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

Sato Masatoshi, Kono Tokihiro, Shimizu Yugo

doi:10.5928/kaiyou.22.3_71

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Other Title

北海道南東沖Aライン上における春季の毎日CTD観測に基づく1か月より短い水温・塩分の変化と年変化との比較
ホッカイドウナントウオキ Aラインジョウニオケルシュンキノマイニチ CTD カンソクニモトズク 1カゲツヨリミジカイスイオン・エンブンノヘンカトネンヘンカトノヒカク

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Abstract

<p>We examined short-term variability in temperature and salinity in the Oyashio south of Hokkaido on the basis of daily CTD observations conducted during April 2007 at the two of the stations on A-line, which has been observed repeatedly with a few months interval since 1988. The standard deviations of temperature and salinity from the daily CTD observation were 0.88-1.34 °C, 0.11-0.19 at the sea surface (10 m) and 0.18-0.88 °C, 0.02-0.11 at the examined density surfaces 26.6 σθ, 26.8 σθ, 27.0 σθ and 27.2 σθ, respectively. The standard deviation of the daily observation was 11-30% of the annual standard deviations at the sea surface and over the 100% at densities 26.6-27.2 σθ, where the annual standard deviations were estimated from regular observations on A-line during November 2006 to October 2007. The short-term variations in April 2007 were dominated by 9-16 days periods in the satellite derived sea-surface temperature. These variations are explained by the movements of an anti-cyclonic eddy, the advection of the Coastal Oyashio Water and warm water from Kuroshio around the observation sites. We should pay attention to these processes in this area when analyzing the regular A-line observation data.</p>

Journal

Oceanography in Japan

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

The Oceanographic Society of Japan

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