Northwest Atlantic 116 Year Coralline Algae Mg/Ca Data Gamboa, G.; Halfar, J.; Hetzinger, S.; Adey, W.; Zack, T.; Kunz, B.; Jacob, D.E. Gamboa, G. Halfar, J. Hetzinger, S. Adey, W. Zack, T. Kunz, B. Jacob, D.E. North Atlantic Oscillation 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 (Cape St. Martin>LATITUDE 50.025>LONGITUDE -55.8833) (Bay Bulls>LATITUDE 47.3083>LONGITUDE -52.7892) (Quirpon Island>LATITUDE 51.5856>LONGITUDE -55.4248) 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 NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Gamboa, G. Investigator : Halfar, J. Investigator : Hetzinger, S. Investigator : Adey, W. Investigator : Zack, T. Investigator : Kunz, B. Investigator : Jacob, D.E. 2012-05-23 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/12946 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/gamboa2010/gamboa2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/gamboa2010/gamboa2010.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/gamboa2010/gamboa2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/gamboa2010/gamboa2010.xls English https://www.ncdc.noaa.gov/paleo/study/12946 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/gamboa2010/gamboa2010.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/gamboa2010/gamboa2010.xls 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. START YEAR: 1890 AD * END YEAR: 2006 AD -55.8833 47.3083 -52.7892 51.5856