Paul, Hilary; Bernasconi, Stefano M; Schmid, Daniel W; McKenzie, Judith A (2001): (Table 1) Oxygen isotopic composition of interstitial waters from ODP Hole 161-976 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.711003, Supplement to: Paul, H et al. (2001): Oxygen isotopic composition of the Mediterranean Sea since the Last Glacial Maximum: constraints from pore water analyses. Earth and Planetary Science Letters, 192(1), 1-14, https://doi.org/10.1016/S0012-821X(01)00437-X
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Abstract:
Interstitial waters recovered from Ocean Drilling Program, Leg 161, site 976 in the western Mediterranean Sea are used in conjunction with a numerical model to constrain the delta18O of seawater in the basin since the Last Glacial Maximum, including Sapropel Event 1. To resolve the oxygen isotopic composition of the deep Mediterranean, we use a model that couples fluid diffusion with advective transport, thus producing a profile of seawater delta18O variability that is unaffected by glacial-interglacial variations in marine temperature. Comparing our reconstructed seawater delta18O to recent determinations of 1.0 per mil for the mean ocean change in glacial-interglacial delta18O due to the expansion of global ice volume, we calculate an additional 0.2 per mil increase in Mediterranean delta18O caused by local evaporative enrichment. This estimate of delta18O change, due to salinity variability, is smaller than previous studies have proposed and demonstrates that Mediterranean records of foraminiferal calcite delta18O from the last glacial period include a strong temperature component. Paleotemperatures determined in combination with a stacked record of foraminiferal calcite depict almost 9°C of regional cooling for the Last Glacial Maximum. Model results suggest a decrease of ~1.1 per mil in seawater delta18O relative to the modern value caused by increased freshwater input and reduced salinity accompanying the formation of the most recent sapropel. The results additionally indicate the existence of isotopically light water circulating down to bottom water depths, at least in the western Mediterranean, supporting the existence of an 'anti-estuarine' thermohaline circulation pattern during Sapropel Event 1.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 36.205367 * Longitude: -4.312667
Date/Time Start: 1995-05-21T00:00:00 * Date/Time End: 1995-06-08T00:00:00
Minimum DEPTH, sediment/rock: 1.28 m * Maximum DEPTH, sediment/rock: 226.31 m
Event(s):
161-976 * Latitude: 36.205367 * Longitude: -4.312667 * Date/Time Start: 1995-05-21T00:00:00 * Date/Time End: 1995-06-08T00:00:00 * Elevation: -1108.0 m * Penetration: 2080.6 m * Recovery: 977.3 m * Location: Alboran Sea * Campaign: Leg161 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 179 cores; 1536.8 m cored; 0 m drilled; 63.6% recovery
Comment:
See Bernasconi (1999, doi:10.2973/odp.proc.sr.161.228.1999) for extended low-resolution records. Data reported here with +0.1 per mil to compensate for -0.1 per mil offset in measurements prior to 2nd IAEA Interlaboratory Calibration, July 1999.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Sample code/label | Sample label | Paul, Hilary | DSDP/ODP/IODP sample designation | ||
| 3 | Salinity | Sal | Paul, Hilary | |||
| 4 | δ18O, water | δ18O H2O | ‰ SMOW | Paul, Hilary | ||
| 5 | Chloride | Cl- | mmol/l | Paul, Hilary |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
76 data points
Data
| 1 Depth sed [m] | 2 Sample label | 3 Sal | 4 δ18O H2O [‰ SMOW] | 5 Cl- [mmol/l] |
|---|---|---|---|---|
| 1.28 | 161-976D-1H-1,128-133 | 40.0 | 1.46 | 619 |
| 4.45 | 161-976D-2H-2,145-150 | 38.0 | 1.46 | 614 |
| 7.45 | 161-976D-2H-4,145-150 | 36.0 | 1.44 | 610 |
| 10.45 | 161-976D-2H-6,145-150 | 36.0 | 1.39 | 610 |
| 13.95 | 161-976D-3H-2,145-150 | 36.0 | 1.43 | 614 |
| 16.95 | 161-976D-3H-4,145-150 | 35.5 | 1.43 | 614 |
| 18.45 | 161-976D-3H-5,145-150 | 36.0 | 1.39 | 616 |
| 20.45 | 161-976D-3H-7,45-50 | 35.0 | 1.45 | 618 |
| 23.45 | 161-976D-4H-2,145-150 | 34.5 | 1.49 | 610 |
| 26.45 | 161-976D-4H-4,145-150 | 34.5 | 1.50 | 616 |
| 27.95 | 161-976D-4H-5,145-150 | 34.5 | 1.52 | 619 |
| 29.45 | 161-976D-4H-6,145-150 | 34.0 | 1.53 | 616 |
| 43.45 | 161-976C-5H-6,145-150 | 35.0 | 1.51 | 620 |
| 49.95 | 161-976C-6H-4,145-150 | 35.0 | 1.50 | 620 |
| 68.95 | 161-976C-8H-4,145-150 | 35.0 | 1.29 | 632 |
| 84.00 | 161-976B-10H-3,150-155 | 35.0 | 1.22 | 628 |
| 112.45 | 161-976B-13H-3,145-150 | 36.0 | 0.96 | 645 |
| 169.57 | 161-976B-19X-3,145-150 | 38.5 | 0.75 | 694 |
| 226.31 | 161-976B-25X-3,140-150 | 42.0 | 0.58 | 747 |