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Transpolar Drift

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Transpolar Drift By: Danielle Holden Background Moves from Siberian Coast of Russia through Fram Strait and joins the Eastern Greenland Current Moves at 1-3 cm/s ... – PowerPoint PPT presentation

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Title: Transpolar Drift


1
Transpolar Drift
  • By Danielle Holden

2
Background
  • Moves from Siberian Coast of Russia through Fram
    Strait and joins the Eastern Greenland Current
  • Moves at 1-3 cm/s
  • Depth 2000 m

Arctic Ocean circulation. Image courtesy of
Arctic Monitoring and Assessment Programme
(AMAP), Figure 3.29, AMAP (1998).
3
Ice/Fresh Water Circulation
  • Beaufort Gyre and Transpolar Drift exchange ice
    between each other
  • The amount of fresh water transported depends on
    how much ice was melted in the Arctic
  • 50-70 albedo in Arctic
  • Sensible heat loss into air and ocean
  • Transpolar Drift collides ice into Greenland
    coast ridge formation and thick ice

The amount of ice export Source Torben Königk et
al Fram Strait Ice Export Variability and its
Impact on Climate
4
Circulation and NAO
  • Positive and Negative Phases affect the
    Transpolar Drift differently
  • Positive phase creates westerlies in Arctic,
    colder air more sea ice, less ice and water
    transport
  • Negative phase weak winds in Arctic, warmer air,
    less sea ice, more ice and water transport

5
Circulation and Vorticity
  • Decadal Oscillations between () and (-)
    vorticities
  • Positive and Negative vorticities affect where
    the current travels. There are 2 paths.
  • Positive Vorticity Phase Weak High Pressure in
    Arctic allows fresh water/sea ice to drift
    counterclockwise. (RED)
  • Negative Vorticity Phase Strong High Pressure
    forces fresh water clockwise (BLUE)

Transpolar Drift Paths Source Mysak Patterns
of Arctic Circulation
6
References
  • http//www.giub.unibe.ch/klimet/wanner/nao.html
  • http//nsidc.org/seaice/processes/circulation.html
  • Knauss, John A. Introduction to Physical
    Oceanography. Long Grove Waveland Pr Inc, 2005.
  • Koenigk, T., J. Jungclaus, and U. Mikolajewicz.
    "Fram Strait Ice Export Variability and its
    Impact on Climate." American Geohysical Union
    (2004).
  • Mysak, Lawrence A. "Patterns of Arctic
    Circulation." Science 293 (2001) 1269-270.
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