noaa-ocean-25111 Labrador and Nunavut Mg/Ca and d18O Data from Coralline Algae covering 1745-2014 CE Light, T.; Williams, B.; Halfar, J.; Hou, A.; Zajacz, Z.; Tsay, A.; Adey, W. Labrador and Nunavut Mg/Ca and d18O Data from Coralline Algae covering 1745-2014 CE 2018-09-10 NCDC-Paleoclimatology ONLINE Files Pending https://www.ncdc.noaa.gov/paleo/study/25111 Investigator T. Light Investigator B. Williams Investigator J. Halfar Investigator A. Hou Investigator Z. Zajacz Investigator A. Tsay Investigator W. Adey earth science paleoclimate corals and sclerosponges magnesium/calcium,Clathromorphum compactum,null,mole per mole,null,corals and sclerosponges,interpolated,electron probe x-ray microanalysis,N,Annually interpolated microprobe Mg/Ca data. earth science paleoclimate corals and sclerosponges magnesium/calcium,Clathromorphum compactum,null,mole per mole,null,corals and sclerosponges,interpolated,inductively-coupled plasma mass spectrometry|laser ablation,N,Monthly interpolated LA-ICP-MS Mg/Ca data for a replicate transect. earth science paleoclimate corals and sclerosponges age,null,null,year Common Era,null,corals and sclerosponges,null,null,N,Age assigned to OES C Mg/Ca data visually using growth bands earth science paleoclimate corals and sclerosponges age,null,null,year Common Era,null,corals and sclerosponges,null,null,N,Age assigned to Mg/Ca data visually using growth bands earth science paleoclimate corals and sclerosponges age,null,null,year Common Era,null,corals and sclerosponges,null,null,N,Age assigned to OES A Mg/Ca data visually using growth bands earth science paleoclimate corals and sclerosponges age,null,null,year Common Era,null,corals and sclerosponges,null,null,N,Age assigned to delta 18O data visually using growth bands earth science paleoclimate corals and sclerosponges delta 18O,Clathromorphum compactum,null,per mil VPDB,null,corals and sclerosponges,interpolated,isotope ratio mass spectrometry,N,Annually interpolatedd18o data earth science paleoclimate corals and sclerosponges age,null,null,year Common Era,null,corals and sclerosponges,null,null,N,Age assigned to MS A Mg/Ca data visually using growth bands earth science paleoclimate corals and sclerosponges magnesium/calcium,Clathromorphum compactum,null,mole per mole,null,corals and sclerosponges,interpolated,inductively-coupled plasma mass spectrometry|laser ablation,N,Monthly interpolated LA-ICP-MS Mg/Ca data for one transect. earth science paleoclimate corals and sclerosponges age,null,null,year Common Era,null,corals and sclerosponges,null,null,N,Age assigned to MS B Mg/Ca data visually using growth bands earth science paleoclimate corals and sclerosponges age,null,null,year Common Era,null,corals and sclerosponges,null,null,N,Age assigned to OES B Mg/Ca data visually using growth bands earth science paleoclimate corals and sclerosponges magnesium/calcium,Clathromorphum compactum,null,mole per mole,null,corals and sclerosponges,interpolated,inductively-coupled plasma atomic emission spectroscopy|laser ablation,N,Monthly interpolated LA-ICP-OES Mg/Ca data for a replicate transect. earth science paleoclimate corals and sclerosponges delta 18O,Clathromorphum compactum,null,per mil VPDB,null,corals and sclerosponges,interpolated,isotope ratio mass spectrometry,N,Annually interpolated d18o data earth science paleoclimate corals and sclerosponges age,null,null,year Common Era,null,corals and sclerosponges,null,null,N,Age assigned to microprobe Mg/Ca data visually using growth bands earth science paleoclimate corals and sclerosponges magnesium/calcium,Clathromorphum compactum,null,mole per mole,null,corals and sclerosponges,interpolated,inductively-coupled plasma atomic emission spectroscopy|laser ablation,N,Monthly interpolated LA-ICP-OES Mg/Ca data for one transect. earth science paleoclimate paleocean trace metals in carbonates earth science paleoclimate paleocean oxygen isotopes geoscientificInformation 1745 AD 2015 AD 205 cal yr BP -65 cal yr BP Complete 55.398056 67.560556 -64.031389 -59.846667 -17 -15 Ocean Atlantic Ocean North Atlantic Ocean Qikiqtarjuaq>LATITUDE 67.560556>LONGITUDE -64.031389 Ocean Atlantic Ocean North Atlantic Ocean Kingitok Island 2013-15(4)>LATITUDE 55.398056>LONGITUDE -59.846667 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 Light, T., Williams, B., Halfar, J., Hou, A., Zajacz, Z., Tsay, A., and Adey, W. 2018 Geochemistry, Geophysics, Geosystems 19 10.1029/2018GC007504

High-latitude climate reconstructions are essential for discerning anthropogenic climate change from natural climate variability. Since observational high-latitude climate records are rare prior to the satellite era, climate proxies such as the coralline algae Clathromorphum compactum are needed to generate these reconstructions. C. compactum is distributed across the northern high latitudes and documents environmental variability in the magnesium-to-calcium ratio (Mg/Ca) and d18O composition of its calcite skeleton. Therefore, paired Mg/Ca and d18O analyses in C. compactum are a promising new tool for reconstructing historic high-latitude climate change. Here a new method for C. compactum Mg/Ca analysis, laser ablation-inductively coupled plasma-optical emission spectroscopy (LA-ICP-OES), was verified through comparisons with parallel Mg/Ca transects using established techniques in a specimen from Labrador, Canada. Next, LA-ICP-OES Mg/Ca analysis in two specimens from Nunavut, Canada, was paired with d18O analyses. While Mg/Ca data across all specimens captured seasonal sea surface temperature (SST) variability, Mg/Ca values differed in replicate transects within skeleton formed at the same time regardless of technique used. This reduces the effectiveness of C. compactum Mg/Ca as a SST proxy on interannual time scales. Mg/Ca values and d18O composition differed between the two Nunavut specimens, and only one of them documented local SST, sea ice cover, and sea surface salinity. This indicates that climate archive verification is required for each unique coralline algal specimen. In the specimen from Nunavut verified here, paired Mg/Ca and d18O analyses produced more robust sea ice cover/sea surface salinity reconstructions than d18O analyses alone, supporting further development of this proxy system. STUDY NOTES: Mg/Ca and d18O data for 3 coralline algae specimens Provided Keywords: Coralline algae, LA-ICP-OES, Arctic SST, Mg/Ca, d18O

GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/light2018/light2018-qk-b.txt NOAA Template File; Qikiqtarjuaq Qk-B Mg/Ca and d18O Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/light2018/light2018-2013-15.txt NOAA Template File; Kingitok Island 2013-15(4) Mg/Ca Data GET DATA https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/light2018/light2018-qk-a.txt NOAA Template File; Qikiqtarjuaq Qk-A Mg/Ca and d18O Data USA/NOAA DIF Version 9.8.4 2018-12-11 2018-12-11