Citation:

PANGAEA.919846

Name: Alkenone sea surface temperatures Uk'37-SST from sediment core MD01-2444 on the Portuguese Margin, Marine Isotope Stage 3
Published: 2020-07-03
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Heinrich Stadials; Interstadials; MIS 3; Portuguese Margin

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Abstract:

Alkenone SST: Sediment samples (2.5 to 2.57 g) were freeze-dried and extracted by sonication using dichloromethane. The extracts were dried under nitrogen and hydrolysed with 7% potassium hydroxide in methanol. Extraction with hexane yielded a fraction enriched in neutral compounds, which was cleaned with ultra-pure water. The purified extracts were derivatised with BSTFA. Samples were injected diluted in toluene. They were then analysed with a Varian gas chromatograph Model 3400 equipped with a septum programmable injector and a flame ionisation detector. Absolute concentration errors were below 10%. Reproducibility tests showed that the uncertainty in the Uk'37 determinations was lower than 0.015 (ca. ±0.5ºC). The SST reconstruction (Uk'37-SST) was obtained from the relative composition of C37 unsaturated alkenones [Uk'37 = C37:2/(C37:2+C37:3)], using the calibration equation Uk'37 = 0.033*SST+0.044. The record was generated by B. Martart and J.O. Grimalt.

Age model: The age model was developed by aligning the abrupt transitions of d18O record of G. bulloides in core MD01-2444 to warming and cooling events in the NGRIP d18Oice record, presented on: (i) the GICC05 timescale [Svensson, A. et al. A 60,000 year Greenland stratigraphic ice core chronology. Clim. Past 4, 47–57 (2008)]; and (ii) the WD2014: modified timescale, whereby NGRIP GICC05 ice ages 31.2–67.2 ka are multiplied by 1.0063. [Buizert, C. et al. The WAIS Divide deep ice core WD2014 chronology – Part 1: Methane synchronization (68–31 ka BP) and the gas age–ice age difference. Clim. Past 11, 153-173 (2015)].

Keyword(s):

Heinrich Stadials; Interstadials; MIS 3; Portuguese Margin

Supplement to:

Margari, Vasiliki; Skinner, Luke C; Menviel, Laurie; Capron, Emilie; Rhodes, Rachael H; Mleneck-Vautravers, Maryline J; Ezat, Mohamed M; Martrat, Belén; Grimalt, Joan O; Hodell, David A; Tzedakis, Polychronis C (2020): Fast and slow components of interstadial warming in the North Atlantic during the last glacial. Communications Earth & Environment, 1(1), https://doi.org/10.1038/s43247-020-0006-x

Further details:

Buizert, Christo; Cuffey, Kurt M; Severinghaus, Jeffrey P; Baggenstos, Daniel; Fudge, Tyler J; Steig, Eric J; Markle, Bradley R; Winstrup, Mai; Rhodes, Rachael H; Brook, Edward J; Sowers, Todd A; Clow, Gary D; Cheng, Hai; Edwards, Ross L; Sigl, Michael; McConnell, Joseph R; Taylor, Kendrick C (2015): The WAIS Divide deep ice core WD2014 chronology - Part 1: Methane synchronization (68–31 ka BP) and the gas age–ice age difference. Climate of the Past, 11(2), 153-173, https://doi.org/10.5194/cp-11-153-2015

Svensson, Anders M; Andersen, Katrine K; Bigler, Matthias; Clausen, Henrik Brink; Dahl-Jensen, Dorthe; Davies, Siwan M; Johnsen, Sigfús Jóhann; Muscheler, Raimund; Parrenin, Frédéric; Rasmussen, Sune Olander; Röthlisberger, Regine; Seierstad, Inger K; Steffensen, Jørgen Peder; Vinther, Bo Møllesøe (2008): A 60 000 year Greenland stratigraphic ice core chronology. Climate of the Past, 4(1), 47-57, https://doi.org/10.5194/cp-4-47-2008

Coverage:

Latitude: 37.565000 * Longitude: -10.134000

Minimum DEPTH, sediment/rock: 9.00 m * Maximum DEPTH, sediment/rock: 13.66 m

Event(s):

MD01-2444 * Latitude: 37.565000 * Longitude: -10.134000 * Elevation: -2656.0 m * Campaign: (GEOSCIENCES, MARMARCORE) * Basis: * Method/Device: Calypso Corer (CALYPSO)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m	Tzedakis, Polychronis C		Geocode
2	Age model	Age model	ka	Tzedakis, Polychronis C	Age model, GICC05
3	Age model	Age model	ka	Tzedakis, Polychronis C	Age model, WD2014
4	Sea surface temperature	SST	°C	Tzedakis, Polychronis C	Calculated from UK'37

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Size:

