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Marine-based multiproxy reconstruction of Atlantic multidecadal variability

Svendsen, Lea; Hetzinger, Steffen; Keenlyside, Noel; Gao, Yongqi
Peer reviewed, Journal article
Published version
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URI
https://hdl.handle.net/1956/9369
Date
2014-02-28
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  • Geophysical Institute [1005]
Original version
https://doi.org/10.1002/2013gl059076
Abstract
Atlantic multidecadal variability (AMV) is known to impact climate globally, and knowledge about the persistence of AMV is important for understanding past and future climate variability, as well as modeling and assessing climate impacts. The short observational data do not significantly resolve multidecadal variability, but recent paleoproxy reconstructions show multidecadal variability in North Atlantic temperature prior to the instrumental record. However, most of these reconstructions are land-based, not necessarily representing sea surface temperature. Proxy records are also subject to dating errors and microenvironmental effects. We extend the record of AMV 90 years past the instrumental record using principle component analysis of five marine-based proxy records to identify the leading mode of variability. The first principal component is consistent with the observed AMV, and multidecadal variability seems to persist prior to the instrumental record. Thus, we demonstrate that reconstructions of past Atlantic low-frequency variability can be improved by combining marine-based proxies.
Publisher
Wiley
American Geophysical Union
Journal
Geophysical Research Letters
Copyright
Copyright 2014 American Geophysical Union. All Rights Reserved.

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