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GSA TODAY October Vol Vol. 10, No. 10 October 2000 INSIDE • Section Meetings North-Central, p. 22 Cordilleran and GSA TODAY Summit 2000, p. 9 AAPG, p. 24 A Publication of the Geological Society of America • Committee Nominations, p. 26 • Awards Nominations, p. 31 Evaluating Global Warming: A Post-1990s Perspective David S. Gutzler, Department of Earth and Planetary Sciences, University of New Mexico, Albuquerque, NM 87131-1116, USA, [email protected] ABSTRACT paradigms for partnership with policy warmest year is 1998; the year just ended, makers, with greater emphasis on obser- 1999, is the fifth warmest in the record. Globally averaged surface-air tem- vations of past and present climate The temperature data in Figure 2 are perature warmed approximately 0.5 °C change. subject to significant uncertainties, but during the twentieth century, and the these are relatively well constrained. There rate of warming has accelerated consid- INTRODUCTION is no serious doubt that surface tempera- erably since about 1980. Proxy climate tures warmed somewhat in the twentieth Earth’s climate is warming. The data suggest that current global temper- century and that the warming trend accel- Athabasca glacier shown in Figure 1 has atures are warmer than at any time in erated near the end of the century. In steadily retreated during this century, as the last millennium. As addition to measurement this trend persists, the uncertainties associated likelihood increases that with particular thermome- the warming is due at least ters, the network of ther- in part to anthropogenic mometers over the world inputs of atmospheric oceans is quite sparse, and greenhouse gases. There numerous temperature is no debate over the mea- records over land are taken sured increases in green- at urban sites that may be house gas concentrations, subject to local microcli- or the anthropogenic origin matic warming as cities of these increases, or the grow (although the temper- direct radiative effect of ature data in Figure 2 have increased greenhouse gas been processed in an concentrations. attempt to remove this Public debate and pol- effect). Furthermore, glob- icy development on global ally averaged temperatures warming are stuck, how- in the lower troposphere ever, in part because it derived from satellites show remains exceedingly less rapid warming since difficult to specifically 1980 than the surface ther- attribute current global mometer data. The differ- warming to increases in ence between surface and greenhouse gases, or to satellite records has not make confident predic- been fully reconciled, but a tions of the rate and spa- Figure 1. Athabasca glacier in Jasper National Park, Alberta, Canada. A series of recent comparative study signs marks recent retreat of glacier’s snout. (Photo courtesy of P. Fawcett.) tial variability of future confirms the reality of the warming. Attribution and twentieth century surface prediction of global warming trend (National Research Coun- have many other glaciers throughout the warming both depend on large-scale cil, 2000). world (Oerlemans, 1994). Figure 2 shows modeling, and the complexities associ- During this same period, the atmo- an instrumental record of globally aver- ated with simulating the climate system spheric concentration of carbon dioxide, aged surface-air temperature since 1880, are so great that conclusive attribution methane, and several other important when sufficient thermometers were in ser- and prediction will probably not be greenhouse gases has increased substan- vice worldwide to make such an average reached for some time. These uncertain- tially (thick green curve, Fig. 2). There is meaningful. Temperature has increased ties tend to overshadow the higher no debate over the fact that greenhouse since 1880 by approximately 0.5 °C. The degree of certainty associated with gas concentrations are increasing rapidly warming trend has not been steady during observational evidence for global warm- and the buildup is unequivocally anthro- the twentieth century; rapid warming ing. The scientific community should pogenic (Intergovernmental Panel on Cli- during the first and last thirds of the cen- acknowledge that the attribution and mate Change, 1995), through burning of tury occurred before and after modest prediction problems will not be fossil fuels and forests and expanding cooling in mid-century. The six warmest resolved to the satisfaction of policy agriculture. makers in the near future, and should years of the 120-year record shown in instead work toward establishing new Figure 2 all occurred in the 1990s. The Global Warming continued on p. 2 IN THIS ISSUE GSA TODAY October Vol. 10, No. 10 2000 Evaluating Global Warming ......... 1 GSA Medals and Awards Nominations ........................ 31 GSA TODAY (ISSN 1052-5173) is published monthly Dialogue .............................. 3 by The Geological Society of America, Inc., with offices at 3300 GSA Division and Section Grants ...... 35 Penrose Place, Boulder, Colorado. Mailing address: P.O. Box Summit 2000 Annual Meeting .......... 9 9140, Boulder, CO 80301-9140, U.S.A. Periodicals postage paid at Boulder, Colorado, and at additional mailing offices. GSA Foundation Update . 38 Postmaster: Send address changes to GSA Today, Member GSA Annual Meeting Program ......... 10 Service Center, P.O. Box 9140, Boulder, CO 80301-9140. Toward a Stewardship of Pardee Keynote Symposia ............. 17 Copyright © 2000, The Geological Society of America, Inc. the Global Commons Part X .......... 40 (GSA). All rights reserved. Copyright not claimed on content GSA-Sponsored Short Courses ......... 18 prepared wholly by U.S. Government employees within the Letters ............................... 41 scope of their employment. Permission is granted to individ- uals to photocopy freely all items other than the science arti- Earth Science and the Field Forum Scheduled . 43 cles to further science and education. Individual scientists are Environment Events ................. 19 hereby granted permission, without royalties or further Bulletin and Geology Highlights ........ 44 requests, to make unlimited photocopies of the science arti- Graduate School Information Forum . 20 cles for use in classrooms to further education and science, Calendar ............................. 45 and to make up to five copies for distribution to associates in Hot Topics . ......................... 21 the furtherance of science; permission is granted to make more than five photocopies for other noncommercial, non- Classifieds ............................ 47 profit purposes furthering science and education upon pay- 2001 Section Meetings ment of a fee ($0.25 per page-copy) directly to the Copy- North-Central........................ 22 right Clearance Center, 222 Rosewood Drive, Danvers, Cordilleran/Pacific Section—AAPG..... 24 MA 01923 USA, phone (978) 750-8400, http://www. copyright.com; when paying, reference GSA Today, ISSN 1052-5173. 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GSA’S 2001 SUBSCRIPTIONS for 2000 calendar year: Society Members: GSA Today is provided as part of membership dues. Contact Member Service Center at 1-888-443-4472, online membership (303) 447-2020 or [email protected] for member- ship information. Nonmembers & Institutions: Free with paid subscription to both GSA Bulletin and Geology, renewal is available at otherwise $50 for U.S., Canada, and Mexico; $60 else- where. Contact Subscription Services. Single copies may be requested from Publication Sales. Also available on an www.geosociety.org/members/index.htm. annual CD-ROM, (together with GSA Bulletin, Geology, GSA Data Repository, and an Electronic Retrospective Index to journal articles from 1972); $89 to GSA Members, others call GSA Subscription Services for prices and details. Claims: For nonreceipt or for damaged copies, members contact Member Service Center; all others contact Subscription Ser- RENEW NOW! vices. Claims are honored for one year; please allow suffi- cient delivery time for overseas copies, up to six months. Dues statements will be mailed in October. STAFF: Chief Executive Officer: Sara S. Foland Science Editors: Karl E. Karlstrom, Department of Earth and Planetary Science, University of New Mexico, Albuquerque, NM 87131-1116, [email protected]; Molly F. Miller, Depart- ment of Geology, Box 117-B, Vanderbilt University, Nashville, Global Warming continued from p. 1 long-term environmental issues facing the TN 37235, [email protected] world today. In this paper I present one Director of Publications: Jon Olsen Managing Editor: Jeanette Hammann Although less than a degree of global view
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