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首页> 外文期刊>Journal of Physical Oceanography >Observations of Tidally Induced Currents over the Continental Slope of the Laptev Sea, Arctic Ocean
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Observations of Tidally Induced Currents over the Continental Slope of the Laptev Sea, Arctic Ocean

机译：北冰洋拉普捷夫海陆坡上潮汐感生流的观测

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摘要

Two year-long (2004-05 and 2005-06) records of currents from two moorings deployed at the continental slope of the Laptev Sea (78°26'N, 125°40'E) are used in order to define the properties of tidal currents in the upper ~200-m ocean layer. Harmonic and spectral analyses of currents showed that the semidiurnal tidal constituent S_2 dominates over the semidiurnal M_2 and diurnal constituents. This dominance of the S_2 constituent in the tidal currents is due to resonant interaction of the superinertial wave with sloping bottom topography. In contrast to the tidal currents, sea level changes are dominated by the M_2 constituent, as seen from a tidal model by L. Padman and S. Erofeeva, using assimilation of observational data. Strong anti-correlation (-0.73 ± 0.05) was found between the upper 50-m S_2 current amplitudes and local sea ice concentration, with fourfold (from ～2.0 to 8.5 cm s~(-1)) amplification of tidal currents under ice-free conditions. This is probably due to a change of local resonance conditions for the S_2 tidal current. These findings may be important for understanding the increasing role of tides in a seasonally ice-free Arctic Ocean.
机译：为了定义拉普特夫海的大陆坡（78°26'N，125°40'E）的两个系泊流的两年（2004-05和2005-06）记录，约200米海层上部的潮流。潮流的谐波和频谱分析表明，半日潮汐成分S_2比半日潮汐M_2和昼夜成分占主导地位。潮汐流中S_2成分的这一优势是由于超惯性波与倾斜的底部地形的共振相互作用所致。与潮汐流相反，从L. Padman和S. Erofeeva的潮汐模型来看，使用观测数据的同化作用，海平面变化主要由M_2成分决定。在50 m S_2的较高电流幅值与局部海冰浓度之间发现强反相关（-0.73±0.05），在冰雪条件下潮汐电流放大了四倍（从〜2.0到8.5 cm s〜（-1））。免费条件。这可能是由于S_2潮汐电流的局部共振条件发生了变化。这些发现对于了解潮汐在季节性无冰的北冰洋中日益重要的作用可能是重要的。

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  • 来源
    《Journal of Physical Oceanography》 |2012年第1期|p.78-94|共17页
  • 作者

    A. V. Pnyushkov; I. V. Polyakov;

  • 作者单位

    International Arctic Research Center, University of Alaska Fairbanks, 930 Koyukuk Dr., P.O. Box 757340, Fairbanks, AK 99775;

    International Arctic Research Center, University of Alaska Fairbanks, Fairbanks, Alaska;

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