多源卫星高度计海面高度异常数据融合研究

发布时间：2019-01-06 18:49

【摘要】：海面高度异常是瞬时海平面相对于平均海平面的变化,其被广泛应用于海洋动力现象的研究。卫星高度计数据依靠大尺度、全天时、全天候的优势,实时对海面高度变化进行监测,为获取全球的海面高度异常数据提供了一种十分可靠且易行的手段。多星融合的高度计测高数据集明显提高了海面高度变化观测的空间分辨率和精度,同时为海洋中尺度动力现象研究提供了数据保障。本文主要依靠四颗同时在轨运行的卫星高度计,对获取的多星测高数据进行融合处理,得到了统一的海面高度异常网格化产品。本文联合使用ENVISAT、Jason-1、Jason-2以及HY-2四颗同时在轨运行的卫星高度计测高数据,首先经过数据编辑准则和各项地球物理及环境参数改正后,剔除了部分异常的测高数据,并通过一些具体的校正模型和改正参数,计算了各个卫星高度计数据的海面高度异常值。然后以Jason-2卫星高度计作为参考轨道,通过全球互交叉点和自交叉点海面高度异常差值最小化处理,使用平滑的三次样条函数对ENVISAT、Jason-1以及HY-2高度计进行了轨道误差校正,结果显示其互交叉点偏差在轨道误差校正后明显减少,并且自交差点偏差也相应的减小。最后基于处理得到的四颗高度计均一的、精度相当的全球沿轨海面高度异常数据,使用时空客观分析方法进行网格化融合处理,得到了全球空间分布均匀的、时空分辨率为(1/4)°和7天、规则的海面高度异常融合产品。基于本文融合得到的海面高度异常产品,在全球范围内以及西北太平洋区域分别与相同时间的AVISO分发的融合产品进行比对验证,结果显示本文融合产品与AVISO产品海面高度异常分布基本一致,并且二者的海面高度异常偏差的均方根值在3-4cm之间,证明了本文融合的海面高度异常产品的可靠性和准确性。最后基于本文融合的海面高度异常网格化产品,开展了全球以及西北太平洋区域的中尺度涡探测应用示范,检验了融合数据的应用能力。
[Abstract]:Sea surface height anomaly is the change of instantaneous sea level relative to mean sea level. It is widely used in the study of ocean dynamic phenomena. Satellite altimeter data depend on the advantage of large-scale, all-weather, real-time monitoring of sea surface height change, which provides a very reliable and easy way to obtain global sea surface height anomaly data. The multi-star fusion altimeter data set can improve the spatial resolution and accuracy of sea surface height change observation and provide data guarantee for the study of ocean mesoscale dynamic phenomena. This paper mainly relies on four satellite altimeters which are in orbit at the same time to fuse and process the acquired multi-satellite altimetry data and obtain a unified grid product of sea surface height anomaly. In this paper, the altimeter data of four satellites in orbit, ENVISAT,Jason-1,Jason-2 and HY-2, are used in this paper. The data editing criteria and the correction of geophysical and environmental parameters are used. The altimetry data of some anomalies are eliminated, and the sea surface height outliers of each satellite altimeter data are calculated through some concrete correction models and correction parameters. Then the Jason-2 satellite altimeter is used as the reference orbit to minimize the difference of sea surface height anomaly between the global intersection points and the self-intersection points, and the smooth cubic spline function is used to deal with the ENVISAT,. The orbit error of Jason-1 and HY-2 altimeter is corrected. The results show that the deviation of mutual crossing point is obviously reduced after the correction of orbit error, and the self-intersection error deviation is also reduced. Finally, based on the uniform and accurate data of the four altimeters, the method of temporal and spatial objective analysis is used for the mesh fusion processing, and the uniform global spatial distribution is obtained. The spatiotemporal resolution is (1 / 4) 掳and 7 days, and the regular sea surface height anomaly fusion product. Based on the sea surface height anomaly products fused in this paper, the fusion products distributed at the same time by AVISO in the global and the Northwest Pacific region are compared and verified. The results show that the sea surface height anomaly distribution of the fusion product and the AVISO product is basically the same, and the mean square root value of the sea surface height anomaly deviation of the two products is between 3-4cm, which proves the reliability and accuracy of the fusion sea surface height anomaly product. Finally, based on the mesoscale eddy detection model of the global and northwest Pacific regions, the application capability of the fusion data is tested.
【学位授予单位】：国家海洋局第一海洋研究所
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：P715.6

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