Sea Surface Height Measurement Using a GNSS Wave Glider
Sea Surface Height Measurement Using a GNSS Wave Glider
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DOI：
10.1029/2018gl077950
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发表时间：
2018-06
影响因子：
5.2
通讯作者：
N. Penna;M. M. Morales Maqueda-M.;I. Martin;Jing Guo;P. Foden
中科院分区：
文献类型：
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作者：
N. Penna;M. M. Morales Maqueda-M.;I. Martin;Jing Guo;P. Foden
为了克服诸如验潮仪、卫星测高和全球导航卫星系统(GNSS)浮标等海面高度仪器的空间和时间限制，我们研究了配备大地测量GNSS接收器的无人驾驶、自行式波浪滑翔机水面飞行器的使用。厘米精度的瞬时海面高度测量是在北海13天的部署中演示的，在此期间，滑翔机穿越了大约600公里的轨道。利用全球导航卫星系统动态精密单点定位估计的椭球高度为5赫兹，在使用有限元解2014b模型对潮汐进行校正并使用2008年地球重力模型对大地水准面进行校正后，每小时动态海洋地形测量结果与英国气象局预测海洋同化模型-大西洋边缘模型7至6.1厘米的标准偏差一致。相反，在对潮汐和动态海洋地形进行改正后，在北海空间分辨率与地球重力模型2008的标准偏差为5.1厘米。每小时有效波高的测量结果与WaveWatch III模式和WaveNet浮标观测的结果一致，分别为17厘米和24厘米(标准差)，主波周期为1.4 S。这些精度是在阵风高达20米/S的情况下获得的。
To overcome spatial and temporal limitations of sea surface height instruments such as tide gauges, satellite altimetry, and Global Navigation Satellite Systems (GNSS) buoys, we investigate the use of an unmanned, self‐propelled Wave Glider surface vehicle equipped with a geodetic GNSS receiver. Centimetric precision instantaneous sea surface height measurement is demonstrated from a 13‐day deployment in the North Sea, during which the glider traversed a track of about 600 km. Ellipsoidal heights were estimated at 5 Hz using kinematic GNSS precise point positioning and, after correcting for tides using the Finite Element Solution 2014b model and for the geoid using the Earth Gravitational Model 2008, hourly dynamic ocean topography measurements agreed with those from the UK Met Office Forecasting Ocean Assimilation Model‐Atlantic Margin Model 7 to 6.1‐cm standard deviation. Conversely, on correcting for the tides and dynamic ocean topography, 5.1‐cm standard deviation agreement with Earth Gravitational Model 2008 at its North Sea spatial resolution was obtained. Hourly measurements of significant wave height agreed with the WAVEWATCH III model and WaveNet buoy observations to 17 and 24 cm (standard deviation), respectively, and dominant wave periods to 1.4 s. These precisions were obtained in winds gusting up to 20 m/s.