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Title: 日本海表層の塩分変動に及ぼす長江希釈水の影響
Other Titles: Impacts of the Changjiang diluted water on the variability of surface layer salinity in the Japan Sea
Authors: 千手, 智晴1 Browse this author
Authors(alt): Senjyu, Tomoharu1
Issue Date: 31-Mar-2016
Publisher: 低温科学第74巻編集委員会
Journal Title: 低温科学
Journal Title(alt): Low Temperature Science
Volume: 74
Start Page: 77
End Page: 84
Abstract: 日本海内部の長江希釈水の移流時間スケールを,2008 年夏季に得られた定置塩分データから見積もった.対馬海峡東水道から流入した長江希釈水は,対馬海流沿岸分枝によって輸送され,対馬海峡から能登半島まで約1ヶ月,さらに津軽海峡まで約1 ヶ月の,合計約2 ヶ月の時間スケールで日本海を通過していると推定された.これに基づき,対馬海峡と能登半島北西沖海域での塩分の経年変動について特異値分解解析を行った.その結果,両海域には1ヶ月のラグをもって同位相で変動する経年変動が存在することが示された.このことは,長江流量の変動に関連した塩分変動が,少なくとも日本海中部海域にまで及んでいることを示している.
Advection time scale of the Changjiang diluted water (CDW) in the Japan Sea was estimated from the surface layer salinity data at some coastal fixed points in summer 2008. The CDW from the eastern channel of the Tsushima Strait is transported by the coastal branch of the Tsushima Current, and spends about one month to Noto Peninsula and further takes about one month to the Tsugaru Strait. This indicates that the CDW takes about two months to pass through the Japan Sea. Singular value decomposition analysis was applied to the long-term salinity data in the Tsushima Strait and northwest of Noto Peninsula. The results show the in-phase interannual salinity variations in both regions with one month time lag. This fact indicates that the interannual variation in the Changjiang discharge affects on the surface layer salinity in the mid-Japan Sea region
Type: bulletin (article)
Appears in Collections:低温科学 = Low Temperature Science > 第74巻

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