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Data Publisher for Earth & Environmental Science

Kasper, Sebastian; van der Meer, Marcel T J; Castañeda, Isla S; Tjallingii, Rik; Brummer, Geert-Jan A; Sinninghe Damsté, Jaap S; Schouten, Stefan (2014): delta Deuterium of alkenone and BIT index of sediment core 64PE304-80 samples. PANGAEA, https://doi.org/10.1594/PANGAEA.836271, Supplement to: Kasper, S et al. (2015): Testing alkenone D/H ratio as a paleo indicator of sea surface salinity in a coastal ocean margin (Mozambique Channel). Organic Geochemistry, 78, 62-68, https://doi.org/10.1016/j.orggeochem.2014.10.011

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Abstract:
Reconstructing past ocean salinity is important for assessing paleoceanographic change and therefore past climatic dynamics. Commonly, sea water salinity reconstruction is based on foraminifera oxygen isotope ratio values combined with sea surface temperature reconstruction. However, the approach relies on multiple proxies, resulting in relatively large uncertainty and, consequently, relatively low accuracy of salinity estimates. An alternative tool for past ocean salinity reconstruction is the hydrogen isotope composition of long chain (C37) alkenones (dDalkenone). Here, we applied dDalkenone to a 39 ka long coastal sediment record from the Eastern South African continental shelf in the Mozambique Channel, close to the Zambezi River mouth. Despite changes in global sea water dD related to glacial - interglacial ice volume effects, no clear changes were observed in the dDalkenone record throughout the entire 39 ka. The BIT index record from the same core showed high BIT values during the glacial and low values during the Holocene. This indicates a more pronounced freshwater influence at the core location during the glacial, resulting in alkenones depleted in deuterium during that time and, thereby, explains the lack of a clear glacial-interglacial alkenone dD shift. Correlation between the BIT index and dDalkenone during the glacial period suggests that increased continental runoff potentially changed the growth conditions of the alkenone producing haptophytes, promoting coastal haptophyte species with generally more enriched dDalkenone values. We therefore suggest that the application of dDalkenone for reconstructing past salinity in coastal settings may be complicated by changes in the alkenone producing haptophyte community.
Coverage:
Latitude: -18.240730 * Longitude: 37.869080
Date/Time Start: 2009-03-28T06:56:00 * Date/Time End: 2009-03-28T06:56:00
Minimum DEPTH, sediment/rock: 0.010 m * Maximum DEPTH, sediment/rock: 11.440 m
Event(s):
64PE304-80 * Latitude: -18.240730 * Longitude: 37.869080 * Date/Time: 2009-03-28T06:56:00 * Elevation: -1329.0 m * Location: South-East African margin * Campaign: 64PE304 (INATEX-GEO) * Basis: Pelagia * Method/Device: Gravity corer (GC)
Size:
591 data points

Data

Download dataset as tab-delimited text — use the following character encoding:


Depth sed [m]

Age [ka BP]

δD Alk [‰ SMOW]

δD Alk std dev [±]

