# Arctic Ocean Surface Sediment Molecular Geochemistry Data #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite original publication, online resource and date accessed when using these data, # If there is no publication information, please cite investigator, title, online resource and date accessed. # # Online_Resource: https://www.ncdc.noaa.gov/paleo/study/15088 # # Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/stoynova2013/stoynova2013.txt # # Archive: Paleoceanography #-------------------- # Contribution_Date # Date: 2013-09-23 #-------------------- # Title # Study_Name: Arctic Ocean Surface Sediment Molecular Geochemistry Data #-------------------- # Investigators # Investigators: Stoynova, V.; Shanahan, T.M.; Hughen, K.A.; de Vernal, A. #-------------------- # Description_and_Notes # Description: The present study uses a suite of 121 archival core top surface (0-3 cm) sediment samples obtained from the Oregon State University Marine Geology Repository and the GEOTOP archives # #-------------------- # Publication # Authors: Stoynova, V., T.M. Shanahan, K.A. Hughen, and A. de Vernal # Published_Date_or_Year: 2012 # Published_Title: Insights into Circum-Arctic sea ice variability from molecular geochemistry # Journal_Name: Quaternary Science Reviews # Volume: # Issue: # Pages: # DOI: 10.1016/j.quascirev.2012.10.006 # Online_Resource: http://dx.doi.org/10.1016/j.quascirev.2012.10.006 # Abstract: Geological records of past sea ice, such as those contained in Arctic marine sediments, offer an opportunity to strengthen our understanding of long-term sea ice variability, provided unambiguous paleo-sea ice proxies can be developed. One such recently proposed proxy is IP25, a highly branched isoprenoid alkene biosynthesized exclusively by sea-ice dwelling diatoms (Haslea spp.), which is well preserved in marine sediments and could be used to reconstruct past changes in spring sea-ice extent. However, little is known about regional-scale controls on IP25 production in sea ice, limiting its wider applicability as a paleo-sea-ice proxy. To address this issue we examined the distributions of IP25 and the marine productivity biomarkers dinosterol and brassicasterol in a suite of surface sediment samples distributed across the Arctic. We find a statistically significant, logarithmic relationship between IP25 and spring sea ice cover in sediment samples from arctic and subarctic sites in the Pacific (n = 96, R2 = 0.67, P < 0.0001) and the Atlantic n = 25, R2 = 0.50, P < 0.0001), though the absolute concentrations of IP25 are generally higher in the Atlantic (1.6–166.4 µg/g OC) than in the Pacific (0–38.5 µg/g OC) for equivalent sea-ice cover, and there are regional and basin-specific differences in the slope of the IP25 – sea ice relationship. Using the PDIP25 index, which also includes a biomarker for marine productivity (e.g., dinosterol) the relationship with sea ice cover is improved in all of the study areas (R2 = 0.86 and R2 = 0.75 for Atlantic and Pacific, respectively) and most basin specific