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A temperature color mapping of the effects of a closed Bering Strait. The northern Pacific cools while the northern Atlantic warms significantly enough to bully Norther American climate.  (Source: Nature/UCAS)

The unassuming 53 mile Bering Strait hardly seems like the type of geological formation that would cause this kind of trouble.  (Source: Wikipedia commons)
It comes down to one little strait and some really big sheets of ice.

The Bering Strait, spanning a distance of approximately 53 miles between Alaska and Russia, looks like an unassuming place for temperature regulation for the entire North American region (including Greenland), but recently published NCAR/UCAR findings seem to indicate that it may be very geologically important.

The strait serves as a gate for cooler, less salinized water from the Pacific to flow to the warmer and saltier Atlantic. Their simulations found that without this flow, the climate of North America fluctuates much more rapidly – in the span of a few thousand years rather than some tens of thousands – and helps explain constant temperature and ice sheet modulation between 116,000 and 34,000 years ago, a time of constant ice sheet advance and retreat.

In the past, this pattern was often attributed to the Earth’s position along its 95,000 year orbital pattern, but the NCAR researchers found that when correlated with the temperature and ice data, the orbit could not explain the rapid fluctuations. Instead, it occurred to them that changes to the Bering Strait itself could have a large impact on the entire region due to the changes it would bring to the Pacific and Atlantic ocean currents. Their models indicate that a slight change in the strait would adversely affect the meridional overturning circulation, an ocean current which helps drive the Atlantic tropics-to-polar heat pump.

In the simulation, they show that around 110 to 115 thousand years ago, the northern climate cooled sufficiently to create giant ice sheets over the northern regions of North America and all of Greenland. As these ice sheets sucked up water from the global oceans, sea levels dropped by as much as 100 feet. Eventually a vast amount of the strait was no longer able to pass water – the average depth of the strait is 100 - 190 feet. The new land bridge cut off a vast portion of the ocean flow between the Pacific and Atlantic. This, in turn, caused the Pacific ocean to become even cooler and cleaner, but allowed the now saltier waters of the Atlantic to push the meridional overturning circulation into overdrive, warming the regional ocean, North America and Greenland by as much as 1.5C over a few thousand years.

Next, the regional warming caused the iced sheets to melt over another few thousand years, returning the oceans to their previous depth and reopening the Bering Strait. With the Atlantic’s access to cooler and cleaner water from the Pacific restored, the cycle started all over again.

These temperature oscillations went on like a driver overcompensating for an icy road fishtail until finally, around 34,000 years ago, the Earth’s distance from the sun was so great that it literally froze the fluctuation in place. About 10,000 years ago, the Earth had finally gotten close enough to the sun again to warm up the northern hemisphere to the point where the strait reopened slowly and the temperature variations settled into a much more docile animal.

This study helps to provide convincing data for two things: that a significant change in something even so geographically small can adversely affect the climate of an entire quadrant of hemisphere, if not an even greater area, and that the planet has its own regulatory devices to deal with such things. However, it remains to be seen how long the cycle would have gone on if not for the fortuitous position in the orbital cycle. Too, this study reflects nothing at all of man’s influence on these climate systems in current times. The key to understanding these things lies in first understanding the basic driving forces behind climate systems and the NCAR study has shown us how one such small system may operate.



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RE: Makes sense to me
By JediJeb on 1/12/2010 5:51:38 PM , Rating: 2
quote:
But that all supports the current theories of climate change. The buffers are getting full. Oceans are becoming more acidic as they absorb CO2 in the form of carbonic acid. Atmospheric CO2 as a percentage is way up in the last 150 years.


The problem with this though is that as the water in the ocean warms, it will absorb less CO2. If increased amounts of CO2 are causing global warming, then the oceans should be releasing vast amounts of CO2 into the atmosphere and becoming less acidic.

