noaa-ocean-12946 Northwest Atlantic 116 Year Coralline Algae Mg/Ca Data Gamboa, G.; Halfar, J.; Hetzinger, S.; Adey, W.; Zack, T.; Kunz, B.; Jacob, D.E. Northwest Atlantic 116 Year Coralline Algae Mg/Ca Data 2012-05-23 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/12946 Investigator G. Gamboa Investigator J. Halfar Investigator S. Hetzinger Investigator W. Adey Investigator T. Zack Investigator B. Kunz Investigator D.E. Jacob earth science paleoclimate corals and sclerosponges magnesium/calcium,Clathromorphum nereostratum,null,dimensionless,null,corals and sclerosponges,null,null,N,coralline red algae species earth science paleoclimate paleoceanography age,null,null,year Common Era,null,paleoceanography,null,null,N,null earth science paleoclimate paleocean geochemistry geoscientificInformation North Atlantic Oscillation 1890 AD 2006 AD 60 cal yr BP -56 cal yr BP Complete 47.3083 51.5856 -55.8833 -52.7892 Ocean Atlantic Ocean North Atlantic Ocean Cape St. Martin>LATITUDE 50.025>LONGITUDE -55.8833 Ocean Atlantic Ocean North Atlantic Ocean Bay Bulls>LATITUDE 47.3083>LONGITUDE -52.7892 Ocean Atlantic Ocean North Atlantic Ocean Quirpon Island>LATITUDE 51.5856>LONGITUDE -55.4248 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 Gamboa, G., J. Halfar, S. Hetzinger, W. Adey, T. Zack, B. Kunz, and D.E. Jacob. 2010. Mg/Ca ratios in coralline algae record northwest Atlantic temperature variations and North Atlantic Oscillation relationships. Journal of Geophysical Research, Vol. 115, C12044, doi:10.1029/2010JC006262.

Climate variability in the North Atlantic has been linked in part to the North Atlantic Oscillation (NAO). The NAO influences marine ecosystems in the northwestern Atlantic and transport variability of the cold Labrador Current. Understanding historic patterns of NAO variability requires long-term and high-resolution climate records that are not available from instrumental data. Here we present the first century-scale proxy record of sea surface temperature (SST) variability from the Newfoundland shelf, a region from which other annual-resolution shallow marine proxies are unavailable. The 116 year record was obtained from three sites along the eastern Newfoundland shelf using laser ablation inductively coupled mass spectrometry– determined Mg/Ca ratios in the crustose coralline alga Clathromorphum compactum. The alga is characterized by a high Mg-calcite skeleton exhibiting annual growth increments and a century-scale lifespan. Results indicate positive correlations between interannual variations in Mg/Ca ratios and both station-based and gridded instrumental SST. In addition, the record shows high spatial correlations to SST across the Newfoundland shelf and the Gulf of St. Lawrence. Before 1950 the Mg/Ca proxy record reveals significant departures from gridded temperature records. While the Newfoundland shelf is generally considered a region of negative correlations to the NAO, the algal time series as well as a recent modeling study suggest a variable negative relationship with the NAO which is strongest after ~1960 and before the mid-1930s. STUDY NOTES: 116 year Mg/Ca data from the massive coralline alga Clathromorphum compactum from the Northwest Atlantic. Living plants of C. compactum were collected from hard substrate via SCUBA at three localities along the eastern coastline of Newfoundland. Table 1. Site Information for C. compactum Specimens Collected Off Newfoundland, Canadaa Sample Site Location Lat. N Long. W Period SJ28-L1 Bay Bulls, St. Johns Newfoundland 47°18.496' 52°47.354' 1917-2006 SJ28-L2 Bay Bulls, St. Johns Newfoundland 47°18.496' 52°47.354' 1913-2006 SJ21-L1 Bay Bulls, St. Johns Newfoundland 47°18.496' 52°47.354' 1918-2006 SJ21-L2 Bay Bulls, St. Johns Newfoundland 47°18.496' 52°47.354' 1918-2006 QP4-3-L1 Quirpon Island Newfoundland 51°35.135' 55°25.490' 1931-2006 QP4-3-L2 Quirpon Island Newfoundland 51°35.135' 55°25.490' 1931-2006 170176 Cape St. Martin Newfoundland 50°1.5' 55°53' 1890-1963

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/gamboa2010/gamboa2010.txt GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/gamboa2010/gamboa2010.xls USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11