differences in the proxy–sea ice relationships are significantly reduced. However, there remain differences in the absolute magnitudes of the PDIP25 index for equivalent amounts of sea ice cover between the Atlantic and the Pacific, and with previously published data from Fram Strait. Nevertheless, this work demonstrates that the PDIP25 index can provide a valuable tool for sea ice reconstructions at local and regional scales. # #--------------------- # Funding_Agency # Funding_Agency_Name: US National Science Foundation OCE-Marine Geology and Geophysics Program # Grant: NSF-OCE-0961697 #--------------------- # Site_Information # Site_Name: Arctic Ocean # Location: Arctic Ocean # Country: # Northernmost_Latitude: 79.3151 # Southernmost_Latitude: 47.9055 # Easternmost_Longitude: 179.8 # Westernmost_Longitude: -179.567 # Elevation: #------------------ # Data_Collection # Core_Name: Arctic Surface-Stoynova13 # Earliest_Year: # Most_Recent_Year: # Time_Unit: # Core_Length: # Notes: #------------------ # Chronology # # #------------------ # Variables # # Data line variables format: Variables list, one per line, shortname- 9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) # Data line format: tab-delimited text, variable short name as header # ## Location site name,,, ,,,,,C, ## Latitude latitude,,,degrees North,,,,,N, ## Longitude longitude,,,degrees East,,,,,N, ## water_depth water depth,,,meters,,,,,N, ## TOC% total organic carbon,,,weight percent,,paleoceanography,,,N ## IP25 ice proxy with 25 carbons,,,µg/g OC,,paleoceanography,from concentration of a monounsaturated highly branched isoprenoid alkene,,N ## Brass Brassicasterol concentration,,,µg/g OC,,paleoceanography,,,N ## Dino Dinosterol concentration,,,µg/g OC,,paleoceanography,,,N ## PDIP25 Dinosterol-IP25 index,,, ,,paleoceanography,,,N #----------------- # Data # Missing Value: NA Location Latitude Longitude water_depth TOC% IP25 Brass Dino PDIP25 East Siberian Sea 74.617 160 46 1.09 9.99 43.74 22.24 0.70 East Siberian Sea 72.65 157.5 22 0.63 12.62 8.90 7.01 0.90 East Siberian Sea 70.65 170 29 1.18 8.12 32.92 23.91 0.63 East Siberian Sea 71.117 177.5 35 0.85 6.16 29.48 54.64 0.37 East Siberian Sea 70.783 163.5 15 0.48 11.06 29.40 46.07 0.55 Gulf of Alaska 55.5517 -134.7082 296 0.62 0.00 155.44 44.57 0.00 Gulf of Alaska 56.9556 -136.4278 1623 1.02 0.00 317.48 57.43 0.00 Gulf of Alaska 56.9856 -135.479 216 3.88 0.00 182.77 193.97 0.00 Gulf of Alaska 59.4398 -140.2541 238 0.48 0.00 116.89 67.78 0.00 Gulf of Alaska 58.7699 -144.4961 3686 0.58 0.00 13.33 17.92 0.00 Gulf of Alaska 59.6485 -145.1533 198 0.50 0.00 135.41 120.51 0.00 Gulf of Alaska 60.6628 -147.7081 744 0.79 0.10 39.22 94.03 0.01 Chukchi Sea 79.3151 -162.8858 2570 0.43 0.00 2.96 3.58 0.00 Chukchi Sea 67.467 -170.367 48 1.37 12.21 24.46 76.42 0.45 Chukchi Sea 67.583 -173.408 46 0.64 0.41 39.59 111.20 0.02 Chukchi Sea 69.417 -173.25 53 1.73 17.60 30.20 235.43 0.28 Chukchi Sea 69.892 -174.442 52 1.76 11.49 36.46 167.03 0.26 Chukchi Sea 69.8 -176.65 53 1.57 24.72 38.85 159.76 