| SPELEOTHEMS |
Denniston et al. 1999 Cold Water Cave Iowa Stalagmite Stable Isotope Data
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Denniston, R.F.;González, L.A.;Baker, R.G.;Reagan, M.K.;Bettis, E.A. 1999 Evidence for increased cool season moisture during
the middle Holocene. Geology Vol. 27, no. 9, p. 815-818
| Data Coverage |
North: 43.47 * South: 43.47 |
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West: -91.97 * East: -91.97 |
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Altitude: 356 m |
Start Year: -6648 AD
End Year: 1990 AD
Data: Please Cite Data Contributors!
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Summary: Isotopic analyses of three stalagmites from Cold Water Cave, northeast Iowa,
United States, reveal nearly identical d13C trends from ca. 7 to 2 ka.
However, d18O patterns differ by as much as 3 per mil from 5.7 to 3.2 ka.
These disparate d18O values reflect evaporative 18O enrichment in meteoric water
prior to infiltration, suggesting that previously calculated temperatures based
on a single Cold Water Cave stalagmite overestimated middle Holocene warming.
The coincidence of elevated middle Holocene growth rates in the stalagmites
with the lowest oxygen isotopic compositions indicates that the middle Holocene
was marked by a predominance of cool-weather precipitation during a period of
increased overall aridity.
More Info on Speleothems |
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Complete XML Record: noaa-cave-5425
(Last Revised: 2007-10-18 )
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| http://www.ncdc.noaa.gov/paleo/ |
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