That I only partially understand. (I have some basic understanding of the science, but not an in-depth understanding.)
What do you make of this
http://www.whoi.edu/page.do?pid=7545&tid=282&cid=54366&ct=162">surprising finding?
Surprising Return of North Atlantic Circulation Pump
Sea Ice Decline May Actually Have Aided Ocean Overturning
One of the “pumps” contributing to the ocean’s global circulation suddenly switched on again last winter for the first time this decade, scientists reported Tuesday (Dec. 23) in Nature Geoscience. The finding surprised scientists, who had been wondering if global warming was inhibiting the pump—which, in turn, would cause other far-reaching climate changes.
The “pump” in question is the sinking of cold, dense water in the North Atlantic Ocean in the winter. It drives water down into the lower limb of what is often described as the Great Ocean Conveyor. To replace that down-flowing water, warm surface waters from the tropics are pulled northward along the Conveyor’s upper limb.
The phenomenon helps draw down the man-made buildup of carbon dioxide from air to surface waters and eventually into the depths, where the greenhouse gas can be stored for centuries and offset global warming. It also transports warm tropical waters northward, where the ocean transfers heat to the air and keeps winter climate in the North Atlantic region much warmer than it would be otherwise.
A research team led by Kjetil Våge and Robert Pickart of Woods Hole Oceanographic Institution examined new data collected by robotic floats that have been drifting for several years in the Labrador and Irminger Seas around southern Greenland. These Argo floats—part of a fleet of 3,000 dispatched since 2000 through the world’s oceans—descend to depths of 1.25 miles (2,000 meters), collect temperature and salinity data as they periodically rise toward the surface, and then transmit the data via satellite before descending again.