BIT

Alk C37/C38
0.0100.4950.0927
0.0600.5980.0880
0.1100.7020.08540.743
0.1600.805-188.9680.5520.09781.134
0.2100.9550.12301.261
0.2601.135-190.06215.0420.0983
0.3101.3150.10201.181
0.3601.496-192.4052.1580.10831.161
0.4101.676-201.3284.0140.10901.204
0.4601.8560.10781.191
0.5102.0370.11651.260
0.5602.2170.12041.255
0.6052.3790.1105
0.6202.4330.1134
0.6702.6140.1045
0.7202.7940.1063
0.7702.9740.1235
0.8203.1550.1280
0.8503.2630.14240.996
0.9003.4430.13781.058
0.9503.6230.12121.126
1.0003.804-193.08811.2130.12401.094
1.0503.9710.12361.172
1.1004.1350.11700.861
1.1504.2990.11960.817
1.2004.463-198.2920.9850.11430.912
1.2504.627-190.3527.7830.10200.920
1.3004.791-194.4220.7210.12411.097
1.3504.9540.12851.275
1.4005.1180.13791.117
1.4505.2820.12611.007
1.5005.446-191.1589.8890.12710.891
1.5505.610-197.2432.5820.10411.061
1.6005.7740.11341.050
1.6505.9380.11670.996
1.7006.102-196.2740.3950.11811.217
1.7506.2450.12961.099
1.8006.374-193.9960.8010.11031.146
1.8506.5030.07081.037
1.9006.6810.07350.514
1.9456.9090.0637
1.9957.162-192.3303.0610.06191.108
2.0457.415-188.7240.3660.05741.155
2.0957.668-191.9001.4760.06841.182
2.1457.920-195.0783.5620.06671.216
2.1958.173-190.9345.2540.06040.762
2.2458.449-186.7281.4790.05830.846
2.2958.768-184.1804.4820.07731.351
2.3459.080-200.1422.1230.07201.168
2.3959.391-182.7043.3640.09731.379
2.4459.702-203.9303.3070.08661.185
2.49510.014-185.3541.4960.07951.241
2.54510.3140.10681.303
2.59510.5900.11491.103
2.64510.8650.09011.070
2.69511.1400.1070
2.74511.4160.1302
2.79511.692-188.4220.1587
2.84511.9620.24571.327
2.89512.2200.2389
2.94512.4780.2751
2.99512.7370.2955
3.04012.9690.2116
3.09013.1760.25431.273
3.14013.349-193.2363.0980.20891.183
3.19013.5220.23301.364
3.24013.6950.24171.274
3.29013.8680.24651.226
3.34014.0410.28661.169
3.39014.2140.27201.218
3.44014.3870.25081.145
3.49014.5600.30251.331
3.54014.7330.36821.267
3.59014.9120.50441.448
3.64015.1140.47731.338
3.69015.3160.52841.252
3.74015.5180.54561.287
3.79015.7200.54571.344
3.84015.922-189.3556.2170.55151.265
3.89016.108-183.9100.59331.259
3.94016.2330.55981.189
3.99016.3580.60071.269
4.04016.4830.58571.088
4.09016.6080.62961.200
4.14016.7320.60611.080
4.19016.8570.56871.277
4.24016.9820.62971.402
4.29017.0610.61331.646
4.34017.1390.59901.238
4.39017.218-181.7110.58721.474
4.44017.2970.62861.560
4.49017.3760.64361.918
4.54017.4540.60221.365
4.59017.5330.56791.652
4.64017.6260.61361.341
4.69017.7420.55741.081
4.74017.858-188.0783.6440.63051.422
4.79017.9920.54201.393
4.84018.126-189.6203.3230.42581.573
4.89018.2650.54571.251
4.94018.418-190.6496.1090.49821.624
4.99018.572-183.6940.50591.403
5.04018.726-197.2405.0980.54911.557
5.09018.8800.50391.046
5.14019.033-196.4142.6740.50991.735
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5.23519.2670.50161.382
5.25019.3080.4867
5.30019.4240.5184
5.35019.5400.49631.491
5.40019.6560.52091.661
5.45019.772-193.4505.4360.42591.365
5.50019.8880.45741.397
5.55020.0050.51021.190
5.60020.1210.53721.549
5.65020.237-193.2255.1180.48261.350
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5.75020.5000.50461.531
5.80020.6370.44881.418
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5.90020.9100.48971.402
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6.00021.184-192.7077.2990.43511.256
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6.10021.5120.48071.605
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6.49522.9840.47741.165
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6.64523.506-188.3373.1270.47191.442
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6.79523.7870.49701.414
6.84523.8770.5308
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6.99524.1440.5462
7.04524.2340.56601.429
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7.14024.4030.45420.885
7.19024.4920.49221.428
7.24024.659-191.0874.3490.67561.248
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7.34025.008-186.5621.5490.47981.309
7.39025.2460.45821.231
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7.49025.776-189.2651.9370.42381.459
7.54026.0410.52381.188
7.59026.3060.50981.180
7.64026.571-188.5460.8080.41651.274
7.69026.836-193.4681.5930.40351.302
7.74027.100-193.7321.7060.39531.357
7.79027.3650.43071.365
7.84027.5800.46541.508
7.89027.782-194.2540.5210.36101.243
7.94028.0600.49551.643
7.99028.339-197.7562.8660.39191.340
8.04028.618-192.1702.9920.46591.476
8.09028.896-195.8521.1870.48101.282
8.14029.1750.47111.527
8.19029.4810.49791.706
8.24029.760-190.4480.5650.4095
8.29030.039-191.7303.1060.31181.507
8.34030.301-191.6902.1380.40731.408
8.39030.497-187.9840.5300.46241.374
8.44030.693-182.6464.6360.44381.274
8.49030.888-186.2300.9930.51921.286
8.54031.084-183.2440.1660.45411.297
8.59031.280-183.0863.1250.50531.291
8.64031.476-181.9592.5340.30391.295
8.69031.672-192.4990.9070.25461.428
8.74031.868-191.8181.5390.33511.326
8.79032.0380.3306
8.84032.208-189.8084.2930.28171.290
8.89032.377-190.5020.5180.34811.332
8.94032.547-198.5200.9230.26271.215
8.99032.717-187.2041.5340.24861.279
9.04032.915-190.0601.7370.39471.291
9.09033.120-193.6481.0100.30971.381
9.14033.326-183.0671.4440.36631.299
9.19033.531-188.6056.0220.32981.317
9.24033.736-197.0282.4860.23591.427
9.29533.962-194.7940.3541
9.34534.1710.33061.418
9.39534.4140.25671.451
9.44534.6560.24601.531
9.49534.8990.27971.472
9.54535.141-197.0881.9540.30371.407
9.59535.384-196.1413.1070.26801.230
9.64535.6260.39681.327
9.69535.869-189.7500.5810.38921.376
9.74536.113-196.0581.1330.31041.341
9.79536.357-202.2443.7940.28981.333
9.84536.601-198.6640.8760.23551.440
9.89536.844-195.6241.7350.25741.394
9.94537.088-199.4820.2890.27611.364
9.99537.332-201.7066.1120.23471.251
10.04537.584-196.1402.5480.29041.249
10.09537.907-199.1620.9340.24211.364
10.14538.230-193.9660.1860.39621.411
10.19538.553-192.9640.6320.43221.307
10.24538.8760.45861.376
10.29539.189-189.6000.7350.60371.169
10.34539.4000.47021.117
10.39039.5910.4543
10.44039.8030.4976
10.49040.0140.5248
10.54040.2260.4934
10.59040.4380.4541
10.64040.6500.4004
10.69040.8610.3548
10.74041.0640.4588
10.79041.2650.4853
10.84041.4660.3834
10.89041.6670.3799
10.94041.8670.3956
10.99042.0680.3211
11.04042.2690.3381
11.09042.4700.3501
11.14042.6710.4890
11.19042.8710.4750
11.24043.0720.5251
11.29043.2730.4295
11.34043.4740.3930
11.39043.6750.4051
11.44043.8750.3931