Citation:

odp.proc.sr.162.014.1999

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Abstract:

Records of bulk carbonate content, ice-rafted detritus (IRD), planktonic foraminifers, and coccolithophores of Ocean Drilling Program Site 982 from the Rockall Plateau and Site 985 from the Norwegian Sea are compared to determine the variability of the south-north gradients in surface water since ~3.1 Ma.

The onset of the major Northern Hemisphere glaciation appears time-transgressively between the sites, as indicated by both a noticeable increase in IRD and marked decrease in carbonate. Thus, each site is recording a somewhat different manifestation of the larger processes that occurred in the interval 2.8 to ~1.1 Ma. Although the interval since ~2.5 Ma was a climatically unstable time interval in the North Atlantic, sedimentation is largely composed of calcareous biogenics at Site 982. Minimum carbonate contents, however, result primarily from dilution by IRD during glacials. In contrast, at Site 985 glacial conditions, probably with discontinuous sea-ice cover, dominated throughout until 1.1 Ma as shown by the nearly carbonate-free sediments. Thus, during most of this time interval the North Atlantic surface water did not enter the Norwegian Sea. Nevertheless, increased carbonate contents and relatively abundant coccoliths indicate increasingly northward penetrations of comparatively warm Atlantic water into the Norwegian Sea during short phases at ~1.9 and 1.4 Ma.

The gradient between the North Atlantic and the Norwegian Sea became less distinct after ~1.1 Ma and even less pronounced after 0.65 Ma. Short but warm interglacials with relatively high biogenic carbonate accumulation occurred in the Norwegian Sea, alternating with longer glacial-dominated intervals with high inputs of IRD. However, glacial-interglacial contrast was subdued in the Norwegian Sea as opposed to the North Atlantic. Thus, a pronounced increase in the meridional circulation of the northern North Atlantic is inferred for the Brunhes Chron.

Project(s):

Ocean Drilling Program (ODP)

Coverage:

Latitude: 57.512667 * Longitude: -15.854183

Date/Time Start: 1995-07-15T00:00:00 * Date/Time End: 1995-07-19T00:00:00

Minimum Elevation: -1134.2 m * Maximum Elevation: -1134.2 m

Event(s):

162-982 * Latitude: 57.512667 * Longitude: -15.854183 * Date/Time Start: 1995-07-15T00:00:00 * Date/Time End: 1995-07-19T00:00:00 * Elevation: -1134.2 m * Penetration: 1143.9 m * Recovery: 1008 m * Location: South Atlantic Ocean * Campaign: * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 120 cores; 1123.9 m cored; 0 m drilled; 89.7% recovery

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Sample code/label	Sample label		Huber, Robert
2	Depth, composite	Depth comp	mcd	Huber, Robert	Intercore correlation
3	AGE	Age	ka BP	Huber, Robert	Counting 125-500 µm fraction	Geocode
4	Foraminifera, planktic	Foram plankt	#/g	Huber, Robert	Counting 125-500 µm fraction
5	Neogloboquadrina pachyderma sinistral	N. pachyderma s	#/g	Huber, Robert	Counting 125-500 µm fraction
6	Foraminifera, planktic, subpolar	Foram plankt subpolar	#/g	Huber, Robert	Counting 125-500 µm fraction
7	Foraminifera, benthic	Foram benth	#/g	Huber, Robert	Counting 125-500 µm fraction
8	Ice rafted debris	IRD	#/g	Huber, Robert	Counting 125-500 µm fraction

License:

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

Size:

