Although the flows are vastly more complex than I make out — the vast area
of warmer surface water warms the atmosphere.
I think the scientific community generally agrees that the intensity of these hurricanes has really been enhanced
by warming surface waters, caused by global warming.
In normal, non-El Niño conditions, Pacific trade winds near the equator blow from east to west, moving
warm surface water with them.
As an ice cap formed at the North Pole, freshly cooled water would sink to the bottom of the ocean and then rise again where winds
pushed warm surface waters away from the coasts in a seasonal phenomenon known as upwelling.
Sea level on the West coast may begin to rise due to climate regime shift
as warm surface waters return to the Pacific Read More
It looks at the Atlantic meridional overturning circulation, which distributes heat as it
moves warmer surface water from the tropics toward Greenland and the high northern latitudes and carries colder, deeper water from the North Atlantic southward.
Thermohaline circulation also
drives warmer surface waters poleward from the subtropics, which moderates the climate of Iceland and other coastal areas of Europe.
They flush the cooled surface waters down into the ocean depths, part of a giant conveyor belt that brings
more warm surface water into the far north.
The Pentagon report describes a scenario in which human - caused global warming leads to a near - term collapse of the ocean's thermohaline circulation, which
brings warm surface waters from the tropics to the North Atlantic, warming parts of Western Europe.
Large, persistent high - pressure cells in the North East Pacific and South East Pacific drive winds which push
warm surface waters west, and pile them up in the West Pacific.
It is apparently driven by the acceleration and slowing of the great ocean conveyor that carries
warm surface water into the northern North Atlantic (Science, 1 July 2005, p. 41).
Turbulent deep ocean flows surface and set up wind and current responses that again extend the cold tongue and piles
warm surface water up against Australia and Indonesia.
The opposite occurred in 1997 and 1998,
when warm surface waters in the Pacific Ocean brought about by El Niño pushed rainfall systems north, leaving parts of the southern and eastern Amazon forest dry and prone to fires.
This raises the thermocline (boundary
between warm surface water and cold deep water), and increases the amount of heat stored in the upper few hundred meters of the ocean.
The Atlantic Meridional Overturning Circulation (AMOC)-- characterized by
warm surface waters flowing northward and cold deep waters flowing southward throughout the Atlantic basin — is defined as the zonal integral of the northward mass flux at a particular latitude.
This process is essential for the Atlantic Meridional Overturning Circulation, or AMOC, one of the «engines» of our ocean's thermohaline circulation, which in the Atlantic is best known for one of its components: the Gulf Stream, which
transports warm surface waters from the Gulf of Mexico all the way towards the Norwegian coast and the southern fringes of the Arctic Ocean.
This system involves the sinking of cold saline waters in the subpolar regions of the oceans, an action that helps to drive
warmer surface waters poleward from the subtropics.
Organisms that have evolved in environments that have little if any change in environmental conditions, for example, may not be able to adapt well if currents increasingly
mix warm surface waters down to the seafloor.
upwelling A process that draws deep salty water that is rich in nutrients up to the ocean surface,
replacing warmer surface waters that have been pushed offshore by winds.
Consider that just moving some of the
already warmer surface water to depth (while some upwelling of colder water occurs elsewhere as a compensation) results in an increasing heat content at depths while * simultaneously * producing a decrease in heat content at the surface.
In the Atlantic Ocean, the current known as the Atlantic Meridional Overturning Circulation (AMOC) ferries
warm surface waters northward — where the heat is released into the atmosphere — and carries cold water south in the deeper ocean layers, according to the National Oceanic and Atmospheric Administration.
However, in their wake, hurricanes set up large - amplitude waves that
mingle warm surface water with colder deep water, says climate scientist Matthew Huber of Purdue University.
With an El Niño now under way —
meaning warm surface waters in the Pacific are releasing heat into the atmosphere — and predicted to intensify, it looks as if the global average surface temperature could jump by around 0.1 °C in just one year.
Shoreside, Navy scientists are experimenting with wave power at Hawaii's Kaneohe Bay Marine Corps base and exploring a promising new technology called ocean thermal energy conversion (OTEC), which
uses warm surface water to heat a liquid with a very low boiling point, such as ammonia.
One result is a flow of cold deep water toward the equator and
warm surface water toward the poles, and this «overturning circulation» plays a crucial role in moving heat around the globe.
The North Atlantic is a critical point,
where warm surface water coming from the tropics on the Gulf Stream is cooled and becomes denser.
With lots of
warm surface water releasing heat into the atmosphere, in addition to ever - rising levels of greenhouse gases, 2015 is likely to surpass the warmest year on record, and 2016 will be similarly hot.
The deep circulation that drives
warm surface waters north is weakening, leading to a cooling of the north Atlantic relative to the rest of the oceans.
It is interesting to note that the AMO explanation still relied
on warmer surface waters as the root cause of hurricane intensification.