Citation:

j.quascirev.2010.08.007

Name: Ratio of Diene/Triene of sediment core MD03-2601
Published: 2010
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Micropaleontological and biomarker data from two high-accumulation marine sites from the Coastal and Continental Shelf Zone (CCSZ) off East Antarctica (Adélie Land at w140°E and eastern Prydz Bay at w77°E) are used to reconstruct Holocene changes in sea ice and wind stress at the basin-wide scale. These data demonstrate congruent increase in sea-ice concentration/persistence and wind stress-related sea-surface turbulence in the two regions since 7 cal ka BP, with a particularly strong signal since 4.5 - 3.5 cal ka BP. Comparison of these high latitude records with sea ice and turbulence records from the southern mid-latitudes highlights distinctive climatic evolutions according to the different latitudinal bands. Sea-ice persistence and turbulence increase in East Antarctica CCSZ are opposite to sea-surface warming and sea-ice retreat recorded after 4.5 - 3.5 cal ka BP in the East Atlantic and Indian sector between 55 and 45°S. At the same period, paleodata suggest SST cooling in all major coastal upwelling systems of the southern hemisphere, caused by the northward transport of subpolar surface waters as a response to southern Westerlies reinforcement. We therefore propose, as suggested for the northern hemisphere, that Holocene changes in the latitudinal insolation gradient, primarily forced by obliquity and precession and amplified by sea-ice and glacial-ice expansions in the Antarctic realm, are responsible for the observed contrasted latitudinal patterns of southern latitudes.

Coverage:

Latitude: -66.051200 * Longitude: 138.557200

Date/Time Start: 2003-02-08T08:51:00 * Date/Time End: 2003-02-08T08:51:00

Minimum DEPTH, sediment/rock: 0.03 m * Maximum DEPTH, sediment/rock: 39.92 m

Event(s):

MD03-2601 (MD032601) * Latitude: -66.051200 * Longitude: 138.557200 * Date/Time: 2003-02-08T08:51:00 * Elevation: -746.0 m * Recovery: 40.3 m * Location: Southern Ocean * Campaign: (IMAGES X - CADO) * Basis: * Method/Device: Calypso Corer (CALYPSO)

Comment:

Age is given in calendar years BP.

Data were obtained within the framework of the ERC StG ICEPROXY project (Grant number: 203441) and ANR CLIMICE (ANR-08-CEXC-012-01), provided for the data compilation of the Past4Future Project. Core MD03-2601 was retrieved during Images X cruise with the logistic support of IPEV-TAAF.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	DEPTH, sediment/rock	Depth sed	m		Geocode
2	AGE	Age	ka BP		Geocode
3	Diene/Triene highly branched isoprenois, ratio	HBI-diene/triene		Massé, Guillaume

License:

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

Size:

135 data points

Data

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

1 Depth sed [m]	2 Age [ka BP]	3 HBI-diene/triene
0.03	1.004	0.357
0.32	1.059	0.653
0.64	1.121	0.376
0.96	1.182	0.367
1.28	1.243	0.313
1.60	1.304	0.308
1.92	1.366	0.358
2.24	1.427	0.197
2.56	1.488	0.135
2.88	1.549	0.087
3.12	1.595	0.060
3.20	1.610	0.132
3.52	1.672	0.093
3.84	1.733	0.109
4.16	1.794	0.128
4.48	1.855	0.229
4.60	1.878	0.147
4.80	1.917	0.106
5.12	1.987	0.043
5.44	2.068	0.102
5.76	2.150	0.100
6.00	2.212	0.059
6.08	2.232	0.100
6.40	2.314	0.110
6.72	2.395	0.127
7.04	2.477	0.102
7.36	2.559	0.119
7.60	2.620	0.160
7.68	2.641	0.136
8.00	2.722	0.090
8.32	2.804	0.228
8.64	2.886	0.259
8.96	2.967	0.110
9.04	2.988	0.138
9.28	3.049	0.112
9.60	3.131	0.203
9.92	3.213	0.213
10.24	3.294	0.263
10.56	3.376	0.229
10.88	3.458	0.080
11.20	3.540	0.053
11.52	3.621	0.069
11.84	3.703	0.121
12.16	3.785	0.021
12.48	3.867	0.038
12.80	3.948	0.110
13.12	4.030	0.166
13.44	4.112	0.093
13.54	4.137	0.030
13.76	4.193	0.116
14.08	4.275	0.102
14.40	4.357	0.066
14.72	4.439	0.139
15.04	4.520	0.188
15.36	4.602	0.072
15.68	4.684	0.117
16.00	4.766	0.085
16.32	4.847	0.058
16.40	4.868	0.035
16.64	4.929	0.045
16.96	5.011	0.074
17.28	5.092	0.128
17.60	5.174	0.100
17.84	5.235	0.052
17.92	5.256	0.037
18.24	5.338	0.064
18.56	5.419	0.053
18.88	5.501	0.047
19.20	5.583	0.052
19.40	5.634	0.054
19.52	5.665	0.091
19.84	5.746	0.074
20.16	5.828	0.063
20.48	5.911	0.035
20.80	5.993	0.041
20.90	6.019	0.036
21.12	6.075	0.040
21.65	6.212	0.032
21.76	6.240	0.048
22.08	6.323	0.166
22.40	6.405	0.018
22.72	6.487	0.029
23.06	6.575	0.023
23.36	6.652	0.054
23.68	6.734	0.057
24.00	6.817	0.054
24.32	6.899	0.043
24.64	6.981	0.076
24.96	7.064	0.099
25.28	7.145	0.095
25.60	7.227	0.105
25.92	7.309	0.063
26.24	7.390	0.084
26.56	7.472	0.119
26.88	7.553	0.058
27.20	7.635	0.041
27.32	7.666	0.070
27.84	7.798	0.128
28.16	7.880	0.120
28.48	7.962	0.028
28.78	8.038	0.107
29.10	8.120	0.063
29.38	8.191	0.039
29.70	8.273	0.068
30.02	8.352	0.043
30.34	8.416	0.085
30.66	8.481	0.074
30.98	8.545	0.108
31.30	8.609	0.039
31.62	8.673	0.022
31.94	8.738	0.011
32.26	8.802	0.029
32.40	8.830	0.028
32.58	8.866	0.056
33.22	8.995	0.031
33.54	9.059	0.026
33.86	9.123	0.047
34.18	9.187	0.037
34.50	9.252	0.094
34.82	9.316	0.042
35.14	9.398	0.058
35.46	9.499	0.099
35.78	9.600	0.041
36.10	9.701	0.029
36.42	9.802	0.063
36.74	9.902	0.116
37.06	10.003	0.320
37.38	10.104	0.036
38.02	10.306	0.048
38.34	10.406	0.055
38.66	10.507	0.165
38.98	10.608	0.151
39.28	10.702	0.155
39.60	10.803	0.088
39.92	10.904	0.066