The surface of Greenland has melted almost completely this summer

[RV-P]

- Tell me, then, what was the value of the rise in temperature when the medieval climatic optimum (between 900 and 1300 AFTER JC), whenEric the Red has discovered Greenland ICE FREE (Green Earth)! What? Would there be an "omerta" on this?!? ...

[dedeleco]

No omerta, and this is stated in books and on wikipedia, and it was not all the earth, as noted for the current warming.

125000 years ago there was a stronger warming, from all over the earth, from 2 ° C to 3 ° C, with the seas 3m at 5m higher than at present, without the current CO2, half of Greenland melted, followed after between -100000 years and -19000 years by d huge ice ages, which shows that the climate of the earth has become more and more unstable on the 2 to 3 last million years !!

The same causes of fluctuations give temperature variations of the whole earth 5 to 10 times stronger than 3 million years ago !!!

It is an indisputable fact real scary !!

A little CO2 was enough to warm up and so now a lot of CO2 scares everyone !!

In other posts I put basic figures with links on Nature and wikipedia.

[Alain G]

He knows everything about poor Dede!


For those who are interested:

http://co2climate.e-monsite.com/pages/l ... iques.html

[dedeleco]

He knows everything about poor Dede!


For those who are interested:

http://co2climate.e-monsite.com/pages/l ... iques.html

I know and have read this and wikipedia, with my morbid curiosity, that the earth with its water vapor is a wonderful bubble chamber to detect cosmic rays !!!
http://fr.wikipedia.org/wiki/Chambre_%C3%A0_brouillard
http://en.wikipedia.org/wiki/Cloud_chamber
http://public.web.cern.ch/Public/fr/Res ... UD-fr.html

These cosmic rays are scary to see reproduce their 1859 explosion, capable of destroying all fragile electrical installations, already well lived in Quebec with much less, and all the earth without electricity, with 3 days as many cosmic rays as in 40 years !!!.
http://fr.wikipedia.org/wiki/%C3%89rupt ... re_de_1859
http://en.wikipedia.org/wiki/Solar_storm_of_1859
http://www.planete-revelations.com/t104 ... agnetiques
http://www.podcastscience.fm/dossiers/2 ... -solaires/
http://www.history.com/news/a-perfect-s ... gton-event

etc ....


The problem is that it is the importance of this phenomenon, discussed by some, (with a real reality in my opinion), is far from proven by the activity of the sun, on the last 3 million years, to explain these huge climate variations, which make it 20000 years ago Alain G in Canada would have been on 2 to 3 km of thick ice to flush with flint and 125000 3 years ago to 5 ° C warmer to to watch more than half of Greenland well green, completely melted and Quebec much more under water !! .
With this and the cycles of Milankovitch, it is necessary to explain why the climate of the earth became very unstable as already shown on econology live from wikipedia:

https://www.econologie.com/forums/climat-fon ... 10469.html

https://www.econologie.com/forums/post193611.html#193611

http://en.wikipedia.org/wiki/Ice_age


Solar fluctuations, orbital and cosmic rays have no reason to be very different there is more than 3 million years !!

On these last 150 thousands of years, we can see that our stable period in T and sea level is totally abnormal compared to all other hot past, too long, too stable, and some think that prehistoric men, with culture , breeding, deforestation, hunting, by the released gases, prevented a beginning of return towards a glacial age ???????



If we continue to release greenhouse gases, doubly CO2, we are sure to be hotter than at Eemian 125000 years ago, it is hot without CO2 and more!
Instead of half of Greenland melted, we will have all the Greenland melted, instead of a gradual return to an ice age, as there is 115000 years!

Just looking at the past is instructive.

[moinsdewatt]

- Tell me, then, what was the value of the rise in temperature when the medieval climatic optimum (between 900 and 1300 AFTER JC), whenEric the Red has discovered Greenland ICE FREE (Green Earth)! What? Would there be an "omerta" on this?!? ...

Except that there was only a thin strip of coast of this continent which was green.

The rest were hundreds of meters of ice, just like now.

[dedeleco]

Just read the summary of the work of a lot of researchers:

http://fr.wikipedia.org/wiki/Optimum_cl ... i%C3%A9val

http://en.wikipedia.org/wiki/Medieval_Warm_Period

http://www.sciencemag.org/content/326/5957/1256

especially this in-depth study of the last 15000 years:

http://stockage.univ-brest.fr/~daniault ... t_C7_2.pdf


Read wikipedia before asking questions !!

Globally the Medieval Warm Period has been more recent than global temperatures.


Global temperatures are known to have varied over the years, but the spatial patterns have remained poorly defined. We used a global climate proxy network to reconstruct surface temperature patterns over this interval. The Medieval period is found in some regions of the world, but which falls well below recent levels globally. This period is marked by a tendency for La Niña-like conditions in the tropical Pacific. The coldest temperatures of the Little Ice Age are observed over the range of 1500 to 1400 CE, with greatest cooling over the extratropical Northern hemisphere continents. El Niño and the North Atlantic Ocean Oscillation-Arctic Oscillation


The 2009 Mann et al. 1961-1990 levels in Southern Greenland and parts of North America during the Medieval climate anomaly (950 to 1250) with warmth in some regions. Much of the Northern hemisphere showed significant cooling during the Little Ice Age (1400 to 1700) but the 1961-1990 period. [8]

The Vikings took advantage of ice-free seas to colonize Greenland and other outlying lands of the far north. [21] A settlement was found and excavated at L'Anse aux Meadows by Helge Ingstad, for example. Around 1000AD the climate was sufficiently warm for the north of Newfoundland to support a Viking colony and led to the descriptor "Vinland". The MWP was followed by the Little Ice Age, a period of cooling that lasted until the 19th century, and the Viking settlements vanished from history. [Citation needed]
L'Anse aux Meadows, Newfoundland, today, with reconstruction of Viking settlement

In the Chesapeake Bay, researchers found wide temperature excursions during the Medieval Warm Period (about 950-1250) and the Little Ice Age (about 1400-1700, with cold periods persisting in the early 20th of the North Atlantic thermohaline circulation. [22] Sediments in Piermont Marsh of the lower Hudson Valley show a dry Medieval Warm Period from AD 800-1300. [23]

Prolonged droughts of the western United States and especially eastern California and the west of Great Basin. [15] [24] Alaska experienced three time intervals of comparable warmth: AD 1-300, 850-1200, and post-1800. [25] Knowledge of the North American Medieval Warm Period Occupational Periods of Certain Native American Housing Sites, Especially in the United States of America [26] [27] Review of more recent archaeological research shows that the search for signs of unusual cultural changes during the MWP has broadened, some of these early patterns (for example, violence and health problems) long distance trade, and population movements) have been further corroborated

[sen-no-sen]

- Tell me, then, what was the value of the rise in temperature when the medieval climatic optimum (between 900 and 1300 AFTER JC), whenEric the Red has discovered Greenland ICE FREE (Green Earth)! What? Would there be an "omerta" on this?!? ...

It's not about: And if the earth did it alone de Laurent Cabrol?

lessdewatt wrote:

Except that there was only a thin strip of coast of this continent which was green.

The rest were hundreds of meters of ice, just like now.

Indeed, the huge icecap of Greenland is the result of tens of thousands of years of accumulation!

[RV-P]

- And right now, with the "endless" winter that Europe has taken (from October to the end of May), the glaciers of the Alps should "take the hair of the beast", right!? .. .
- There is much more than CO2 as a greenhouse gas: water vapor, methane ...! Next to it, CO2 is just a "bird pee" ...