From lbutler at ucar.edu Tue Aug 22 15:35:22 2006 From: lbutler at ucar.edu (Lisa Butler) Date: Tue Aug 22 15:37:27 2006 Subject: [CCSM-ClimateChange] Announcement of AGU Session Message-ID: <44EB789A.4080600@ucar.edu> Hi all, I don't think this got through to you Climate Change people on my first try so I'm sending it again. Sorry if it's duplication! -------- Original Message -------- Subject: Announcement of AGU Session Date: Tue, 22 Aug 2006 15:25:19 -0600 From: Lisa Butler Reply-To: lbutler@ucar.edu To: ccsm-variability@cgd.ucar.edu, ccsm-paleoclimate@cgd.ucar.edu, ccsm-climatechange@cgd.ucar.edu CC: Lydia Shiver , wg-cochairs@cgd.ucar.edu Dear Colleagues, We hope you will consider attending a special session of the AGU fall meeting titled "Rapid Transition From Perennial to Seasonal Arctic Sea Ice". Our goal for the session is to bring together a diverse group of researchers to examine the recent decline in summertime Arctic sea ice. We are interested in looking at rapid summer sea ice decline in the recent observational record, the paleoclimate record, and global warming simulations. We also wish to consider the ecological and societal implications of rapid summer sea ice decline. The session will include invited presentations by four prominent researchers: Clara Deser (NCAR) - recent Arctic sea ice decline Anne deVernal (U. Quebec Montreal) - Arctic sea ice in past climates Harry Stern (Polar Science Center) - 'Tipping points' in Arctic sea ice Steven Amstrup (USGS Alaska) - sea ice decline and Polar bears The full session abstract is included below, and we would be happy to answer any questions about it (inquiries to deweaver@aos.wisc.edu). Please note that the deadline for AGU abstracts is September 7, 23:59UT. We hope you will share this information with any interested colleagues. Best Wishes, Eric DeWeaver and Cecilia Bitz (Session Conveners) ========================================================== AGU special session C17: Rapid Transition From Perennial to Seasonal Arctic Sea Ice Description: In recent times more than half the Arctic ocean has been covered year-round by sea ice, but the Arctic is now moving rapidly toward ice-free summers. In rough agreement with observations, some - but not all - climate models predict that the transition from perennial to seasonal sea ice will occur over the entire Arctic in this century. There is also speculation that abrupt sea ice transitions played an essential role in the rapid climate changes recorded in the Greenland ice cores. Beyond its climatic impact, a rapid change from perennial to seasonal sea ice will have dramatic societal and ecological effects, and the severity of these effects will depend in part of the abruptness of the change. While the basic feedback mechanisms are known, our understanding of the climate sensitivity of sea ice is relatively primitive. We lack an understanding of the key determinants of the speed with which the transition from perennial to seasonal ice will occur. A better understanding is needed to evaluate the disparate results of climate model simulations, and to assess the extent to which sea ice change in past climates can serve as a meaningful proxy for the present transition. Thus we invite papers which examine the transition to an ice-free Arctic summer based on theory, models of varying degrees of complexity, and observations from the instrumented record. We also seek papers that investigate rapid transitions in Arctic sea ice in the paleoclimate record and/or comparable sea ice behavior in the Antarctic. In addition, we welcome papers which consider the interannual and decadal variability of sea ice, as well as those addressing the far-field effects of sea ice change. To complement purely scientific studies of the sea ice transition, we further solicit papers on the policy implications of the transition, particularly those which focus on the implications of a rapid or abrupt transition. Sponsor: Cryosphere CoSponsors: Ocean Sciences Global Environmental Change Conveners: Eric DeWeaver AOS Dept/CCR, University of Wisconsin-Madison 1225 West Dayton St Madison, WI, USA 53706 608-265-5438 deweaver@aos.wisc.edu Cecilia Bitz Atmospheric Sciences Dept, University of Washington 408 Atmospheric Sciences Building University of Washington Seattle, WA, USA 98195-1640 206-543-1339 bitz@atmos.washington.edu -- Lisa Butler Administrative Assistant Climate Analysis Section Climate and Global Dynamics Division National Center for Atmospheric Research P.O. Box 3000 Boulder, CO 80307, USA Tel: 303-497-1366 Fax: 303-497-1333 Email: lbutler@ucar.edu Web: http://www.cgd.ucar.edu/cas/Staff/lisa/ -- Lisa Butler Administrative Assistant Climate Analysis Section Climate and Global Dynamics Division National Center for Atmospheric Research P.O. Box 3000 Boulder, CO 80307, USA Tel: 303-497-1366 Fax: 303-497-1333 Email: lbutler@ucar.edu Web: http://www.cgd.ucar.edu/cas/Staff/lisa/ From huberm at purdue.edu Mon Aug 21 21:51:01 2006 From: huberm at purdue.edu (Matthew Huber) Date: Tue Aug 22 15:44:20 2006 Subject: [CCSM-ClimateChange] agu session on tropical cyclones Message-ID: <0D19BE4D-64EE-4E0B-BEC9-039BB7511D28@purdue.edu> Hi all, please consider submitting an abstract to the following special union session on tropical cyclone and climate interactions, or forwarding this email on to someone who might be interested, thanks! -Matthew Huber U11:Tropical Cyclone-Climate Interactions on All Time Scales Sponsor: Union Convener: Jay Gulledge Pew Center on Global Climate Change 2101 Wilson Blvd Suite 550 Arlington, VA, USA 22201 703-516-0610 gulledgej@pewclimate.org Michael Mann Pennsylvania State University USA mann@meteo.psu.edu Kerry Emanuel Massachussetts Institute of Technology USA emanuel@texmex.mit.edu Matthew Huber Purdue University USA huberm@purdue.edu Peter Webster Georgia Tech USA pjw@eas.gatech.edu Index Terms: 1616 1630 1635 1637 4513 . Description: Strong linkages have been proposed between regional and global climate variability and tropical cyclone activity. Particularly controversial is the proposal that the Atlantic Multidecadal Oscillation (AMO) is the major climatological regulator of North Atlantic tropical cyclone activity. Understanding how modes of climate variability - both natural and anthropogenic - relate to tropical cyclone activity is critical for detecting and quantifying potential anthropogenic influences and projecting future changes in hurricane activity. We solicit studies further examining the dynamics and phenomenology of these linkages both within a modern climate context and within the context of the long term evolution of the Earth System. New results, either from models, data, or proxy data, demonstrating potential physical or biological feedbacks between climate and tropical cyclones are encouraged. -------------- next part -------------- An HTML attachment was scrubbed... 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