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Temperature record of the past 1000 years (view source)

Revision as of 04:04, 21 December 2020

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Many scientists and others are interested in the [[temperature record]] of [[Earth]]. Especially the temperature changes in the past 1000 years.
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[[File:2000 Year Temperature Comparison.png|thumb|250px|The temperature record of the past 2000 years from several different proxy methods]]
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[[Temperature]]s were not measured that far back, so weather records are used. Unfortunately, the weather records can be wrong, so the final temperature records are not accurate.
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People measure modern temperature records using instruments. Records only cover the last 150 years or so. The '''temperature record of the past 1,000 years''' or more is found by using data from what are called "climate proxy" records.  
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The average worldwide temperature will drop in about two centuries, for an ice age will occur.
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Proxies can be anything which relates to climate. Short term [[autobiographies]] often talk about the weather in past eras, and we do have some autobiographies from 2000 years ago. There are also [[tree rings]] and other methods which go back about 20,000 years. Further back still, there is evidence from geology, the record of the rocks. However, this page is just about the last 1000 years.<ref>Jones P.D; Briffa K.R; Barnett T.P. & Tett S.F.B. 1998, High-resolution palaeoclimatic records for the last millennium: interpretation, integration and comparison with General Circulation Model control-run temperatures, ''The Holocene'', '''8''' (4): 455–471. [https://journals.sagepub.com/doi/10.1191/095968398667194956]</ref><ref>Mann M.E; Bradley R.S. & Hughes M.K. 1999. Northern hemisphere temperatures during the past millennium: inferences, uncertainties, and limitations. ''Geophysical Research Letters'' '''26''' (6): 759–762. [https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/1999GL900070]</ref>
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We are fairly sure there was a warm period about 1,000 years ago, and a cold period about the 17th century. Even in the 19th century people skated on the [[Thames]] in wintertime.
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Although people today talk about [[climate change]] as if it were entirely man-made, this is not the complete picture. It is quite certain that climate has always been changing on [[Earth]]. Man-made changes are on top of changes which occur naturally. The [[Milankovich cycle]] is an important factor in these changes, and there are also changes in the heat put out by the [[Sun]].<ref>Powell, Alvin 2003. Sun's warming is global: CfA lecture links solar activity and climate change. ''Harvard University Gazette''. [https://web.archive.org/web/20061014045518/http://www.news.harvard.edu/gazette/2003/04.24/04-sun.html]</ref>
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== Related pages ==
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*[[Orbital forcing]]
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*[[Little Ice Age]]
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*[[Global warming]]
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== References ==
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{{reflist}}
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As fresh water, from the melting ice caps, is added to the Atlantic Ocean, the North Atlantic Current will come to a halt. This current is based on a balance of salt water and fresh water. Fresh water from the ice caps will damage this balance, the current will stop, and Europe, which is kept warm during the winter because of the North Atlantic Current, will freeze.
      
[[Category:Climate change]]
 
[[Category:Climate change]]
    
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