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首页> 外文期刊>Journal of oceanography >Monitoring the Kuroshio Extension with Dynamically Constrained Synthesis of the Acoustic Tomography, Satellite Altimeter and in situ Data
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Monitoring the Kuroshio Extension with Dynamically Constrained Synthesis of the Acoustic Tomography, Satellite Altimeter and in situ Data

机译：用动态层析成像，卫星测高仪和原位数据的动态约束合成来监视黑潮扩展

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A finite-difference quasigeostrophic (QG) model of an open ocean region has been employed to produce a dynamically constrained synthesis of acoustic tomography and satellite altimetry data with in situ observations. The assimilation algorithm is based upon the 4D variational data interpolation scheme controlled by the model's initial and boundary conditions. The data sets analyzed include direct and differential travel times measured at the array of five acoustic transceivers deployed by JAMSTEC in the region of the Kuroshio Extension in 1997, Topex/Poseidon altimetry, CTD soundings, and ADCP velocity profiles. The region monitored is located within the area 27.5°–36.5°N, 143°–155°. The results of assimilation show that mesoscale variability can be effectively reconstructed by five transceivers measuring direct and reciprocal travel times supported by relatively sparse in situ measurements. The misfits between model and data lie within the observational error bars for all the data types used in assimilation. We have compared the results of assimilation with the statistical inversion of travel time data and analyzed energy balances of the optimized model solution. Energy exchange between the depth-averaged and shear components of the observed currents reveals a weak decay of the barotropic mode at the rate of 0.2 ± 0.7?10?5 cm2/s3 due to topographic interaction. Mean currents in the region are unstable with an estimate of the available potential energy flux from the mean current to the eddies of 4.7 ± 2.3?10?5 cm2/s3. Kinetic energy transition has the same sign and is estimated as 2.8 ± 2.5?10?5 cm2/s3. Potential enstrophy is transferred to the mesoscale at a rate of 5.5 ± 2.7?10?18 s?3. These figures provide observational evidence of the properties of free geostrophic turbulence which were predicted by theory and observed in numerical experiments.
机译：一个开放海洋区域的有限差分准地转（QG）模型已经被用来产生动态层析成像和卫星测高数据的动态约束合成与原位观测。同化算法基于受模型的初始条件和边界条件控制的4D变异数据插值方案。分析的数据集包括在1997年JAMSTEC在黑潮扩展区部署的五个声波收发器阵列上测得的直接和差分传播时间，Topex /波塞冬测高仪，CTD测深和ADCP速度剖面。监视区域位于27.5°–36.5°N，143°–155°区域内。同化的结果表明，可以通过五个收发器测量相对稀疏的原位测量所支持的直接和反向行进时间，来有效地重构中尺度变化。对于同化中使用的所有数据类型，模型和数据之间的失配位于观察误差条内。我们将同化的结果与旅行时间数据的统计反演进行了比较，并分析了优化模型解决方案的能量平衡。所观察到的电流的深度平均和剪切分量之间的能量交换显示，由于地形相互作用，正压模式的衰减速率为0.2±0.7？10？5 cm2 / s3。该区域的平均电流不稳定，估计从平均电流到涡流的可用势能通量估计为4.7±2.3？10？5 cm2 / s3。动能跃迁具有相同的符号，估计为2.8±2.5？10？5 cm2 / s3。潜在的涡旋以5.5±2.7？10？18 s？3的速率转移到中尺度。这些图提供了理论上预测并在数值实验中观察到的自由地转湍流特性的观测证据。

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