# North Atlantic Heinrich Layer 1 Geochemical and Stable Isotope Data #----------------------------------------------------------------------- # World Data Service for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program # National Centers for Environmental Information (NCEI) #----------------------------------------------------------------------- # Template Version 3.0 # Encoding: UTF-8 # 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: https://www.ncdc.noaa.gov/paleo/study/24670 # Description: NOAA Landing Page # Online_Resource: https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hodell2017/hodell2017u1308ird.txt # Description: NOAA location of the template # # Original_Source_URL: # Description: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: Paloeceanography # # Dataset DOI: # # Parameter_Keywords: oxygen isotopes, carbon isotopes, geochemistry, physical properties #-------------------- # Contribution_Date # Date: 2018-07-17 #-------------------- # File_Last_Modified_Date # Date: 2018-07-17 #-------------------- # Title # Study_Name: North Atlantic Heinrich Layer 1 Geochemical and Stable Isotope Data #-------------------- # Investigators # Investigators: Hodell, D.A.; Nicholl, J.A.; Bontognali, T.R.R.; Danino, S.; Dorador, J.; Dowdeswell, J.A.; Einsle, J.; Kuhlmann, H.; Martrat, B.; Mleneck-Vautravers, M.J.; Rodríguez-Tovar, F.J.; Röhl , U. #-------------------- # Description_Notes_and_Keywords # Description: Sediment XRF, IRD, and stable isotope data from North Atlantic core U1308 through Heinrich Layer 1 (~16-14ka). #-------------------- # Publication # Authors: David A. Hodell, Joseph A. Nicholl, Tomaso R.R. Bontognali, Steffan Danino, Javier Dorador, Julian A. Dowdeswell, Joshua Einsle, Holger Kuhlmann, Belen Martrat, Maryline J. Mleneck-Vautravers, Francisco Javier Rodríguez-Tovar, Ursula Röhl # Published_Date_or_Year: 2017-03-01 # Published_Title: Anatomy of Heinrich Layer 1 and its role in the last deglaciation # Journal_Name: Paleoceanography and Paleoclimatology # Volume: 32 # Edition: # Issue: 3 # Pages: 284-303 # Report_Number: # DOI: 10.1002/2016PA003028 # Online_Resource: https://agupubs.onlinelibrary.wiley.com/doi/10.1002/2016PA003028 # Full_Citation: # Abstract: X-ray fluorescence (XRF) core scanning and X-ray computed tomography data were measured every 1 mm to study the structure of Heinrich Event 1 during the last deglaciation at International Ocean Discovery Program Site U1308. Heinrich Layer 1 comprises two distinct layers of ice-rafted detritus (IRD), which are rich in detrital carbonate (DC) and poor in foraminifera. Each DC layer consists of poorly sorted, coarse-grained clasts of IRD embedded in a dense, fine-grained matrix of glacial rock flour that is partially cemented. The radiocarbon ages of foraminifera at the base of the two layers indicate a difference of 1400 14C years, suggesting that they are two distinct events, but the calendar ages depend upon assumptions made for surface reservoir ages. The double peak indicates at least two distinct stages of discharge of the ice streams that drained the Laurentide Ice Sheet through Hudson Strait during HE1 or, alternatively, the discharge of two independent ice streams containing detrital carbonate. Heinrich Event 1.1 was the larger of the two events and began at ~16.2 ka (15.5-17.1 ka) when the polar North Atlantic was already cold and Atlantic Meridional Overturning Circulation (AMOC) weakened. The younger peak (H1.2) at ~15.1 ka (14.3 to 15.9 ka) was a weaker event than H1.1 that was accompanied by minor cooling. Our results support a complex history for Heinrich Stadial 1 (HS1) with reduction in AMOC during the early part (~20-16.2 ka) possibly driven by melting of European ice sheets, whereas the Laurentide Ice Sheet assumed a greater role during the latter half (~16.2-14.7 ka). #------------------ # Funding_Agency # Funding_Agency_Name: UK Natural Environmental Research Council (NERC) # Grant: #------------------ # Site_Information # Site_Name: U1308 # Location: Ocean>Atlantic Ocean>North Atlantic Ocean # Country: # Northernmost_Latitude: 49.8778 # Southernmost_Latitude: 49.8778 # Easternmost_Longitude: -24.2383 # Westernmost_Longitude: -24.2383 # Elevation: -3883 m #------------------ # Data_Collection # Collection_Name: Hodell2017U1308IRD # Earliest_Year: 17446 # Most_Recent_Year: 13705 # Time_Unit: Cal. Year BP # Core_Length: # Notes: #------------------ # Chronology_Information # Chronology: # # U1308A Radiocarbon dates # Laboratory Laboratory ID Hole-Core-Section Depth Species fraction ± D14C ± 14C years ± # (cm) (uncorrected) # KCCAMS 180648 U1308A-1H-1 78.25 N. pachyderma (s) 0.2000 0.0007 -800.0 0.7 12930 30 # KCCAMS 180649 U1308A-1H-1 78.25 G. bulloides 0.2135 0.0007 -786.5 0.7 12405 25 # KCCAMS 180650 U1308A-1H-1 80.25 N. pachyderma (s) 0.1874 0.0008 -812.6 0.8 13450 40 # KCCAMS 180651 U1308A-1H-1 80.25 G. bulloides 0.2065 0.0006 -793.5 0.6 12675 25 # KCCAMS 180652 U1308A-1H-1 81.75 N. pachyderma (s) 0.1827 0.0006 -817.3 0.6 13655 30 # KCCAMS 180653 U1308A-1H-1 81.75 G. bulloides 0.2028 0.0007 -797.2 0.7 12815 30 # SUERC 1517.1010 U1308A-1H-1 82.75 N. pachyderma (s) 0.1897 0.0010 13355 42 # KCCAMS 180655 U1308A-1H-1 85.25 G. bulloides 0.2036 0.0006 -796.4 0.6 12785 30 # KCCAMS 180654 U1308A-1H-1 85.75 N. pachyderma (s) 0.1927 0.0006 -807.3 0.6 13230 30 # KCCAMS 180656 U1308A-1H-1 86.75 N. pachyderma (s) 0.1769 0.0007 -823.1 0.7 13915 30 # SUERC 1517.1010 U1308A-1H-1 88.75 N. pachyderma (s) 0.1592 0.0009 14762 45 # KCCAMS 180657 U1308A-1H-1 91.25 N. pachyderma (s) 0.1374 0.0006 -862.6 0.6 15945 35 # # # Combined Radiocarbon dates # Depth in Section 1308A-1H-1 depth in 609 Radiocarbon age error Reference Reservoir Correction # (cm) (cm) 14C years (uncorrected) ± (years) # 69.6 64 12380 120 Bond et al. (1992) 360 # 70.184 65 11580 190 Bond et al. (1992) 390 # 72.965 69.5 11420 190 Bond et al. (1992) 390 # 78.25 12930 30 this study 230 # 79.258 74 12750 220 Bond et al. (1992) 130 # 80.25 13450 40 this study 130 # 81.75 13655 30 this study 245 # 82.056 76 13890 220 Bond et al. (1992) 150 # 82.75 13355 42 this study 150 # 85.75 13230 30 this study 180 # 86.75 13915 30 this study 150 # 88.75 14762 45 this study 720 # 91.25 15945 35 this study 750 # 91.603 84.5 14990 230 Bond et al. (1992) 720 # 94.305 87.5 16360 240 Bond et al. (1992) 440 # 94.305 90.5 16760 150 Bond et al. (1992) 320 # 104.87 98.5 17360 120 Bond et al. (1992) 260 # 112.08 106 19340 220 Bond et al. (1992) -130 # 117.35 110.5 20370 330 Bond et al. (1992) -340 # 118.585 111.5 20950 260 Bond et al. (1992) 40 # 119.82 112.5 21510 220 Bond et al. (1992) 230 # 123.26 115.5 21770 220 Bond et al. (1992) 230 # 127.05 119 22780 340 Bond et al. (1992) 190 # 142.5 139 25660 440 Bond et al. (1992) 300 # # #---------------- # Variables # # Data variables follow are preceded by "##" in columns one and two. # Data line variables format: one per line, shortname-tab-variable components (what, material, error, units, seasonality, data type,detail, method, C or N for Character or Numeric data, free text) # ## Site Site,,,,,,,,C, ## Hole Hole,,,,,,,,C, ## Core Core,,,,,,,,C, ## Type Type,,,,,,,,C, ## Section Section,,,,,,,,C, ## depth_top depth, , , m, , , Top Interval, ,N, ## depth_bot depth, , , m, , , bottom Interval, ,N, ## depth_m depth, , , m, , , , ,N, ## age_min age, , , calendar years before present, , , minimum age, ,N, ## age_max age, , , calendar years before present, , , maximum age, ,N, ## age_med age, , , calendar years before present, , , median age, ,N, ## age_mean age, , , calendar years before present, , , mean age, ,N, ## forams Forams (non-Pachy), sediment, , count, ,paleoceanography, ,,N, ## N.pachy N.pachyderma, sediment, , count, ,paleoceanography, ,,N, ## detCarb Detrital Carbonate, sediment, , count, ,paleoceanography, ,,N, ## otherIRD Other IRD, sediment, , count, ,paleoceanography, ,,N, ## lithics Total lithics, sediment, , count, ,paleoceanography, ,,N, ## totforams Total Forams, sediment, , count, ,paleoceanography, ,,N, ## totgrains Total grains, sediment, , count, ,paleoceanography, ,,N, ## %IRD %IRD, sediment, , percent, ,paleoceanography, ,,N, ## %N.pachy N.pachyderma, sediment, , percent, ,paleoceanography, ,,N, ## %detCarb Detrital Carbonate, sediment, , percent, ,paleoceanography, ,,N, # #---------------- # Data: # Data lines follow (have no #) # Data line format - tab-delimited text, variable short name as header # Missing Values: # Site Hole Core Type Section depth_top depth_bot depth_m age_min age_max age_med age_mean forams N.pachy detCarb otherIRD lithics totforams totgrains %IRD %N.pachy %detCarb U1308 A 1 H 1 78 78.5 78.25 12757.3 14756.6 13663 13705.1 270 55 10 213 223 325 548 40.693 16.923 4.4843 U1308 A 1 H 1 78.5 79 78.75 13699.1 15322.8 14505.1 14509 296 55 6 193 199 351 550 36.182 15.67 3.0151 U1308 A 1 H 1 79 79.5 79.25 13778.4 15472.5 14620.2 14624 242 67 17 232 249 309 558 44.624 21.683 6.8273 U1308 A 1 H 1 79.5 80 79.75 13833.7 15640.1 14732.6 14738.8 200 68 17 188 205 268 473 43.34 25.373 8.2927 U1308 A 1 H 1 80 80.5 80.25 13954.1 15753 14838.5 14846.4 296 76 27 334 361 372 733 49.25 20.43 7.4792 U1308 A 1 H 1 80.5 81 80.75 14113.3 15800.9 14939.5 14945.8 221 124 27 515 542 345 887 61.105 35.942 4.9815 U1308 A 1 H 1 81 81.5 81.25 14244.6 15853.9 15042.2 15045.7 74 49 14 215 229 123 352 65.057 39.837 6.1135 U1308 A 1 H 1 81.5 82 81.75 14363.7 15913.5 15150.5 15147.5 58 38 34 297 331 96 427 77.518 39.583 10.272 U1308 A 1 H 1 82 82.5 82.25 14460.8 15991.9 15258.2 15249.2 131 74 49 330 379 205 584 64.897 36.098 12.929 U1308 A 1 H 1 82.5 83 82.75 14541.5 16083.6 15368.3 15349.5 U1308 A 1 H 1 83 83.5 83.25 14617.1 16182.3 15472.9 15449.4 201 96 12 156 168 297 465 36.129 32.323 7.1429 U1308 A 1 H 1 83.5 84 83.75 14675.5 16299.5 15573.5 15550.3 227 47 6 139 145 274 419 34.606 17.153 4.1379 U1308 A 1 H 1 84 84.5 84.25 14729.4 16448.5 15670.9 15650.9 186 63 4 105 109 249 358 30.447 25.301 3.6697 U1308 A 1 H 1 84.5 85 84.75 14782.7 16618.5 15765.1 15751.3 244 73 6 131 137 317 454 30.176 23.028 4.3796 U1308 A 1 H 1 85 85.5 85.25 14885.7 16732.1 15859.4 15850.5 432 122 8 176 184 554 738 24.932 22.022 4.3478 U1308 A 1 H 1 85.5 86 85.75 15032.3 16793.6 15949.9 15947.5 116 72 15 159 174 188 362 48.066 38.298 8.6207 U1308 A 1 H 1 86 86.5 86.25 15183.2 16874.7 16044.2 16045.4 72 51 45 342 387 123 510 75.882 41.463 11.628 U1308 A 1 H 1 86.5 87 86.75 15307.6 16953.6 16140.7 16144 17 18 59 371 430 35 465 92.473 51.429 13.721 U1308 A 1 H 1 87 87.5 87.25 15404 17044 16234.2 16241.7 4 24 62 392 454 28 482 94.191 85.714 13.656 U1308 A 1 H 1 87.5 88 87.75 15491.1 17143.8 16333.2 16340.7 2 20 77 364 441 22 463 95.248 90.909 17.46 U1308 A 1 H 1 88 88.5 88.25 15576.4 17265.9 16428.8 16438.2 43 221 33 329 362 264 626 57.827 83.712 9.116 U1308 A 1 H 1 88.5 89 88.75 15647 17409.7 16527.1 16535.5 0 U1308 A 1 H 1 89 89.5 89.25 15715.7 17562.7 16620.4 16633.6 21 243 16 308 324 264 588 55.102 92.045 4.9383 U1308 A 1 H 1 89.5 90 89.75 15781.3 17731.4 16711.6 16731 31 265 15 268 283 296 579 48.877 89.527 5.3004 U1308 A 1 H 1 90 90.5 90.25 15963.8 17864.4 16850.7 16874.7 13 237 4 221 225 250 475 47.368 94.8 1.7778 U1308 A 1 H 1 90.5 91 90.75 16239.8 17962.3 17043.4 17064 50 384 5 198 203 434 637 31.868 88.479 2.4631 U1308 A 1 H 1 91 91.5 91.25 16491.9 18069.9 17239.8 17254.3 42 424 2 153 155 466 621 24.96 90.987 1.2903 U1308 A 1 H 1 91.5 92 91.75 16715.3 18197.4 17432.8 17446.1 30 338 7 147 154 368 522 29.502 91.848 4.5455