Citation:

j.quascirev.2019.106004

Name: Age model, and raw data of bottom water temperatures (BWT) and stable oxygen isotopes of seawater reconstructions (Mg/Ca, δ18O) using the benthic foraminifera Hyalinea balthica from the Irish Continental Shelf
Published: 2019-10-21
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Hyalinea balthica; Irish Continental Shelf; Northgrippian; Mid-Holocene; Mg/Ca

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Abstract:

There is increasing evidence that accelerated warming at high-latitudes is associated with increased climate variability at mid-latitudes, including the frequency and intensity of storms. However, due to short instrumental records our understanding of how ocean-atmosphere dynamics operate during warmer than present climates remains limited. Here we present a palaeoceanographic investigation of the transition between the middle Holocene intervals of the Northgrippian (8.2 - 4.2 ka) and the late Holocene interval of the Meghalayan (4.2 - 0 ka) to test the hypothesis of an eastward shift of the Icelandic Low under warmer than present climate scenarios. Reconstructions of bottom water temperatures (BWT) and stable oxygen isotopes (Mg/Ca, δ18O) using the benthic foraminifera Hyalinea balthica reveal warmer than present BWT of up to 2.6 ± 0.7°C on the Irish Continental Shelf until circa 4.2 ka. The results suggest that Atlantic waters of subtropical origins were more prevalent in the eastern subpolar gyre (SPG) and on the Irish Continental Shelf. We link this oceanographic signature to an eastward shift of the Icelandic Low. We then place our local temperature record into an extra-regional context, using a combination of modern observations and existing palaeo datasets, which enables us to assess the impact of changing atmospheric modes on ocean-atmosphere climate linkages within the North Atlantic Region. The enhanced influence of warm subtropical Atlantic waters recirculating along the boundaries of the SPG under this scenario, would potentially have enhanced melt rates of marine-terminating glaciers on the east Greenland Shelf during the Northgrippian.

Keyword(s):

Hyalinea balthica; Irish Continental Shelf; Northgrippian; Mid-Holocene; Mg/Ca

Coverage:

Latitude: 52.974330 * Longitude: -9.959330

Date/Time Start: 1999-10-18T14:53:00 * Date/Time End: 1999-10-18T14:53:00

Minimum DEPTH, sediment/rock: 0.0 m * Maximum DEPTH, sediment/rock: 58.0 m

Event(s):

CV15025_GC_07_01 * Latitude: 52.974330 * Longitude: -9.959330 * Date/Time: 1999-10-18T14:53:00 * Elevation: -110.0 m * Recovery: 1.56 m * Campaign: * Basis: Celtic Voyager * Method/Device: Gravity corer (GC)

Comment:

Projects: HazEire Hazards of warm climates; Irish Research Council New Foundations Award 2015/16; National University of Ireland Galway; The Ryan Institute

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m	Morley, Audrey		Geocode
2	AGE	Age	ka BP	Morley, Audrey		Geocode – Raw data
3	Hyalinea balthica, Magnesium/Calcium ratio	H. balthica Mg/Ca	mmol/mol	Morley, Audrey	Measured from H. balthica with ICPMS in solution (Rosenthal et al. 1999)
4	Bottom water temperature	BWT	°C	Morley, Audrey	Calculated from Mg/Ca ratios in Hyalinea balthica	Raw data, (T=MgCa/0.49)
5	Hyalinea balthica, δ18O	H. balthica δ18O	‰ PDB	Morley, Audrey	Micromass Optima mass spectrometer fitted with a Multiprep device	Raw data
6	Hyalinea balthica, δ18O	H. balthica δ18O	‰ PDB	Morley, Audrey	Calculated following Fairbanks (1989)	Corrected for global ice volume changes
7	δ18O, seawater, reconstructed	δ18Osw	‰ SMOW	Morley, Audrey	Calculated from Mg/Ca ratios and d18O corrected
8	Paleosalinity	PalSal	‰	Morley, Audrey	Calculated from δ18Osw	Calculated from δ18Osw following δ18Osw = (S*0.597) -20.685 developed by Austin et al. 2006

License:

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

Size:

