Jonkers, Lukas; Jimenez-Amat, Patricia; Mortyn, P Graham; Brummer, Geert-Jan A (2013): Mg/Ca ratios of Neogloboquadrina pachyderma (s) and Globigerina bulloides in Irminger Sea sediment trap time series [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.816232, Supplement to: Jonkers, L et al. (2013): Seasonal Mg/Ca variability of N. pachyderma (s) and G. bulloides: Implications for seawater temperature reconstruction. Earth and Planetary Science Letters, 376, 137-144, https://doi.org/10.1016/j.epsl.2013.06.019
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Abstract:
iven the importance of high-latitude areas in the ocean-climate system, there is need for a paleothermometer that is reliable at low temperatures. Here we assess the applicability of the Mg/Ca-temperature proxy in colder waters (5-10 °C) by comparing for the first time the seasonal Mg/Ca and d18O cycles of N. pachyderma (s) and G. bulloides using a sediment trap time-series from the northern North Atlantic. While both species show indistinguishable seasonal d18O patterns that clearly track the near surface temperature cycle, their Mg/Ca are very different. G. bulloides Mg/Ca is high (2.0-3.1 mmol/mol), but varies in concert with the seasonal temperature cycle. The Mg/Ca of N. pachyderma (s), on the other hand, is low (1.1-1.5 mmol/mol) and shows only a very weak seasonal cycle. The d18O patterns indicate that both species calcify in the same depth zone. Consequently, depth habitat differences cannot explain the contrasting Mg/Ca patterns. The elevated Mg/Ca in pristine G. bulloides might be due to the presence of high Mg phases that are not preserved in fossil shells. The contrasting absence of a seasonal trend in the Mg/Ca of N. pachyderma (s) confirms other studies where calcification temperatures were less well constrained. The reason for this absence is not fully known, but may include species-specific vital effects. The very different seasonal patterns of both species' Mg/Ca underscore the importance of parameters other than temperature in controlling planktonic foraminiferal Mg/Ca. Our results therefore lend further caution in the interpretation of Mg/Ca-temperature reconstructions from high northern latitudes.
Related to:
Jonkers, Lukas; Brummer, Geert-Jan A; Peeters, Frank J C; van Aken, Hendrik M; de Jong, M Femke (2010): Seasonal stratification, shell flux, and oxygen isotope dynamics of left-coiling N. pachyderma and T. quinqueloba in the western subpolar North Atlantic. Paleoceanography, 25, PA2204, https://doi.org/10.1029/2009PA001849
Jonkers, Lukas; van Heuven, Steven; Zahn, Rainer; Peeters, Frank J C (2013): Planktonic foraminifera fluxes and stable isotope ratios in the Irminger Sea. PANGAEA, https://doi.org/10.1594/PANGAEA.807458 (Stable oxygen isotope data of N. pachyderma (s) and G. bulloides)
Jonkers, Lukas; van Heuven, Steven; Zahn, Rainer; Peeters, Frank J C (2013): Seasonal patterns of shell flux, d18O and d13C of small and large N. pachyderma (s) and G. bulloides in the subpolar North Atlantic. Paleoceanography, 28(1), 164-174, https://doi.org/10.1002/palo.20018
Coverage:
