Persian Gulf Water filaments inject oxygenated, saline water into the Bay of Bengal oxygen minimum zone

Wednesday 13 November 2019 - 13:30 to 14:30
Other venue (see below for details).
Other Venue: 
054/06 John Swallow Room
Dr. Peter Sheehan (UEA, Norwich)


Persian Gulf Water (PGW) is an oxygenated, high-salinity water mass that could act to ventilate the BoB oxygen minimum zone (OMZ). Little is known about when and where PGW is transported to the BoB. Ocean glider observations demonstrate the presence of PGW in the southwestern BoB. Output from NEMO re-analysis shows this PGW signal is associated with a northward-flowing filament of high-salinity water. Particle tracking experiments reveal two pathways: one in the eastern and another in the western Arabian Sea. Both connect to the BoB via equatorial currents. The greatest influx of PGW occurs between 82 and 87E. There is no pronounced seasonal cycle in the PGW flux into the BoB. We propose that injection of PGW to the BoB OMZ prevents oxygen concentrations in the BoB falling as low as concentrations in the Arabian Sea OMZ, and keeps concentrations above the level at which de-nitrifications occurs.

Please note the venue  (054/06 John Swallow Room) is not the usual room.



Seminar category: 
POC seminars