========================================================================= Date: Wed, 23 Jul 2008 01:41:31 -0700 Reply-To: Radiocarbon Mailing List Sender: Radiocarbon Mailing List From: =?ISO-8859-1?Q?Anne_Hormes?= Subject: AGU 2008 SESSION: Progress in Quaternary Geochronology in Polar Regions Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="ISO-8859-1" Dear Radiocarbon list members: We would like to draw your attention to the Paleoceanography and Paleoclimatology session (PP25) =93Progress in Quaternary Geochronology i= n Polar Regions=94 at the AGU Fall Meeting 2008 in San Francisco, December 15-19, 2008. The main purpose of this session is to provide an opportunity for discuss= ion of recent progress and challenges in developing chronologies in Arctic an= d Antarctic regions. We hope to include, but are not limited to, research = in the fields of ice-core chronology, tephrochronology, dendrochronology and= DNA analysis, as well as cosmogenic nuclide, radiocarbon and luminescence= dating. We encourage a discussion of new developments in chronological methods with regard to different paleoclimate archives and the advantages= and weaknesses of various methods. Please consider submitting an abstrac= t for this session. The abstract submission deadline is September 10 and further information = is published on the AGU Fall Meeting website: http://www.agu.org/meetings/fm08/?content=3Dsearch&show=3Ddetail&= sessid=3D675 Best wishes, Anne Hormes, Meredith Kelly and Claire Todd Conveners Anne Hormes anne.hormes@unis.no phone +47 7902 6453 The University Centre in Svalbard Pb 156 N-9171 Longyearbyen Norway, Svalbard Meredith Kelly meredith@ldeo.columbia.edu phone +1 845 365 8675 Lamont-Doherty Earth Observatory of Columbia University P.O Box 1000 Palisades NY 10964-1000 Claire Todd toddce@plu.edu phone +1 253 536-5163 Pacific Lutheran University Geosciences Department Tacoma WA 98447 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D To unsubscribe from this list, send the command SIGNOFF C14-L to LISTSERV@LISTSERV.ARIZONA.EDU, or send a request to C14-L-request@LISTSERV.ARIZONA.EDU. ========================================================================= Date: Wed, 23 Jul 2008 14:25:39 -0600 Reply-To: Radiocarbon Mailing List Sender: Radiocarbon Mailing List From: Thomas Marchitto Subject: AGU Fall 2008 Session Announcement: Radiocarbon Evidence for Past Changes in the Global Carbon Cycle and Ocean Circulation Comments: cc: Laura Robinson MIME-Version: 1.0 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Dear Colleagues:

Please consider submitting an abstract to the 2008 AGU Fall Meeting session on “Radiocarbon Evidence for Past Changes in the Global Carbon Cycle and Ocean Circulation,” described below.  The meeting will be held December 15-19 in San Francisco, and abstracts are due online by September 10. 

http://www.agu.org/meetings/fm08/
http://www.agu.org/meetings/fm08/?content=search&show=detail&sessid=553

PP15: Radiocarbon Evidence for Past Changes in the Global Carbon Cycle and Ocean Circulation

The past carbon-14 activities of the atmosphere and oceans provide important insights into the history of the global carbon cycle. Radiocarbon production in the atmosphere is modulated by the strength of the Earth’s magnetic field and by solar activity, but its atmospheric concentration is also affected by carbon exchange between the atmosphere, terrestrial biosphere, and oceans. Hence the abundance of radiocarbon in these various reservoirs may be used to trace the large-scale movement and storage of Earth’s mobile carbon. Radiocarbon is also one of the few paleo-tracers that has the potential to constrain rates of past ocean ventilation. Existing measurements suggest that parts of the deep sea were more isolated from the atmosphere during the last ice age, followed by renewed overturning during deglaciation. We invite studies that address these and related topics through reconstruction and modeling of atmospheric and oceanic radiocarbon activities through time.

Cheers,

Tom Marchitto, University of Colorado
Laura Robinson, Woods Hole Oceanographic Institution

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