462 data points

Data

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

1 Depth sed [m]	2 Age model [ka] (Age model, GICC05)	3 Age model [ka] (Age model, WD2014)	4 SST [°C] (Calculated from UK'37)
9.00	35.051	35.272	14.93
9.06	35.242	35.464	14.48
9.09	35.337	35.560	14.24
9.12	35.432	35.655	14.75
9.15	35.533	35.757	12.51
9.21	35.747	35.972	12.70
9.24	35.853	36.079	12.01
9.27	35.960	36.187	12.02
9.33	36.173	36.401	13.32
9.36	36.280	36.509	13.62
9.39	36.387	36.616	13.46
9.42	36.493	36.723	13.94
9.45	36.600	36.831	13.52
9.48	36.716	36.947	13.93
9.51	36.831	37.063	14.18
9.54	36.947	37.180	14.21
9.57	37.063	37.296	14.67
9.60	37.179	37.413	14.72
9.63	37.294	37.529	14.52
9.66	37.410	37.646	14.36
9.69	37.526	37.762	14.79
9.72	37.641	37.878	14.52
9.75	37.757	37.995	14.68
9.78	37.873	38.112	14.73
9.81	37.989	38.228	14.79
9.84	38.104	38.344	14.26
9.87	38.220	38.461	14.19
9.90	38.373	38.615	13.07
9.93	38.527	38.770	13.83
9.96	38.680	38.924	12.27
9.99	38.833	39.078	11.19
10.02	38.987	39.233	10.78
10.05	39.140	39.387	10.83
10.08	39.293	39.541	10.95
10.11	39.447	39.696	10.26
10.14	39.600	39.849	11.25
10.17	39.686	39.936	12.33
10.20	39.772	40.023	13.64
10.23	39.858	40.109	13.60
10.26	39.945	40.197	13.74
10.29	40.031	40.283	14.12
10.32	40.117	40.370	14.14
10.35	40.232	40.485	13.79
10.38	40.377	40.631	14.21
10.41	40.521	40.776	13.87
10.44	40.666	40.922	13.94
10.47	40.810	41.067	14.21
10.50	40.954	41.212	14.28
10.53	41.099	41.358	14.29
10.56	41.243	41.503	14.77
10.59	41.388	41.649	14.66
10.62	41.519	41.781	14.04
10.65	41.636	41.898	14.33
10.68	41.754	42.017	12.52
10.71	41.871	42.135	12.70
10.74	41.989	42.254	13.48
10.77	42.106	42.371	13.69
10.80	42.224	42.490	14.32
10.83	42.341	42.608	14.31
10.86	42.459	42.726	14.48
10.89	42.576	42.844	14.73
10.92	42.694	42.963	14.70
10.95	42.811	43.081	14.79
10.98	42.929	43.199	15.03
11.01	43.046	43.317	14.53
11.04	43.164	43.436	14.26
11.07	43.281	43.554	14.73
11.10	43.412	43.685	13.93
11.13	43.557	43.831	13.72
11.16	43.702	43.977	13.18
11.19	43.846	44.122	13.47
11.22	43.991	44.268	14.13
11.25	44.136	44.414	13.97
11.28	44.280	44.559	14.78
11.31	44.425	44.705	15.05
11.34	44.570	44.851	15.15
11.37	44.714	44.996	15.20
11.40	44.859	45.142	14.82
11.43	45.004	45.288	15.42
11.46	45.148	45.432	15.43
11.49	45.293	45.578	15.28
11.50	45.341	45.627	15.39
11.53	45.486	45.773	15.19
11.56	45.630	45.917	15.24
11.59	45.775	46.063	15.68
11.62	45.920	46.209	15.47
11.65	46.064	46.354	15.26
11.68	46.209	46.500	15.94
11.71	46.354	46.646	15.71
11.74	46.498	46.791	15.35
11.77	46.643	46.937	14.62
11.80	46.788	47.083	14.70
11.83	46.939	47.235	14.15
11.86	47.096	47.393	13.68
11.89	47.254	47.552	12.41
11.92	47.412	47.711	12.35
11.95	47.569	47.869	12.16
12.01	47.885	48.187	11.35
12.04	48.042	48.345	11.45
12.07	48.200	48.504	12.70
12.10	48.327	48.631	14.40
12.13	48.454	48.759	15.00
12.16	48.581	48.887	14.74
12.19	48.708	49.015	14.76
12.22	48.835	49.143	14.77
12.25	48.962	49.270	15.01
12.28	49.089	49.398	14.97
12.31	49.216	49.526	14.86
12.34	49.377	49.688	14.85
12.37	49.570	49.882	14.66
12.40	49.763	50.077	14.75
12.43	49.956	50.271	14.84
12.46	50.149	50.465	15.13
12.49	50.342	50.659	15.02
12.52	50.535	50.853	14.98
12.55	50.728	51.048	15.34
12.58	50.921	51.242	15.18
12.61	51.114	51.436	15.23
12.64	51.307	51.630	15.61
12.67	51.500	51.824	15.33
12.70	51.655	51.980	15.47
12.73	51.811	52.137	14.99
12.76	51.966	52.293	15.44
12.79	52.122	52.450	15.47
12.82	52.277	52.606	15.32
12.85	52.433	52.763	15.30
12.88	52.588	52.919	15.42
12.91	52.743	53.075	15.14
12.94	52.899	53.232	15.63
12.97	53.054	53.388	15.47
13.00	53.210	53.545	15.56
13.03	53.365	53.701	15.32
13.04	53.417	53.754	15.52
13.06	53.521	53.858	15.73
13.09	53.676	54.014	15.07
13.12	53.831	54.170	15.39
13.15	53.987	54.327	15.54
13.18	54.142	54.483	15.62
13.21	54.297	54.639	14.55
13.24	54.450	54.793	13.55
13.27	54.603	54.947	13.83
13.30	54.757	55.102	15.25
13.33	54.910	55.256	15.14
13.36	55.063	55.410	14.68
13.39	55.242	55.590	15.05
13.42	55.370	55.719	14.89
13.45	55.523	55.873	14.65
13.48	55.677	56.028	14.41
13.51	55.830	56.182	14.73
13.54	55.983	56.336	14.08
13.57	56.137	56.491	15.21
13.60	56.290	56.645	15.29
13.63	56.443	56.799	14.56
13.66	56.597	56.954	14.64