Andrea Hay, Christopher Watson, Benoit Legresy, Matt A. King, Jack Beardsley
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Directional comparisons to the Chinese-French Ocean SATellite (CFOSAT) SWIM instrument also show good agreement, with dominant directions having an RMSE of 9.1° (n=22), and correlation coefficients between the directional spectra ranging between 0.57 and 0.79. Initial sea level anomaly (SLA) estimates capture eddies propagating through the region. Comparisons show good agreement with daily gridded SLA products (RMSE = 0.03 m, n = 205), with scope for future improvement. These results demonstrate the utility of high rate geodetic GNSS observations on moored surface platforms in highly energetic regions of the ocean. Such observations are important to maximize the geophysical interpretation from altimeter missions. 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引用次数: 0
摘要
虽然卫星高度计已经彻底改变了海洋科学,但在高波浪环境下的验证测量很少。利用自2019年以来从南大洋通量站(SOFS, - 47°S, 142°E)收集的大地测量全球导航卫星系统(GNSS)数据,作为南大洋时间序列(SOTS)的一部分,我们对这一高能区域的卫星任务进行了验证。研究结果表明,SOFS的高速率GNSS观测可以成功地测量南大洋极端条件下的波浪,并获得所有波浪状态(有效波高,SWH,范围为1.5 m至12.6 m)的稳健测量结果,我们发现原位和最低点测高SWH之间的一致性很好(RMSE = 0.16 m,平均偏差= 0.04 m, n = 60)。与中法海洋卫星(CFOSAT) SWIM仪器的方向比较也显示出较好的一致性,优势方向的RMSE为9.1°(n=22),方向光谱的相关系数在0.57 ~ 0.79之间。初始海平面异常(SLA)估计捕获了在该区域传播的涡旋。对比显示与每日网格化SLA产品(RMSE = 0.03 m, n = 205)有良好的一致性,有未来改进的余地。这些结果证明了在海洋高能量区域的系泊地面平台上进行高速率大地测量GNSS观测的实用性。这些观测对于最大限度地利用高度计任务进行地球物理解释非常重要。特别是,提供同位置定向波观测和SLA估计的能力将有助于最近启动的地表水海洋地形(SWOT)任务的验证,在该任务中,了解海况和海面高度之间的相互作用是一个主要挑战。
In-Situ Validation of Altimetry and CFOSAT SWIM Measurements in a High Wave Environment
While satellite altimeters have revolutionized ocean science, validation measurements in high wave environments are rare. Using geodetic Global Navigation Satellite System (GNSS) data collected from the Southern Ocean Flux Station (SOFS, −47°S, 142°E) since 2019, as part of the Southern Ocean Time Series (SOTS), we present a validation of satellite missions in this energetic region. Here we show that high rate GNSS observations at SOFS can successfully measure waves in the extreme conditions of the Southern Ocean and obtain robust measurements in all wave regimes (significant wave height, SWH, ranging from 1.5 m to 12.6 m). We find good agreement between the in-situ and nadir altimetry SWH (RMSE = 0.16 m, mean bias = 0.04 m, n = 60). Directional comparisons to the Chinese-French Ocean SATellite (CFOSAT) SWIM instrument also show good agreement, with dominant directions having an RMSE of 9.1° (n=22), and correlation coefficients between the directional spectra ranging between 0.57 and 0.79. Initial sea level anomaly (SLA) estimates capture eddies propagating through the region. Comparisons show good agreement with daily gridded SLA products (RMSE = 0.03 m, n = 205), with scope for future improvement. These results demonstrate the utility of high rate geodetic GNSS observations on moored surface platforms in highly energetic regions of the ocean. Such observations are important to maximize the geophysical interpretation from altimeter missions. In particular, the ability to provide co-located directional wave observations and SLA estimates will be useful for the validation of the recently launched Surface Water Ocean Topography (SWOT) mission where understanding the interactions between sea state and sea surface height poses a major challenge.
期刊介绍:
The Journal of Atmospheric and Oceanic Technology (JTECH) publishes research describing instrumentation and methods used in atmospheric and oceanic research, including remote sensing instruments; measurements, validation, and data analysis techniques from satellites, aircraft, balloons, and surface-based platforms; in situ instruments, measurements, and methods for data acquisition, analysis, and interpretation and assimilation in numerical models; and information systems and algorithms.