660 data points

Data

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

1 Depth sed [m]	2 Age [ka BP] (Raw data)	3 H. balthica Mg/Ca [mmol/mol] (Measured from H. balthica wit...)	4 BWT [°C] (Raw data, (T=MgCa/0.49), Calc...)	5 H. balthica δ18O [‰ PDB] (Raw data, Micromass Optima ma...)	6 H. balthica δ18O [‰ PDB] (Corrected for global ice volu...)	7 δ18Osw [‰ SMOW] (Calculated from Mg/Ca ratios ...)	8 PalSal [‰] (Calculated from δ18Osw follow...)
0.0	0.96	5.17	10.35	1.40	1.38	0.59	35.62
0.5	0.98	5.64	11.28	1.25	1.22	0.62	35.68
1.0	1.01	5.42	10.84	1.33	1.31	0.62	35.67
1.5	1.03	5.26	10.51	1.16	1.14	0.38	35.27
2.0	1.06	5.25	10.50	1.14	1.11	0.35	35.22
2.5	1.08	5.39	10.77	1.23	1.21	0.50	35.48
3.0	1.10	5.09	10.17	1.21	1.18	0.35	35.22
3.5	1.13	5.19	10.38	1.23	1.20	0.42	35.33
4.0	1.15	5.40	10.80	1.22	1.19	0.49	35.46
4.5	1.18	5.61	11.23	1.22	1.20	0.59	35.62
5.0	1.20	5.52	11.03	1.13	1.10	0.45	35.39
5.5	1.22	5.39	10.78	1.19	1.16	0.46	35.41
6.0	1.25	5.94	11.87	1.23	1.20	0.73	35.86
6.5	1.27	5.78	11.56	1.23	1.20	0.66	35.75
7.0	1.29	5.44	10.88	1.27	1.24	0.56	35.58
7.5	1.32	4.92	9.84	1.23	1.20	0.30	35.15
8.0	1.35	5.52	11.03	1.35	1.32	0.67	35.76
8.5	1.37	5.73	11.46	1.44	1.41	0.85	36.06
9.0	1.39	5.18	10.37	1.19	1.16	0.37	35.26
9.5	1.42	5.57	11.14	1.14	1.11	0.48	35.44
10.0	1.44	5.47	10.94	1.31	1.28	0.61	35.67
10.5	1.46	5.43	10.86	1.34	1.30	0.62	35.67
11.0	1.49	5.33	10.66	1.40	1.37	0.64	35.71
11.5	1.51	5.72	11.45	1.27	1.24	0.68	35.77
12.0	1.53	6.02	12.04	1.11	1.08	0.64	35.71
12.5	1.56	5.03	10.07	1.15	1.11	0.26	35.08
13.0	1.58	5.68	11.36	1.28	1.25	0.67	35.76
13.5	1.61	5.72	11.44	1.08	1.05	0.48	35.45
14.0	1.63	5.68	11.36	1.21	1.17	0.59	35.63
14.5	1.65	5.69	11.38	1.26	1.23	0.65	35.73
15.0	1.68	6.27	12.54	1.03	1.00	0.66	35.74
15.5	1.70	5.58	11.16	1.06	1.02	0.40	35.31
16.0	1.72	5.98	11.97	1.03	1.00	0.55	35.55
16.5	1.75	5.68	11.35	1.03	1.00	0.42	35.34
17.5	1.80	6.27	11.15	1.32	1.28	0.66	35.74
18.0	1.82	5.91	11.82	1.22	1.19	0.70	35.82
19.0	1.87	5.54	11.08	1.40	1.36	0.72	35.84
20.0	1.92	6.25	12.50	1.17	1.13	0.79	35.96
20.5	1.94	5.79	11.57	1.36	1.32	0.79	35.95
21.0	1.96	5.87	11.75	1.04	1.01	0.51	35.49
21.5	1.99	5.54	11.07	1.20	1.16	0.52	35.50
22.5	2.04	5.55	11.09	1.55	1.51	0.87	36.10
23.0	2.06	5.55	11.10	1.35	1.31	0.67	35.76
23.5	2.09	5.65	11.30	1.38	1.34	0.75	35.89
24.0	2.11	5.51	11.02	1.60	1.56	0.91	36.16
24.5	2.14	5.42	10.83	1.31	1.27	0.58	35.60
25.0	2.16	6.45	12.90	1.44	1.40	1.14	36.54
25.5	2.19	5.71	11.41	1.32	1.28	0.71	35.83
26.0	2.22	5.95	11.90	1.23	1.19	0.72	35.84
26.5	2.24	6.05	12.10	1.26	1.21	0.79	35.96
