# North Atlantic Benthic Foraminifera Stable Isotope Data Over the Past 21,000 Years #----------------------------------------------------------------------- # 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: http://www.ncdc.noaa.gov/paleo/study/17658 # Online_Resource: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010b/thornalley2010b-15-4p-benth.txt # # Archive: Paleoceanography #-------------------- # Contribution_Date # Date: 2015-01-02 #-------------------- # Title # Study_Name: North Atlantic Benthic Foraminifera Stable Isotope Data Over the Past 21,000 Years #-------------------- # Investigators # Investigators: Thornalley, D.J.R.; Elderfield, H. ; McCave, I.N. #-------------------- # Description_and_Notes # Description: Data collected by David J.R. Thornalley (Univ. of Cambridge); Principal Investigator: I. Nick McCave (Univ. of Cambridge); cruise CD-159, funded by UK RAPID program. # Stable isotope values relative to VPDB standard, run in Godwin Laboratory, Univ. of Cambridge. "Ice-volume corrected" for whole ocean changes using Fairbanks (1989) sea-level curve, assuming a LGM to late Holocene shift of 1‰. # RAPiD-12-1K: Vital effect of -0.24 applied to Melonis d18O data. #-------------------- # Publication # Authors: Thornalley, D.J.R., H. Elderfield, and I.N. McCave # Published_Date_or_Year: 2010 # Published_Title: Intermediate and Deep Water Paleoceanography of the Northern North Atlantic Over the Past 21,000 years # Journal_Name: Paleoceanography # Volume: 25 # Issue: 1 # Report Number: PA1211 # DOI: 10.1029/2009PA001833 # Abstract: Benthic foraminiferal stable isotope records from four high-resolution sediment cores, forming a depth transect between 1237 m and 2303 m on the South Iceland Rise, have been used to reconstruct intermediate and deep water paleoceanographic changes in the northern North Atlantic during the last 21 ka (spanning Termination I and the Holocene). Typically, a sampling resolution of ~100 years is attained. Deglacial core chronologies are accurately tied to North Greenland Ice Core Project (NGRIP) ice core records through the correlation of tephra layers and changes in the percent abundance of Neogloboquadrina pachyderma (sinistral) with transitions in NGRIP. The evolution from the glacial mode of circulation to the present regime is punctuated by two periods with low benthic d13C and d18O values, which do not lie on glacial or Holocene water mass mixing lines. These periods correlate with the late Younger Dryas/Early Holocene (11.5–12.2 ka) and Heinrich Stadial 1 (14.7–16.8 ka) during which time freshwater input and sea-ice formation led to brine rejection both locally and as an overflow exported from the Nordic seas into the northern North Atlantic, as earlier reported by Meland et al. (2008). The export of brine with low d13C values from the Nordic seas complicates traditional interpretations of low d13C values during the deglaciation as incursions of southern sourced water, although the spatial extent of this brine is uncertain. The records also reveal that the onset of the Younger Dryas was accompanied by an abrupt and transient (~200–300 year duration) decrease in the ventilation of the northern North Atlantic. During the Holocene, Iceland-Scotland Overflow Water only reached its modern flow strength and/or depth over the South Iceland Rise by 7–8 ka, in parallel with surface ocean reorganizations and a cessation in deglacial meltwater input to the North Atlantic. #-------------------- # Funding_Agency # Funding_Agency_Name: # Grant: #--------------------- # Site_Information # Site_Name: RAPiD-15-4P # Location: North Atlantic Ocean # Country: # Northernmost_Latitude: 62.293 # Southernmost_Latitude: 62.293 # Easternmost_Longitude: -17.134 # Westernmost_Longitude: -17.134 # Elevation: -2133 #------------------ # Data_Collection # Collection_Name: RAPiD-15-4P benthic Th2010b # Earliest_Year: 20352 # Most_Recent_Year: 6029 # Time_Unit: calyr BP # Core_Length: # Notes: Stable isotope values relative to VPDB standard, run in Godwin Laboratory, Univ. of Cambridge. "Ice-volume corrected" for whole ocean changes using Fairbanks (1989) sea-level curve, assuming a LGM to late Holocene shift of 1 ‰ # #------------------ # Chronology: # # #------------------ # Variables # # Data line variables format: one