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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Cooling of the West Spitsbergen Current: Isopycnal diffusion by topographic vorticity waves
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Cooling of the West Spitsbergen Current: Isopycnal diffusion by topographic vorticity waves

机译：西斯匹次卑尔根流的冷却：地形涡旋波引起的等腰扩散

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摘要

We investigate the heat budget in the West Spitsbergen Current on the basis of theoretical considerations and current meter data across the slope at 78.83°N between September 1997 and September 1998. The dispersion relation for topographically trapped waves along the West Spitsbergen Slope with a barotropic along-slope velocity is calculated by use of an idealized numerical model. Signal processing and coherence calculations of the current meter data show that barotropic vorticity waves with enhanced energy at the diurnal period exist along the slope. A wave length of 32 km is given by the dispersion relation for the 24-hour period and a corresponding second mode with a 35-hour period. Coherence calculations and complex demodulations of the current meter time series confirm the spatial and temporal variations given by the dispersion relation. The eddy characteristics of the first two modes are used to estimate the heat loss of the warm core of the West Spitsbergen Current by isopycnal eddy diffusion. We present the first isopycnal heat loss estimates obtained through dynamical considerations of the West Spitsbergen Current and compare them with earlier diagnostic estimates for the mean heat loss in the subsurface layers. Within the standard errors we estimate the heat flux to be O(1000) W/m2 throughout the year except for the summer months June–July. If the 9798 heat flux time series are representative for the subsurface layer between 100 and 500 m depth, the heat loss is on the same order of magnitude as the mean winter value of 1050 W/m2 from earlier diagnostic estimates.
机译：我们基于理论上的考虑和1997年9月至1998年9月之间跨度为78.83°N的电流表数据，对西斯匹次卑尔根流中的热量收支进行了研究。边坡速度是通过使用理想化的数值模型来计算的。当前电表数据的信号处理和相干计算表明，沿坡道存在昼夜能量增强的正压涡旋波。通过24小时周期的色散关系和35小时周期的相应第二模式给出32 km的波长。当前仪表时间序列的相干计算和复杂解调确认了色散关系给出的空间和时间变化。前两种模式的涡流特性用于通过等渗涡流扩散来估算西斯匹次卑尔根流暖芯的热损失。我们介绍了通过西斯匹次卑尔根流的动力学考虑获得的第一个等渗热损失估算值，并将它们与地下层平均热损失的早期诊断估算值进行了比较。在标准误差范围内，我们估计除六月至七月的夏季月份外，全年的热通量为O（1000）W / m2。如果9798热通量时间序列代表了100至500 m深度之间的地下层，则热量损失与早期诊断估计得出的1050 W / m2的冬季平均值的数量级相同。

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