Search Results 1-20 of 70

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  • FATES AND DYNAMICAL ROLES OF PINCH-OFF MESOSCALE EDDIES FROM THE KUROSHIO EXTENSION JET ANALYZED WITH THE ARMOR3D DIAGNOSIS  [in Japanese]

    OKADA Nobue , UCHIYAMA Yusuke

    <p> 1993〜2017年の25年分の全球3次元海洋診断データARMOR3Dに対してwinding angle法に基づく渦抽出・追跡アルゴリズムを適用し,日本沿岸の黒潮域周辺における切離中規模渦の挙動を解析した.黒潮流軸と渦の距離や相対渦度履歴を用いて,黒潮続流から切離する中規模渦およびその後黒潮に再衝突する渦を自動抽出することに成功した.切離渦の発生に対しては北太平洋規模の中期的な …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 75(2), I_199-I_204, 2019

    J-STAGE 

  • Enhanced local recruitment of glass eel Anguilla japonica in Oyodo River, Miyazaki and offshore environmental conditions in 2002

    Aoki Kazuhiro , Yamamoto Toshihiro , Fukuda Nobuto , Yokouchi Kazuki , Kurogi Hiroaki , Setou Takashi , Kuroda Hiroshi , Kameda Takahiko , Takafuji Kazuhiro , Tokeshi Tsutomu

    Fisheries science 84(5), 777-785, 2018-09

  • Impact of cyclonic eddies and typhoons on biogeochemistry in the oligotrophic ocean based on biogeochemical/physical/meteorological time-series at station KEO

    Honda Makio C. , Sasai Yoshikazu , Siswanto Eko , Kuwano-Yoshida Akira , Aiki Hidenori , Cronin Meghan F.

    … Sea surface height anomalies and vertical profiles of water temperature in the upper 500 m showed cyclonic eddies passing station KEO and causing upwelling in late July–early August 2014 and November 2014. … This interpretation of the data is consistent with a simple 3D physical-biological model simulation that shows meso-scale cyclonic eddies can supply nutrient to support new production at KEO. …

    Progress in Earth and Planetary Science (5), 2018-08-20

    IR 

  • Eddy-driven nutrient transport and associated upper-ocean primary production along the Kuroshio

    Uchiyama Yusuke , Suzue Yota , Yamazaki Hidekatsu

    … The Kuroshio is one of the most energetic western boundary currents accompanied by vigorous eddy activity both on mesoscale and submesoscale, which affects biogeochemical processes in the upper ocean. … We examine the primary production around the Kuroshio off Japan using a climatological ocean modeling based on the Regional Oceanic Modeling System (ROMS) coupled with a nitrogen-based nutrient, phytoplankton and zooplankton, and detritus (NPZD) biogeochemical model in a submesoscale eddy-permitting configuration. …

    Journal of Geophysical Research: Oceans 122(6), 5046-5062, 2017-06

    IR 

  • Numerical study on the eddy-mean flow interaction between a cyclonic eddy and Kuroshio

    Geng Wu , Xie Qiang , Chen Gengxin , Zu Tingting , Wang Dongxiao

    Journal of oceanography 72(5), 727-745, 2016-10

  • Eddy-induced transport of the Kuroshio warm water around the Ryukyu Islands in the East China Sea

    Yuki Kamidaira , Yusuke Uchiyama , Satoshi Mitarai

    … A comparison of the modeled data demonstrated that the innermost submesoscale eddy-resolving model successfully reproduced the synoptic and mesoscale oceanic structures even without data assimilation. … therefore, eddy-induced transient processes are essential to the lateral transport of material within the strip between the Kuroshio and the islands. … The model indicated an evident predominance of submesoscale anticyclonic eddies over cyclonic eddies near the surface of this strip. …

    Continental Shelf Research (143), 206-218, 2016-07-15

    IR 

  • IMPACT OF MESOSCALE RECIRCULATION OF THE KUROSHIO ON ASYMMETRIC OCEANIC STRUCTURE AROUND OKINAWA ISLAND  [in Japanese]

    UCHIYAMA Yusuke , ODANI Sachika , YAMANISHI Takafumi , KAMIDAIRA Yuki , MITARAI Satoshi

    琉球諸島サンゴ礁生態系の維持に対して重要な役割を果たす黒潮系暖水波及に伴う沖縄本島東西海域における海洋構造の非対称性,特に黒潮反流の消長とそのメカニズムに着目した数値解析を行った.本島南端と渡嘉敷島を結ぶ浅海域の存在が鍵の一つになっており,潮汐の伝播特性に対してノードとなるほか,ここを通過する南向き流れの発達と黒潮本流および慶良間ギャップ通過流の流量変動とに良好な対応関係があることが明らかとなった …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72(2), I_481-I_486, 2016

    J-STAGE 

  • BIOGEOCHEMICAL RESPONSES TO MESOSCALE OCEANIC VARIABILITY IN THE KUROSHIO REGION ANALYZED WITH A ROMS-NPZD MODEL  [in Japanese]