variable 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 ## depth_top depth bottom of sample interval,,,cm,,paleoceanography,,,N ## depth_bot depth top of sample interval,,,cm,,paleoceanography,,,N ## depth_cm depth,,,cm,,,,,N ## age_calkaBP2000 age,,,calendar kyr before 2000AD,,,,,N ## d18Oc.wuell delta 18O,Cibicidoides wuellerstorfi,,per mil VPDB,,paleoceanography,,,N ## d18Oc.wuell-ivc delta 18O,Cibicidoides wuellerstorfi ice-volume corrected,,per mil VPDB,,paleoceanography,,,N ## d13Cc.wuell delta 13C,Cibicidoides wuellerstorfi,,per mil VPDB,,paleoceanography,,,N ## notes notes,,, ,,,,,C #----------------- # Data: # Missing Value: NaN depth_top depth_bot depth_cm age_calkaBP2000 d18Oc.wuell d18Oc.wuell-ivc d13Cc.wuell notes 144 145 144.5 6.079 2.86 2.74 1.34 152 153 152.5 6.416 2.81 2.68 1.21 168 169 168.5 7.089 2.73 2.60 1.23 232 233 232.5 7.515 2.91 2.76 0.97 304 305 304.5 7.993 2.93 2.78 1.08 320 321 320.5 8.100 3.05 2.90 0.47 344 345 344.5 8.259 2.85 2.70 0.61 400 401 400.5 9.152 2.86 2.67 0.83 408 409 408.5 9.336 2.92 2.72 0.80 436 437 436.5 11.043 3.05 2.72 0.75 438 439 438.5 11.182 3.26 2.91 0.85 444 445 444.5 11.509 3.07 2.66 0.87 452 453 452.5 11.703 3.03 2.60 0.60 453 454 453.5 11.750 3.13 2.69 0.52 454 455 454.5 11.797 3.05 2.61 0.61 455 456 455.5 11.843 2.94 2.50 0.56 456 457 456.5 11.890 2.86 2.41 0.44 457 458 457.5 11.937 3.08 2.63 0.56 458 459 458.5 11.984 3.07 2.62 0.55 459 460 459.5 12.031 3.16 2.71 0.60 463 464 463.5 12.258 3.50 3.03 0.68 464 465 464.5 12.345 3.75 3.28 0.66 465 466 465.5 12.432 3.22 2.74 0.63 466 467 466.5 12.519 3.84 3.36 0.75 467 468 467.5 12.606 3.75 3.26 0.73 468 469 468.5 12.693 3.81 3.32 0.57 469 470 469.5 12.780 3.36 2.87 0.51 470 471 470.5 12.814 3.73 3.23 0.43 471 472 471.5 12.849 3.67 3.17 0.61 473 474 473.5 12.917 3.60 3.09 0.77 474 475 474.5 12.951 3.81 3.30 0.56 475 476 475.5 12.986 3.63 3.12 0.75 476 477 476.5 13.020 3.49 2.98 0.55 478 479 478.5 13.260 3.80 3.27 0.69 480 481 480.5 13.450 3.53 2.99 0.78 481 482 481.5 13.537 3.62 3.08 0.84 482 483 482.5 13.592 3.82 3.27 0.70 483 484 483.5 13.616 3.69 3.14 0.94 484 485 484.5 13.640 3.88 3.33 0.84 485 486 485.5 13.664 3.58 3.03 0.77 486 487 486.5 13.688 3.86 3.30 0.61 487 488 487.5 13.715 3.75 3.20 0.75 489 490 489.5 13.774 3.65 3.09 0.70 490 491 490.5 13.803 3.49 2.92 0.75 491 492 491.5 13.833 3.74 3.17 0.73 492 493 492.5 13.862 3.69 3.10 0.89 493 494 493.5 13.892 3.80 3.20 0.67 494 495 494.5 13.921 3.75 3.14 0.59 495 496 495.5 13.951 3.60 2.98 0.78 496 497 496.5 13.980 3.78 3.15 0.79 497 498 497.5 13.990 3.70 3.06 0.95 498 499 498.5 14.000 3.93 3.29 1.07 499 500 499.5 14.010 3.80 3.16 0.91 500 501 500.5 14.020 3.86 3.22 0.90 501 502 501.5 14.045 3.80 3.15 0.80 502 503 502.5 14.070 3.73 3.07 0.82 503 504 503.5 14.095 3.79 3.12 0.85 504 505 504.5 14.120 3.71 3.03 0.90 505 506 505.5 14.184 3.65 2.95 0.87 506 507 506.5 14.249 3.73 3.01 1.01 507 508 507.5 14.313 3.65 2.92 0.66 508 509 508.5 14.378 3.67 2.94 0.81 509 510 509.5 14.442 3.68 2.94 0.85 510 511 510.5 14.507 3.56 2.82 0.83 511 512 511.5 14.571 3.84 3.09 0.69 512 513 512.5 14.636 3.38 2.62 0.52 513 514 513.5 14.700 3.54 2.78 0.66 515 516 515.5 14.872 3.64 2.87 0.54 516 517 516.5 14.959 3.43 2.66 0.38 517 518 517.5 15.045 3.59 2.81 0.41 518 519 518.5 15.131 3.50 2.72 0.42 519 520 519.5 15.217 3.52 2.74 0.38 520 521 520.5 15.303 3.46 2.67 0.60 521 522 521.5 15.390 3.68 2.89 0.62 522 523 522.5 15.476 3.71 2.91 0.50 Possible reworking 523 524 523.5 15.562 3.93 3.13 0.69 Possible reworking 524 525 524.5 15.648 3.55 2.74 0.75 Possible reworking 525 526 525.5 15.734 4.01 3.20 0.80 Possible reworking 526 527 526.5 15.821 3.73 2.91 0.48 Possible reworking 528 529 528.5 15.993 4.04 3.21 0.65 Possible reworking 530 531 530.5 16.166 4.26 3.43 0.89 Possible reworking 532 533 532.5 16.338 4.20 3.36 0.78 Possible reworking 534 535 534.5 16.510 4.23 3.38 0.66 Possible reworking 536 537 536.5 16.683 4.46 3.61 1.26 Possible reworking 538 539 538.5 16.855 4.47 3.61 1.00 Possible reworking 540 541 540.5 17.028 4.49 3.62 1.05 Possible reworking 542 543 542.5 17.200 4.55 3.67 1.00 Possible reworking 544 545 544.5 17.556 4.51 3.59 0.99 550 551 550.5 18.623 4.19 3.25 0.89 554 555 554.5 19.335 4.51 3.56 0.94 556 557 556.5 19.691 4.47 3.51 0.70 558 559 558.5 20.047 4.55 3.58 0.78 560 561 560.5 20.402 4.45 3.48 0.87