remineralization was dominated by the degradation of organic matter. By comparison between first- and muti-year ice, the biological uptake and the remineralization were dominated in relatively young ice and older ice, respectively, under the physical process of brine drainage.

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