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New papers suggest it was warmer 9,000 years ago (Read 1481 times)
lee
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Re: New papers suggest it was warmer 9,000 years ago
Reply #15 - Jun 2nd, 2018 at 5:16pm
 
DonDeeHippy wrote on Jun 2nd, 2018 at 4:39pm:
u missed this bit Lee
First of all, it is worth bearing in mind that any data on global temperatures before about 150 years ago is an estimate, a reconstruction based on second-hand evidence such as ice cores and isotopic ratios. The evidence becomes sparser the further back we look, and its interpretation often involves a set of assumptions. In other words, a fair amount of guesswork.



1. What makes you think I missed it?

2. You probably need to look closer than 1860 for estimations on global climate reconstructions.

They only did the ocean temperature reconstruction for the first time in the 1997. How's that for guesswork?
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Dnarever
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Re: New papers suggest it was warmer 9,000 years ago
Reply #16 - Jun 2nd, 2018 at 10:46pm
 
lee wrote on Jun 2nd, 2018 at 4:14pm:
Dnarever wrote on Jun 2nd, 2018 at 2:14pm:
It is not disagreeing with what has been long known only supporting the current position of temperatures in that era.


Really?

"After the last glaciation ended, global temperatures appear to have peaked around 6000 years ago, called the Holocene Climatic Optimum. The warming appears have been largely localised, concentrated in the northern hemisphere in summer, and average global temperatures did not exceed those of recent decades by much, if at all."

https://www.newscientist.com/article/dn11647-climate-myths-its-been-far-warmer-i...

That is part of the reason why the current state  of the climate science is called the "Adjustocene".

There have been claims that no it was cooler, hat it wasn't global.

"Evidence for an early Holocene climatic optimum in the Antarctic deep ice-core record"

https://link.springer.com/article/10.1007/BF00193529

"In the far Southern Hemisphere (New Zealand and Antarctica), the warmest period during the Holocene appears to have been roughly 8,000 to 10,500 years ago, immediately following the end of the last ice age.[10][11] By 6,000 years ago, the time normally associated with the Holocene Climatic Optimum in the Northern Hemisphere, they had reached temperatures similar to present ones, and they did not participate in the temperature changes of the north. However, some authors have used the term "Holocene Climatic Optimum" to describe the earlier southern warm period, as well."

https://en.wikipedia.org/wiki/Holocene_climatic_optimum

wiki references -

Masson, V.; Vimeux, F.; Jouzel, J.; Morgan, V.; Delmotte, M.; Ciais,P.; Hammer, C.; Johnsen, S.; Lipenkov, V.Y.; Mosley-Thompson, E.; Petit, J.-R.; Steig, E.J.; Stievenard, M.; Vaikmae, R. (2000). "Holocene climate variability in Antarctica based on 11 ice-core isotopic records".

.W. Williams; D.N.T. King; J.-X. Zhao K.D. Collerson (2004). "Speleothem master chronologies: combined Holocene 18O and 13C records from the North Island of New Zealand and their paleoenvironmental interpretation". The Holocene. 14 (2): 194–208. doi:10.1191/0959683604hl676rp.


If you read this slowly you will see that it is agreeing with what I said.

It is saying that the Temperature high was only in the northern hemisphere on the 5,000 year period. This means that it was not a global warming event.

Quote:
The warming appears have been largely localised, concentrated in the northern hemisphere in summer, and [highlight]average global temperatures did not exceed those of recent decades by much, if at all


The Northern hemisphere got hotter due to a change in the Earths orbit.

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lee
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Re: New papers suggest it was warmer 9,000 years ago
Reply #17 - Jun 2nd, 2018 at 11:21pm
 
Dnarever wrote on Jun 2nd, 2018 at 10:46pm:
If you read this slowly you will see that it is agreeing with what I said.



You mean  you want to ignore --

lee wrote on Jun 2nd, 2018 at 4:14pm:
"In the far Southern Hemisphere (New Zealand and Antarctica), the warmest period during the Holocene appears to have been roughly 8,000 to 10,500 years ago, immediately following the end of the last ice age.[10][11] By 6,000 years ago, the time normally associated with the Holocene Climatic Optimum in the Northern Hemisphere, they had reached temperatures similar to present ones, and they did not participate in the temperature changes of the north. However, some authors have used the term "Holocene Climatic Optimum" to describe the earlier southern warm period, as well."


Dnarever wrote on Jun 2nd, 2018 at 10:46pm:
It is saying that the Temperature high was only in the northern hemisphere on the 5,000 year period. This means that it was not a global warming event.



You obviously haven't heard of the polar see-saw.
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