Citation:

S0277-3791(03)00172-0

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Abstract:

In a deep-sea sediment core recovered from a site lying well above the local lysocline, several organic geochemical proxies, and two different calcite dissolution indicators, are compared in order to evaluate the relationship between calcite dissolution and paleoproductivity over the past three glacial-interglacial cycles. The degree of foraminiferal break-up, and the CaCO3 particle size distribution, both point to significant periods of dissolution every 22 kyr during glacial stages and substages. These dissolution events are concomitant with periods of enhanced primary productivity, as indicated by the abundance of several biomarkers (alkenones, cholesterol, brassicasterol, keto-ol), used here to indicate changes in paleoproductivity. Dissolution fluctuations are highly coherent and in phase with the estimated paleoproductivity variations providing strong evidence that the observed dissolution is due to organic matter remineralization within the sediments rather, than to changes in CO32? concentration in the overlying water column.

Project(s):

South Atlantic in Late Quaternary: Reconstruction of Budget and Currents (SFB261)

Coverage:

Latitude: 5.040000 * Longitude: 73.530000

Date/Time Start: 1990-09-12T00:00:00 * Date/Time End: 1990-09-12T00:00:00

Minimum DEPTH, sediment/rock: 0.080 m * Maximum DEPTH, sediment/rock: 16.910 m

Event(s):

MD90-963 (GS900963) * Latitude: 5.040000 * Longitude: 73.530000 * Date/Time: 1990-09-12T00:00:00 * Elevation: -2446.0 m * Recovery: 53.6 m * Campaign: (SEYMAMA/SHIVA) * Basis: Marion Dufresne (1972) * Method/Device: Piston corer (PC)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m			Geocode
2	Cholesterol per unit sediment mass	Cholesterol/sed	µg/g	Schulte, Sonja	Gas chromatography - Mass spectrometry (GC-MS)
3	Keto-ol, C30 per unit sediment mass	Keto-ol C30/sed	µg/g	Schulte, Sonja	Gas chromatography - Mass spectrometry (GC-MS)

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

244 data points

Data

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

1 Depth sed [m]	2 Cholesterol/sed [µg/g]	3 Keto-ol C30/sed [µg/g]
0.080	0.331	0.039
0.225	0.235	0.586
0.350	0.416	1.060
0.550	1.270	0.754
0.635	1.326	0.456
0.825	2.430	2.168
0.950	0.470	0.422
1.045	1.090	0.712
1.810	0.187	0.049
2.010	0.476	0.217
2.110	0.509	0.026
2.210	1.175	0.465
2.310	1.117	0.102
2.410	0.361	0.265
2.530	0.355	0.108
2.630	0.279	0.192
2.715	0.224	0.069
2.815	0.235	0.055
2.915	0.201	0.061
3.135	0.306	0.151
3.220	0.915	0.391
3.320	0.994	0.322
3.370	0.444	0.530
3.425	0.155	0.076
3.525	0.109
3.640	0.428	0.197
3.715	0.345	0.122
3.825	0.293	0.087
3.925	0.305	0.139
4.025	0.331	0.073
4.120	0.871	0.516
4.220	0.509	0.233
4.320	0.487	0.081
4.430	0.336	0.028
4.515	0.941	0.736
4.600	0.313	0.109
4.700	1.703	0.349
4.800	0.472	0.063
5.005	1.270	0.713
5.105	0.708	0.211
5.205	0.103	0.031
5.305	0.483	0.067
5.400	0.201	0.160
5.605	0.544	0.511
5.720	0.986	0.634
5.820	0.807	0.829
6.000	0.488	0.254
6.120	1.206	0.213
6.400	1.391	0.739
6.605	4.147	2.646
6.705	1.289	0.265
6.805	0.430	0.077
6.900	0.428	0.069
7.005	0.285	0.088
7.105	0.324	0.047
7.230	0.319	0.047
7.300	0.685	0.091
7.400	0.536	0.080
7.695	0.225	0.065
7.970	0.676	0.471
8.050	1.568	2.350
8.150	1.686	1.620
8.250	2.800	0.941
8.350	1.580	1.421
8.450	3.490	3.338
8.650	2.873	1.659
8.805	0.480	0.249
8.895	0.508	0.284
8.995	0.401	0.794
9.210	0.488	0.138
9.310	0.482	0.159
9.410	2.735	1.845
9.510	1.875	0.586
9.610	0.486	0.098
9.710	0.705	0.384
9.810	0.336	0.058
9.910	0.385	0.022
10.000	0.395	0.020
10.085	0.333	0.075
10.185	0.804	0.098
10.290	1.174	0.430
10.370	4.860	0.712
10.470	0.918	0.096
10.575	3.302	3.822
10.665	3.880	5.011
10.865	2.036	0.429
10.965	1.179	0.233
11.065	0.425	0.169
11.165	1.750	0.433
11.265	0.807	0.137
11.365	0.407	0.207
11.470	0.560
11.575	0.724	0.237
11.670	2.459	0.123
12.175	0.746	0.214
12.280	0.244	0.131
12.375	0.288	0.095
12.575	0.974	0.727
12.675	1.270	0.290
12.775	1.113	0.380
13.075	1.250	0.214
13.175	0.511	0.185
13.290	0.567	0.134
13.380	1.692	0.176
13.485	2.035	0.790
13.580	1.480	0.131
14.090	0.381	0.136
14.190	0.571	0.157
14.380	1.615	0.943
14.480	0.391	0.108
14.580	0.572	0.312
14.670	2.216	0.618
14.790	5.326	5.965
14.990	0.960
15.095	0.377	0.041
15.490	0.995	0.111
15.690	1.728
15.910	1.620	0.268
16.010	0.903	0.092
16.110	0.243	0.115
16.310	0.987	0.308
16.410	0.870	0.231
16.710	0.805
16.810	0.582
16.910	0.526	0.125