Back to Chapter 5_12


In East Greenland the warming

started after 1921

Abstract from:

Arctic air temperature change amplification and the Atlantic

Multidecadal Oscillation*)


(Abstract) Understanding Arctic temperature variability is essential for assessing possible future melting of the Greenland ice sheet, Arctic sea ice and Arctic permafrost. Temperature trend reversals in 1940 and 1970 separate two Arctic warming periods (19101940 and 19702008) by a significant 19401970 cooling period. Analyzing temperature records of the Arctic meteorological stations we find that (a) the Arctic amplification (ratio of the Arctic to global temperature trends) is not a constant but varies in time on a multi-decadal time scale, (b) the Arctic warming from 19101940 proceeded at a significantly faster rate than the current 19702008 warming, and (c) the Arctic temperature changes are highly correlated with the Atlantic Multi-decadal Oscillation (AMO) suggesting the Atlantic Ocean thermohaline circulation is linked to the Arctic temperature variability on a multi-decadal time scale.

*) Chylek, P., C. K. Folland, G. Lesins, M. K. Dubey, and M. Wang (2009), ,

Geophys. Res. Lett., 36, L14801, doi:10.1029/ 2009GL038777.


Chapter 5_12

Book Page: 265

File: Arctic2008

Image: 2009/