File:Common Era Temperature.svg

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Summary

DescriptionCommon Era Temperature.svg	English: Temperatures with respect to the 1850-1900 mean as per IPCC definition of pre-industrial temperatures over the last 2 millennia and observational values ranging from 1880 to 2020. All data is smoothed using a 5 year moving average. The 2000 year record is computed in https://www.nature.com/articles/s41561-019-0400-0 using a wide set of proxies that have been vetted by the Pages2k Consortium ^[1]. They include tree ring data, data from corals and ice core data. A direct link to data is at https://figshare.com/articles/Reconstruction_ensemble_median_and_95_range/8143094 The observational data set is pulled from NASA: https://climate.nasa.gov/vital-signs/global-temperature/ NASA data is adjusted up by 0.188 degrees C since the IPCC says 2006 to 2015 is 0.87 degrees warmer than 1850 to 1900 and NASA averages 0.682 in that time frame. The 2000 year temperature is adjusted up by 0.287667, which is the NASA adjustment from above plus 0.099667 for the NASA average from 1961 to 1990 (the baseline for the 2000 year data set).
Date	23 February 2020
Source	Own work
Author	Efbrazil
Other versions	French version
SVG development InfoField	The SVG code is valid. This vector image was created with an unknown SVG tool. This file uses embedded text that can be easily translated using a text editor.

Work is derived from [Temperature reconstruction last two millennia.svg] by Femke Nijsse

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↑ Pages2k Consortium (2017). "A global multiproxy database for temperature reconstructions of the Common Era". Scientific Data 4: 170088. DOI:10.1038/sdata.2017.88. ISSN 2052-4463.

File history

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	Date/Time	Dimensions	User	Comment
current	03:31, 20 March 2024	960 × 720 (118 KB)	이강철 (WMKR)	File uploaded using svgtranslate tool (https://svgtranslate.toolforge.org/). Added translation for ko.
	09:41, 21 August 2022	960 × 720 (116 KB)	TAKAHASHI Shuuji	File uploaded using svgtranslate tool (https://svgtranslate.toolforge.org/). Added translation for ja.
	13:01, 17 January 2021	960 × 720 (114 KB)	Efbrazil	Updated with 2020 data
	21:36, 21 August 2020	960 × 720 (114 KB)	Efbrazil	Fixed background to fill image
	19:27, 31 July 2020	960 × 720 (114 KB)	Efbrazil	Added fahrenheit to far side of graph for easier consumption by US audiences
	15:54, 13 May 2020	960 × 701 (111 KB)	Nyq	Decapitalized common noun
	17:56, 2 April 2020	960 × 701 (111 KB)	Efbrazil	All data is now a 5 year moving average (indirect measurement was a 30 year average)
	00:11, 2 April 2020	960 × 701 (110 KB)	Efbrazil	fixing year 0 offset bug
	23:40, 30 March 2020	960 × 701 (110 KB)	Efbrazil	Rebuilt from the bottom up to eliminate the confidence intervals. Also re-baselined as per the description in the text- that the 2000 year temperatures are relative to the 1961 to 1990 average, which means adjusting them up by 0.288 C so they match the IPCC definition of the 1850 to 1900 average (the common baseline used on all climate change temp graphs). Previous baseline was about 0.1 degrees different because I used the 1860 to 1890 average from the data itself.
	19:55, 25 February 2020	960 × 701 (304 KB)	Efbrazil	Subtle tweaks