1064 data points

Data

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

1 Sample label	2 Depth comp [mcd]	3 Age [ka BP]	4 Foram plankt [#/g]	5 N. pachyderma s [#/g]	6 Foram plankt subpolar [#/g]	7 Foram benth [#/g]	8 IRD [#/g]
162-982A-1H-1,11	0.10	3	15964	222	15742	443	148
162-982A-1H-1,31	0.30	9	24510	957	23553	287	0
162-982A-1H-1,51	0.50	15	10408	1225	9184	153	459
162-982A-1H-1,71	0.70	21	9689	3633	6056	606	3734
162-982A-1H-1,91	0.90	27	17522	14672	2850	211	4011
162-982A-1H-1,111	1.10	33	9757	4879	4879	583	17622
162-982A-1H-1,131	1.30	42	22343	8702	13641	1058	2234
162-982A-1H-2,11	1.60	58	12946	4855	8091	324	2007
162-982A-1H-2,31	1.80	71	20095	9826	10269	443	2069
162-982A-1H-2,51	2.00	84	20159	7237	12923	775	689
162-982A-1H-2,71	2.20	104	44653	17795	26858	989	2472
162-982A-1H-2,91	2.40	116	22717	2631	20086	614	877
162-982A-1H-2,111	2.60	128	6869	302	6567	0	151
162-982A-1H-2,131	2.80	142	16387	709	15678	284	355
162-982A-1H-3,11	3.10	163	13342	6967	6374	371	2298
162-982A-1H-3,31	3.30	177	8190	3528	4662	220	1984
162-982A-1H-3,51	3.50	191	26814	11996	14818	635	1694
162-982A-1H-3,71	3.70	202	25912	14821	11091	393	1865
162-982A-1H-3,91	3.90	210	24694	4994	19700	486	624
162-982A-1H-3,111	4.10	218	36812	17323	19489	677	2842
162-982A-1H-4,11	4.60	244	19433	1629	17804	349	465
162-982A-1H-4,31	4.80	254	19119	8506	10613	234	4292
162-982A-1H-4,51	5.00	264	17680	9120	8560	320	6880
162-982A-1H-4,71	5.20	275	28931	20455	8475	244	11409
162-982A-1H-4,91	5.40	286	21470	5330	16140	525	751
162-982A-1H-4,111	5.60	298	20398	4959	15439	0	1123
162-982A-1H-4,131	5.80	309	21572	2907	18665	382	994
162-982A-1H-5,11	6.10	324	19526	2982	16545	175	585
162-982A-1H-5,31	6.30	334	2425	197	2227	0	99
162-982A-1H-5,51	6.50	341	36914	8179	28735	221	2321
162-982A-1H-5,71	6.70	348	19374	2638	16735	151	3015
162-982A-1H-5,91	6.90	355	6723	4059	2664	299	3411
162-982A-1H-5,111	7.10	362	22710	11721	10989	523	1884
162-982A-1H-5,131	7.30	369	46187	12242	33944	1113	2115
162-982B-2H-1,131	8.12	398	20154	2960	17193	171	740
162-982B-2H-2,21	8.52	404	21605	2018	19587	150	150
162-982B-2H-2,51	8.82	408	14156	1107	13049	0	58
162-982B-2H-2,81	9.12	413	12524	734	11790	49	49
162-982B-2H-2,121	9.52	420	23932	1459	22473	195	97
162-982B-2H-3,11	9.92	427	8288	683	7604	119	59
162-982B-2H-3,41	10.22	432	5551	2580	2970	510	4471
162-982B-2H-3,81	10.62	440	14819	10415	4404	140	4823
162-982B-2H-3,121	11.02	449	35865	26292	9573	539	3371
162-982B-2H-4,11	11.42	458	12876	3367	9509	45	227
162-982B-2H-4,41	11.72	464	7347	2166	5181	88	59
162-982B-2H-4,71	12.02	478	27984	8045	19938	612	175
162-982B-2H-4,111	12.42	498	18713	2766	15946	380	54
162-982B-2H-4,149	12.80	516	19092	4474	14618	1008	441
162-982B-2H-5,35	13.16	529	11697	1462	10235	475	110
