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A tracer study of ventilation in the Japan/East Sea

Record type: Article

During the Circulation Research in East Asian Marginal Seas (CREAMS) summer cruises in 1999, a suite of samples was collected for tracer analysis. Oxygen isotopes combined with tritium-helium ventilation timescales and noble gas measurements give unique insights into the ventilation of water masses in the Japan/East Sea (JES). In particular, noble gases and oxygen isotopes are indicators of brine rejection, which may assist in explaining the recent changes observed in the ventilation of the JES. Oxygen isotope data presented here indicate that both thermally driven convection and brine rejection have played significant roles in deep-water formation but that brine rejection is unlikely to be a significant contributor at the moment. A 6-box ventilation model of the JES, calibrated with tritium and helium-3 measurements, performed better when a significant decrease of dense-water formation rates in the mid-1960s was incorporated. However, the model calculations suggest that Japan Sea Intermediate Water formation is still occurring. Subduction of sea–ice melt water may be a significant ventilation mechanism for this water mass, based on an argon saturation minimum at the recently ventilated salinity minimum in the northwestern sector of the JES. The salinity and oxygen isotope budgets imply a potential bottom-water formation rate of 3.97±0.89×1012 m3 yr?1 due to brine rejection, which could account for a time averaged fraction of between 25% and 35% of the ventilation of subsurface water formation in the JES.

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Citation

Postlethwaite, C.F., Rohling, E.J., Jenkins, W.J. and Walker, C.F. (2005) A tracer study of ventilation in the Japan/East Sea Deep Sea Research Part II: Topical Studies in Oceanography, 52, (11-13), pp. 1684-1704. (doi:10.1016/j.dsr2.2004.07.032).

More information

Published date: 2005
Organisations: National Oceanography Centre

Identifiers

Local EPrints ID: 17481
URI: http://eprints.soton.ac.uk/id/eprint/17481
ISSN: 0967-0645
PURE UUID: 1c96379b-fe37-4333-bde7-a0deea01216b
ORCID for E.J. Rohling: ORCID iD orcid.org/0000-0001-5349-2158

Catalogue record

Date deposited: 03 Oct 2005
Last modified: 17 Jul 2017 16:38

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Contributors

Author: C.F. Postlethwaite
Author: E.J. Rohling ORCID iD
Author: W.J. Jenkins
Author: C.F. Walker

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