27.0	2.27	5.76	11.52	1.28	1.24	0.69	35.79
27.5	2.30	6.00	12.00	1.49	1.44	1.00	36.31
28.0	2.32	6.43	12.85	1.37	1.33	1.06	36.41
28.5	2.35	6.23	12.47	1.48	1.43	1.08	36.45
29.0	2.37	6.41	12.82	1.46	1.42	1.14	36.55
29.5	2.40	6.40	12.81	1.30	1.26	0.98	36.27
30.0	2.42	5.97	11.94	1.42	1.38	0.92	36.18
30.5	2.45	5.97	11.95	1.13	1.09	0.63	35.69
31.0	2.48	6.03	12.07	1.20	1.16	0.72	35.85
31.5	2.50	5.68	11.36	1.15	1.10	0.52	35.51
32.0	2.53	5.56	11.12	1.27	1.23	0.60	35.64
32.5	2.55	5.83	11.66	1.34	1.30	0.78	35.95
33.0	2.58	5.75	11.50	1.26	1.22	0.66	35.75
33.5	2.69	5.77	11.54	1.09	1.04	0.50	35.47
34.0	2.80	5.96	11.92	1.34	1.29	0.82	36.02
34.5	2.91	5.80	11.60	1.22	1.17	0.64	35.70
35.0	3.02	5.73	11.46	1.25	1.20	0.64	35.71
35.5	3.13	6.24	12.49	1.17	1.12	0.77	35.93
36.0	3.24	5.99	11.99	1.14	1.08	0.63	35.70
36.5	3.35	6.37	12.74	1.03	0.97	0.68	35.77
37.0	3.46	6.05	12.09	1.19	1.13	0.70	35.81
37.5	3.57	5.92	11.84	1.14	1.08	0.60	35.64
38.0	3.68	6.19	12.38	1.04	0.97	0.60	35.65
38.5	3.78	5.57	11.13	1.05	0.99	0.36	35.24
39.0	3.88	6.42	12.85	1.05	0.98	0.71	35.82
39.5	3.98	5.89	11.78	1.17	1.10	0.61	35.65
40.0	4.09	6.27	12.53	1.13	1.05	0.72	35.84
40.5	4.19	6.62	13.24	1.28	1.20	1.01	36.33
41.0	4.29	5.83	11.66	1.15	1.07	0.55	35.56
41.5	4.39	5.79	11.58	1.02	0.94	0.40	35.31
42.0	4.49	6.55	13.10	1.18	1.09	0.87	36.10
42.5	4.59	5.81	11.62	1.00	0.91	0.39	35.29
43.0	4.69	6.31	12.61	1.20	1.10	0.78	35.95
43.5	4.80	5.82	11.65	1.02	0.92	0.40	35.31
44.0	4.91	6.47	12.94	1.12	1.02	0.77	35.93
44.5	5.01	5.78	11.56	1.05	0.95	0.41	35.33
45.5	5.23	6.17	12.33	1.24	1.13	0.75	35.89
46.0	5.33	6.09	12.17	1.12	1.01	0.59	35.63
46.5	5.44	5.80	11.61	1.26	1.14	0.61	35.66
47.0	5.55	5.94	11.88	1.27	1.15	0.68	35.78
47.5	5.65	6.20	12.40	1.31	1.19	0.82	36.01
48.0	5.76	5.83	11.67	1.25	1.12	0.60	35.64
48.5	5.86	6.19	12.38	1.17	1.03	0.67	35.75
49.0	5.96	5.90	11.80	1.22	1.08	0.59	35.63
49.5	6.07	5.93	11.86	1.11	0.96	0.49	35.46
50.0	6.17	5.96	11.93	1.25	1.10	0.63	35.70
50.5	6.27	5.88	11.75	1.36	1.21	0.71	35.82
51.0	6.38	5.99	11.98	1.22	1.06	0.61	35.66
51.5	6.48	6.06	12.11	1.33	1.17	0.74	35.88
52.0	6.58	5.89	11.79	1.31	1.14	0.65	35.73
52.5	6.68	5.84	11.69	1.20	1.02	0.51	35.49
53.5	6.87	5.66	11.31	1.05	0.86	0.27	35.09
54.0	6.95	5.90	11.80	1.41	1.22	0.73	35.86
54.5	7.03	5.73	11.47	1.23	1.03	0.47	35.43
55.5	7.20	5.61	11.23	1.05	0.84	0.23	35.02
56.0	7.28	5.95	11.90	1.13	0.91	0.45	35.38
56.5	7.36	6.00	12.00	1.30	1.08	0.63	35.69
57.0	7.45	5.98	11.96	1.34	1.12	0.66	35.74
57.5	7.53	6.11	12.21	1.08	0.84	0.44	35.37
58.0	7.61	5.78	11.57	1.19	0.95	0.41	35.32