4.5 Article

Collection sediment from Mariana Trench with a novel pressure-retaining sampler

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.dsr.2022.103740

Keywords

Hadal trenches; Sediment; Pressure-retaining; In-situ trial; Novel mechanism

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Funding

  1. Ministry of Science and Technology of the People's Republic of China [SQ2018YFC0310601]
  2. Strategic Priority Research Program of the Chinese Academy of Science [XDA22000000]
  3. National Key Research and Development plan for China [2016YFC0300800, 2017YFC006500]
  4. Key Program of Sanya yazhouwan Technology City [SKJC-2021-01001]
  5. Institution of Deep Sea Technology Innovation, Chinese Academy of Science

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A pressure-retaining sampler was developed for hadal trenches, displaying excellent pressure-resistance and sampling performance during field tests in the Mariana Trench.
Sediments in the hadal trenches have been proved to contain a large number of specific microorganisms. In this study, we developed a pressure-retaining sampler for the hadal trenches. A novel piston sampling mechanism was designed, the weight of which is light enough to be mounted on a lander for field tests. Furthermore, laboratory tests validated its high-pressure resistance and pressure-retaining performance. We tested the penetration force and the sampling performance in different clays. Moreover, a pressure compensator was designed based on the actual gas state under high pressure. Finally, a prototype of the sampler was built and field tested in the Mariana Trench. The results indicated that the sampler has an excellent pressure-retaining capacity and can collect sediment samples at the deepest point of the in the world's ocean.

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