Amchitka Island Alaska 150 Year Corraline Algae Mg/Ca Data Hetzinger, S.; Halfar, J.; Mecking, J.V.; Keenlyside, N.S.; Kronz, A.; Steneck, R.S.; Adey, W.; Lebednik, P. Hetzinger, S. Halfar, J. Mecking, J.V. Keenlyside, N.S. Kronz, A. Steneck, R.S. Adey, W. Lebednik, P. North Atlantic Oscillation PAGES 2k Network PAGES Ocean 2k 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/corals and sclerosponges (magnesium/calcium,Clathromorphum nereostratum,null,dimensionless,null,corals and sclerosponges,normalized,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 (Kirlof Point, Amchitka Island>LATITUDE 51.4156>LONGITUDE 179.2996) 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. STUDY NOTES: 150 year Mg/Ca data from coralline alga collected near Amchitka Island, Aleutian Islands, Alaska. C. nereostratum is a long-lived, shallow-marine crustose coralline algae. Specimen AM-KR-80 8-69-14B collected in August 1969, 25 water depth, coralline algae, species: Clathromorphum nereostratum Sampling location: Kirlof Point, Amchitka Island, Alaska, 51°24.936'N, 179°17.976'E. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Hetzinger, S. Investigator : Halfar, J. Investigator : Mecking, J.V. Investigator : Keenlyside, N.S. Investigator : Kronz, A. Investigator : Steneck, R.S. Investigator : Adey, W. Investigator : Lebednik, P. 2012-04-02 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/12889 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hetzinger2011/hetzinger2011.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hetzinger2011/hetzinger2011.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hetzinger2011/hetzinger2011.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hetzinger2011/hetzinger2011.txt English https://www.ncdc.noaa.gov/paleo/study/12889 https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hetzinger2011/hetzinger2011.xls https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hetzinger2011/hetzinger2011.txt S. Hetzinger, J. Halfar, J.V. Mecking, N.S. Keenlyside, A. Kronz, R.S. Steneck, W.H. Adey and P.A. Lebednik. 2011. Marine proxy evidence linking decadal North Pacific and Atlantic climate. Climate Dynamics, Online First, 15 November 2011. DOI 10.1007/s00382-011-1229-4 START YEAR: 1818 AD * END YEAR: 1967 AD 179.2996 51.4156 179.2996 51.4156