Search Results 1-20 of 233

  • Impacts of Global Climate Change on the Future Ocean Wave Power Potential: A Case Study from the Indian Ocean

    Karunarathna Harshinie , Maduwantha Pravin , Kamranzad Bahareh , Rathnasooriya Harsha , Silva De Kasun

    … Although a detailed analysis of monthly and annual average wave power under both "present" and "future" climates reveals a strong seasonal and some degree of inter-annual variability of wave power, a notable decadal-scale trend of variability is not visible during the simulated 25-year periods. …

    Energies 13(11), 3028-3028, 2020-06

    IR 

  • Increase in the Number of Tropical Cyclones Approaching Tokyo since 1980

    YAMAGUCHI Munehiko , MAEDA Shuhei

    … As the Pacific Decadal Oscillation (PDO) is in a positive phase in P1 and a negative phase in many years of the P2 period, decadal oscillations may have played some role in the increase in the number of approaching TCs and in the changes in the synoptic environment.</p> …

    Journal of the Meteorological Society of Japan. Ser. II, 2020

    J-STAGE 

  • Decadal variability of sea surface temperature around Japan  [in Japanese]

    Yoshita Kumi , Kitamura Yoshiteru , Nakano Toshiya

    <p>日本近海の海面水温(SST)に見られる十年規模変動の特性を,大気循環場との関係や季節による相違に着目して調べた。日本近海を対象とした経験的直交関数(EOF)解析の結果から,通年の第1モードは冬季の第1モードに,通年の第2モードは夏季の第1モードに対応し,日本近海SSTの十年規模の主な変動が冬季と夏季における卓越モードの足し合わせで表現できることが分かった。冬季の第1モードの空間パ …

    Oceanography in Japan 29(2), 19-36, 2020

    J-STAGE 

  • Interannual-decadal sea-surface temperature variability in the southern hemisphere  [in Japanese]

    Morioka Yushi

    <p>南半球の亜熱帯から中緯度の海面水温に現れる経年変動は,海盆の南西部と北東部に異なる符号の海面水温偏差を伴い,亜熱帯ダイポール現象として知られる。亜熱帯ダイポール現象に伴う正(負)の海面水温偏差は,混合層厚が平年より薄く(厚く)なった結果,日射による混合層の加熱が強まって(弱まって)生じることが本研究で明らかになった。また,混合層厚の偏差は,亜熱帯高気圧の変動に伴う潜熱フラックスの …

    Oceanography in Japan 29(1), 1-17, 2020

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  • Recent Breakdown of the Seasonal Linkage between the Winter North Atlantic Oscillation/Northern Annular Mode and Summer Northern Annular Mode

    Yamazaki Koji , Ogi Masayo , Tachibana Yoshihiro , Nakamura Tetsu , Oshima Kazuhiro

    Journal of Climate 32(2), 591-605, 2019-01

    IR 

  • Consistent Late Onset of the Western North Pacific Tropical Cyclone Season Following major El Niño Events

    ZHAO Haikun , WU Liguang , WANG Chao , KLOTZBACH Philip J.

    … <p> Most studies have focused on variations of tropical cyclone (TC) frequency, intensity, and track over the western North Pacific (WNP), but variability of WNP TC season onset date (TCSO) has been less studied. … This study has found that relationship between TCSO and SST underwent an inter-decadal change in the late 1990s, likely due to a climate shift that occurred around that time. …

    Journal of the Meteorological Society of Japan. Ser. II 97(3), 673-688, 2019

    J-STAGE 

  • Long-term variations of monsoon rainfall over Jakarta, Indonesia  [in Japanese]

    HAMADA Jun-Ichi , MATSUMOTO Jun , YAMANAKA Manabu D , HASAN Sunaryo , SYAMSUDIN Fadli

    … 本研究は、データが最も長期間得られ、沿岸域のメガシティとして広域首都圏を形成するジャカルタに焦点をあて、モンスーンに伴う降水の長期変動の特徴、及びENSO/PDO (Pacific Decadal Oscillation)との関連を明らかにすることを目的とする。 …

    Proceedings of the General Meeting of the Association of Japanese Geographers 2019s(0), 221, 2019

    J-STAGE 

  • Comparison of Surface Air Temperature between Observation and Reanalysis Data over Eastern China for the Last 100 Years

    ZHANG Siqi , REN Guoyu , REN Yuyu , SUN Xiubao

    … The results show that the inter-annual and decadal variabilities were consistent between reanalysis and observations in eastern China after 1979. … The inter-annual and decadal variability for winter and spring were consistent with the observations. … The correlation and standard deviation ratio between the reanalysis and observations demonstrated a high consistency of their inter-annual variability and dispersion. …

    Journal of the Meteorological Society of Japan. Ser. II 97(1), 89-103, 2019

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  • Decadal variability of Kuroshio and fishery catch  [in Japanese]

    伊藤 進一

    科学 88(6), 601-603, 2018-06

  • Fifty years of the 137°E repeat hydrographic section in the western North Pacific Ocean

    Oka Eitarou , Ishii Masao , Nakano Toshiya , Suga Toshio , Kouketsu Shinya , Miyamoto Masatoshi , Nakano Hideyuki , Qiu Bo , Sugimoto Shusaku , Takatani Yusuke

    Journal of oceanography 74(2), 115-145, 2018-04

  • Decadal variations of the transport and bifurcation of the Pacific North Equatorial Current

