"You take the blue pill and the story ends. You wake in your bed and you believe whatever you want to believe."
"You take the red pill and
you stay in Wonderland and I'll show you how deep the
rabbit-hole goes."
Vital Climate Graphics :
Potential Impacts
of Climate Change
Next: Potential impact
of sea-level rise on Bangladesh
30. The global conveyor belt thermohaline circulation is driven
primarily by the formation and sinking of deep water (from around
1500m to the Antarctic bottom water overlying the bottom of the ocean)
in the Norwegian Sea. This circulation is thought to be responsible
for the large flow of upper ocean water from the tropical Pacific to
the Indian Ocean through the Indonesian Archipelogo. The two
counteracting forcings operating in the North Atlantic control the
conveyor belt circulation: (1) the thermal forcing (high-latitude
cooling and the low-latitude heating) which drives a polar southward
flow; and (2) haline forcing (net high-latitude freshwater gain and
low-latitude evaporation) which moves in the opposite direction. In
today's Atlantic the thermal forcing dominates, hence, the flow of
upper current from south to north.
When the strength of the haline forcing increases due to excess
precipitation, runoff, or ice melt the conveyor belt will weaken or
even shut down. The variability in the strength of the conveyor belt
will lead to climate change in Europe and it could also influence in
other areas of the global ocean. The North Atlantic atmosphere-ocean-cryosphere
system appears to have natural cycles of many timescales in switching
the conveyor belt. Periodic movement of excessive ice from the Arctic
into the Greenland Sea appears to be responsible for the interdecadal
variability of the conveyor belt. There is no evidence yet that the
influx of interdecadal switching extends beyond the North Atlantic
Ocean. .
Next: Potential impact
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Vital Climate Graphics :
Potential Impacts
of Climate Change
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