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

被引：36

作者：

Springer, Gregory S. ^{[1
]}

Rowe, Harold D. ^{[2
]}

Hardt, Ben ^{[3
]}

Edwards, R. Lawrence ^{[1
,3
]}

Cheng, Hai ^{[3
]}

机构：

[1] Ohio Univ, Dept Geol Sci, Athens, OH 45701 USA

[2] Univ Texas Arlington, Dept Geol, Arlington, TX 76019 USA

[3] Univ Minnesota Twin Cities, Dept Geol & Geophys, Minneapolis, MN 55455 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2008年 / 35卷 / 17期

关键词：

D O I：

10.1029/2008GL034971

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Elevated Sr/Ca ratios and delta C-13 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 delta C-13 time series yield coherent similar to 200 and similar to 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.

引用

页数：5

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