Corals, paleotemperature records, and the aragonite-calcite transformation

Title:
Corals, paleotemperature records, and the aragonite-calcite transformation
Authors:
Gill, Ivan P.; Olson, Jennifer J.; Hubbard, Dennis K.
Abstract:
Oxygen isotopic records from corals play an increasing role in paleoclimatic research and climatic modeling. Proxy records of sea-surface temperature are produced by isotopically analyzing samples drilled from aragonitic (CaCO3) coral skeletons. However, drilling aragonite causes a polymorphic inversion to calcite accompanied by 18O enrichment. The isotopic enrichment may occur through atmospheric exchange, CO2 degassing, or fractionation during digestion. Regardless of the mechanism, dry drilling produced isotopic shifts as large as 0.8{per thousand}, corresponding to an erroneous temperature decrease of 3 ° C. This error is larger than the global temperature rise since the Industrial Revolution, and a substantial part of the global temperature variation over the past 10 ka. Because the isotopic shift is inconsistent and can occur without the production of measurable calcite, detecting and correcting the isotopic shift may be difficult.
Citation:
Gill, I., J.J. Olson, and D.K. Hubbard. 1995. "Corals, paleotemperature records, and the aragonite-calcite transformation." Geology 23(4): 333-336.
Publisher:
Geological Society of America
DATE ISSUED:
1995-04
Department:
Geology
Type:
article
Additional Links:
10.1130/0091-7613(1995)023<0333:CPRATA>2.3.CO;2
PERMANENT LINK:
http://hdl.handle.net/11282/310213

Full metadata record

DC FieldValue Language
dc.contributor.authorGill, Ivan P.en_US
dc.contributor.authorOlson, Jennifer J.en_US
dc.contributor.authorHubbard, Dennis K.en_US
dc.date.accessioned2013-12-23T16:28:11Zen
dc.date.available2013-12-23T16:28:11Zen
dc.date.issued1995-04en
dc.identifier.citationGill, I., J.J. Olson, and D.K. Hubbard. 1995. "Corals, paleotemperature records, and the aragonite-calcite transformation." Geology 23(4): 333-336.en_US
dc.identifier.urihttp://hdl.handle.net/11282/310213en
dc.description.abstractOxygen isotopic records from corals play an increasing role in paleoclimatic research and climatic modeling. Proxy records of sea-surface temperature are produced by isotopically analyzing samples drilled from aragonitic (CaCO3) coral skeletons. However, drilling aragonite causes a polymorphic inversion to calcite accompanied by 18O enrichment. The isotopic enrichment may occur through atmospheric exchange, CO2 degassing, or fractionation during digestion. Regardless of the mechanism, dry drilling produced isotopic shifts as large as 0.8{per thousand}, corresponding to an erroneous temperature decrease of 3 ° C. This error is larger than the global temperature rise since the Industrial Revolution, and a substantial part of the global temperature variation over the past 10 ka. Because the isotopic shift is inconsistent and can occur without the production of measurable calcite, detecting and correcting the isotopic shift may be difficult.en_US
dc.language.isoen_USen_US
dc.publisherGeological Society of Americaen_US
dc.relation.url10.1130/0091-7613(1995)023<0333:CPRATA>2.3.CO;2en_GB
dc.subject.departmentGeologyen_US
dc.titleCorals, paleotemperature records, and the aragonite-calcite transformationen_US
dc.typearticleen_US
dc.identifier.volume23en_US
dc.identifier.issue4en_US
dc.identifier.startpage333en_US
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