| PALEOLIMNOLOGY |
Possible solar forcing of century-scale drought frequency in the northern Great Plains
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Yu, Z.. 1999. Possible solar forcing of century-scale drought frequency in the northern Great Plains. Geology Vol. 27, pp.
263-266, March 1999
| Data Coverage |
North: 48.00806 * South: 48.00806 |
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West: -101.53028 * East: -101.53028 |
Start Year: 2060 cal yr BP * End Year: -49 cal yr BP
Data: Please Cite Data Contributors!
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Summary: A 2100-yr decadal-resolution salinity and aridity proxy record of lacustrine ostracode-shell Mg/Ca ratios from a closed-basin
lake in the northern Great Plains shows statistically significant periodicities of ~400, 200, 130, and 100 yr. These periodicities
are similar to the three principal solar-oscillation periods (420, 218, 143 yr) as inferred from the atmospheric radiocarbon
record, suggesting strong solar forcing of century-scale drought frequency with a fundamental 400-yr period and its 2nd, 3rd,
and 4th harmonics. Our proxy record correlates visually and statistically (cross-spectral analysis) with the atmospheric D14C
record (solar proxy) and the GISP2 (Greenland Ice Sheet Project Two) d18O record (climate proxy), showing that solar minima
are in phase with drought periods in the northern Great Plains and cold periods in Greenland. This spectral similarity together
with phase correlation indicates a possible teleconnection of century-scale global climate fluctuations through common solar
forcing.
More Info on Paleolimnology |
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Complete XML Record: noaa-lake-5478
(Last Revised: 2007-09-05 )
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