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Stein, Ruediger; Fahl, Kirsten (2012): Biomarker distributions in sediment core PS2767-4. PANGAEA, https://doi.org/10.1594/PANGAEA.803235, Supplement to: Stein, R; Fahl, K (2012): A first southern Lomonosov Ridge (Arctic Ocean) 60 ka IP25 sea-ice record. Polarforschung, 82(1), 83-86, hdl:10013/epic.40434.d001

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Abstract:
Here, we present a first (low-resolution) biomarker sea-ice proxy record from the High Arctic (southern Lomonosov Ridge), going back in time to about 60 ka (MIS 3 to MIS 1). Variable concentrations of the sea-ice diatom specific highly branched isoprenoid (HBI) with 25 carbon atoms ("IP25"), in combination with the phytoplankton biomarker brassicasterol, suggest variable seasonal sea-ice coverage and open-water productivity during MIS 3. During most of MIS 2, the spring to summer sea-ice margin significantly extended towards the south, resulting in a drastic decrease in phytoplankton productivity. During the Early Holocene Climate Optimum, brassicasterol reached its maximum, interpreted as signal for elevated phytoplankton productivity due to a significantly reduced sea-ice cover. During the mid-late Holocene, IP25 increased and brassicasterol decreased, indicating extended sea-ice cover and reduced phytoplankton productivity, respectively. The HBI diene/IP25 ratios probably reached maximum values during the Bølling-Allerød warm period and decreased during the Holocene, suggesting a correlation with sea-surface temperature.
Coverage:
Latitude: 79.743100 * Longitude: 144.006100
Date/Time Start: 1995-08-31T00:00:00 * Date/Time End: 1995-08-31T00:00:00
Minimum DEPTH, sediment/rock: 0.300 m * Maximum DEPTH, sediment/rock: 8.220 m
Event(s):
PS2767-4 (PS36/066) * Latitude: 79.743100 * Longitude: 144.006100 * Date/Time: 1995-08-31T00:00:00 * Elevation: -572.0 m * Recovery: 8.25 m * Location: Arctic Ocean * Campaign: ARK-XI/1 (PS36) * Basis: Polarstern * Method/Device: Kasten corer (KAL) * Comment: 9 core sections: 0.22-1.22, 1.22-2.22, 2.22-3.22, 3.22-4.22, 4.22-5.22, 5.22-6.22, 6.22-7.22, 7.22-8, 8-8.2 m
Size:
428 data points

Data

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


Depth sed [m]

Age [ka BP]

TOC [%]

IP25/TOC [µg/g]

C25 HBI diene/TOC [µg/g]

C25 HBI diene/IP25

PBIP25

Brassicasterol/TOC [µg/g]

Campesterol/TOC [µg/g]
10 
b-Sitosterol/TOC [µg/g]
0.3001.8200.600.6560.3750.5720.9311.8965.0747.995
0.4002.4300.500.0000.0000.0000.0001.7772.2277.779
0.5003.0400.620.4680.5261.1260.7077.6157.44116.425
0.6003.6400.640.3940.5661.4340.6667.7677.36624.874
0.7004.2500.610.7311.1251.5390.69412.6337.25721.533
0.8004.8600.640.1710.2951.7190.6303.9404.35022.374
0.9005.4700.640.4300.5591.2990.6817.8928.69619.042
1.0006.0700.670.2610.5742.2010.46211.89118.29453.651
1.1006.6800.680.6671.5722.3580.62715.53418.43945.052
1.2007.2900.820.2600.6392.4550.38816.09915.74756.919
1.3007.9000.770.3340.7172.1450.28432.99625.66352.414
1.4008.5000.800.2100.6813.2370.28720.55632.71685.131
1.5009.1100.780.2940.9523.2410.36320.18919.91556.598
1.6009.7200.740.1570.3852.4550.32013.07516.54650.225
1.7009.9900.700.3200.7682.4020.39719.02218.35453.033
1.80010.1200.820.1530.3262.1290.34211.52717.96852.417
1.90010.2600.760.2910.8682.9780.39617.40718.93052.066
2.00010.3900.590.0850.3464.0850.2848.38813.98143.229
2.10010.7500.430.0000.0000.0000.0000.00065.2979.887
2.20011.1500.390.0230.0331.4590.1823.98414.5339.809
2.35011.7300.430.5342.9825.5800.7168.3329.26925.030
2.45012.1300.280.0000.2440.0002.8201.8717.525
2.65012.9100.280.1501.0977.2881.0000.0003.3453.858
2.85014.0300.270.2770.0000.0001.0000.0005.54512.809
3.05016.1300.340.0000.0000.0000.0000.0004.3757.643
3.24018.1200.400.0000.0000.0000.0000.00028.32512.064
3.34019.1700.390.1080.0000.0000.5823.0313.12511.497
3.54021.2700.320.0000.0000.0000.0004.2275.57613.423
3.74023.3700.290.0000.0000.0000.0000.0008.3506.532
3.84024.4200.270.0000.0000.0000.0000.00013.45142.345
4.04026.5200.320.0420.0000.0001.0000.0004.82610.158
4.21028.2800.370.0000.0000.0000.0000.0003.77315.620
4.34029.3300.470.0580.0370.6401.0000.0004.6088.471
4.44030.1500.360.0000.0000.0000.0004.99915.00979.981
4.64031.7700.390.1010.0370.3640.4714.4352.90210.684
4.74032.5800.440.0000.0000.0000.00012.2897.26915.926
4.90033.8700.440.1710.2131.2430.6903.0078.90725.749
5.08035.3300.370.0000.2130.0000.00023.52127.868
5.23036.5500.420.0000.2870.0008.36515.07818.233
5.43038.1700.340.0000.1270.00010.3316.20427.529
5.63039.7900.380.0000.0620.0000.0000.0003.77511.766
5.82041.3300.390.0960.4414.5840.4424.7666.94326.431
5.90041.9800.310.2501.0074.0280.6196.0354.09914.916
6.12043.7600.290.0000.0000.0000.0000.0000.00063.955
6.23044.6500.310.1160.0000.0000.6262.71910.7465.855
6.43046.2700.440.0000.0000.0000.0000.0000.00014.101
6.63047.9000.440.2360.1040.4381.0000.0003.14010.325
6.72048.6300.290.0000.0000.0000.0000.0004.34013.108
7.02051.0600.290.0000.0000.0000.0008.01015.2774.608
7.21052.6000.310.6441.5132.3501.0000.0000.0008.724
7.30053.3300.260.0000.0000.0000.0000.0000.0008.987
7.54055.2700.370.0630.0000.0001.0000.0005.0602.596
7.74056.8900.580.3270.5721.7471.0000.0000.00039.243
8.22060.6200.740.2430.5042.0720.37016.25115.84539.578