Climate change index

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The IGBP Climate Change Index and Volcanic Eruptions.

The climate change index (IGBP Climate-Change Index) is a measure calculated annually by the International Geosphere-Biosphere Program (IGBP) until 2011, which characterizes the change in the global climate compared to the previous year. It was presented by the IGBP in Copenhagen in December 2009 .

The index summarizes various phenomena with the same weighting, which together give a relatively stable picture of the course of climate change. These are the measured quantities of the carbon dioxide content of the earth's atmosphere , mean temperature of the earth, height of sea ​​level and sea ice cover (summer minimum in the Arctic ).

Each parameter is normalized to a range from −100 to +100, whereby the value 0 means that no change can be determined.

Viewed individually, all of these parameters are subject to strong natural, short-term fluctuations. By using the climate change index, however, annual fluctuations in individual parameters are significantly smoothed out and the use of an additional smoothing statistical tool such as the moving average is not necessary.

The index was no longer updated after the 2011 value published in 2013; the IGBP ceased operations at the end of 2015.

Index values ​​so far

year index Cumulative index
1980 28 28
1981 49 77
1982 −21 56
1983 44 100
1984 4th 104
1985 −6 98
1986 9 107
1987 26th 133
1988 34 167
1989 19th 186
1990 33 219
1991 12 230
1992 −18 212
1993 12 225
1994 21st 246
1995 52 298
1996 −10 288
1997 37 325
1998 50 375
1999 3 378
2000 13 391
2001 26th 417
2002 42 459
2003 23 482
2004 18th 500
2005 45 545
2006 10 555
2007 42 596
2008 6th 602
2009 24 626
2010 37 663
2011 10 672

The years of the index decline can be correlated with volcanic eruptions : 1982 El Chichón , 1991 Pinatubo and 1995–97 Soufrière Hills .

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