Darelius, Elin; Smedsrud, Lars Henrik; Østerhus, Svein; Foldvik, Arne; Gammelsrød, Tor (2009): Relative phase shift and oscillation observations at moorings in the Filchner Depression area [dataset publication series]. Bjerknes Centre for Climate Research, PANGAEA, https://doi.org/10.1594/PANGAEA.808593, Supplement to: Darelius, E et al. (2009): Structure and variability of the Filchner overflow plume. Tellus Series A-Dynamic Meteorology and Oceanography, 61(3), 446-464, https://doi.org/10.1111/j.1600-0870.2009.00391.x
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Abstract:
Properties of the dense ice shelf water plume emerging from the Filchner Depression in the southwestern Weddell Sea are described, using available current meter records and CTD stations. A mean hydrography, based on more than 300 CTD stations gathered over 25 yr points to a cold, relatively thin and vertically well-defined plume east of the two ridges cross-cutting the continental slope about 60 km from the Filchner sill, whereas the dense bottom layer is warmer, more stratified and much thicker west of these ridges. The data partly confirm the three major pathways suggested earlier and agree with recent theories on topographic steering by submarine ridges. A surprisingly high mesoscale variability in the overflow region is documented and discussed. The variability is to a large extent due to three distinct oscillations (with periods of about 35 h, 3 and 6 d) seen in both temperature and velocity records on the slope. The oscillations are episodic, barotropic and have a horizontal scale of ~20-40 km across the slope. They are partly geographically separated, with the longer period being stronger on the lower part of the slope and the shorter on the upper part of the slope. Energy levels are lower west of the ridges, and in the Filchner Depression. The observations are discussed in relation to existing theories on eddies, commonly generated in plumes, and continental shelf waves.
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Coverage:
Median Latitude: -74.349632 * Median Longitude: -36.110859 * South-bound Latitude: -75.033300 * West-bound Longitude: -38.600000 * North-bound Latitude: -73.716670 * East-bound Longitude: -33.550000
Date/Time Start: 1998-01-22T13:00:00 * Date/Time End: 1999-02-23T13:00:00
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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2 datasets
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Datasets listed in this publication series
- Darelius, E; Smedsrud, LH; Østerhus, S et al. (2009): (Table 2) Observations of oscillations (O35, O3 and O6) at moorings in the Filchner Depression area. https://doi.org/10.1594/PANGAEA.808592
- Darelius, E; Smedsrud, LH; Østerhus, S et al. (2009): (Table 1) Relative phase shift at moorings F1, F2, F3 and F4 for different oscillations. https://doi.org/10.1594/PANGAEA.808591