evolution of the east greenland current from fram strait ... · powerpoint presentation author:...
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![Page 1: Evolution of the East Greenland Current from Fram Strait ... · PowerPoint Presentation Author: Lisbeth Håvik Created Date: 3/30/2016 2:51:57 PM](https://reader034.vdocuments.net/reader034/viewer/2022052006/601a31df39f78227c058b514/html5/thumbnails/1.jpg)
Evolution of the East Greenland Current from
Fram Strait to Denmark Strait: Synoptic
measurements from summer 2012
Lisbeth Håvik
Robert Pickart
Kjetil Våge
Agnieszka Beszczynska-Möller
Waldemar Walczowski
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The East Greenland Current
separated EGC
shelfbreak EGC
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Data
8 densely sampled
sections across the
EGC (August 2012).
CTD and velocity
measurements.
Lack velocity section 10.
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Data
3 sections from
IOPAS cruise
in northeastern
Nordic Seas
(July 2012).
CTD and
velocity
measurements.
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Water masses
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Kinematic structure
Absolute geostrophic velocities obtained by
referencing geostrophic velocities to the measured
velocities.
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Kinematic structure
Shelf break East Greenland Current
Polar Surface Water jet
Outer East Greenland Current
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Shelf break East Greenland Current
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Shelf break East Greenland Current
Reduced surface transport south of the JMFZ, how
does this affect freshwater transport?
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Freshwater transport
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Freshwater transport
Separated EGC ~35% of the FWT.
PSW jet ~40 % of the FWT.
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Outer EGC
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Outer EGC
NwAFC WSC
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Outer EGC
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Outer EGC
Hypothesis: A direct recirculation of the
Norwegian Atlantic Frontal Current in the Fram
Strait resulted in the outer EGC.
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Modification of Atlantic-origin water
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Modification of Atlantic-origin water
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Modification of Atlantic-origin water
Limited densification of the Atlantic-origin water
in the main core of the current along-stream.
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The East Greenland Current system
separated EGC shelfbreak EGC
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Summary
Three current cores detected in the EGC system:
• Shelf break EGC – Supply on average 2.2 Sv of
dense Atlantic-origin overflow water to the Denmark
Strait.
• PSW jet – carries ~ 40% of the FWT.
• Outer EGC - direct recirculation of NwAFC in Fram
Strait.
Atlantic-origin Water, and hence overflow water, is not
densified along-stream within the main current.
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