Solar forcing of Holocene droughts in a stalagmite record from West Virginia in east-central North America

Details Solar forcing of Holocene droughts in a stalagmite record from West Virginia in east-central North America Solar forcing of Holocene droughts in a stalagmite record from West Virginia in east-central North America

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3517703s&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 17, CiteID L17703

Physics

5

Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Global Change: Solar Variability (7537), Global Change: Climate Dynamics (0429, 3309), Hydrology: Drought

Scientific paper

Elevated Sr/Ca ratios and δ 13C values in Holocene-age stalagmite BCC-002 from east-central North America record six centennial-scale droughts during the last five North Atlantic Ocean ice-rafted debris (IRD) episodes, previously ascribed to solar irradiance minima. Spectral and cross-spectral analyses of the multi-decadal resolution Sr/Ca and δ 13C time series yield coherent ~200 and ~500 years periodicities. The former is consistent with the de Vries solar irradiance cycle. Cross-spectral analysis of the Sr/Ca and IRD time series yields coherent periodicities of 715- and 455-years, which are harmonics of the 1,450 +/- 500 year IRD periodicity. These coherencies corroborate strong visual correlations and provide convincing evidence for solar forcing of east-central North American droughts and strengthen the case for solar modulation of mid-continent climates. Moisture transport across North America may have lessened during droughts because of weakened north-south temperature and pressure gradients caused by cooling of the tropical Pacific and Atlantic Oceans.

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