From: "IPCC WGI TSU" Subject: IPCC Draft Good Practice Guidance Paper on Detection and Attribution for Review Date: Tue, 10 Nov 2009 04:59:07 +0100 (CET) Reply-to: wg1@ipcc.unibe.ch Cc: stocker@climate.unibe.ch, qdh@cma.gov.cn, barros@at.fcen.uba.ar, cfield@ciw.edu, plattner@ipcc.unibe.ch, krisebi@ipcc-wg2.gov, midgley@ipcc.unibe.ch, tignor@ipcc.unibe.ch, wg1@ipcc.unibe.ch, tsu@ipcc-wg2.gov Content-Type: text/plain; charset="iso-8859-1" X-MIME-Autoconverted: from 8bit to quoted-printable by ueamailgate02.uea.ac.uk id nAA3xK1S014515 Dear Participants of the IPCC Expert Meeting on Detection & Attribution, dear Colleagues, Please find attached the draft version of the Good Practice Guidance Paper (GPGP) which has been prepared by the Core Writing Team (CWT) following the IPCC joint WGI/II Expert Meeting on Detection and Attribution. Gabi, Ove, Camille, David, Gino, Marty, Peter, and Sari, have been working very hard to meet the TSU deadline and have managed to provide the Co-Chairs with the attached draft version right in time for presentation at the IPCC Plenary in Bali the last week of October. We all owe them our sincere thanks for the efforts put into the preparation of this document. Logistics: We would now like to invite all participants of the Geneva Expert Meeting to review the GPGP and to provide comments and suggestions on the attached draft within 2 weeks from today (i.e. by *November 24*). If you do plan to provide your inputs, please prepare your comments in a separate document (word or plain text) in order to facilitate the handling of the comments from potentially ~30 participants. Submission of the files will be by email to the WGI TSU at wg1@ipcc.unibe.ch. We will collect all the reviews, combine them into an easily manageable format and will then forward them to the CWT. The task of the CWT will then be to consider all your comments and revise the GPGP accordingly. We do not plan to send the Guidance Paper out for a second round of comments, but trust that the CWT will make every effort to take your suggestions into account as much as possible. Changes to terminology discussed in Geneva: Please note that the CWT, after intense discussions, had to make a few changes to the language used in the "approved" documents from the last day's final plenary. One of the changes is the change from "direct" to "single step" attribution. Given the level of discussion created within the CWT and also during the meeting, the CWT felt it was more constructive NOT to insinuate which methods are better or stronger and so strived for neutral language, particularly as the views about what constitutes a strong method differed between groups (not only IPCC WGs). Note that the word “direct” already had created discussion during the final plenary of the Geneva meeting and was flagged as unresolved in the material sent to the CWT by the WGI TSU. As a consequence, the CWT has then changed "sequential" to "multi-step" to keep language consistent. The CWT has highlighted in the text by brackets where language was changed in order to maintain maximum transparency. Material to be included in the Expert Meeting Report: The GPGP will be part of the full meeting report which we are currently preparing at the WGI TSU. The full meeting report will include all the materials from the conference documentation, i.e. abstracts, participants list, agenda, etc. In Geneva, we also discussed to include additional science background material going along with the Guidance Paper. In light of the substantial GPGP we currently have, it seems sufficient to add a few (2-3) practical examples of D&A to the report which would illustrate and clarify in concrete terms the different points raised in the GPGP. As such examples are of a different nature than the GPGP text, we propose to present them in separate boxes. Our proposal is that the CWT will work on these D&A examples while the participants are commenting on the GPGP, and while the WGI TSU works on preparing the full meeting report. A further science element to be included in the full meeting report would be a non-comprehensive bibliography of D&A literature added at the end of the report (see separate email following). I hope this way forward is acceptable to you. Thank you very much for your continued efforts and contributions to this important IPCC activity. We are looking forward to your inputs, Cheers, Kasper IPCC WGI TSU -------------------------------------------------- Intergovernmental Panel on Climate Change Working Group I Technical Support Unit University of Bern Zaehringerstrasse 25 3012 Bern, Switzerland ph: +41 31 631 56 16 fx: +41 31 631 56 15 http://www.ipcc.unibe.ch -------------------------------------------------- Attachment Converted: "c:\eudora\attach\IPCC_Guidance_DA_v081109.pdf"