A cyclonic eddy train and poleward heat transport in the Australian-Antarctic Basin

The Tenth Symposium on Polar Science/Ordinary sessions: [OM] Polar Meteorology and Glaciology, Thu. 5 Dec. / 2F Auditorium , National Institute of Polar Researc

Dynamics and energetics of trapped diurnal internal Kelvin waves around a midlatitude lsland

Author Posting. © American Meteorological Society, 2017. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 47 (2017): 2479-2498, doi:10.1175/JPO-D-16-0167.1.The generation of trapped and radiating internal tides around Izu‐Oshima Island located off Sagami Bay, Japan, is investigated using the three-dimensional Stanford Unstructured Nonhydrostatic Terrain-following Adaptive Navier–Stokes Simulator (SUNTANS) that is validated with observations of isotherm displacements in shallow water. The model is forced by barotropic tides, which generate strong baroclinic internal tides in the study region. Model results showed that when diurnal K1 barotropic tides dominate, resonance of a trapped internal Kelvin wave leads to large-amplitude internal tides in shallow waters on the coast. This resonance produces diurnal motions that are much stronger than the semidiurnal motions. The weaker, freely propagating, semidiurnal internal tides are generated on the western side of the island, where the M2 internal tide beam angle matches the topographic slope. The internal wave energy flux due to the diurnal internal tides is much higher than that of the semidiurnal tides in the study region. Although the diurnal internal tide energy is trapped, this study shows that steepening of the Kelvin waves produces high-frequency internal tides that radiate from the island, thus acting as a mechanism to extract energy from the diurnal motions.This study was supported by JST CREST Grant Number JPRMJCR12A6.2018-04-1

Characteristics of bottom boundary mixing across the shelf edge off Cape Darnley, Antarctica

第2回極域科学シンポジウム/第34回気水圏シンポジウム 11月17日（木） 統計数理研究所 セミナー室

Effects of cabbeling and thermobaricity on AABW and MCDW formation around 110°E-140°E in Southern Ocean

第3回極域科学シンポジウム/第35回極域気水圏シンポジウム 11月29日（木） 国立国語研究所 ２階多目的

Structure of Meridional Circulation in Southern Ocean captured by long term Mooring

The Tenth Symposium on Polar Science/Ordinary sessions: [OM] Polar Meteorology and Glaciology, Wed. 4 Dec. / Entrance Hall (1st floor) , National Institute of Polar Researc

Long-term temperature trend of AASW and oceanic condition off Lützow Holm Bay

第2回極域科学シンポジウム/第34回気水圏シンポジウム 11月17日（木） 統計数理研究所 セミナー室

Distribution and behavior of bottom water in Tokyo Bay in summer : Role of wind on outflow of poor oxygen water

東京水産大学練習船東京水産大学環境システム学講座東京水産大学練習船東京水産大学環境システム学講座東京水産大学練習船東京水産大学環境システム学講

ダイ52ジ ニホン ナンキョク チイキ カンソクタイ ナツタイ ニ オケル トウキョウカイヨウダイガク ウミタカマル カンソク ホウコク

第52次日本南極地域観測隊(JARE-52)では,南極地域観測第VIII期6か年計画(平成22-27年度)の第1年次として重点研究観測及び一般研究観測の課題を実施するため,東京海洋大学練習船「海鷹丸」の南極海航海おいて海洋観測を実施した.主として,南極海の温暖化,大気中二酸化炭素濃度増加に伴う海洋酸性化などの変化が生態系に与える影響,及びプランクトン群集組成の変動と環境変動との関係の解明を目指すことが目的である.今回の観測航海は,「海鷹丸」の平成22年度遠洋航海UM-10-04のうち,フリーマントル─ホバート間(2010年12月24日～2011年1月22日)において,東経110度線,東経140度線を中心とした二つの海域で行われた.特に,東経110度の南緯57度～62度においては,「海鷹丸」観測に加え, 2010年12月初旬及び2011年3月初旬に「しらせ」が同一海域で観測を行い,時系列観測となっている.A marine science cruise was undertaken during December 2010 and January 2011 on board the Research and Training Vessel Umitaka-Maru, operated by Tokyo University of Marine Science and Technology (TUMSAT), to accomplish projects of the six-year plan Phase VIII of the Japanese Antarctic Research Expeditions (JARE-52 to -57). The projects and the cruise were planned to investigate the responses of Antarctic marine ecosystems to environmental changes related to global warming and oceanic acidification, and to study plankton community structure and environmental parameters. One of the main aims of the projects was to clarify the life cycle and physiology of plankton with shells of calcium carbonate (e.g., pteropods and coccolithophores), because these plankton are regarded to be the most sensitive to oceanic acidification. We performed net castings to qualitatively estimate the vertical distribution of plankton, made hydrographical observations, took measurements of dissolved inorganic carbonates in seawater, deployed a year-around mooring with sediment traps, made observations of a surface drifting buoy with a sediment trap and sensors to measure environmental parameters, and performed onboard acidified culture experiments using pteropods. The RT/V Umitaka-Maru departed from Fremantle, Australia, on 24 December 2010, cruised to the study area around the marginal sea ice zone (along 110°E and 140°E), and returned to Hobart, Australia, on 22 January 2011. The cruises by the icebreaker Shirase (JARE-52) in December 2010 and March 2011 followed the same study area as that described above, along 110°E, in order to perform repeat observations

Current structure observed in the central equatorial Pacific Ocean

東京水産大学環境システム学講座東京水産大学海鷹丸東京水産大学海鷹丸東京水産大学海鷹丸東京水産大学海鷹丸東京水産大学環境システム学講座東京水産大学海鷹