Determination of Persian Gulf water transport and oxygen utilization rates using SF6 as a novel transient tracer

Details Determination of Persian Gulf water transport and oxygen utilization rates using SF6 as a novel transient tracer Determination of Persian Gulf water transport and oxygen utilization rates using SF6 as a novel transient tracer

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..815l&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 5, p. 815-818

Physics

9

Oceanography: Physical: Hydrography, Oceanography: Physical: Upper Ocean Processes, Oceanography: Physical: Western Boundary Currents, Oceanography: Physical: Instruments And Techniques

Scientific paper

Sulphur hexafluoride (SF6) has potential as a transient tracer of recently ventilated water masses, as its atmospheric burden continues to increase. Northern Arabian Sea hydrography was examined using measurements of atmospheric and dissolved SF6, CFC-11, CFC-12 and CFC-113. Persian Gulf Water (PGW) was characterized by its SF6 signal, and the time elapsed since its formation was evaluated by two approaches. Four ventilation age estimates were derived from SF6/CFC-11, SF6/CFC-12, CFC-113/CFC-11 and CFC-113/CFC-12, and their agreement at the oceanic stations confirms the validity of SF6 as a transient tracer. A second approach, of correcting SF6 partial pressure for PGW dilution by an optimal mixing model and referencing to the atmospheric SF6 chronology, provided a relative tracer age. This indicated a PGW flow of 0.016 (+/-0.003) m/s across the northern Arabian Sea, with an associated oxygen consumption of 10.1 μmol/l p.a. that exceeds tracer-derived estimates but confirms rates derived from export flux.

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