noaa-recon-12905 Subpolar North Atlantic 2000 Year Diatom August SST Reconstruction Miettinen, A.; Divine, D.V.; Koç, N.; Godtliebsen, F.; Hall, I.R. Subpolar North Atlantic 2000 Year Diatom August SST Reconstruction 2012-04-24 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/12905 Investigator A. Miettinen Investigator D.V. Divine Investigator N. Koç Investigator F. Godtliebsen Investigator I.R. Hall earth science paleoclimate climate reconstructions|paleoceanography age,null,null,year Common Era,null,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate climate reconstructions|paleoceanography sea surface temperature,diatom assemblage,null,degree Celsius,Aug,climate reconstructions|paleoceanography,null,null,N,null earth science paleoclimate paleocean reconstruction earth science paleoclimate reconstructions sea surface temperature earth science paleoclimate paleocean population abundance geoscientificInformation Meridional Overturning Circulation (MOC) PAGES 2k Network PAGES Ocean 2k Sea Surface Temperature Reconstruction 2 AD 2004 AD 1948 cal yr BP -54 cal yr BP Complete 57.4515 57.4515 -27.9088 -27.9088 -2630 -2630 Ocean Atlantic Ocean North Atlantic Ocean RAPiD-21-COM>LATITUDE 57.4515>LONGITUDE -27.9088 None Please cite original publication, online resource, dataset and publication DOIs (where available), and date accessed when using downloaded data. If there is no publication information, please cite investigator, title, online resource, and date accessed. The appearance of external links associated with a dataset does not constitute endorsement by the Department of Commerce/National Oceanic and Atmospheric Administration of external Web sites or the information, products or services contained therein. For other than authorized activities, the Department of Commerce/NOAA does not exercise any editorial control over the information you may find at these locations. These links are provided consistent with the stated purpose of this Department of Commerce/NOAA Web site. English DOC/NOAA/NESDIS/NCEI National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce https://www.ncdc.noaa.gov/data-access/paleoclimatology-data DATA Center Contact Bruce Bauer bruce.a.bauer@noaa.gov paleo@noaa.gov 303-497-6280 303-497-6513

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Boulder CO 80305-3328 USA online ASCII Miettinen, A., D. Divine, N. Koç¸ F. Godtliebsen, and I.R. Hall 2012 Journal of Climate 25 12 4205-4219 10.1175/JCLI-D-11-00581.1

A 2800-yr-long August sea surface temperature (aSST) record based on fossil diatom assemblages is generated from a marine sediment core from the northern subpolar North Atlantic. The record is compared with the aSST record from the Norwegian Sea to explore the variability of the aSST gradient between these areas during the late Holocene. The aSST records demonstrate the opposite climate tendencies toward a persistent warming in the core site in the subpolar North Atlantic and cooling in the Norwegian Sea. At the multicentennial scale of aSST variability of 600-900 yr, the records are nearly in antiphase with warmer (colder) periods in the subpolar North Atlantic corresponding to the colder (warmer) periods in the Norwegian Sea. At the shorter time scale of 200-450 yr, the records display a phase-locked behavior with a tendency for the positive aSST anomalies in the Norwegian Sea to lead, by ~30 yr, the negative aSST anomalies in the subpolar North Atlantic. This apparent aSST seesaw might have an effect on two major anomalies of the European climate of the past Millennium: Medieval Warm Period (MWP) and the Little Ice Age (LIA). During the MWP warming of the sea surface in the Norwegian Sea occurred in parallel with cooling in the northern subpolar North Atlantic, whereas the opposite pattern emerged during the LIA. The results suggest that the observed aSST seesaw between the subpolar North Atlantic and the Norwegian Sea could be a surface expression of the variability of the eastern and western branches of the Atlantic meridional overturning circulation (AMOC) with a possible amplification through atmospheric feedback. STUDY NOTES: A 2000-year-long (0-2004 AD) August Sea Surface Temperature (aSST) record with high-resolution. The aSST reconstruction is based on fossil diatom assemblages and the weighted averaging partial least squares (WA-PLS) transfer function method. Core Rapid 21-COM represents a composite of two individual sediment cores (Rapid 21-12B and Rapid 21-3K), which were recovered from the southern limb of the Gardar Drift, south of Iceland, during the RRS Charles Darwin cruise 159 in 2004. The age model for core Rapid 21-COM is based on 210Pb dating for the 54.3-cm-long sediment box-core Rapid 21-12B (Boessenkool et al. 2007) and on 14C dating for the 372.5-cm-long kasten core Rapid 21-3K (Boessenkool et al. 2007; Sicre et al. 2011). The previously published diatom-based aSST record from core Rapid 21–12B has 2-yr-average resolution for the last 230 years (Miettinen et al. 2011). Core Rapid 21-3K was sampled continuously at 1.0-cm intervals and analyzed at 1- to 5-cm intervals with a resolution of 8-10 yr for the interval AD 800-1770, representing the highest-resolution diatom SST reconstruction from the subpolar North Atlantic for this period, and 40 yr for interval 0-AD 800. Composite core Rapid 21-COM: 57°27.09'N, 27°54.53'W, 2,630 m water depth

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/miettinen2012/miettinen2012.xls GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/miettinen2012/miettinen2012.txt USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11