162-982B-2H-5,71	13.52	542	15247	1181	14066	770	0
162-982B-2H-5,111	13.92	557	16469	4139	12329	668	312
162-982B-2H-5,149	14.30	571	33207	12095	21112	2089	1869
162-982B-2H-6,41	14.72	585	22606	6344	16262	357	2144
162-982B-2H-6,61	14.92	592	27403	7595	19809	1253	157
162-982B-2H-6,105	15.36	608	35610	3766	31843	0	342
162-982C-3H-2,101	15.78	626	33096	5470	27626	137	684
162-982C-3H-2,141	16.18	641	40631	19266	21364	763	7249
162-982C-3H-3,31	16.56	661	29842	26341	3502	457	2741
162-982C-3H-3,71	16.96	682	18267	7307	10960	426	1461
162-982C-3H-3,111	17.36	693	22072	14028	8044	490	1864
162-982C-3H-3,149	17.74	708	28475	14049	14426	283	754
162-982B-3H-1,141	18.56	724	21349	7348	14001	894	3376
162-982C-3H-4,111	18.86	744	49164	28641	20523	1072	1072
162-982B-3H-2,111	19.76	782	8037	1786	6251	406	365
162-982B-3H-2,149	20.14	794	7091	2295	4796	145	765
162-982B-3H-3,71	20.86	809	18159	9982	8177	159	372
162-982B-3H-3,105	21.20	814	21245	7064	14181	419	262
162-982B-3H-3,141	21.56	820	28080	15440	12640	160	320
162-982B-3H-4,35	22.00	826	15377	6863	8514	87	0
162-982B-3H-4,71	22.36	831	10975	4014	6961	128	854
162-982B-3H-4,111	22.76	837	9118	6254	2864	382	2196
162-982B-3H-4,149	23.14	842	44632	27736	16896	0	1116
162-982B-3H-5,81	23.96	864	49919	22660	27258	164	985
162-982B-3H-5,105	24.20	886	39379	9478	29901	451	339
162-982D-1H-3,51	25.36	946	27123	14191	12932	229	1144
162-982D-1H-3,91	25.76	969	11420	6809	4611	107	1930
162-982D-1H-3,131	26.16	988	30913	17665	13248	1162	2324
162-982D-1H-4,21	26.56	995	38268	24262	14005	197	0
162-982D-1H-4,61	26.96	1002	26139	16195	9944	1515	95
162-982D-1H-4,101	27.36	1009	29508	18814	10694	563	1286
162-982D-1H-4,141	27.76	1032	55402	44903	10499	808	1454
162-982B-4H-1,41	27.98	1043	22924	16102	6821	503	1845
162-982B-4H-1,71	28.28	1064	32259	18775	13485	1037	3008
162-982B-4H-1,105	28.62	1071	64572	33776	30796	662	497
162-982B-4H-1,135	28.92	1082	47542	30591	16951	397	2251
162-982B-4H-2,31	29.40	1108	29390	840	28550	1559	1320
162-982B-4H-2,71	29.80	1130	16545	609	15936	812	711
162-982B-4H-2,111	30.18	1160	22272	1033	21239	689	918
162-982B-4H-2,149	30.56	1176	15785	222	15563	667	1630
162-982B-4H-3,21	30.78	1186	16168	484	15684	775	2711
162-982B-4H-3,55	31.12	1206	29412	2962	26450	952	212
162-982B-4H-3,85	31.42	1223	40834	22946	17888	1357	1110
162-982B-4H-3,121	31.78	1244	38224	5422	32802	949	542
162-982B-4H-4,11	32.18	1270	25636	12469	13167	100	499
162-982B-4H-4,55	32.62	1299	38524	18528	19996	791	1243
162-982B-4H-4,91	32.98	1324	30497	14263	16234	1595	0
162-982B-4H-4,115	33.22	1340	31310	12203	19107	1686	0
162-982B-4H-4,149	33.56	1362	38595	15464	23130	793	132
162-982B-4H-5,41	33.98	1375	21127	10240	10887	824	2413
162-982B-4H-5,85	34.42	1397	37657	22475	15181	254	339
