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    ADSの概要と日本の北極研究プロジェクト及び南極地域観測隊との連携

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    令和4年度ROIS-DS-JOINT2022共同研究集会「オープンサイエンス時代の重力観測・データの流通と利活用」日時:2022年12月19日(月)13:25〜12月20日(火)12:30場所:情報・システム研究機構データサイエンス共同利用基盤施設DS棟1F,大会議室H108-1,オンライン主催:情報・システム研究機構データサイエンス共同利用基盤施設極域環境データサイエンスセンタ

    昭和基地におけるローカル5G実証実験について

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    第19回南極設営シンポジウム2023年5月16日(火)Zoomウェビナーによるオンライン開催主催:国立極地研究

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    Interannual variability of surface bio-optical characteristics in the frontal zones of the Indian sector of the Southern Ocean during austral summer

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    Surface bio-optical constituents (Chl-a, light-absorption coefficient of phytoplankton (aph (443)), detritus (ad(443)), coloured dissolved organic matter (aCDOM(443))), and hydrographic variables were studied across the fronts along 57.5°E during 2011, 2013 and 2015 in the Indian sector of Southern Ocean to understand their interannual variability and phytoplankton pigment package effect. Latitudinal increases of Chl-a, aph(443), and aCDOM(443) were observed in 2011 and 2013. Mean Chl-a was higher in 2013 than in 2015 and 2011. The Chl-a specific absorption (a*ph(443)) latitudinally decreased implying ‘pigment package effect’ with increasing latitude. Interannually increase of aph blue (443)/red (675) ratio suggested higher non-photosynthetic absorption during 2013 and 2015 than in 2011. The relative contributions of bio-optical constituents to total absorption (at) showed interannual decrease in aph(443) and increase in aCDOM(443) and ad(443) inferring phytoplankton growth and decay phases. The robust aph(443)-Chl-a relationship during 2011 was used to derive aph(443) for other years, which holds good for in situ and satellite-derived counterparts. aCDOM(443) positively correlated with Chl-a and negatively with CDOM-spectral slope (S300-500), suggesting autochthonous sources. Satellite-retrieved Chl-a, aph(443) showed significant correlation (p < 0.001) with in situ data. This study provides baseline bio-optical data for understanding phytoplankton size-class, and improvement of bio-optical algorithms in this relatively inaccessible polar region

    PCB containment using geosynthetics in Canada\u27s Arctic

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    Two funnel-and-gate permeable reactive barriers (PRBs) with settling ponds comprised of a composite liner (geomembrane and geosynthetic clay liners (GCL)) were installed at Resolution Island (BAF-5), Nunavut to contain residual polychlorinated biphenyls (PCBs) moving with the sediment and annual snowmelt. The long-term performance of the geosynthetics used in the PRB funnels is studied for physical integrity and diffusive barrier properties after nine years of operation. Exhumed geomembrane specimens are compared with virgin material by index testing: diffusive resistance to benzene, toluene, ethylbenzene, and xylenes (BTEX) compounds, as well as puncture, burst, and tensile strength. Exhumed GCLs are evaluated concerning hydraulic conductivity, the mass of bentonite per unit area, and swell index. The migration of PCBs through the composite liner system by diffusion is modelled and the diffusive and sorptive properties of the geomembrane (Dg = 1.7 × 10−14 m2/s, Sgf = 160,000) and GCL (De = 3.1 × 10−10 m2/s, bentonite plus fibers layer Kd = 15 mL/g, cover geotextile Kd = 12,000 mL/g, and carrier geotextile Kd = 16,000 mL/g) were calculated. Modelling results estimate that the composite liner was successfully containing PCBs. This was confirmed by downgradient monitoring. The challenges of the location and terrain, PRB design, construction, and maintenance are discussed along with recommendations for designing PRBs in other remote and cold region environments

    南極上空大気重力波の気球実験におけるイリジウム衛星通信データの解析システムの構築

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    極域データサイエンスに関する研究集会日時:2023年2月20日(月)11:00〜18:00場所:情報・システム研究機構データサイエンス共同利用基盤施設DS棟1F(大会議室H108),オンライン主催:情報・システム研究機構データサイエンス共同利用基盤施設極域環境データサイエンスセンタ

    国土地理院におけるデータ共有に関する現状

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    令和4年度ROIS-DS-JOINT2022共同研究集会「オープンサイエンス時代の重力観測・データの流通と利活用」日時:2022年12月19日(月)13:25〜12月20日(火)12:30場所:情報・システム研究機構データサイエンス共同利用基盤施設DS棟1F,大会議室H108-1,オンライン主催:情報・システム研究機構データサイエンス共同利用基盤施設極域環境データサイエンスセンタ

    The rapid shift of intertidal macroalgal assemblage from vertical shoreline profiles in Barton Peninsula, King George Island, Antarctica during summer

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    Temporal variability and the vertical shoreline profile of an intertidal macroalgal assemblage were examined on the coast of Barton Peninsula, Maxwell Bay, King George Island, Antarctica. Sampling was performed during the three austral summer seasons from November 2016 to January 2019. The sampling interval for the summer shift was 1–2 months. Eighteen algal species were identified, with 75% relative coverage of the predominant red alga Iridaea cordata and endemic brown alga Phaeurus antarcticus. Temporal variation in the macroalgal assemblage showed 78.35% similarity between one month and 64.61% similarity between two months. Contour plots for visualizing macroalgal distribution were first attempted in this study, and compared to general distribution of tables and diagrams that were discontinuously expressed. The coastscape was expressed more quantitatively and continuously, and was also useful for explaining temporal changes such as summer abundance can be described as a shift from I. cordata to P. antarcticus. In addition, in terms of species composition, this study area corresponds to the middle to lower intertidal zone and shows the highest species diversity in King George Island, so it is expected to provide important information for the researches in Antarctic intertidal zones

    南極インフラサウンド観測活用のためのPSD及びFK解析可視化Webページ構築

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    極域データサイエンスに関する研究集会日時:2023年2月20日(月)11:00〜18:00場所:情報・システム研究機構データサイエンス共同利用基盤施設DS棟1F(大会議室H108),オンライン主催:情報・システム研究機構データサイエンス共同利用基盤施設極域環境データサイエンスセンタ

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