To investigate the impact of current variations of the Oyashio on bottom pressure (BP) at observation stations PG1 (\(41.7040^{\circ }\hbox {N}\), \(144.4375^{\circ }\hbox {E}\)) and PG2 (\(42.2365^{\circ }\hbox {N}\), \(144.8454^{\circ }\hbox {E}\)), which are located in the onshore region of the Kuril Trench off Kushiro–Tokachi, altimetric sea surface height (SSH) and ocean bottom pressure (OBP) gauge data were evaluated. Two and a half years after El Niño, during 2007–2008 and 2012–2013, the Oyashio retreated toward the northeast in association with strong warm-core rings, which were inferred from SSH elevations at both stations. BP at PG1 near the offshore edge of the continental shelf is enhanced corresponding to the SSH elevations in a barotropic manner. Meanwhile, at PG2, BP remained relatively unchanged in spite of the high SSH variability because the main pycnocline adjusted rapidly to the SSH elevations. BP changes at PG1 caused by the northeastward retreat of the Oyashio cannot be neglected to detect BP change by crustal deformations.

中文翻译：

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与厄尔尼诺有关的海平面升高和海底压力增强，与日本北海道东南部大潮尾撤退有关

要研究Oyashio当前变化对观测站PG1（\（41.7040 ^ {\ circ} \ hbox {N} \），\（144.4375 ^ {\ circ} \ hbox {E} \））和PG2（\（42.2365 ^ {\ circ} \ hbox {N} \），\（144.8454 ^ {\ circ} \ hbox {E} \））位于Ku路市-十日市附近的千岛海沟的陆上区域，对高空海面高度（SSH）和海底压力（OBP）量规数据进行了评估。在厄尔尼诺事件发生后的两年半期间，在2007–2008年和2012–2013年期间，Oyashio撤回了东北，并伴有强烈的暖芯环，这是由两个站的SSH高度推断得出的。对应于SSH高程，大陆架近海边缘附近PG1处的BP以正压方式增强。同时，在PG2，尽管SSH的变化很大，但BP仍保持相对不变，这是因为主要比诺可林迅速适应SSH的升高。由Oyashio的东北退缩引起的PG1处的BP变化不能忽略以检测地壳变形引起的BP变化。