Biogeochemical characteristics of brash sea ice and icebergs during summer and autumn in the Indian sector of the Southern Ocean

被引：5

作者：

Nomura, Daiki ^{[1
,2
,3
]}

Sahashi, Reishi ^{[3
]}

Takahashi, Keigo D. ^{[4
]}

Makabe, Ryosuke ^{[4
,5
,6
]}

Ito, Masato ^{[5
]}

Tozawa, Manami ^{[3
]}

Wongpan, Pat ^{[7
]}

Matsuda, Ryo ^{[8
]}

Sano, Masayoshi ^{[9
]}

Yamamoto-Kawai, Michiyo ^{[6
]}

Nojiro, Natsumi ^{[6
]}

Tachibana, Aiko ^{[6
]}

Kurosawa, Norio

Moteki, Masato ^{[5
,6
]}

Tamura, Takeshi ^{[4
,5
]}

Aoki, Shigeru ^{[10
]}

Murase, Hiroto ^{[6
]}

机构：

[1] Hokkaido Univ, Field Sci Ctr Northern Biosphere, 3-1-1 Minato Cho, Hakodate, Hokkaido 0418611, Japan

[2] Hokkaido Univ, Arctic Res Ctr, N21 W11,Kita Ku, Sapporo, Hokkaido 0010021, Japan

[3] Hokkaido Univ, Fac Grad Sch Fisheries Sci, 3-1-1 Minato Cho, Hakodate, Hokkaido 0418611, Japan

[4] SOKENDAI, Grad Univ Adv Studies, 10-3 Midori Cho, Tachikawa, Tokyo 1908518, Japan

[5] Natl Inst Polar Res, 10-3 Midori Cho, Tachikawa, Tokyo 1908518, Japan

[6] Tokyo Univ Marine Sci & Technol, 4-5-7 Konan,Minato Ku, Tokyo 1088477, Japan

[7] Univ Tasmania, Inst Marine & Antarctic Studies, Australian Antarctic Program Partnership, Nipaluna Hobart, Tas, Australia

[8] Soka Univ, Grad Sch Sci & Engn, 1-236 Tangi Machi, Hachioji, Tokyo 1928577, Japan

[9] Univ Tokyo, Atmosphere & Ocean Res Inst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2770882, Japan

[10] Hokkaido Univ, Inst Low Temp Sci, N19 W8,Kita Ku, Sapporo, Hokkaido 0600819, Japan

来源：

PROGRESS IN OCEANOGRAPHY | 2023年 / 214卷

基金：

日本学术振兴会;

关键词：

STABLE-ISOTOPES; CHLOROPHYLL-A; NUTRIENT; WINTER; WATER; IRON; COMPONENTS; DIATOMS; OXYGEN;

D O I：

10.1016/j.pocean.2023.103023

中图分类号：

P7 [海洋学];

学科分类号：

0707 ;

摘要：

We analyzed biogeochemical components of brash ice, originating from sea ice and icebergs, collected in the Indian sector of the Southern Ocean during the summer and autumn of 2018-2020. Ice samples, collected from seawater by net or cage methods, were melted in the dark under cool conditions to measure physical and biogeochemical components such as salinity, stable oxygen isotopes, nutrients, and chlorophyll-a. We compared brash ice parameters with those of seawater samples from the temperature minimum layer, corresponding to the water in which the sea ice originated, to examine the effects of processes such as brine drainage, snow-ice formation, and biological activities on the biogeochemical components in sea ice. Samples from icebergs (ice formed on land) had salinity of zero and low con-centrations of all other components, suggesting that the atmospheric deposition of nutrients is minimal in this clean environment. However, sea ice samples had a wide range of values for each parameter. Our results show that meteoric water makes a smaller contribution to sea ice than it typically does to multi-year landfast ice, and there is no correlation between this meteoric water contribution and nutrient concentrations, which suggests that the contribution of snow-ice formation to nutrients within sea ice is subordinate to the role of biological processes. Nutrient and chlorophyll-a concentrations in our brash ice samples are of similar magnitude to those in sea ice samples collected in the same area by coring of thick pack ice. Our data represent end-member values that may be useful to estimate the respective contributions of snow, sea ice, and seawater to surface water samples.

引用

页数：11

共 44 条

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