Now that we know much more than we did
about ocean circulation patterns, intermixing and the like (although there is still much to learn) we need to get this message across in much simpler fashion than we have done so far.
Not exact matches
The results provide new information
about the significant dispersion
patterns currently un-accounted for in
ocean circulation models, according to the authors.
Alley is talking mainly
about D / O events and, like some others (Broecker for instance) tried to link it to the LIA, but neither the
pattern of change, the abruptness, the
ocean circulation change nor the magnitude actually match.
There are continuing major questions
about the future of the great ice sheets of Greenland and West Antarctica; the thawing of vast deposits of frozen methane; changes in the
circulation patterns of the North Atlantic; the potential for runaway warming; and the impacts of
ocean carbonization and acidification.
There is so little understanding
about how the
ocean parses its response to forcings by 1) suppressing (local convective scale) deep water formation where excessive warming
patterns are changed, 2) enhancing (local convective scale) deep water formation where the changed excessive warming
patterns are co-located with increased evaporation and increased salinity, and 3) shifting favored deep water formation locations as a result of a) shifted
patterns of enhanced warming, b) shifted
patterns of enhanced salinity and c) shifted
patterns of
circulation which transport these enhanced
ocean features to critically altered destinations.
There is also a natural variability of the climate system (
about a zero reference point) that produces El Nino and La Nina effects arising from changes in
ocean circulation patterns that can make the global temperature increase or decrease, over and above the global warming due to CO2.
It's all
about circulation patterns in the
ocean.
I was formerly somewhat skeptical
about the notion that the
ocean «conveyor belt»
circulation pattern could weaken abruptly in response to global warming.
Explanations evoking
ocean and atmospheric
circulation patterns radically different from today have been proposed to explain the climate of the mid-Cretaceous; however, there is no scientific consensus on how the Mid-Cretaceous warm climate came
about (source: NOAA Paleo Climatology program).