Median Latitude: 59.280300 * Median Longitude: -39.393100 * South-bound Latitude: 59.247500 * West-bound Longitude: -39.657800 * North-bound Latitude: 59.345700 * East-bound Longitude: -38.863700
Date/Time Start: 2003-08-31T00:00:00 * Date/Time End: 2007-05-19T00:00:00
Minimum DEPTH, water: 2750 m * Maximum DEPTH, water: 2750 m
Event(s):
IRM_1 * Latitude: 59.345700 * Longitude: -38.863700 * Date/Time: 2003-08-31T00:00:00 * Elevation: -3000.0 m * Location: North Atlantic * Method/Device: Trap, sediment (TRAPS)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Sample code/label | Sample label | Jonkers, Lukas | |||
| 3 | DATE/TIME | Date/Time | Geocode | |||
| 4 | Date/time end | Date/time end | Jonkers, Lukas | |||
| 5 | DEPTH, water | Depth water | m | Geocode | ||
| 6 | Neogloboquadrina pachyderma, Magnesium/Calcium ratio | N. pachyderma Mg/Ca | mmol/mol | Jonkers, Lukas | Inductively coupled plasma - mass spectrometry (ICP-MS) | size fraction: 150-250 µm, sinistral |
| 7 | Globigerina bulloides, Magnesium/Calcium ratio | G. bulloides Mg/Ca | mmol/mol | Jonkers, Lukas | Inductively coupled plasma - mass spectrometry (ICP-MS) | 250-315 µm |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
96 data points
Data
| 1 Event | 2 Sample label | 3 Date/Time | 4 Date/time end | 5 Depth water [m] | 6 N. pachyderma Mg/Ca [mmol/mol] | 7 G. bulloides Mg/Ca [mmol/mol] |
|---|---|---|---|---|---|---|
| IRM_1 | IRM-1 A-01 | 2003-08-31 | 2003-09-19 | 2750 | 1.32 | 2.42 |
| IRM_1 | IRM-1 A-02 | 2003-09-19 | 2003-10-08 | 2750 | 1.42 | 2.37 |
| IRM_1 | IRM-1 A-03 | 2003-10-08 | 2003-10-27 | 2750 | 2.64 | |
| IRM_1 | IRM-1 A-15 | 2004-05-23 | 2004-06-11 | 2750 | 1.20 | |
| IRM_1 | IRM-1 A-16 | 2004-06-11 | 2004-06-30 | 2750 | 1.26 | 2.23 |
| IRM_1 | IRM-1 A-17 | 2004-06-30 | 2004-07-19 | 2750 | 1.21 | 2.21 |
| IRM_1 | IRM-1 A-18 | 2004-07-19 | 2004-08-07 | 2750 | 2.80 | |
| IRM_1 | IRM-1 A-19 | 2004-08-07 | 2004-08-26 | 2750 | 1.23 | 2.71 |
| IRM_1 | IRM-1 A-20 | 2004-08-26 | 2004-09-14 | 2750 | 1.36 | 3.08 |
| IRM_3 | IRM-3 A-01 | 2005-09-21 | 2005-10-07 | 2750 | 3.03 | |
| IRM_3 | IRM-3 A-02 | 2005-10-07 | 2005-10-23 | 2750 | 2.85 | |
| IRM_3 | IRM-3 A-03 | 2005-10-23 | 2005-11-08 | 2750 | 2.86 | |
| IRM_3 | IRM-3 A-14 | 2006-04-17 | 2006-05-03 | 2750 | 1.18 | |
| IRM_3 | IRM-3 A-15 | 2006-05-03 | 2006-05-19 | 2750 | 1.32 | |
| IRM_3 | IRM-3 A-16 | 2006-05-19 | 2006-06-04 | 2750 | 1.31 | |
| IRM_3 | IRM-3 A-17 | 2006-06-04 | 2006-06-20 | 2750 | 1.21 | 2.10 |
| IRM_3 | IRM-3 A-18 | 2006-06-20 | 2006-07-06 | 2750 | 1.25 | 1.99 |
| IRM_3 | IRM-3 A-19 | 2006-07-06 | 2006-07-22 | 2750 | 1.07 | 1.98 |
| IRM_3 | IRM-3 A-20 | 2006-07-22 | 2006-08-07 | 2750 | 1.20 | 2.38 |
| IRM_3 | IRM-3 A-21 | 2006-08-07 | 2006-08-23 | 2750 | 1.28 | 2.09 |
| IRM_4 | IRM-4 A-01 | 2006-09-05 | 2006-09-21 | 2750 | 1.35 | 2.45 |
| IRM_4 | IRM-4 A-02 | 2006-09-21 | 2006-10-07 | 2750 | 1.46 | 2.43 |
| IRM_4 | IRM-4 A-03 | 2006-10-07 | 2006-10-23 | 2750 | 1.36 | 2.38 |
| IRM_4 | IRM-4 A-04 | 2006-10-23 | 2006-11-08 | 2750 | 2.47 | |
| IRM_4 | IRM-4 A-15 | 2007-04-17 | 2007-05-03 | 2750 | 1.21 | |
| IRM_4 | IRM-4 A-16 | 2007-05-03 | 2007-05-19 | 2750 | 1.19 | |
| IRM_4 | IRM-4 A-17 | 2007-05-19 | 2007-06-04 | 2750 | 1.20 | 1.97 |