    Zhai Fangguo , Hu Dunxin , Li Peiliang

    Journal of oceanography 74(1), 65-80, 2018-02

  • Paleo studies on the last centuries to millennia using coastal sediments in the Seto Inland Sea, Japan  [in Japanese]

    Kuwae Michinobu

    <p>沿岸域の堆積物を用いた過去数百~数千年という比較的新しい時代を対象としたパレオ研究は,環境や生態系の長期動態とその現状を理解するという点で,今後も第四紀学の発展に重要な役割を果たすことが期待される.ここでは,これまで筆者と共同研究者が行ってきた豊後水道における海洋の温暖化や,豊後水道・別府湾における沿岸域海洋生態系の十年規模変動,イワシ類個体数の長期変動の3つのトピックを紹介し, …

    The Quaternary Research (Daiyonki-Kenkyu) 57(6), 175-195, 2018

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  • Irregular Mediterranean hydroclimate and North Atlantic Oscillation since the middle Holocene  [in Japanese]

    Hu Hsun―Ming

    <p>See Below</p>

    Abstracts of Annual Meeting of the Geochemical Society of Japan 65(0), 31, 2018

    J-STAGE 

  • Atlantic effects on recent decadal trends in global monsoon

    KAMAE Youichi , LI Xichen , XIE Shang-Ping , UEDA Hiroaki , 釜江 陽一 , 植田 宏昭

    … Natural climate variability contributes to recent decadal climate trends. … Specifically the trends during the satellite era since 1979 include Atlantic and Indian Ocean warming and Pacific cooling associated with phase shifts of the Atlantic Multidecadal Oscillation and the Pacific Decadal Oscillation, and enhanced global monsoon (GM) circulation and rainfall especially in the Northern Hemisphere. …

    Climate Dynamics 49(9-10), 3443-3455, 2017-11

    IR 

  • Long-term change and variation of salinity in the western North Pacific subtropical gyre revealed by 50-year long observations along 137°E

    Oka Eitarou , Katsura Shota , Inoue Hiroyuki , Kojima Atsushi , Kitamoto Moeko , Nakano Toshiya , Suga Toshio

    Journal of oceanography 73(4), 479-490, 2017-08

  • Early 20th-century Arctic warming intensified by Pacific and Atlantic multidecadal variability

    Tokinaga Hiroki , Xie Shang-Ping , Mukougawa Hitoshi

    … Here, we show that the concurrent phase shift of Pacific and Atlantic interdecadal variability modes is the major driver for the rapid early 20th-century Arctic warming. … Atmospheric model simulations successfully reproduce the early Arctic warming when the interdecadal variability of sea surface temperature (SST) is properly prescribed. …

    Proceedings of the National Academy of Sciences 114(24), 6227-6232, 2017-06-13

    IR 

  • Outcomes and challenges of global high-resolution non-hydrostatic atmospheric simulations using the K computer

    Satoh Masaki , Tomita Hirofumi , Yashiro Hisashi , Kajikawa Yoshiyuki , Miyamoto Yoshiaki , Yamaura Tsuyoshi , Miyakawa Tomoki , Nakano Masuo , Kodama Chihiro , Noda Akira T. , Nasuno Tomoe , Yamada Yohei , Fukutomi Yoshiki

    … Combining NICAM with high-performance computing has created new opportunities in three areas of research: (1) higher resolution global simulations that produce more realistic representations of convective systems, (2) multi-member ensemble simulations that are able to perform extended-range forecasts 10-30 days in advance, and (3) multi-decadal simulations for climatology and variability. …

    Progress in Earth and Planetary Science (4), 13, 2017-04-28

    IR 

  • Analytical studies on variabilities in the surface ocean in the western part of the North Pacific subtropics  [in Japanese]

    Sugimoto Shusaku

    <p>海洋表層には黒潮のような大規模循環があり,海域に固有の水温や塩分などで特徴付けられる水塊が分布する。筆者は,西部北太平洋亜熱帯域を対象に,海洋表層変動およびその気候変動における役割についての理解を深めるために解析的研究に取り組んできた。一連の研究を通して,(1) 冬季海面水温偏差再出現現象の三次元構造の理解,(2) 北太平洋中央部に存在するアリューシャン低気圧の南北位置変化に起因 …

    Oceanography in Japan 26(2), 45-61, 2017

    J-STAGE 

  • MIDDLE- AND LONG-TERM VARIATIONS OF SHORELINE CHANGE AT CHIRIHAMA BEACH, ISHIKAWA PREFECTURE, JAPAN  [in Japanese]

    UMEDA Shinya , FUKUI Takahiro , YUHI Masatoshi

    細砂の遠浅な海岸に多段砂州が発達する石川県千里浜海岸周辺の汀線の半年~20年程度の変動特性を解明するため,年2回23年間の汀線測量データを用いてEOF解析を行い,様々な時空間スケールの特徴的な変動成分の抽出を試みた.その結果,EOF上位2モードにより汀線の長期変化傾向と季節的変化を主に表す対照的な変動成分が捉えられた.周波数フィルタリングした上位4モードから得られた約5年周期の変動パターンは,砂州 …

    Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 73(2), I_769-I_774, 2017

    J-STAGE 

  • Low-Frequency Variability and Possible Changes in the North Pacific Simulated by CMIP5 Models

    WANG Jiangman , LI Chun

    … <p> The Pacific Decadal Oscillation (PDO) and North Pacific Gyre Oscillation (NPGO) are the two dominant low-frequency modes in the North Pacific. …

    Journal of the Meteorological Society of Japan. Ser. II 95(3), 199-211, 2017

    J-STAGE 

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