    UCHIYAMA Yusuke , SUZUE Yota , YAMAZAKI Hidekatsu

    黒潮域での中規模海洋変動に対する一次生産の応答を評価するために,領域海洋循環モデルROMSとNPZD型生態系低次生産モデルをカップリングしたROMS-NPZDモデルを用いて,中規模渦解像・サブメソスケール渦許容気候値解析を行った.太平洋沿岸黒潮域(遠州灘沖)での一次生産は黒潮に伴う中規模渦の影響を強く受けるが,流軸北側の沿岸域では低気圧性中規模渦による局所的な湧昇によって一次生産が活発に起こるのに …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 72(2), I_1369-I_1374, 2016

    J-STAGE 

  • MESOSCALE OCEANIC RESPONSES TO TYPHOONS IN THE NORTHWESTERN PACIFIC  [in Japanese]

    UCHIYAMA Yusuke , TADA Hiroaki

    海面気圧による吸い上げ効果およびバルク法熱収支スキームを組み込んだJCOPE2-ROMSダウンスケーリング領域海洋モデルを構築し,我が国に上陸し甚大な土砂災害等をもたらした2014年台風18号,19号を対象とした広域高解像度再解析を行った.海上風,海面気圧,海面フラックスには,台風を含む詳細な気象場を高精度で表現可能な気象庁GPV-MSM再解析値を与えた.観測水位との比較を通じて本モデルが高潮偏差 …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 71(2), I_211-I_216, 2015

    J-STAGE 

  • Biogeochemical responses associated with the passage of a cyclonic eddy based on shipboard observations in the western North Pacific

    Sukigara Chiho , Suga Toshio , Toyama Katsuya [他]

    Journal of oceanography 70(5), 435-445, 2014-10

  • Kuroshio small meander southeast Kyushu and mesoscale eddies  [in Japanese]

    HIHARA Tsutomu , KUBOTA Masahisa , SETOU Takashi , SHIMIZU Manabu , AMBE Daisuke , Tsutomu Hihara , Masahisa Kubota , Takashi Setou , Manabu Shimizu , Daisuke Ambe , 東海大学大学院地球環境科学研究科 , 東海大学海洋学部 , 水産総合研究センター中央水産研究所 , 水産総合研究センター中央水産研究所 , 水産総合研究センター中央水産研究所 , School of Earth and Environmental Science Tokai University , School of Marine Science and Technology Tokai University , National Research Institute of Fisheries Science Fisheries Research Agency , National Research Institute of Fisheries Science Fisheries Research Agency , National Research Institute of Fisheries Science Fisheries Research Agency

    <p>九州南東岸沖において黒潮が蛇行する現象が知られており,黒潮小蛇行と呼ばれている。これまでに,多くの研究が,黒潮小蛇行の発生に対して中規模渦の影響を指摘している。そこで,本研究ではwinding-angle methodを用いて中規模渦の位置を推定し,黒潮小蛇行の発生と中規模渦との関係を調べた。初めに,黒潮流軸の位置情報から黒潮小蛇行の発生状況を調べ,時空間スケールが比較的大きい黒 …

    Oceanography in Japan 22(4), 119-146, 2013-07-15

    J-STAGE  References (26)

  • Temperature and salinity variability shorter than one month based on daily CTD observation in spring off the southeast coast of Hokkaido and its comparison with annual change from repeat observations on A-line  [in Japanese]

    SATO Masatoshi , KONO Tokihiro , SHIMIZU Yugo , Masatoshi Sato , Tokihiro Kono , Yugo Shimizu , 北海道立総合研究機構函館水産試験場 , 東海大学生物学部海洋生物科学科 , 水産総合研究センター中央水産研究所海洋・生態系研究センター , Hokkaido Research Organization Fisheries Research Department Hakodate Fisheries Research Institute , TOKAI University School of Biological Sciences Department of Marine Biology and Sciences , National Research Institute of Fisheries Science

    <p>親潮をモニタリングするために設計された北海道南東沖Aライン上の測点で2007年4月に行われた毎日CTD観測から日々スケールの水温・塩分の変化を調べ,2006年11月-2007年10月に行われた1-3か月間隔の通常のAライン観測による1年間の変化と比較を行った.短期変化における水温,塩分の標準偏差は,表層10 m では水温0.88-1.34 ℃,塩分0.11-0.19で,26.6- …

    Oceanography in Japan 22(3), 71-84, 2013-05-15

    J-STAGE  References (18)

  • Intensification of the South Side of the Asian Jet Stream during the Northern Winter in CMIP5 models

    Harada Masashi , Hirahara Shoji , Hagiya Satoshi , Murai Hirokazu , Oikawa Yoshinori , Maeda Shuhei

