Abstract
The Arctic is part of the global climate system. To address the issue of climate, the fluxes of heat, salt, and fresh water must be considered. One of the most speculated reasons for rapid climate change in the subarctic North Atlantic, and the global conveyor belt, is a breakdown of the thermohaline circulation (THC) due to an increased fresh water supply. Whitehead’s (Estuaries 21:281–293, 1998) one-box dynamic model is used to show how multiple states and catastrophe can occur in the Arctic Mediterranean with variable freshening and cooling. The broader question is how this interacts with the global climate. In this chapter, we focus on the oceanic aspects of the arctic climate system, discuss processes, review the data, and speculate on the role this part of the globe has in the greater context of global climate. The interaction with the global system comprises the outflow of freshwater and ice, and deeper, freshened, and cooled seawater into the subarctic North Atlantic, via the Labrador Sea. An example of significant climate variability in the twentieth century is presented.
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- A :
-
Albedo
- G i :
-
Mode of convection
- M :
-
Advection term
- M a :
-
Atmospheric advection
- M o :
-
Ocean advection
- q T :
-
Cooling
- Q :
-
Ventilation of saline water in AM
- Q f :
-
Fresh water supply
- S :
-
Short wave radiation; Salinity
- S o :
-
Solar constant
- t :
-
Time
- T :
-
Temperature
- T 0 :
-
Surface air temperature
- U :
-
Outgoing long wave radiation
- z :
-
Vertical coordinate
- α :
-
Variation of density with temperature (pressure dependent)
- β :
-
Variation of density with salinity
- θ :
-
Potential (adiabatic) density
- ρ :
-
Density
- ρ o :
-
Reference density
- s:
-
Density anomaly (r – 1000 kg/m3)
- σ M :
-
RMS fluctuation in heat advection
- σ t :
-
Density anomaly ignoring pressure effects
- \( {\sigma }_{T}\) :
-
RMS fluctuation in air temperature
- ψ :
-
Local, temporal solar elevation
- AM:
-
Arctic Mediterranean
- AO:
-
Arctic Oscillation Index (SLP at North Pole)
- AW:
-
Atlantic Water
- BODC:
-
British Oceanographic Data Centre
- BSBW:
-
Barents Sea Branch Water
- ECHAM:
-
European Centre Hamburg Model (global climate model)
- EWG:
-
Environmental Working Group
- FSBW:
-
Fram Strait Branch Water
- GSR:
-
Greenland–Scotland Ridge
- MAIA:
-
Monitoring Atlantic Inflow toward the Arctic
- MOC:
-
Meridional Overturning Circulation
- NAO:
-
North Atlantic Oscillation Index (SLP at Lisbon – SLP at Reykjavik)
- NPR:
-
North Polar Region
- psu:
-
Practical salinity units (= ppt)
- PW:
-
Polar Water
- R/V:
-
Research vessel
- SAT:
-
Surface air temperature
- SLA:
-
Sea level anomaly
- SLP:
-
Sea level pressure
- Sv:
-
Sverdrups (= 106 m3/s)
- THC:
-
Thermohaline circulation
- TRACTOR:
-
TRAcer and Circulation in The NORdic Seas Region
- WSC:
-
West Spitsbergen Current
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McClimans, T.A., Alekseev, G.V., Johannessen, O.M., Miles, M.W. (2012). Interaction with the Global Climate System. In: Lemke, P., Jacobi, HW. (eds) Arctic Climate Change. Atmospheric and Oceanographic Sciences Library, vol 43. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-2027-5_6
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