Steinke, Stephan; Mohtadi, Mahyar; Groeneveld, Jeroen; Lin, Li-Chuan; Löwemark, Ludvig; Chen, Min-Te; Rendle-Bühring, Rebecca (2010): (Table 1) Age determination of sediment core MD01-2390 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.831542, Supplement to: Steinke, S et al. (2010): Reconstructing the southern South China Sea upper water column structure since the Last Glacial Maximum: Implications for the East Asian winter monsoon development. Paleoceanography, 25(2), PA2219, https://doi.org/10.1029/2009PA001850
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Abstract:
Upper water column dynamics in the southern South China Sea were reconstructed in order to track changes in the activity of the East Asian winter monsoon (EAWM) since the Last Glacial Maximum. We used the difference in the stable oxygen isotopes (Delta d18O) and Mg/Ca-based temperatures (Delta T) of surface-dwelling (G. ruber) and thermocline-dwelling (P. obliquiloculata) planktonic foraminifera and the temperature difference between alkenone- and P. obliquiloculata Mg/Ca-based temperatures to estimate the upper ocean thermal gradient at International Marine Past Global Change Study (IMAGES) core MD01-2390. Estimates of the upper ocean thermal gradient were used to reconstruct mixed layer dynamics. We find that ourDelta d18O estimates are biased by changes in salinity and, thus, do not display a true upper ocean thermal gradient. The Delta T of G. ruber and P. obliquiloculata as well as the alkenone and P. obliquiloculata suggest increased surface water mixing during the late glacial, likely due to enhanced EAWM winds. Surface water mixing was weaker during the late Holocene, indicating a weaker influence of winter monsoon winds. The weakest winter monsoon activity occurred between 6.5 ka and 2.5 ka. Inferred EAWM changes since the Last Glacial Maximum coincide with EAWM changes as recorded in Chinese loess sediments. We find that the intensity of the EAWM and the East Asian summer monsoon show an inverse behavior during the last glacial and deglaciation but covaried during the middle to late Holocene.
Related to:
Steinke, Stephan; Chiu, Han-Yi; Yu, Pai-Sen; Shen, Chuan Chou; Erlenkeuser, Helmut; Löwemark, Ludvig; Chen, Min-Te (2006): On the influence of sea level and monsoon climate on the southern South China Sea freshwater budget over the last 22,000 years. Quaternary Science Reviews, 25(13-14), 1475-1488, https://doi.org/10.1016/j.quascirev.2005.12.008
Steinke, Stephan; Chiu, Han-Yi; Yu, Pai-Sen; Shen, Chuan Chou; Erlenkeuser, Helmut; Löwemark, Ludvig; Chen, Min-Te (2006): Oxygen isotope and Mg/Ca record of planktonic foraminifera of sediment core MD01-2390. PANGAEA, https://doi.org/10.1594/PANGAEA.738282
Further details:
Hughen, Konrad A; Baillie, Mike G L; Bard, Edouard; Beck, J Warren; Bertrand, Chanda J H; Blackwell, Paul G; Buck, Caitlin E; Burr, George S; Cutler, Kirsten B; Damon, Paul E; Edwards, R Lawrence; Fairbanks, Richard G; Friedrich, Michael; Guilderson, Thomas P; Kromer, Bernd; McCormac, F Gerry; Manning, Sturt W; Ramsey, Christopher Bronk; Reimer, Paula J; Reimer, Ron W; Remmele, Sabine; Southon, John R; Stuiver, Minze; Talamo, Sahra; Taylor, Frederick W; van der Plicht, Johannes; Weyhenmeyer, Constanze E (2004): Marine04 marine radiocarbon age calibration, 0-26 cal kyr BP. Radiocarbon, 46(3), 1059-1086, https://doi.org/10.1017/S0033822200033002
Stuiver, Minze; Reimer, Paula J; Bard, Edouard; Beck, J Warren; Burr, George S; Hughen, Konrad A; Kromer, Bernd; McCormac, F Gerry; van der Plicht, Johannes; Spurk, Marco (1998): INTCAL98 radiocarbon age calibration, 24,000-0 cal BP. Radiocarbon, 40(3), 1041-1083, https://doi.org/10.1017/S0033822200019123
Project(s):
Coverage:
Latitude: 6.635300 * Longitude: 113.409000
Date/Time Start: 2001-05-18T06:40:00 * Date/Time End: 2001-05-18T06:40:00
Minimum DEPTH, sediment/rock: 0.125 m * Maximum DEPTH, sediment/rock: 5.575 m
Event(s):
MD01-2390 (MD012390) * Latitude: 6.635300 * Longitude: 113.409000 * Date/Time: 2001-05-18T06:40:00 * Elevation: -1545.0 m * Recovery: 43.72 m * Location: South China Sea * Campaign: MD122 (IMAGES VII - WEPAMA) * Basis: Marion Dufresne (1995) * Method/Device: Giant piston corer (GPC)
Comment:
Samples measured at the Nagoya University Center for Chronological Research, Japan are published previously by Steinke et al. (2006). The 14C ages were calibrated using CALIB 5.0.1 and the marine 04.14c data set (Hughen et al., 2004) without a further adjustment for a regional 14C reservoir age (Delta R = deviation from the average global reservoir age of 400 years).
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Laboratory code/label | Lab label | Steinke, Stephan | |||
| 2 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 3 | Age, dated material | Dated material | Steinke, Stephan | |||
| 4 | Age, dated | Age dated | ka | Steinke, Stephan | Age, 14C AMS | |
| 5 | Age, dated standard deviation | Age dated std dev | ± | Steinke, Stephan | Age, 14C AMS | |
| 6 | Calendar age | Cal age | ka BP | Steinke, Stephan | Age, 14C calibrated | #1 |
| 7 | Calendar age | Cal age | ka BP | Steinke, Stephan | Age, 14C calibrated | #2 |
| 8 | Age, minimum/young | Age min | ka | Steinke, Stephan | Age, 14C calibrated | #1, cal yrs [ka BP], 1 sigma enclosing 68.3 % of probability distribution (Stuiver et al., 1998) |
| 9 | Age, maximum/old | Age max | ka | Steinke, Stephan | Age, 14C calibrated | #1, cal yrs [ka BP], 1 sigma enclosing 68.3 % of probability distribution (Stuiver et al., 1998) |
| 10 | - | - | Steinke, Stephan | #1, relative area under probability distribution | ||
| 11 | Age, minimum/young | Age min | ka | Steinke, Stephan | Age, 14C calibrated | #2, cal yrs [ka BP], 1 sigma enclosing 68.3 % of probability distribution (Stuiver et al., 1998) |
| 12 | Age, maximum/old | Age max | ka | Steinke, Stephan | Age, 14C calibrated | #2, cal yrs [ka BP], 1 sigma enclosing 68.3 % of probability distribution (Stuiver et al., 1998) |
| 13 | - | - | Steinke, Stephan | #2, relative area under probability distribution | ||
| 14 | Laboratory | Lab | Steinke, Stephan |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
75 data points