Glacial-interglacial; Weathering; Carbon cycle; Atmospheric CO2
Abstract :
[en] We construct a range of estimates for the glacial-interglacial variations of CO2 consumption and bicarbonate production rates by continental weathering processes, using two models of continental weathering in conjunction with two data sets for present-day runoff and climate results from four GCMs. Both models consistently produce 25–35% higher global CO2 consumption and 30–40% higher bicarbonate production rates at the LGM than at present-day. In terms of CO2 consumed by silicate weathering, variations calculated here are more than 2.5 times smaller than those derived from the marine Ge/Si record. Areas exposed both now and at the LGM exhibit only little change. The increased bicarbonate production (CO2 consumption) on the continental shelf exposed at the LGM overbalances the decrease due to ice cover by a factor of 3–4 (resp. 2.3–3.7). However, large uncertainties affect the fluxes in the shelf environment, as shown by sensitivity tests regarding its lithology.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Munhoven, Guy ; University of Bristol > School of Geographical Sciences
Language :
English
Title :
Carbon dioxide consumption and bicarbonate production rates by continental weathering at the LGM and at present-day an update
Publication date :
1999
Event name :
XXII General Assembly of the International Union of Geodesy and Geophysics
Event organizer :
International Union of Geodesy and Geophysics
Event place :
Birmingham, United Kingdom
Event date :
from 18-07-1999 to 30-07-1999
Audience :
International
Main work title :
Interactions Between the Cryosphere, Climate and Greenhouse Gases
Editor :
Tranter, M.
Armstrong, R.
Brun, E.
Jones, G.
Sharp, M.
Williams, M.
Publisher :
IAHS Press, Wallingford, United Kingdom
ISBN/EAN :
1901502902
Pages :
273-281
Peer reviewed :
Peer reviewed
Funders :
NERC - Natural Environment Research Council Royal Society
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