沿岸水位からみた対馬暖流沿岸分枝流の季節変化  [in Japanese] Seasonal Variation in the Nearshore Branch of the Tsushima Warm Current as Inferred from Coastal Sea Level Data  [in Japanese]

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Abstract

対馬暖流沿岸分枝流の季節変化を明らかにするために,日本列島沿岸の26地点,沖合に点在する島の7地点,計33地点の検潮所における6年間(1998~2003年)の月平均水位資料を解析した。本解析では沖合島とその対岸の水位差,列島に沿った水位勾配の各経月変化をもとに,沿岸分枝流の波路に沿った表層流の季節変化を推測した。その結果,沿岸分枝流の北上流強化は夏季(4月~8月)と晩秋から冬季(11月~12月)にかけての年2回程度あることが推測され,これらの強化には地理的な違いがあることが明らかになった。6年平均でみた場合,夏季の強化は流入口(対馬海峡)から佐渡島付近までの南部海域で,晩秋から冬季にかけての強化は流入口付近と流出口(津軽海峡)を含む佐渡島以北の海域で主に卓越していた。ただし,両海域における冬季から晩秋にかけての強化はそれぞれ独立した現象であることが推測された。なお,個々の北上流強化の強さや出現海域は経年的に大きく変化していた。Seasonal variations of the Nearshore Branch (NB) of the Tsushima Warm Current (TWC) were investigated using the monthly mean coastal sea level records of 26 tide-stations along the Japanese coast and 7 tide-stations of off-shore islands during recent 6 years (1998~2003). To infer the seasonal variability of surface flow along the path of the NB, we examined the sea level difference between the offshore islands and their neighboring Japanese coast, and the coastal sea level gradient on the downstream of the NB. It is inferred that the seasonal variation of the NB is characterized by the biannual intensifications of northward flow, i.e., both during summer (April~August) and during winter (November~December). In the mean annual state during 6 years, the summer-time intensification is dominant around the southern region from the inflow-mouth (Tsushima Strait) to around the Sado-Island, while the winter-time intensification is dominant mainly around the inflow-mouth and north of the Sado-Island also including the outflow-mouth (Tsugaru Strait). However, it is suggested that these winter-time intensifications in both regions are independent phenomena of each other. However, strength and predominant area of individual intensifications varied interannually.

Journal

  • Oceanography in Japan

    Oceanography in Japan 16(3), 223-236, 2007-05-05

    日本海洋学会

References:  21

Cited by:  2

  • Modeling of the Branches of the Tsushima Warm Current in the Eastern Japan Sea

    KAWAMURA HIDEYUKI , ITO TOSHIMICHI , HIROSE NAOKI , TAKIKAWA TETSUTARO , YOON JONG-HWAN

    Journal of oceanography 65(4), 439-454, 2009-08-01

    References (31) Cited by (1)

  • Seasonal Variations of Water System Distributions and Flow Patterns off the West Coast of Hokkaido  [in Japanese]

    HIGAKI Naoyuki , ISODA Yutaka , ISOGAI Yasuhiro , YAHABA Hiroshi , Naoyuki Higaki , Yutaka Isoda , Yasuhiro Isogai , Hiroshi Yahaba , 北海道立地質研究所 , 北海道大学大学院水産科学研究院 , 北海道大学大学院水産科学研究院 , 北海道大学大学院水産科学研究院 , Geological Survey of Hokkaido , Graduate School of Fisheries Sciences Hokkaido University , Graduate School of Fisheries Sciences Hokkaido University , Graduate School of Fisheries Sciences Hokkaido University

    Oceanography in Japan 17(4), 223-240, 2008-07-05

    References (28) Cited by (2)

Codes

  • NII Article ID (NAID)
    110006274434
  • NII NACSIS-CAT ID (NCID)
    AN10382760
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    09168362
  • NDL Article ID
    8815072
  • NDL Source Classification
    ZM44(科学技術--地球科学--海洋・陸水・火山)
  • NDL Call No.
    Z15-778
  • Data Source
    CJP  CJPref  NDL  NII-ELS 
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