0.44 Chukchi Sea 69.75 179.8 50 0.91 38.49 69.58 138.01 0.59 Chukchi Sea 70.175 -179.567 44 0.85 7.88 89.68 102.27 0.28 Chukchi Sea 70.633 -179 38 0.84 25.45 60.72 90.44 0.59 Chukchi Sea 69.633 -171 53 1.30 11.16 50.63 258.14 0.18 East Siberian Sea 70.45 175 45 1.15 17.61 118.64 89.12 0.50 East Siberian Sea 70.917 175 39 1.30 24.29 159.92 483.51 0.20 East Siberian Sea 71.417 174.95 41 1.37 3.91 20.51 39.11 0.34 East Siberian Sea 71.167 170 38 1.29 6.60 2.58 1.89 0.95 East Siberian Sea 69.833 165.017 26 1.07 9.07 17.32 69.46 0.40 East Siberian Sea 71.167 159.95 10 0.76 6.45 3.02 5.67 0.85 East Siberian Sea 71.922 160.033 23 0.72 8.96 9.25 36.35 0.56 East Siberian Sea 71.75 155.033 17 0.79 4.63 28.86 82.07 0.22 East Siberian Sea 72.4 155.233 21 0.85 18.18 21.66 70.43 0.57 East Siberian Sea 73.067 155.367 34 1.06 3.25 6.21 23.69 0.41 East Siberian Sea 73.967 155.4 39 0.93 6.17 7.68 23.89 0.57 East Siberian Sea 73.333 149.667 16 0.52 9.26 17.97 40.67 0.54 East Siberian Sea 72.583 149.5 10 1.42 9.18 23.23 57.68 0.45 East Siberian Sea 74.133 146.667 15 0.39 19.44 11.68 30.14 0.77 East Siberian Sea 74.442 142.717 16 0.50 6.90 6.17 29.09 0.55 East Siberian Sea 74.5 140.433 28 0.98 15.99 19.75 38.72 0.68 East Siberian Sea 71.65 157 13 0.86 10.05 15.08 66.70 0.44 Bering Sea 62.008 -177 108 1.73 1.37 14.08 58.06 0.11 Chukchi Sea 69 -176 51 3.86 2.08 9.13 92.49 0.10 Chukchi Sea 68.483 -169.017 56 1.18 5.65 13.97 82.25 0.26 Chukchi Sea 68.017 -169.033 54 1.28 1.84 26.73 112.77 0.08 Chukchi Sea 68.033 -170 53 1.20 1.47 27.24 157.31 0.05 Chukchi Sea 68.033 -171 50 1.55 1.88 20.57 80.84 0.11 Chukchi Sea 68.033 -172.067 40 2.13 1.90 16.10 94.18 0.09 Sea of Okhotsk 54.9767 144.7517 1340 0.74 0.86 8.62 73.78 0.06 Sea of Okhotsk 55.2017 153.1667 550 1.47 0.24 56.29 124.61 0.01 Sea of Okhotsk 53.5717 147.6917 1380 1.11 0.16 2.81 24.08 0.03 Chukchi Sea 70.767 -167.65 53 1.08 17.72 60.17 260.15 0.26 Chukchi Sea 70.75 -165.5 41 0.70 0.36 4.47 20.43 0.08 Chukchi Sea 70.733 -164.5 43 0.98 12.88 13.90 109.17 0.38 Chukchi Sea 70.717 -163.5 48 0.72 28.89 29.06 95.57 0.61 Chukchi Sea 71.25 -160.5 43 1.08 24.77 9.70 65.30 0.66 Chukchi Sea 71.25 -159.5 48 1.25 16.57 22.15 82.25 0.51 Chukchi Sea 69.8 -166.5 43 0.85 13.16 14.37 124.50 0.35 Chukchi Sea 69.783 -168.467 46 1.37 3.65 10.59 56.05 0.25 Chukchi Sea 69.25 -169.367 53 1.46 10.90 8.38 147.01 0.28 Chukchi Sea 69.267 -167.467 47 1.26 7.00 24.50 258.20 0.12 Chukchi Sea 69.267 -166.467 35 0.76 8.21 35.76 173.86 0.19 Chukchi Sea 68.733 -167.5 46 0.92 7.30 14.93 146.75 0.20 Chukchi Sea 68.733 -169.5 55 1.19 2.34 30.58 146.43 0.08 Chukchi Sea 67.217 -168.533 43 0.77 3.37 23.81 116.25 0.13 Gulf of Alaska 60.37 -146.892 285 0.62 0.21 9.50 47.20 0.02 Chukchi Sea 67.09 -164.483 28 0.83 8.65 10.43 128.24 0.26 Chukchi Sea 67.383 -165.392 36 0.97 3.32 42.31 117.92 0.13 Chukchi Sea 67.3 -166.083 38 0.82 6.77 68.39 259.94 0.12 Chukchi Sea 66.833 -166.567 29 0.35 1.38 29.77 76.46 0.08 Chukchi Sea 67.392 -167.333 44 0.76 0.53 2.98 16.69 0.14 Chukchi Sea 67.992 -166.975 57 0.57 2.48 18.11 139.32 