# Southern Ocean 120KYr Nitrogen and Silicon Isotope Data #----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. # If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # # Online_Resource: http://ncdc.noaa.gov/paleo/study/17917 # # Original_Source_URL: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/robinson2014b/robinson2014e17-9.txt # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paleoceanography #-------------------- # Contribution_Date # Date: 2015-01-27 #-------------------- # Title # Study_Name: Southern Ocean 120KYr Nitrogen and Silicon Isotope Data #-------------------- # Investigators # Investigators: Robinson, R.S.; Brzezinski, M.A.; Beucher, C.P.; Horn, M.G.S.; Bedsole, P. #-------------------- # Description_and_Notes # Description: Nitrogen (d15N) and Silicon (d30Si) isotope data measured on diatoms from Southern Ocean sediment cores. #-------------------- # Publication # Authors: Rebecca S. Robinson, Mark A. Brzezinski, Charlotte P. Beucher, Matthew G. S. Horn and Patrick Bedsole # Published_Date_or_Year: 2014-12-01 # Published_Title: The changing roles of iron and vertical mixing in regulating nitrogen and silicon cycling in the Southern Ocean over the last glacial cycle # Journal_Name: Paleoceanography # Volume: 29 # Edition: # Issue: 12 # Pages: 1179-1195 # DOI: 10.1002/2014PA002686 # Online_Resource: http://www.sciencedirect.com/science/article/pii/S0012821X13007280 # Full_Citation: # Abstract: The Southern Ocean plays a critical role in the air-sea CO2 balance through biological and physical mechanisms. Vertical supply of deep waters returns nutrients and CO2 to the surface and stimulates phytoplankton growth. Photosynthesis in the Southern Ocean is limited by iron and only a fraction of the carbon and nutrients that return to the surface are consumed for potential sequestration in the deep sea. Here we present the most spatially extensive data set of silicon and nitrogen isotope measurements from diatom frustules to date to examine the controls on nutrient drawdown during the last glacial period and across the glacial termination in both the Antarctic and Subantarctic zones. The new data confirm existing views that differing silicon and nitrate consumption patterns in the Antarctic zone are likely the result, at least in part, of iron addition during the last glacial maximum (LGM). However, earlier in the glacial, a more coordinated response in the two proxy records, with both reflecting enhanced consumption during episodes of increased iron accumulation and export production, implies a different system response than observed for the LGM. A collapse of the expected equatorward gradient in silicon isotope values and contraction of the nitrogen isotope gradient during the deglaciation suggests that nutrient supply increased not only in the Antarctic Zone, but also in the Subantarctic, perhaps due to enhanced deep mixing locally. Enhanced deep water ventilation across the Southern Ocean likely increased the nutrient content of mode waters during the deglaciation. #------------------ # Funding_Agency # Funding_Agency_Name: US National Science Foundation # Grant: 00752191 #------------------ # Site_Information # Site_Name: E17-9 # Location: Ocean>Pacific Ocean>South Pacific Ocean # Country: # Northernmost_Latitude: -63.1 # Southernmost_Latitude: -63.1 # Easternmost_Longitude: -135.1 # Westernmost_Longitude: -135.1 # Elevation: m #------------------ # Data_Collection # Collection_Name: Robinson2014E17-9 # Earliest_Year: 284500 # Most_Recent_Year: 5950 # Time_Unit: Cal. Year BP # Core_Length: m # Notes: #------------------ # Chronology: # # # #---------------- # Variables # # Data variables follow that are preceded by "##" in columns one and two. # Data line variables format: Variables list, one per line, shortname-tab-longname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) # ##depth_cm depth, , , cm, , , , ,N ##age_calkaBP age, , , calendar Kyears before present, , , , ,N ##d15Ndiat delta 15N, diatoms, , per mil v. air, , , , ,N ##d30Sidiat delta 30Si, diatoms, , per mil v. NBS28, , , , ,N ##d30Sidiatstd