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The IAOOS Seaglider Project. A few notes for the OPNet meeting, May 27-28, 2009 prepared by F. Høydalsvik, met.no. Project participants: F. Høydalsvik, C. Mauritzen, C. Lee, J. Gobat, and K.A. Orvik. Ocean Weather Station Mike (OWSM) (10 km range circle).

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the iaoos seaglider project

The IAOOS Seaglider Project

A few notes for the OPNet meeting, May 27-28, 2009 prepared by F. Høydalsvik, met.no

Project participants: F. Høydalsvik, C. Mauritzen, C. Lee, J. Gobat, and K.A. Orvik

slide2

Ocean Weather Station Mike (OWSM)(10 km range circle)

Red line: Seaglider SG-017 OWSM Section (Summer/Autumn 2008).

Yellow line: Seaglider SG-160. The Svinøy Section. Ongoing, deployed January 24, 2009.

slide3

SG-160

Depth-averaged currents

Feb 10 – Mar 7, 2009

slide4

Along-track hydrography

35

Salinity

Temperature

Note the very small stratification during winter

Pot. density

seaglider operations
Seaglider operations
  • Seaglider SG-017: Zonal transects at 66 °N between the shelf break and 1°W, passing through the OWSM area. July-November 2008
  • SG-160: Currently operating at the Svinøy Section (deployed January 24, 2009)
  • The western branch of the NAC is the part most difficult to monitor by using traditional methods (Orvik et al, 2001).
  • The glider is more comfortable in the deep sea, spends less energy.
  • We focus on the part of the NAC west of the slope (900 m or deeper).
  • The slope current or eastern branch of the NAC is being monitored using current meters.
seaglider operations1
Seaglider operations
  • Successful operation in rough weather in the open sea, yielding data traditionally not captured
  • High data density. Hydrography, [O2], fluorescence, red & blue backscatter.
  • Typical dive: 4-6 km horizontal distance, down to 1000 m. Vertical profiles obtained by interpolation.
  • Long distances can be covered. Near-synoptic transects impossible.
  • High-frequency variations are “smoothed out”. With very large variations (e.g., 14 Sv in the eastern branch on a 25 h time scale, Orvik et al, 2001)
  • A ship transect with VM-ADCP does not necessarily give a better representation of the current than a glider transect of roughly three weeks duration.
slide7

SST from satellite data(Jan-Mar 2009, provided by S. Eastwood) & SG-160 tracks. Black, thick line is 4.8°C. The traditional Svinøy Section stops at 64°40’N, 0°E.

slide8

(A)

(B)

(C)

(D)

Absolute geostrophic velocities/volume transport. (A) From direct integration of thermal wind eqs. (B) Smoothed using a 12-dive running mean. (C) Transport per length unit. Dashed line: Transport from the smoothed field. (D) Max. diving depth / bathymetry

slide9
Conclusions so far:
    • The NAC has dominating current cores, with large velocities, but the transport outside the cores is significant.
    • We find recirculation cells, a continuously meandering front, and eddies, but no sign of a large-scale, permanent recirculation between the western and eastern branch. This is consistent with drifter data (e.g. Jakobsen et al, 2003; Inga Coszalka, pers. comm.)
    • The transports we find are somewhat larger than those found assuming negligible barotropic / deep water velocities in the area.