Further correcting pressure effects on SBE911 CTD-conductivity data from hadal depths
Further correcting pressure effects on SBE911 CTD-conductivity data from hadal depths
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DOI：
10.1007/s10872-020-00565-3
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发表时间：
2020-09
影响因子：
2.3
通讯作者：
H. van Haren;H. Uchida;D. Yanagimoto
中科院分区：
文献类型：
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作者：
H. van Haren;H. Uchida;D. Yanagimoto
海达尔，> 6000米深船载海鸟电子公司SBE 911 plus电导率温度深度（CTD）数据是使用两个不同的系统在地球最深点附近获得的，在马里亚纳海沟的挑战者深渊，相隔14年。在7000 m以下的极弱密度分层沃茨中，两组盐度数据显示，随着深度的增加，盐度人为增加了约10- 6 g kg− 1 m − 1，SBE对电导率数据的线性压力校正未涵盖这一点。利用独立水样资料进行了盐度校正，并提出了电导率资料压力校正的附加算法。校正后的盐度数据仍然随着深度的增加而微弱地增加，同时温度降低，这可能表明密集的改性南极底层水的涌入。修正后的密度随深度的变化用于计算深层湍流值。
Hadal, > 6000 m deep shipborne Sea-Bird Electronics SBE 911plus Conductivity Temperature Depth (CTD) data are obtained using two different systems in the vicinity of the Earth’s deepest point, in the Challenger Deep, Mariana Trench 14 years apart. Below 7000 m in very weakly density stratified waters, the salinity data from both sets show an artificial increase with depth of about 10–6g kg−1m−1that is not covered by the SBE linear pressure correction to the conductivity data. With the aid of independent water sample data, salinity is corrected and an additional algorithm for the pressure correction on conductivity data is formulated. The corrected salinity data still weakly increase with depth, together with a decrease in temperature, which may point at an influx of dense modified Antarctic bottom water. The corrected density variations with depth are used in calculations of deep turbulence values.