Kreitz, Scott F; Herbert, Timothy D; Schuffert, Jeffrey D (2000): (Table 1) Alkenone concentration, UK'37 index and derived sea surface temperatures for ODP Site 167-1020 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.793496, Supplement to: Kreitz, SF et al. (2000): Alkenone paleothermometry and orbital-scale changes in sea-surface temperature at Site 1020 northern California margin. In: Lyle, M; Koizumi, I; Richter, C; Moore, TC Jr (eds.) Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 167, 1-9, https://doi.org/10.2973/odp.proc.sr.167.213.2000
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Abstract:
Uk'37 sea-surface temperature (SST) estimates obtained at ~2.5-k.y. resolution from Ocean Drilling Program Site 1020 show glacial-interglacial cyclicity with an amplitude of 7°-10°C over the last 780 k.y. This record shows a similar pattern of variability to another alkenone-based SST record obtained previously from the Santa Barbara Basin. Both records show that oxygen isotope Stage (OIS) 5.5 was warmer by ~3°C relative to the present and that glacial Uk'37 temperatures warm in advance of deglaciation, as inferred from benthic d18O records. The alkenone-based SST record at Site 1020 is longer than previously published work along the California margin. We show that warmer than present interglacial stages have occurred frequently during the last 800 k.y. Alkenone concentrations, a proxy for coccolithophorid productivity, indicate that sedimentary marine organic carbon content has also varied significantly over this interval, with higher contents during interglacial periods. A baseline shift to warmer SST and greater alkenone content occurs before OIS 13.
We compare our results with those from previous multiproxy studies in this region and conclude that SST has increased by ~5°C since the last glacial period (21 ka). Our data show that maximum alkenone SSTs occur simultaneously with minimum ice volume at Site 1020, which is consistent with data from farther south along the margin. The presence of sea ice in the glacial northeast Pacific, the extent of which is inferred from locations of ice-rafted debris, provides further support for our notion of cold surface water within the northern California Current system, averaging 7°-8°C cooler during peak glacial conditions. The cooling of surface water during glacial stages most likely did not result from enhanced upwelling because alkenone concentrations and terrestrial redwood pollen assemblages are consistently lower during glacial periods.
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 41.008500 * Longitude: -126.434000
Date/Time Start: 1996-06-08T00:00:00 * Date/Time End: 1996-06-12T00:00:00
Minimum DEPTH, sediment/rock: 0.25 m * Maximum DEPTH, sediment/rock: 84.80 m
Event(s):
167-1020 * Latitude: 41.008500 * Longitude: -126.434000 * Date/Time Start: 1996-06-08T00:00:00 * Date/Time End: 1996-06-12T00:00:00 * Elevation: -3039.0 m * Penetration: 678.2 m * Recovery: 678.2 m * Location: North Pacific Ocean * Campaign: Leg167 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 73 cores; 678.2 m cored; 0 m drilled; 100% recovery
Comment:
Sediment depth is given in mcd.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Sample code/label | Sample label | Kreitz, Scott F | DSDP/ODP/IODP sample designation | ||
| 2 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 3 | Alkenone, unsaturation index UK'37 | UK'37 | Kreitz, Scott F | method see Herbert et al. (1998, doi:10.1029/98PA00069) | ||
| 4 | Sea surface temperature, annual mean | SST (1-12) | °C | Kreitz, Scott F | Calculated from C37 alkenones | |
| 5 | Alkenone, C37 | K37 | nmol/g | Kreitz, Scott F | sum of the C37:2, C37:3, and C37:4 |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
1528 data points