The development of the Antarctic Circumpolar Current forever altered the carbon biological pump by increasing upwelling in the southern oceans, and later along continental west coasts by
cooling upwelled waters.
(
That cooler upwelled water is then warmed by the La Niña - caused additional sunlight as it travels from east to west across the tropical Pacific, and it collects in an area east of Indonesia called the west Pacific Warm Pool, where it warms the ocean heat content of the tropical Pacific.)
Not exact matches
Coastal
upwelling in the Southern Hemisphere results in
cool waters as far north as the equator in the Pacific, driving the whales all the way to Panama and Costa Rica for the southern winter.
In the northern Mozambique channel and the Raja Ampat archipelago in Indonesia, for instance,
upwelling and ocean gyres bring
cool water that has allowed fragile corals to escape bleaching.
This change reduces the
upwelling of
cool subsurface
water and cuts off the supply of nutrient - rich cold
water upwelling from below.
The
upwelling of plankton rich
cooler water at this deeper site means it is a good place for larger pelagics.
The
cool nutrient - rich
waters of the north Pacific are able to provide kelp forests with millions of plankton - the base of the aquatic food chain — due to an
upwelling of
water from the deep sea in the stormy, winter months.
Feeding The Cassin's auklet feeds offshore, often relying on
upwellings of
cooler nutrient rich
waters and associating with bathymetric landmarks such the continental shelf and underwater canyons.
It's in the summer months, late summer months, say July, August, September when
water conditions to around Nusa Penida and in fact to the south of that strip of Indonesia that borders the Indian Ocean, there's an
upwelling which makes the
waters in the shallows much
cooler than normal and the Mola mola tend to follow the
upwelling into the shallows and it's then the divers can see them.
In general, the regions of expanding warming
upwelling water in the Indian Ocean, North Pacific, or wherever they are, must create slight bulges in the surface, and the regions of shrinking,
cooling, sinking
water in the Arctic must create slight depressions in the sea surface (again, I mean in a very low pass sense — obviously storms, tides, etc, create all kinds of short - terms signals obscuring this).
The picture I gave neglects the effect of ocean dynamics —
cooling by
upwelled water entering the mixed layer and warming by imported warm
water from the side.
When
upwelling brings cold
water to the ocean's surface,
cooling the atmosphere, where is that heat lost from the atmosphere «hiding»?
Consenquently, the associated SST pattern is slightly
cooler in the deep convection
upwelling regions of the Equitorial Pacific and the Indian Ocean, strongly
cooler in the nearest deep convection source region of the South Atlantic near Africa and the Equator, warm over the bulk of the North Atlantic, strongly warmer where the gulf stream loses the largest portion of its heat near 50N 25W, and strongly
cooler near 45N 45W, which turns out to be a back - eddy of the Gulf Stream with increased transport of cold
water from the north whenever the Gulf Stream is running quickly.
Even in a time of global warming, an increase in ice sheet melting or deep
water upwelling can
cool the atmosphere relative to the long term trend.
There is also less
upwelling of
cool water from below the surface when the trade winds weaken.
Between 2 and 3 million years ago the
cooling of the deep oceans reached a tipping point, and modern
upwelling regions ogf cold deep
water off the coast of Peru, California and the west coast of Africa were established.
But now
upwelled subsurface
waters were
cooler by 4 to 9 °C.
Today we witness global warming from heat ventilation during an El Nino and global
cooling due to increased
upwelling of
cooler waters during La Ninas.
After 30 + million years of
cooling, 2 to 3 million years ago, colder ocean
waters eventually
upwelled in the mid latitudes along the west coasts of major continents as well as along the equator.
A
cooler surface facilitates
upwelling of
cool and nutrient rich abyssal
water and vice versa.
Periodically, parts of the south coast experience local, wind - driven
upwelling of
cool bottom
water, while the fast flow of the current itself drives
upwelling of deep
waters, where the shelf widens to form the Agulhas Bank [11].
The persistent
upwelling of cold
water in the eastern tropical Pacific would have reduced cloud cover there, via reduced oceanic evaporation, and thus allowed more of the sun's energy to enter the tropical ocean - this would have aided the ocean warming process, as generally the case when the tropical ocean is
cooler - than - normal.
• surface
upwelling (of cold /
cool water) at / off western continental margins, driven by Coriolis effect on equatorward currents;
Upwelling of cold deep
water continues to feed the
cool pool, which grows, frequently reaching the West coast of S. America.
Upwelled CDW
water can be
cooled when modified by winter
water, or remain warm when it directly accesses a glacier grounding point.
The planetary
cooling from the mid 1940's was most clearly associated with a shift in the Pacific Ocean to more cold
water upwelling in eastern Pacific.
A
cool PDO and a La Niña are the result of cold and carbon dioxide and nutrient rich
water from the oceanic abyss
upwelling on the eastern Pacific margin.
This is because of the
upwelling of
cool water in their wake.
When these
cooler waters spread far and wide due to more
upwelling, easterlies increase, signalling the start of La Nina.
The
waters of the
upwelling zone off of Peru and Chile are always up to 8DegC
cooler than
waters to the West, causing easterly winds.
Recently, there appears to have been more
cool water than normal associated with the
upwelling (
cool) Kelvin waves, so we've had the double - dip (2010/11 La Niña and 2011/12 La Niña) and now La Niña conditions — though I don't know that we could classify this as a triple - dip, since we did reach strong El Niño conditions for a short period of time during 2012.
«We suspect these reefs are partially protected from heat stress by
upwelling of
cooler water from the Coral Sea.»
Off the west coasts of the American continents in the trade - wind belts,
upwelling of cold subsurface
water causes the overlying air to be
cooled below its dew point (the air temperature below which
water vapour condenses as dew), with the consequent widespread formation of low, thick clouds.
Some of the flow continues around South Africa as narrow (50 km or 30 mi wide) filaments that
cool rapidly and mix with the surrounding
waters in the large
upwelling zone off Africa's Namibia coast.
«For those not in the know» La Nina is the direct consequence of the return of trade winds to their normal strength after a Nino so that renewed surface wind stress plus the Coriolis effect generate
upwelling of
cool water along the equatorial region: go read it up in any decent, old - fashioned text - book on physical oceanography published after about 1970....
A warm band of relatively constant temperature (18 - 22 °C) and salinity (36.0 - 36.2 psu) is observed near the bottom year - round just inshore of the shelf break, bounded by seasonally variable
waters on the inshore side, and by fluctuating
waters subject to
cool -
water upwelling events and warm Gulf Stream intrusions on the offshore side.
Organisms living in areas where
upwelling of
cool, low pH
water occurs (e.g. Eastern Pacific and Baltic Sea) may be acclimatized / adapted to acidification [31 — 34], whereas those living in areas with strong warming (e.g. Eastern Australia) may be acclimatized / adapted to increased temperature [7,35].
For the PDO it is better to see it as deep
upwelling cold
water spreading westwards through the upper layer,
cooling it relative to the deeper layer.
That's because the
upwelling of cold
water associated with La Nina episodes or the
cool phase of the PDO, for instance, delay the Planck response to an increase in external forcing and hence help maintain the TOA imbalance and help drive the ocean heat gain.
Reduced equatorial cloud cover during La Nina (due to the
cooler sea surface temperature), combined with the strong
upwelling (Ekman suction) in the eastern equatorial Pacific, does indeed lead to greater warming of the ocean - because it's bringing
cool subsurface
water to the surface, where it can be heated by the sun.
They explain the lesser warming in the East Pacific Ocean, near South America, as being due to the fact this region is kept
cool by
upwelling, rising of deeper colder
water to shallower depths.