Posted on 03/06/2016 6:41:39 PM PST by JimSEA
Global climate patterns have undergone a remarkable shift in the past 600,000 to 1.2 million years. Before the transition, glacial cycles, consisting of cold ice ages and milder interludes, typically lasted about 40,000 years—but those weaker cycles gave way to longer-lasting icy eras with cycles lasting roughly 100,000 years. In between the cold ice ages are periods of thawing and warming known as interglacial periods, during which sea levels rise and ice retreats. Here Past Interglacials Working Group of PAGES identifies and compares interglacial periods over the past 800,000 years, including our current era.
Glacial periods give way to interglacials on some occasions when the Northern Hemisphere’s summer solar insolation (the amount of solar radiation received by Earth’s surface) increases alongside corresponding decreases in ice volume and increases in temperature and atmospheric carbon dioxide (CO2). Although the end of an interglacial period is a slow process requiring the sequential reversal of these conditions, the onset of an interglacial period can be relatively fast. Within the glacial periods, there are secondary fluctuations. These are known as interstadial and stadial periods, which occur when glaciers retreat and advance, respectively.
The authors predict that this current interglacial period won’t give way to a glacial period for another 50,000 years or so. The only way the current interglacial could end earlier is if CO2 levels were reduced to well below preindustrial levels
(Excerpt) Read more at eos.org ...
good article here:]
http://solarcycle24com.proboards.com/thread/2403/global-cooling-nears-2017-2053
Ok. I’ve been thinking of buying Archibald’s book.
Guess I’ve been talked into it.
>>>But either way cyclically increasing co2 levels seem to be a natural thing in the environment
Agree, yet to find the scientific community tagging of CO2 owned by humanity versus mother nature.
If you will, it’s not that simple. Rising temperatures can be both a cause and a result of climate warming. Also, it might be a result of increased volcanism. Personally I feel that the key triggers are plate tectonics and most importantly solar output. However the man lesson seems to be that you can’t look at one thing in isolation. I haven’t even mentioned ocean currents and the are influential.
Bump for after coffee.
Chuckles, that and auto spell check.
Ocean currents are actually very important, as you state. The flow or flux of energy is far more important then temperature readings. Especially atmospheric temperatures which represent very minor proportions of the total energy flux. Apes holding thermometers have no clue what they are doing. If there was no water current and all Oceans were stagnant, the equatorial surface layers would be very warm and the deeper and polar regions very cold. Basically a constant El Nino. Solar energy fluxing from ocean surface to atmosphere.
The super continent periods had some really nasty climate conditions due in part to the stagnant currents. When the land masses broke up, there was frequently an explosion of live forms.
Interesting. My guess is there is a connection between solar flux and wind driven ocean currents (pressure differentials). Do not know if UV, solar wind or magnetic field flux though.
Not me. I’ll be skiing my ass off.
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