深远海声速资料对比及校正方法研究

Study on the Comparison and Correction Method of Far-reaching Sea Sound Velocity Data

为准确获取深远海海洋声速资料,充分了解深水声速规律,选取了西太地区两个水深超过5000 m的S1和S2站位的声速资料为研究对象,以SVP(声速剖面仪)实测资料为参考标准,通过对CTD资料利用Chen-Millero、Del-Grosso以及Wilson的3种经验公式计算的声速与SVP资料进行对比分析,得出Del-Grosso经验公式计算的声速误差最小。为进一步提高声速资料精度,对Del-Grosso公式进行修正,并利用另外3个站位数据进行验证,发现利用校正后的公式计算的声速资料精度明显提升,这为其他深远海区利用CTD或其他温盐深资料获取高精度声速资料提供参考。

In order to accurately obtain the far-reaching ocean sound velocity data and fully understand the law of deep-water sound velocity,the sound velocity data of two stations S1 and S2 with water depth over 5000 m in the Western Pacific region are selected as the research object.Based on the actual data of SVP(sound velocity profiler) as the reference standard,the score is made by using the sound velocity and SVP data calculated by Chen-Millero,Del-Grosso and Wilson empirical formulas for CTD data.The results show that the error of sound velocity calculated by Del-Grosso empirical formula is the smallest.In order to further improve the accuracy of sound velocity data,Del-Grosso formula is modified and verified by three other station data.It is found that the accuracy of sound velocity data calculated by the corrected formula is significantly improved,which provides a reference for other far-reaching sea areas to obtain high-precision sound velocity data by using CTD or other temperature,salt and depth data.