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Successful field tests of the new sampler were also carried out in five hydrothermal fields, two in Indian Ocean, and three in Okinawa Trough (max. Routine laboratory-based pressure tests proved that it is suitable for operation up to 35 MPa pressure.
PESTER ROV UPGRADE
This new sampler, named WHATS-3, is a new addition to the WHATS-series samplers and a major upgrade from the previous WHATS-2 sampler with improvements in sample number, valve operational time, physical robustness, and ease of maintenance. Here, the development of a new flow-through, pressure-tight fluid sampler capable of four independent sampling events (two subsamples for liquid and gas analyses from each) is reported. To accurately assess fluid and gas properties of deep-sea geofluids, well-designed pressure-tight fluid samplers are indispensable and as such they are important assets of deep-sea geofluid research. Fluid chemistry, especially, provides crucial information toward elucidating the physical, chemical, and biological processes that occur in these ecosystems. 6Department of Earth Sciences (D-ERDW), Institute of Geochemistry and Petrology, ETH Zürich, Zürich, Switzerlandĭeep-sea geofluid systems, such as hydrothermal vents and cold seeps, are key to understanding subseafloor environments of Earth.5Section 4, R&D Department, NiGK Corporation, Kawagoe, Japan.4Department of Earth and Planetary Sciences, Graduate School of Science, Kyushu University, Fukuoka, Japan.3Project Team for Development of New-generation Research Protocol for Submarine Resources, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan.2Research and Development Center for Submarine Resources, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan.1Department of Subsurface Geobiological Analysis and Research (D-SUGAR), Japan Agency for Marine-Earth Science and Technology, Yokosuka, Japan.Junichi Miyazaki 1,2,3, Akiko Makabe 3, Yohei Matsui 2,3, Naoya Ebina 2,4, Saki Tsutsumi 2,4, Jun-ichiro Ishibashi 2,4, Chong Chen 1, Sho Kaneko 5, Ken Takai 1,2,3 and Shinsuke Kawagucci 1,2,3,6 *