在墨西哥湾模拟和观测的成对分离的统计
Statistics of simulated and observed pair separations in the Gulf of Mexico
摘要：
对分离统计的现场和合成表面漂移部署在附近的\emph{Deepwater Horizon}网站在墨西哥湾的调查。合成轨迹来自1公里分辨率的数据同化海军沿海海洋模型（NCOM）模拟。现场漂移器在大LAgrangian部署（GLAD）中启动。不同的措施的分散计算和理论预测相比。对于NCOM对，措施表明在最小采样尺度的非本地对分散。当距离超过100公里时，电子对的运动是不相关的，表明是绝对的而不是相对的色散。然而，与GLAD漂移的统计数据表明当地的分散（其中对分离表现出幂律增长），与以前的研究结果一致。这种不一致部分源于惯性振荡，惯性振荡在小尺度上影响能级，而不会大大改变粒子的净位移。它们在GLAD中是显著的，但在NCOM模拟中弱得多。此外，GLAD漂移子发射的距离很近，几乎没有独立的实现，因此统计意义较弱。将NCOM集限制为在相同位置发射的那些，产生非常相似的统计数据。
英文摘要：
Pair-separation statistics of in-situ and synthetic surface drifters deployed near the \emph{Deepwater Horizon} site in the Gulf of Mexico are investigated. The synthetic trajectories derive from a 1-km-resolution data-assimilative Navy Coastal Ocean Model (NCOM) simulation. The in-situ drifters were launched in the Grand LAgrangian Deployment (GLAD). Diverse measures of the dispersion are calculated and compared to theoretical predictions. For the NCOM pairs, the measures indicate nonlocal pair dispersion at the smallest sampled scales. At separations exceeding 100 km, pair motion is uncorrelated, indicating absolute rather than relative dispersion. With the GLAD drifters however the statistics suggest local dispersion (in which pair separations exhibit power law growth), in line with previous findings. The disagreement stems in part from inertial oscillations, which affect the energy levels at small scales without greatly altering the net particle displacements. They were significant in GLAD but much weaker in the NCOM simulations. In addition the GLAD drifters were launched close together, producing few independent realizations and hence weaker statistical significance. Restricting the NCOM set to those launched at the same locations yields very similar statistics.
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