Significant pressure excursions at Global Argentine Basin Flanking Subsurface Mooring (GA03FLMA)

News and updates on the 4 Global Arrays (Station Papa, Irminger Sea, Southern Ocean and Argentine Basin)

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FriedrichKnuth
Posts: 5
Joined: Mon Apr 24, 2017 6:43 pm

Thu May 25, 2017 7:22 pm

It appears that the Global Argentine Basin Flanking Subsurface Mooring (GA03FLMA) was periodically dragged several 100 meters downward, then returned back to its original depth.

Site location 42.51°S, 42.89°W
Water depth 5,200 meters

CTD depths
GA03FLMA-RIM01-02-CTDMOG040 - 26 m
GA03FLMA-RIM01-02-CTDMOG041 - 32 m
GA03FLMA-RIM01-02-CTDMOG042 - 52 m
GA03FLMA-RIM01-02-CTDMOG043 - 82 m
GA03FLMA-RIM01-02-CTDMOG044 - 122 m
GA03FLMA-RIM01-02-CTDMOG045 - 172 m
GA03FLMA-RIM01-02-CTDMOG046 - 242 m
GA03FLMA-RIM01-02-CTDMOG047 - 342 m
GA03FLMA-RIM01-02-CTDMOG048 - 495 m
GA03FLMA-RIM01-02-CTDMOH049 - 740 m
GA03FLMA-RIM01-02-CTDMOH050 - 991 m
GA03FLMA-RIM01-02-CTDMOH051 - 1492 m
argentine_flanking.png
argentine_flanking.png (65.43 KiB) Viewed 176 times
GlobalArgentine.png
GlobalArgentine.png (985.44 KiB) Viewed 176 times

FriedrichKnuth
Posts: 5
Joined: Mon Apr 24, 2017 6:43 pm

Thu May 25, 2017 7:24 pm

Deployment 2 of all CTDs shows two larger (200 - 500 m) and multiple smaller, but significant pressure variations. See salinity and temperature plots from all CTDs below, with pressure on the y and time on the x axis. (Note that the color scale is not fixed, but scales with the data range of each new plot.) One speculation is that eddy rings in the region may cause these excursions. WHOI is investigating why this may have happened.
GA03FLMA.jpg
GA03FLMA.jpg (3.6 MiB) Viewed 175 times

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