A new, automatic hydrothermal fluid sampler using a shape-memory alloy

Takeshi Naganuma, Masanori Kyo, Tatsuhiko Ueki, Kazuhiko Takeda, Jun Ichiro Ishibashi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A new hydrothermal fluid sampler has been developed to provide more maneuverability in underwater operation. The sampler characteristically employs a shape-memory alloy, which senses high temperature and actuates the suction mechanism. A shape-memory alloy is also used to switch the intake valve of the sampler, the intention being to avoid mis-sampling when the inlet in low temperature water. Prototype samplers were designed to collect the fluids hotter than 80°C. Test sampling was performed at hydrothermal vents to collect the fluids hotter than 80°C. Test sampling was performed at hydrothermal vents (1372-1374 m deep) in the submarine volcano, Suiyo Seamount, Izu-Bonin Arc, northwestern Pacific. Observed fluid temperature was between 138 and 298°C, while the ambient seawater temperature was 3.1 °C. Each prototype collected about 100 ml fluid as designed. The magnesium concentration in the samples indicated a seawater content of 47.5-90.8%, which indicates the entrainment of ambient seawater. Microscopic observation revealed the occurrence of microorganisms in the sample fluids at a population density of 105 to 106 cells ml-1, which is 2-3 orders of magnitude higher than those in seawater at that depth. The use of the newly developed fluid sampler will greatly facilitate the collection of vent-associated microorganisms, which are of potential biological and biotechnological interest.

Original languageEnglish
Pages (from-to)241-246
Number of pages6
JournalJournal of Oceanography
Volume54
Issue number3
DOIs
Publication statusPublished - Jun 1998

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hydrothermal fluid
sampler
fluid
seawater
hydrothermal vent
sampling
microorganism
submarine volcano
seamount
entrainment
suction
magnesium
population density
temperature
water

All Science Journal Classification (ASJC) codes

  • Oceanography

Cite this

A new, automatic hydrothermal fluid sampler using a shape-memory alloy. / Naganuma, Takeshi; Kyo, Masanori; Ueki, Tatsuhiko; Takeda, Kazuhiko; Ishibashi, Jun Ichiro.

In: Journal of Oceanography, Vol. 54, No. 3, 06.1998, p. 241-246.

Research output: Contribution to journalArticle

Naganuma, Takeshi ; Kyo, Masanori ; Ueki, Tatsuhiko ; Takeda, Kazuhiko ; Ishibashi, Jun Ichiro. / A new, automatic hydrothermal fluid sampler using a shape-memory alloy. In: Journal of Oceanography. 1998 ; Vol. 54, No. 3. pp. 241-246.
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