1. Effects of snow and remineralization processes on nutrient distributions in multi-year Antarctic landfast sea ice
- Author
-
Reishi Sahashi, Daiki Nomura, Takenobu Toyota, Manami Tozawa, Masato Ito, Pat Wongpan, Kazuya Ono, Daisuke Simizu, Kazuhiro Naoki, Yuichi Nosaka, Takeshi Tamura, Shigeru Aoki, and Shuki Ushio
- Subjects
Geophysics ,remineralization ,multi-year landfast ice ,Space and Planetary Science ,Geochemistry and Petrology ,nutrients ,fast ice ,Earth and Planetary Sciences (miscellaneous) ,East Antarctica ,snow ,Oceanography ,sea ice - Abstract
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.
- Published
- 2021