International Detection & Attribution Group

The "International Detection and Attribution Group" (IDAG) is a group of specialists on climate change detection and attribution, who have been collaborating on assessing and reducing uncertainties in the estimates of climate change since 1995 and who have made substantial contributions to the IPCC process and the US CCSP activities.

Early results from the group contributed to the IPCC Second Assessment Report (SAR; IPCC 1996) that found a "discernible" human influence on climate. Additional results were reported in a review paper by Barnett et al. (1999) and contributed to the IPCC Third Assessment Report (TAR; IPCC 2001), which concluded that "most of the observed warming over the last 50 years is likely to have been due to the increase in greenhouse gas concentrations."

In 2005 the IDAG group published a review paper (IDAG, 2005), which reported further evidence and open questions on the detection of climate change since the TAR. Group members were heavily involved in the Fourth Assessment, Working Group 1 activities, several serving as Coordinating, Review, or Lead Authors. Nearly all other group members were contributing authors to the IPCC effort.

Visit the IDAG website for more information.


IDAG and ETCCDI are closely linked through cross-membership.

Gabi Hegerl
Mike Wehner
Claudia Tebaldi Myles Allen
Tim Del Sole
Nathan Gillett
Phill Jones
David Karoly
Tom Knutson
Reto Knutti
Stephen Leroy
Seung-Ki Min
Doug Nychka
Ben Santer
Richard Smith
Daithi Stone
Peter Stott
Hans von Storch
Xuebin Zhang
Francis Zwiers