If the oceans are becoming more acidic and the temperatures are rising, then something other than CO2 must be causing the increase in acidity. But if increased CO2 absorbed in the ocean is causing the rise in acidity then the oceans must be cooling. It is a given fact that as the temperature of water rises that the partial pressure of the absorbed gasses above the water will increase which means the gasses are migrating from the liquid phase( ocean ) to the gasseous phase ( air ). This will happen with all gasses that are normally absorbed in the water. If the global temperatures are rising then we should see a rise in O2, CO2, N2, Ar, Methane, Water Vapor, and any other gasses in the air while at the same time they are falling in the oceans. To behave otherwise would mean that global warming has the power to over-ride the Laws of Thermodynamics and Solubility of Gasses. The only way to force more gasses into the water would be to increase atmospheric pressure, which I haven't seen reported.

Another problem I see is when people talk about burning fossil fuels releases stored carbon into the atmosphere. That is true, but most will make it sound as though it somehow increases the amount of carbon on the Earth. Conservation of Mass says that matter is neither created or destroyed in a chemical reaction. So the amount of carbon that is on the Earth today, should be equal to the amount of carbon that was on the Earth millions of years ago. If the change of CO2 in the atmosphere is what causes global temperature change, then before the carbon was captured by the plants and stored underground as fossil fuels, then the Earth must have been many times hotter in the past, or if not much hotter than now, we should be frozen in a global freezer now because of all the carbon that has been captured.

Water vapor is a much stronger green house gas than CO2, and if you want to test that do a simple experiment. Go outside just after sunset on a clear night and then again on a cloudy night and see which night the temperature falls the fastest. What you will find is that on a clear night the temperature will fall very quickly, yet on a cloudy night the temperature falls slowly. The reason is the water in the atmosphere works like a blanket. If CO2 was any where near as strong a greenhouse gas then since it has increased almost 50% in the last few hundred years we should be cooking by now.

Just my simple observations interpeted with my knowledge of chemistry and physics. Doesn't mean I'm right, but I have never seen it explained away either.


RE: Makes sense to me
By fofelix on 1/13/2010 12:27:06 PM , Rating: 2
Your argument sounds quite convincing , but I think there is a mistake in it.

You're right , that a higher temperature leads to worse solubility of any gasses in the water .
So at a constant C02 conc. in the atmosphere , rising temperature leads to higher C02 output of the oceans and thereby to less acidic oceans.

But we are measuring C02 conc. in ppm that means relative C02 conc. in the atmosphere.
So the solubility per Mol is worse at higher temperatures, but the acidity of the oceans is influenced by the relative C02 conc. --> the higher partial pressure of C02.
So acidity can increase together with the temperature and be caused by C02 solved in the ocean as carbon acid although the solubility of all gasses gets worse with higher temperature.
The oceans are not saturated yet. If it was, you would be right.
I hope you can see my point. English is not my mothertongue.

Auf Deutsch:
Es stimmt zwar, dass die Löslichkeit von sämtlichen Gasen bei steigender Temperatur sinkt. Allerdings gilt diese Aussage nur bei konstantem relativen Atmosphärenanteil dieses Gases. Durch einen höheren rel. Atmosphärenanteil steigt der Partialdruck des gesamten C02s und es löst sich absolut gesehen mehr C02, der Ozean wird saurer.
So kann steigende Temperatur mit saureren Ozeanen einhergehen, wenn man annimmt, dass die pH Änderung hauptsächlich durch C02 verursacht wird.
Wenn die Ozeane bereits gesättigt wären mit C02 würde mit der maximalen Aufnahmekapazität an CO2 zwangsläufig auch die gespeicherte Menge CO2 und damit die Azidizität nach unten gehen.

Greetings from Switzerland


RE: Makes sense to me
By JediJeb on 1/13/2010 5:42:24 PM , Rating: 2
Yes, that would be one variable that could drive the equilibrium into the aqueous phase. I will have to run some calculations to see how much affect a higher molar concentration would have on the partitioning between the gas and liquid phases.


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