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Revisiting internal gravity waves analysis using GPS RO density profiles: comparison with temperature profiles and application for wave field stability study

机译：使用GPS RO密度型材重新检测内部重力波分析：与温度分布的比较和波场稳定性研究的应用

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We revise selected findings regarding the utilization of Global Positioning System radio occultation (GPS RO) density profiles for the analysis of internal gravity waves (IGW), introduced by Sacha et al. (2014). Using various GPS RO datasets, we show that the differences in the IGW spectra between the dry-temperature and dry-density profiles that were described in the previous study as a general issue are in fact present in one specific data version only. The differences between perturbations in the temperature and density GPS RO profiles do not have any physical origin, and there is not the information loss of IGW activity that was suggested in Sacha et al. (2014). We investigate the previously discussed question of the temperature perturbations character when utilizing GPS RO dry-temperature profiles, derived by integration of the hydrostatic balance. Using radiosonde profiles as a proxy for GPS RO, we provide strong evidence that the differences in IGW perturbations between the real and retrieved temperature profiles (which are based on the assumption of hydrostatic balance) include a significant nonhydrostatic component that is present sporadically and might be either positive or negative. The detected differences in related spectra of IGW temperature perturbations are found to be mostly about ±10?%. The paper also presents a detailed study on the utilization of GPS RO density profiles for the characterization of the wave field stability. We have analyzed selected stability parameters derived from the density profiles together with a study of the vertical rotation of the wind direction. Regarding the Northern Hemisphere the results point to the western border of the Aleutian high, where potential IGW breaking is detected. These findings are also supported by an analysis of temperature and wind velocity profiles. Our results confirm advantages of the utilization of the density profiles for IGW analysis.
机译：我们修改了关于使用Sacha等人引入的内部重力波（IGW）的全球定位系统无线电掩星（GPS RO）密度剖面的所选结果。 （2014）。使用各种GPS RO数据集，我们表明，在前一项研究中描述的干燥温度和干密度分布之间的IGW光谱之间的差异实际上存在于一个特定的数据版本中。温度和密度GPS RO谱之间的扰动之间的差异没有任何物理来源，并且没有在Sacha等人中提出的IGW活动的信息丢失。 （2014）。我们在利用GPS RO干温型材时，研究了先前讨论过的温度扰动性质的问题，通过静水平衡的整合来源。使用无线电探剂配置文件作为GPS RO的代理，我们提供了强有力的证据表明，真实和检索的温度曲线之间的IGW扰动的差异（基于静水压平衡的假设）包括显着的非水腐蚀组分，其偶然存在，并且可能是要么是积极的还是消极的。发现IGW温度扰动相关光谱的检测到差异大约为±10？％。本文还提出了一种详细研究，用于利用GPS RO密度分布，以表征波场稳定性。我们已经分析了从密度分布衍生的选择稳定性参数以及风向垂直旋转的研究。关于北半球的结果指出了阿列丁高的西部边界，其中检测到潜在的IGW破裂。这些发现也通过对温度和风速谱的分析来支持。我们的结果证实了利用IGW分析密度型材的优势。

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