Kienast, Markus; MacIntyre, G; Dubois, Nathalie; Higginson, S; Normandeau, Claire; Chazen, S; Herbert, Timothy D (2012): (Table 1) Sea surface temperature reconstruction for eastern equatorial Pacific surface sediment samples [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.827244, Supplement to: Kienast, M et al. (2012): Alkenone unsaturation in surface sediments from the eastern equatorial Pacific: Implications for SST reconstructions. Paleoceanography, 27(1), PA1210, https://doi.org/10.1029/2011PA002254
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Published: 2012 (exact date unknown) • DOI registered: 2014-02-20
Abstract:
Significant uncertainties persist in the reconstruction of past sea surface temperatures in the eastern equatorial Pacific, especially regarding the amplitude of the glacial cooling and the details of the post-glacial warming. Here we present the first regional calibration of alkenone unsaturation in surface sediments versus mean annual sea surface temperatures (maSST). Based on 81 new and 48 previously published data points, it is shown that open ocean samples conform to established global regressions of Uk'37 versus maSST and that there is no systematic bias from seasonality in the production or export of alkenones, or from surface ocean nutrient concentrations or salinity. The flattening of the regression at the highest maSSTs is found to be statistically insignificant. For the near-coastal Peru upwelling zone between 11-15°S and 76-79°W, however, we corroborate earlier observations that Uk'37 SST estimates significantly over-estimate maSSTs at many sites. We posit that this is caused either by uncertainties in the determination of maSSTs in this highly dynamic environment, or by biasing of the alkenone paleothermometer toward El Niño events as postulated by Rein et al. (2005).
Further details:
Calvo, Eva; Pelejero, Carles; Herguera, Juan-Carlos; Palanques, Albert; Grimalt, Joan O (2001): Insolation dependence of the southeastern subtropical Pacific sea surface temperature over the last 400 kyrs. Geophysical Research Letters, 28(12), 2481-2484, https://doi.org/10.1029/2000GL012024
Conte, Maureen H; Sicre, Marie-Alexandrine; Rühlemann, Carsten; Weber, John C; Schulte, Sonja; Schulz-Bull, Detlef E; Blanz, Thomas (2006): Global temperature calibration of the alkenone unsaturation index (UK'37) in surface waters and comparison with surface sediments. Geochemistry, Geophysics, Geosystems, 7, Q02005, https://doi.org/10.1029/2005GC001054
Dubois, Nathalie; Kienast, Markus; Normandeau, Claire; Herbert, Timothy D (2009): Eastern equatorial Pacific cold tongue during the Last Glacial Maximum as seen from alkenone paleothermometry. Paleoceanography, 24(4), PA4207, https://doi.org/10.1029/2009PA001781
Gutièrrez, Dimitri; Bouloubassi, Ioanna; Sifeddine, Abdelfettah; Purca, Sara; Goubanova, Katerina; Graco, Michelle; Field, David; Méjanelle, Laurence; Velazco, Federico; Lorre, Anne; Salvatteci, Renato; Quispe, Daniel; Vargas, Gabriel; Dewitte, Boris; Ortlieb, Luc (2011): Coastal cooling and increased productivity in the main upwelling zone off Peru since the mid-twentieth century. Geophysical Research Letters, 38, L07603, https://doi.org/10.1029/2010GL046324
Horikawa, Keiji; Minagawa, Masao; Murayama, Masafumi; Kato, Yoshihisa; Asahi, Hirofumi (2006): Spatial and temporal sea-surface temperatures in the eastern equatorial Pacific over the past 150 kyr. Geophysical Research Letters, 33(13), L13605, https://doi.org/10.1029/2006GL025948
Koutavas, Athanasios; Sachs, Julian P (2008): Northern timing of deglaciation in the eastern equatorial Pacific from alkenone paleothermometry. Paleoceanography, 23(4), PA4205, https://doi.org/10.1029/2008PA001593
Leduc, Guillaume; Vidal, Laurence; Tachikawa, Kazuyo; Rostek, Frauke; Sonzogni, Corinne; Beaufort, Luc; Bard, Edouard (2007): Moisture transport across Central America as a positive feedback on abrupt climatic changes. Nature, 445, 908-911, https://doi.org/10.1038/nature05578
Liu, Zhonghui; Herbert, Timothy D (2004): High-latitude influence on the eastern equatorial Pacific climate in the early Pleistocene epoch. Nature, 427(6976), 720-723, https://doi.org/10.1038/nature02338
Prahl, Frederick G; Mix, Alan C; Sparrow, Margaret A (2006): Alkenone paleothermometry: Biological lessons from marine sediment records off western South America. Geochimica et Cosmochimica Acta, 70(1), 101-117, https://doi.org/10.1016/j.gca.2005.08.023
Rein, Bert; Lückge, Andreas; Reinhardt, Lutz; Sirocko, Frank; Wolf, Anja; Dullo, Wolf-Christian (2005): El Niño variability off Peru during the last 20,000 years. Paleoceanography, 20(4), PA4003, https://doi.org/10.1029/2004PA001099
Coverage:
Median Latitude: -4.377511 * Median Longitude: -87.907354 * South-bound Latitude: -18.085000 * West-bound Longitude: -135.080000 * North-bound Latitude: 15.710000 * East-bound Longitude: -72.700000
Date/Time Start: 1963-04-05T00:00:00 * Date/Time End: 2009-04-01T00:00:00
Minimum DEPTH, sediment/rock: 0 m * Maximum DEPTH, sediment/rock: 0 m
Event(s):
54-2-PG9 * Latitude: -8.100000 * Longitude: -104.300000 * Location: Eastern Equatorial Pacific * Method/Device: Piston corer (PC)
138-846 * Latitude: -3.095000 * Longitude: -90.818330 * Date/Time Start: 1991-05-21T00:00:00 * Date/Time End: 1991-05-26T00:00:00 * Elevation: -3296.0 m * Penetration: 871.5 m * Recovery: 821.61 m * Location: South Pacific Ocean * Campaign: Leg138 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 92 cores; 865.5 m cored; 0 m drilled; 94.9 % recovery
201-1228 * Latitude: -11.064267 * Longitude: -78.077800 * Date/Time: 2002-03-03T00:00:00 * Elevation: -261.8 m * Penetration: 298.6 m * Recovery: 221.5 m * Location: South Pacific Ocean * Campaign: Leg201 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 36 cores; 294.6 m cored; 4 m drilled; 75.2 % recovery
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Kienast, Markus | |||
| 2 | Longitude of event | Longitude | Kienast, Markus | |||
| 3 | Longitude of event | Longitude | Kienast, Markus | |||
| 4 | DEPTH, sediment/rock | Depth sed | m | Kienast, Markus | Geocode | |
| 5 | Alkenone, unsaturation index UK'37 | UK'37 | Kienast, Markus | |||
| 6 | Sea surface temperature, annual mean | SST (1-12) | °C | Kienast, Markus | interpolated | WOA09 |
| 7 | Sea surface temperature, annual mean | SST (1-12) | °C | Kienast, Markus | Calculated from UK'37 (Prahl et al., 1988) | |
| 8 | Temperature, difference | delta T | °C | Kienast, Markus | ||
| 9 | Reference/source | Reference | Kienast, Markus |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
631 data points