Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 40, Issue 22, Pages 5954-5958Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2013GL058458
Keywords
paleoclimate; Mg; Ca thermometry; tropical Atlantic SST; multidecadal variability; solar variability; planktonic foraminifera
Categories
Funding
- NOAA [NA09OAR4310110]
- NSF [0705627, 1003219, 1053852]
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1003219] Funding Source: National Science Foundation
- Division Of Earth Sciences
- Directorate For Geosciences [1053852] Funding Source: National Science Foundation
- Division Of Ocean Sciences
- Directorate For Geosciences [1003364] Funding Source: National Science Foundation
- Division Of Ocean Sciences
- Directorate For Geosciences [0705627] Funding Source: National Science Foundation
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We present a high-resolution Mg/Ca reconstruction of tropical Atlantic sea surface temperatures (SSTs) spanning the last 2000years using seasonally representative foraminifera from the Cariaco Basin. The range of summer/fall SST over this interval is restricted to 1.5 degrees C, while winter/spring SST varies by 4.5 degrees C over the same time period suggesting that boreal winter variations control interannual SST variability in the tropical North Atlantic. Antiphasing between the two data sets, including a large divergence in the seasonal records circa 900 Common Era, can be explained by changes in Atlantic meridional overturning circulation and associated changes in surface/subsurface temperatures in the tropical North Atlantic as well as resultant changes in trade wind belt location and intensity. A statistically significant but nonlinear relation exists between reconstructed winter/spring temperatures and solar variability.
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