Argo、GTSPP与WOD数据集及其应用中需注意的若干问题

发布时间：2018-06-18 15:41

本文选题：Argo + GTSPP　；参考：《海洋通报》2016年02期

【摘要】：数据集整体的时空覆盖率制约了海洋科学研究的时空尺度,而海洋仪器的性能和观测方式直接决定了海洋数据的可靠性。以观测仪器作为主要衡量指标,结合数据集的时空覆盖率,对以温度和盐度为数据集主体的自持式拉格朗日环流剖面观测(Argo)数据集、全球温盐剖面数据集(GTSPP)、世界海洋数据集(WOD)进行分析和比对,确定了三者关系:Argo和GTSPP都是WOD的数据源,而GTSPP中包含了Argo实时数据的80%。在此基础上研究确定了目前温盐数据的主要观测仪器为Argo浮标、XBT和CTD,并对这三种仪器的误差来源和量级进行详细分析:由于全球自动观测与传输需求,Argo数据存在电子信号不稳定导致的随机误差,而且在高纬度强温跃层地带出现较强的虚假盐度尖峰,再是自由漂移的特性导致1%~2%盐度剖面漂移超过0.02 PSS-78;由于下降方程的不断演变,全球半数XBT数据提供者并未提供仪器型号,导致数据整体的可靠性下降;由于CTD基本采用船载观测,因此成本高、共享数据少且多集中近海。因此在对全球温盐数据进行应用时,应综合考虑观测仪器的可靠性和时空覆盖率,有效实现对资料本身误差和真实海洋现象的甄别。
[Abstract]:The space-time coverage of the whole data set restricts the space-time scale of marine scientific research, and the performance and observation mode of marine instruments directly determine the reliability of marine data. Taking the observational instrument as the main measure index and combining the spatial and temporal coverage of the data set, the self-sustaining Lagrangian circulation profile observation data set with temperature and salinity as the main body is studied. The global temperature profile data set (GTSPP) and the world ocean data set (WODs) are analyzed and compared, and it is determined that the three relationships: Argo and GTSPP are the data sources of WOD, and the GTSPP contains the real-time data of Argo. On this basis, the main observation instruments of temperature and salt data are determined as Argo buoy XBT and CTD, and the error source and order of error of these three instruments are analyzed in detail: due to the requirement of global automatic observation and transmission, Argo data exist. Random errors caused by the instability of electronic signals, Moreover, strong false salinity spikes appeared in the high-latitude and strong thermocline zones, and the characteristic of free drift resulted in the drift of 1% 2% salinity profile exceeding 0.02 PSS-78.Because of the continuous evolution of the descent equation, half of the global XBT data providers did not provide the instrument type. The reliability of the data as a whole is reduced, and the CTD uses shipborne observation, so it has high cost, less shared data and more concentrated offshore. Therefore, in the application of global temperature and salt data, the reliability and space-time coverage of observational instruments should be considered synthetically to effectively distinguish the errors of the data itself and the real ocean phenomena.
【作者单位】：国家海洋信息中心;
【基金】：国家自然科学基金(41406024)
【分类号】：P715

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