    … The strengthening of the jet stream on the south side is associated with cyclonic (anticyclonic) circulation anomalies in the upper (lower) troposphere over the southern part of China and decreased upper tropospheric divergence over the Maritime Continent. … The strength of the upper tropospheric divergence and the amplitude of the anticylonic eddy streamfunction are strongly correlated. …

    SOLA 9(0), 94-97, 2013

    J-STAGE 

  • Upper Ocean Responses to typhoons in the Northwestern Pacific

    Hong Chul-Hoon , Masuda Akira , Yoon Jong-Hwan , 増田 章 , 尹 宗煥

    … A striking feature in the model is an existence of a cyclonic eddy (CE) formed in the rear of the typhoon, even though it has not been observed yet. …

    Reports of Research Institute for Applied Mechanics,Kyushu University (143), 55-62, 2012-09

    IR  DOI 

  • The numerical simulation of seasonal variability of the upper circulation in the Okhotsk Sea

    Fayman Pavel A. , Yoon Jong-Hwan

    … Model currents agree well with geostrophic currents derived from satellite data (AVISO) except the Kuril Basin and the southern part of the central Okhotsk Sea with dominant eddy activities. … The inflow through the eastern Kuril straits and outflow through the western Kuril straits intensify the general cyclonic circulation of the Okhotsk Sea in winter as well as the wind and wind stress curl. …

    Reports of Research Institute for Applied Mechanics,Kyushu University (142), 1-20, 2012-03

    IR  DOI 

  • Distributions of nutrients and planktons around the cyclonic eddy observed in the eastern area of the Tsushima Islands in November 2007  [in Japanese]

    ONITSUKA Goh , TAKIKAWA Tetsutaro , KOBARI Toru , MOKU Masatoshi , MORIMOTO Akihiko , WATANABE Atsushi , YOSHIKAWA Yutaka , YANAGI Tetsuo

    海と空 87(1), 11-19, 2011-10-30

    References (31)

  • Meteorological influences of SST anomaly over the East Asian marginal sea on subpolar and polar regions: A case of an extratropical cyclone on 5-8 November 2006

    Ueda Ami , Yamamoto Masaru , Hirose Naoki

    … The eddy-resolving Japan Sea (East Sea) data assimilation affects the mid-level troposphere via vertical wind in the early stage of an explosively developing extratropical cyclone on 5-8 November 2006, and its influence further propagates toward the subpolar and polar regions. … The differences in atmospheric and surface temperatures are widely and rapidly spread over the polar region by strong synoptic-scale cyclonic advection. …

    Polar science 5(1), 1-10, 2011-04

  • Seismic Oceanography : physical oceanography using MCS data  [in Japanese]

    YOKOTA K. , KATSUMATA K. , YAMASHITA M. , FUKAO Y. , KODAIRA S. , MIURA S. , K. Yokota , K. Katsumata , M. Yamashita , Y. Fukao , S. Kodaira , S. Miura , 海洋研究開発機構地球内部ダイナミクス領域:海洋研究開発機構地球環境変動領域:大成建設株式会社技術センター , 海洋研究開発機構地球環境変動領域 , 海洋研究開発機構地球内部ダイナミクス領域 , 海洋研究開発機構地球内部ダイナミクス領域 , 海洋研究開発機構地球内部ダイナミクス領域 , 海洋研究開発機構地球内部ダイナミクス領域 , Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Institute for Research on Earth Evolution (IFREE):Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Research Institute for Global Change (RIGC) , Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Research Institute for Global Change (RIGC) , Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Institute for Research on Earth Evolution (IFREE) , Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Institute for Research on Earth Evolution (IFREE) , Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Institute for Research on Earth Evolution (IFREE) , Japan Agency for Marine-Earth Science and Technology (JAMSTEC) Institute for Research on Earth Evolution (IFREE)

    … We exemplify the utility of MCS data in physical oceanography using an image of a cyclonic eddy in the Izu-Ogasawara region. …

    Oceanography in Japan 19(6), 317-326, 2010-11-05

    References (16) Cited by (1)

  • Upwelling induced by meso-scale cyclonic eddies in the Andaman Sea (Special section for JSPS multilateral core university program on "coastal marine science": proceedings on 4th JSPS-VAST joint seminar on 'coastal marine science', Hai Phong, Viet Nam, 26-28 October 2009) -- (Special section: Oceanography)

    Buranapratheprat Anukul , Laongmanee Penchan , Sukramongkol Natinee [他]

    … Satellite altimetry and the surface geostropic current captured during the same period of the field survey, suggest that upwelling is induced by cyclonic eddies. …

    Coastal marine science 34(1), 68-73, 2010

    IR  DOI 

  • A Numerical Study of the Seasonal Circulation in the Seto Inland Sea, Japan

    CHANG PIL-HUN , GUO XINYU , TAKEOKA HIDETAKA

    Journal of oceanography 65(6), 721-736, 2009-12-01

    References (39) Cited by (2)

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