162-982B-4H-5,121	34.78	1434	17093	10098	6994	41	621
162-982B-4H-6,11	35.18	1458	40294	18879	21415	564	282
162-982B-4H-6,55	35.62	1489	42610	15530	27080	1262	582
162-982C-5H-1,41	35.96	1514	22921	9907	13014	777	874
162-982C-5H-1,81	36.36	1542	24176	13100	11076	746	1065
162-982C-5H-1,121	36.76	1567	25013	13940	11073	692	2175
162-982C-5H-2,11	37.16	1592	34100	16080	18019	456	1026
162-982C-5H-2,51	37.56	1616	50771	30197	20574	1161	332
162-982C-5H-2,149	38.54	1658	5703	3530	2172	91	9716
162-982B-5H-1,91	38.98	1683	46717	18731	27986	220	4297
162-982B-5H-1,131	39.40	1710	38548	23047	15502	1235	1235
162-982B-5H-2,3	39.70	1734	32683	16507	16177	330	578
162-982B-5H-2,41	40.08	1764	48267	20141	28125	181	544
162-982B-5H-2,71	40.28	1772	10004	4671	5332	617	529
162-982B-5H-2,91	40.50	1780	27481	3637	23844	808	4984
162-982B-5H-2,121	40.78	1788	44886	570	44316	427	142
162-982B-5H-3,11	41.18	1812	37196	939	36257	564	0
162-982B-5H-3,55	41.62	1844	36578	766	35812	192	0
162-982B-5H-3,91	41.98	1861	49788	161	49627	1450	322
162-982B-5H-3,121	42.28	1868	41057	784	40273	784	1880
162-982B-5H-4,11	42.70	1904	54572	315	54257	315	315
162-982B-5H-4,51	43.08	1934	36994	848	36146	318	106
162-982B-5H-4,91	43.48	1966	12924	327	12597	368	1718
162-982B-5H-4,135	43.92	1994	31986	620	31366	620	1116
162-982B-5H-5,21	44.28	2023	47510	1250	46260	500	500
162-982B-5H-5,61	44.68	2042	30850	812	30038	677	677
162-982B-5H-5,101	45.10	2060	26530	194	26335	777	389
162-982B-5H-5,141	45.48	2076	18436	365	18071	669	487
162-982B-5H-6,31	45.90	2101	10875	1269	9607	145	2973
162-982B-5H-6,71	46.28	2117	16406	4182	12224	483	1019
162-982B-5H-6,101	46.58	2132	23209	225	22984	789	1014
162-982C-6H-1,71	47.08	2159	14593	231	14362	634	346
162-982C-6H-1,111	47.48	2181	24588	369	24219	246	492
162-982C-6H-1,149	47.90	2204	3350	41	3309	103	4829
162-982C-6H-2,81	48.70	2238	23990	631	23359	1010	631
162-982B-6H-2,121	49.08	2256	32312	152	32159	381	914
162-982C-6H-3,11	49.48	2274	7444	150	7293	150	414
162-982B-6H-2,11	50.61	2315	25754	85	25669	169	0
162-982B-6H-2,35	50.85	2323	17162	53	17108	478	1381
162-982B-6H-2,91	51.41	2343	18295	216	18079	54	108
162-982B-6H-3,11	52.11	2364	36633	224	36409	672	896
162-982B-6H-3,111	53.11	2404	13778	129	13649	386	644
162-982B-6H-4,41	53.91	2438	10253	343	9910	572	152
162-982C-6H-4,121	54.71	2488	13273	785	12489	785	5165
162-982B-6H-5,71	55.71	2513	11363	247	11116	412	0
162-982B-6H-5,149	56.49	2536	12038	785	11253	916	0
162-982B-6H-6,91	57.41	2582	4305	80	4226	319	1515
162-982A-6H-4,71	57.93	2641	8757	154	8603	845	154
162-982A-6H-4,141	58.63	2676	5944	54	5891	696	0
162-982A-6H-5,81	59.53	2709	2235	99	2136	695	3378
162-982B-7H-2,71	60.97	2762	4177	33	4144	214	0
162-982B-7H-2,149	61.75	2791	3450	0	3450	308	62