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Marine proxy evidence linking decadal North Pacific and Atlantic climate |
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| Authors: | S Hetzinger J Halfar J V Mecking N S Keenlyside A Kronz R S Steneck W H Adey P A Lebednik |
| Institution: | 1. CPS-Department, University of Toronto Mississauga, 3359 Mississauga Rd. N, Mississauga, ON, L5L 1C6, Canada 2. IFM-GEOMAR, Leibniz Institute of Marine Sciences, Wischhofstr. 1-3, 24148, Kiel, Germany 3. IFM-GEOMAR, Leibniz Institute of Marine Sciences, Düsternbrooker Weg 20, 24105, Kiel, Germany 8. Geophysical Institute and Bjerknes Centre for Climate Research, University of Bergen, Bergen, Norway 4. Geowissenschaftliches Zentrum, University of G?ttingen, Goldschmidtstr. 1, 37077, G?ttingen, Germany 5. Darling Marine Center, University of Maine, 193 Clarks Cove Road, Walpole, ME, 04573, USA 6. Department of Botany, Smithsonian Institution, 10th and Constitution Ave, NW, Washington, DC, 20560-0166, USA 7. ARCADIS U.S. Inc., 2033 North Main Street, Suite 340, Walnut Creek, CA, 94596, USA |
| Abstract: | Decadal- to multidecadal variability in the extra-tropical North Pacific is evident in 20th century instrumental records and has significant impacts on Northern Hemisphere climate and marine ecosystems. Several studies have discussed a potential linkage between North Pacific and Atlantic climate on various time scales. On decadal time scales no relationship could be confirmed, potentially due to sparse instrumental observations before 1950. Proxy data are limited and no multi-centennial high-resolution marine geochemical proxy records are available from the subarctic North Pacific. Here we present an annually-resolved record (1818–1967) of Mg/Ca variations from a North Pacific/Bering Sea coralline alga that extends our knowledge in this region beyond available data. It shows for the first time a statistically significant link between decadal fluctuations in sea-level pressure in the North Pacific and North Atlantic. The record is a lagged proxy for decadal-scale variations of the Aleutian Low. It is significantly related to regional sea surface temperature and the North Atlantic Oscillation (NAO) index in late boreal winter on these time scales. Our data show that on decadal time scales a weaker Aleutian Low precedes a negative NAO by several years. This atmospheric link can explain the coherence of decadal North Pacific and Atlantic Multidecadal Variability, as suggested by earlier studies using climate models and limited instrumental data. |
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