Thomas R. Knutson, Fanrong Zeng, and Andrew T. Wittenberg

Bulletin of the American Meteorological Society

Published date September 1, 2013

EEE 2012: The Extreme March-May 2012 Warm Anomaly Over the Eastern United States: Global Context and Multimodel Trend Analysis

Main findings:

The anthropogenic contribution to the extreme seasonal (MAM) warmth in 2012 over the eastern United States can be estimated as about 35%, or in terms of risk, anthropogenic forcing leads to a factor of 12 increase in the risk of such an event according to our calculations.

Full report:

EEE 2012: Explaining Extreme Events of 2012 from a Climate Perspective