0.08 Chukchi Sea 67.55 -168.008 47 0.84 0.00 3.55 37.81 0.00 Chukchi Sea 67.917 -167.6 54 0.35 2.35 15.06 114.86 0.09 Chukchi Sea 68.867 -168.25 51 1.21 8.54 14.60 189.57 0.19 Chukchi Sea 69.683 -170.25 53 1.12 10.04 34.38 86.45 0.37 Chukchi Sea 68.867 -170.817 56 0.96 0.75 8.30 81.41 0.05 Bering Sea 60.383 -177.433 144 1.22 1.93 36.68 147.00 0.06 Bering Sea 61.023 -170.255 50 0.43 1.41 11.74 116.16 0.06 Bering Sea 62.53 -172.865 60 0.27 0.00 4.40 14.64 0.00 Bering Sea 61.867 -172.583 61 0.96 2.45 13.04 78.70 0.14 Bering Sea 62.668 -174.365 73 1.21 0.66 9.31 31.84 0.10 Bering Sea 61.8 -175.433 89 0.95 1.31 102.15 98.38 0.06 Chukchi Sea 67.578 -169.148 52 0.95 1.97 6.95 54.21 0.16 Bering Sea 61.858 -170.2 48 0.55 4.17 26.12 104.63 0.17 Bering Sea 60.138 -173.908 94 1.50 0.19 6.83 59.71 0.02 Bering Sea 59.448 -171.9 80 0.67 0.78 34.59 64.28 0.06 Bering Sea 57.575 -166.797 68 0.34 0.19 56.45 147.11 0.01 Bering Sea 56.91 -165.14 72 0.41 0.15 12.88 84.04 0.01 Bering Sea 55.6 -165.288 111 0.65 0.30 49.43 147.62 0.01 Bering Sea 60.032 -175.145 114 1.19 0.95 16.03 76.54 0.06 Bering Sea 57.453 -171.483 100 0.51 0.00 15.83 136.24 0.00 Bering Sea 58.707 -169.523 66 0.35 0.68 30.12 122.89 0.03 Bering Sea 56.763 -167.742 97 0.55 0.15 7.95 39.74 0.02 Gulf of Alaska 54.01 -154.787 4575 0.37 0.00 14.55 46.83 0.00 Gulf of Alaska 50.387 -139.257 3774 0.53 0.00 0.85 3.97 0.00 Gulf of Alaska 51.633 -139.203 3707 3.88 0.07 1.43 5.75 0.06 Labrador Sea 61.4636 -58.0358 2668 0.16 0.00 19.67 29.64 0.00 Davis Strait 64.3931 -58.1347 857 1.17 0.62 9.37 14.56 0.18 Baffin Bay 68.6665 -60.0000 1479 0.21 45.55 9.63 28.80 0.89 Baffin Bay 70.4618 -64.6574 2060 0.28 119.15 5.48 22.84 0.96 Baffin Bay 75.4687 -70.6346 602 0.63 31.78 19.30 44.99 0.78 NOW 77.2879 -74.3427 728 0.23 261.99 201.76 477.14 0.74 NOW 76.9788 -71.8905 1048 0.57 332.73 122.44 227.25 0.88 NOW 76.3287 -71.4211 696 0.69 251.77 141.52 261.26 0.83 NOW 76.573 -73.9554 680 0.84 41.74 149.23 415.61 0.34 Jones Sound 75.5793 -78.6296 580 0.70 174.02 77.69 173.77 0.84 Lancaster Sound 74.0231 -77.1163 870 0.43 347.26 121.04 201.12 0.90 Lancaster Sound 74.092 -78.7186 866 1.30 58.44 44.12 67.53 0.82 Baffin Bay 72.4063 -67.7167 2375 0.11 166.44 75.97 224.51 0.79 Baffin Bay 72.4345 -67.8782 2357 0.14 117.17 13.21 44.36 0.93 Baffin Bay 68.2281 -57.6181 437 1.63 6.17 69.33 55.05 0.36 Gaspe Bay 48.8133 -64.3465 65 0.59 6.05 35.62 204.27 0.13 Gaspe Bay 48.7744 -64.2740 87 1.12 2.13 32.56 216.84 0.05 Gaspe Bay 48.7744 -64.3409 87 0.84 1.63 37.64 228.17 0.04 Chaleur Bay 47.9077 -65.2741 69 0.42 9.51 168.88 678.35 0.07 Chaleur Bay 47.9055 -65.2676 68.8 0.33 13.81 310.00 1151.51 0.06 Chaleur Bay 47.9328 -65.1691 73.5 0.32 12.77 140.93 328.75 0.17 Hudson Bay 60.5 -85 194 2.80 0.17 0.31 3.40 0.20 Hudson Bay 60.8386 -87.4493 204 1.70 26.49 2.17 18.33 0.88 Hudson Bay 60.9183 -91.7766 120 1.11 64.30 30.49 93.08 0.78 Hudson Bay 65.1448 -81.3450 445 3.87 8.29 2.89 3.32 0.93 Hudson Bay 60.15 -79.0011 129 0.26 87.58 25.60 454.97 0.50 Hudson Bay 60.3363 -81.9998 156 1.27 19.85 3.95 43.03 0.70