国产抛弃式温度剖面仪(XBT)资料质量分析

Quality Analysis on the Domestic Expendable Bathy Thermograph(XBT) Data

国家海洋技术中心根据科研需求研发了抛弃式温度剖面仪(XBT)等一系列抛弃式产品。针对2014年8月份在西太平洋海域投放的XBT和XCTD所获取的温度数据进行对比分析,单剖面结果显示两者相关系数达到了0.95,在温跃层处出现温度差,断面标准差分析结果为200 m以上温跃层处较大而200 m以下标准差较小,最大和最小标准差值分别为0.39和0.08。温度断面分析结果显示两者在同样的位置出现等值线的凹凸现象,对大洋水团特殊物理海洋现象描述基本一致。分析温跃层处两者温度存在偏差的原因有3个:不同传感器的不同响应时间引起的误差、深度测量公式的误差以及传感器本身的测量误差影响。国产XBT的数据质量较好,总体上性能能满足对环境复杂海域的快速走航观测,数据质量准确度和可靠性都较好。

To meet the research demand, the National Ocean Technology Center has developed a series of expendable products, including a kind of expendable bathy thermograph（XBT）. In the study, comparative analysis is conducted on the temperature data obtained by the XBT and XCTD deployed to the east of Taiwan in the western Pacific Ocean on August 2014. The results show that the single profile correlation coefficient of the two sets of data reaches 0.95, and temperature difference appears in the thermocline. The section standard deviation at the depth of 200 m above the thermocline is larger than that at a depth larger than 200 m, with the maximum and minimum value of 0.39 and 0.08, respectively. Temperature profile analysis on the two sets of data shows that the contour concavo-convex phenomenon appears in the same position and the description of special physical phenomenon of water masses in the ocean is broadly consistent. There are three reasons for the deviation of the two sets of temperature data at the thermocline： the errors due to different response times of different sensors, depth measuring equation error and the measuring error of the sensor itself. It can be concluded that the data quality of domestic XBT is good. Generally, its performance can meet the requirement of quick underway observation on complex water environment, and the accuracy and reliability of data are satisfying.