delta 30Si Std Deviation, diatoms, , per mil v. NBS28, , , , ,N ##notes Notes-Sample Description,,,,,,,,C # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # E17-9-1PC # depth_cm age_calkaBP d15Ndiat d30Sidiat d30Sidiatstd notes 2 5.95 3.1 3 6.16 5.1 1.2 0.056568542 E17-9-1PC 3-4cm 16 8.88 4.4 1.4 0.070710678 E17-9-1PC 16-17cm 25 10.76 5.5 1.38 0.014142136 E17-9-1PC 25-26cm 35 12.84 6.7 1.42 0.042426407 E17-9-1PC 35-36cm 46 15.14 5.5 1.195 0.077781746 E17-9-1PC 46-47cm 56 17.23 4.9 1.18 0.028284271 E17-9-1PC 56-57cm 66 19.35 6.9 0.93 0.028284271 E17-9-1PC 66-67cm 76 20.8 5.6 1.01 0.014142136 E17-9-1PC 76-77cm 89 21.83 6.2 1.045 0.035355339 E17-9-1PC 89-90cm 110 23.49 4 E17-9-1PC 110-111cm 119 24.2 4.7 1.02 0.014142136 E17-9-1PC 119-120cm 129 24.98 4 E17-9-1PC 129-130cm 132 25.22 5 0.98 0.014142136 E17-9-1PC 132-133cm 139 25.77 3 E17-9-1PC 139-140cm 148 26.48 3.7 1.17 0.070710678 E17-9-1PC 148-149cm 158 27.27 4.7 1.1 0.070710678 E17-9-1PC 158-159cm 168 28.06 4.3 1.115 0.021213203 E17-9-1PC 168-169cm 179 28.93 E17-9-1PC 179-180cm 190 29.79 3 E17-9-1PC 190-191cm 199 30.5 E17-9-1PC 199-200cm 209 31.29 3.5 E17-9-1PC 209-210cm 218 32 3.2 E17-9-1PC 218-219cm 228 32.79 4.7 1.07 0.014142136 E17-9-1PC 228-229cm 249 34.69 1.11 0.042426407 E17-9-1PC 249-250cm 258 35.5 1.16 0.042426407 E17-9-1PC 258-259cm 268 36.4 3.3 0.995 0.035355339 E17-9-1PC 268-269cm 278 37.7 3.7 E17-9-1PC 278-279cm 296 41.3 5.5 1.015 0.007071068 E17-9-1PC 296-298cm 318 46.8 6 1.025 0.06363961 E17-9-1PC 318-319cm 329 49.5 4 E17-9-1PC 329-330cm 338 51.8 4.8 1.04 0.056568542 E17-9-1PC 338-339cm 349 54.5 2.6 E17-9-1PC 349-350cm 358 56.8 3.3 0.935 0.049497475 E17-9-1PC 358-359cm 368 59.3 5.3 0.975 0.077781746 E17-9-1PC 368-369cm 378 61.8 4 E17-9-1PC 378-380cm 389 64.5 4 E17-9-1PC 389-390cm 400 67.3 4 1.09 0.042426407 E17-9-1PC 400-402cm 410 69.8 4.6 1.155 0.007071068 E17-9-1PC 410-411cm 428 74.3 3.5 1.065 0.035355339 E17-9-1PC 428-429cm 448 79.3 2.6 0.94 0.056568542 E17-9-1PC 448-449cm 457 81.5 3.7 E17-9-1PC 457-459cm 469 84.5 4.9 1.11 E17-9-1PC 469-470cm 489 89.5 4.4 1.2 E17-9-1PC 489-490cm 498 91.8 4.6 1.2 E17-9-1PC 498-499cm 509 94.5 5 1.08 E17-9-1PC 509-510cm 519 97 3.3 E17-9-1PC 519-520cm 529 99.5 4.5 1.07 E17-9-1PC 529-530cm 540 102.3 1.8 E17-9-1PC 540-542cm 549 104.5 1.6 E17-9-1PC 549-550cm 557 106.5 2.1 E17-9-1PC 557-558cm 567 109 4 E17-9-1PC 567-568cm 579 112 4.6 E17-9-1PC 579-580cm 589 114.5 3.9 E17-9-1PC 589-590 cm 597 116.5 2.7 E17-9-1PC 597-598cm 609 119.5 4.2 E17-9-1PC 609-610cm 618 121.8 3 E17-9-1PC 618-619cm 629 124.5 1.8 E17-9-1PC 629-630cm 649 129.5 2.5 E17-9-1PC 649-650cm 659 132 2.8 E17-9-1PC 659-660cm 679 137 5.9 E17-9-1PC 679-680cm 697 141.5 4.8 E17-9-1PC 697-698cm 708 144.3 4.4 E17-9-1PC 708-709cm 718 146.8 4.1 E17-9-1PC 718-720cm 729 149.5 5 E17-9-1PC 729-730cm 739 152 3.5 E17-9-1PC 739-740cm 758 156.8 5.2 E17-9-1PC 758-759cm 768 159.3 4.8 E17-9-1PC 768-769cm 777 161.5 3.8 E17-9-1PC 777-778cm 788 164.3 2.8 E17-9-1PC 788-789cm 799 167 4.2 E17-9-1PC 799-800cm 808 169.3 3.5 E17-9-1PC 808-809cm 829 174.5 5.4 E17-9-1PC 829-830cm 837 176.5 4.5 E17-9-1PC 837-838cm 869 184.5 3.7 E17-9-1PC 869-870cm 889 189.5 3.8 E17-9-1PC 889-890cm 896 191.3 3.6 E17-9-1PC 896-897cm 919 197 3.9 E17-9-1PC 919-920cm 929 199.5 2.9 E17-9-1PC 929-930cm 939 202 2 E17-9-1PC 939-940cm 948 204.3 3.6 E17-9-1PC 948-949cm 970 209.8 3.6 E17-9-1PC 970-971cm 978 211.8 4.3 E17-9-1PC 978-979cm 1017 221.5 4.2 E17-9-1PC 1017-1018cm 1039 227 3 E17-9-1PC 1039-1040cm 1057 231.5 5.4 E17-9-1PC 1057-1058cm 1089 239.5 3 E17-9-1PC 1089-1090cm 1099 242 4.3 E17-9-1PC 1099-1101cm 1110 244.8 3.6 E17-9-1PC 1110-1111cm 1129 249.5 3.2 E17-9-1PC 1129-1130cm 1139 252 4 E17-9-1PC 1139-1140cm 1150 254.8 4.1 E17-9-1PC 1150-1151cm 1160 257.3 4.6 E17-9-1PC 1160-1161cm 1169 259.5 4.2 E17-9-1PC 1169-1170cm 1179 262 3 E17-9-1PC 1179-1180cm 1190 264.8 3.1 E17-9-1PC 1190-1191cm 1200 267.3 3.2 E17-9-1PC 1200-1201cm 1209 269.5 4.2 E17-9-1PC 1209-1210cm 1230 274.8 4 E17-9-1PC 1230-1231cm 1240 277.3 4.7 E17-9-1PC 1240-1241cm 1249 279.5 4 E17-9-1PC 1249-1250cm 1259 282 2.7 E17-9-1PC 1259-1260cm 1269 284.5 4 E17-9-1PC 1269-1270cm