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  1. Article: Effects of Snow and Remineralization Processes on Nutrient Distributions in Multi‐Year Antarctic Landfast Sea Ice

    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

    Journal of geophysical research. 2022 July, v. 127, no. 7

    2022  

    Abstract: We elucidated the effects of snow and remineralization processes on nutrient distributions in multi‐year landfast sea ice (fast ice) in Lützow‐Holm Bay, East Antarctica. Based on sea‐ice salinity, oxygen isotopic ratios, and thin section analyses, we ... ...

    Abstract We elucidated the effects of snow and remineralization processes on nutrient distributions in multi‐year landfast sea ice (fast ice) in Lützow‐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.
    Keywords drainage ; geophysics ; organic matter ; oxygen ; research ; salinity ; sea ice ; seawater ; snow ; Antarctic region ; Antarctica
    Language English
    Dates of publication 2022-07
    Publishing place John Wiley & Sons, Ltd
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 161667-5
    ISSN 2169-9291 ; 2169-9275 ; 0148-0227 ; 0196-2256
    ISSN (online) 2169-9291
    ISSN 2169-9275 ; 0148-0227 ; 0196-2256
    DOI 10.1029/2021JC018371
    Database NAL-Catalogue (AGRICOLA)

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  2. Article ; Online: Biogeochemical characteristics of brash sea ice and icebergs during summer and autumn in the Indian sector of the Southern Ocean

    Nomura, Daiki / Sahashi, Reishi / Takahashi, Keigo D. / Makabe, Ryosuke / Ito, Masato / Tozawa, Manami / Wongpan, Pat / Matsuda, Ryo / Sano, Masayoshi / Yamamoto-Kawai, Michiyo / Nojiro, Natsumi / Tachibana, Aiko / Kurosawa, Norio / Moteki, Masato / Tamura, Takeshi / Aoki, Shigeru / Murase, Hiroto

    Progress in Oceanography. 2023 Apr. 14, p.103023-

    2023  , Page(s) 103023–

    Abstract: 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 ... ...

    Abstract 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 concentrations 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.
    Keywords atmospheric deposition ; autumn ; cages ; chlorophyll ; drainage ; oceanography ; oxygen ; salinity ; sea ice ; seawater ; snow ; summer ; surface water ; temperature ; icebergs ; nutrients ; melting ; Southern Ocean
    Language English
    Dates of publication 2023-0414
    Publishing place Elsevier Ltd
    Document type Article ; Online
    Note Pre-press version
    ISSN 0079-6611
    DOI 10.1016/j.pocean.2023.103023
    Database NAL-Catalogue (AGRICOLA)

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    Order via subito

    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  3. Article ; Online: Biogeochemical characteristics of brash sea ice and icebergs during summer and autumn in the Indian sector of the Southern Ocean

    Nomura, Daiki / Sahashi, Reishi / Takahashi, Keigo D. / Makabe, Ryosuke / Ito, Masato / Tozawa, Manami / Wongpan, Pat / Matsuda, Ryo / Sano, Masayoshi / Yamamoto-Kawai, Michiyo / Nojiro, Natsumi / Tachibana, Aiko / Kurosawa, Norio / Moteki, Masato / Tamura, Takeshi / Aoki, Shigeru / Murase, Hiroto

    2023  

    Abstract: 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 ... ...

    Abstract 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 concentrations 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.
    Subject code 290 ; 551
    Language English
    Publisher Elsevier
    Publishing country de
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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