Citation:

j.jseaes.2013.01.014

Name: Age model, oxygen isotopes and Mg/Ca ratios of Globigerinoides ruber from sediment core ORI715-21 off the Kuroshio Current, eastern Taiwan
Published: 2019-03-11
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Holocene; Kuroshio Current; Mindanao Current; North Equatorial Current; Northwestern Pacific; Sea surface temperature; Seawater δ18O

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Abstract:

To understand Holocene climate evolutions in low-latitude region of the western Pacific, paired δ18O and Mg/Ca records of planktonic foraminifer Globigerinoides ruber (250-300 μm, sensu stricto, s.s.) from a marine core ORI715-21 (121.5°E, 22.7°N, water depth 760 m) underneath the Kuroshio Current (KC) off eastern Taiwan were analyzed. Over the past 7500 years, the geochemical proxy-inferred sea surface temperature (SST) hovered around 27-28 °C and seawater δ18O (δ18OW) slowly decreased 0.2-0.4‰ for two KC sites at 22.7° and 25.3°N. Comparison with a published high-SST and high-salinity equatorial tropical Pacific record, MD98-2181 located at the Mindanao Current (MC) at 6.3°N, reveals an anomalous time interval at 3.5-1.5 kyr ago (before 1950 AD). SST gradient between the MC site and two KC site decrease from 1.5-2.0 °C to only 0-1 °C, and δ18OW from 0.1-0.3‰ to 0‰ for this 2-kyr time window. The high SST and low gradient could result from a northward shift of the North Equatorial Current, which implies a weakened KC. The long-term descending δ18OW and increasing precipitation in the entire low-latitude western Pacific and the gradually decreasing East Asian summer monsoonal rainfall during middle-to-late Holocene is likely caused by different land and ocean responses to solar insolation and/or enhanced moisture transportation from the Atlantic to Pacific associated with the southward movement of ITCZ.

Keyword(s):

Holocene; Kuroshio Current; Mindanao Current; North Equatorial Current; Northwestern Pacific; Sea surface temperature; Seawater δ18O

Coverage:

Latitude: 22.700000 * Longitude: 121.500000

Minimum Elevation: -760.0 m * Maximum Elevation: -760.0 m

Event(s):

ORI715-21 * Latitude: 22.700000 * Longitude: 121.500000 * Elevation: -760.0 m * Location: Kuroshio Current * Method/Device: Core (CORE)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Comment
1	AGE	Age	ka BP	Lo, Li	Geocode
2	Globigerinoides ruber, Magnesium/Calcium ratio	G. ruber Mg/Ca	mmol/mol	Lo, Li
3	Sea surface temperature	SST	°C	Lo, Li
4	Globigerinoides ruber, δ18O	G. ruber δ18O	‰ PDB	Lo, Li	d18Oc, VPDB
5	δ18O, seawater, reconstructed	δ18Osw	‰ SMOW	Lo, Li	d18Ow, VSMOW
6	Sea surface salinity	SSS		Lo, Li

License:

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

Size:

455 data points

Data

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

1 Age [ka BP]	2 G. ruber Mg/Ca [mmol/mol]	3 SST [°C]	4 G. ruber δ18O [‰ PDB]	5 δ18Osw [‰ SMOW]	6 SSS
0.00	4.647	27.4	-2.680	0.19	33.9
0.30	4.768	27.7	-3.012	-0.08	33.1
0.39	4.463	26.9	-2.814	-0.04	33.3
0.49	4.531	27.1	-2.840	-0.03	33.3
0.59	4.251	26.4	-2.947	-0.28	32.5
0.69	4.466	26.9	-2.736	0.04	33.5
0.79	4.378	26.7	-2.816	-0.08	33.1
0.89	4.677	27.5	-2.727	0.16	33.8
0.93	4.916	28.0	-2.711	0.29	34.2
0.97	4.156	26.2	-2.704	-0.09	33.1
1.01	4.715	27.6	-2.736	0.17	33.9
1.05	4.725	27.6	-2.793	0.12	33.7
1.09	4.856	27.9	-2.782	0.19	33.9
1.13	4.777	27.7	-2.800	0.14	33.8
1.17	5.069	28.4	-2.924	0.15	33.8
1.22	4.901	28.0	-2.482	0.51	34.9
1.33	4.738	27.6	-2.601	0.32	34.3
1.45	4.634	27.4	-2.709	0.16	33.8
1.57	4.883	27.9	-2.845	0.14	33.8
1.68	4.555	27.2	-2.649	0.18	33.9
1.80	5.015	28.2	-2.705	0.34	34.4
1.92	4.993	28.2	-2.722	0.32	34.3
2.04	4.961	28.1	-2.723	0.30	34.3
2.15	4.622	27.3	-2.677	0.18	33.9
2.31	4.524	27.1	-2.769	0.04	33.5
2.46	5.028	28.3	-2.786	0.27	34.2
2.61	4.780	27.7	-2.628	0.31	34.3
2.76	4.524	27.1	-2.902	-0.09	33.1
2.91	4.880	27.9	-2.599	0.39	34.5
3.07	5.256	28.8	-2.533	0.62	35.3
3.22	4.699	27.5	-2.738	0.16	33.8
3.37	4.843	27.8	-2.461	0.51	34.9
3.43	4.677	27.5	-3.077	-0.19	32.8
3.50	4.571	27.2	-2.513	0.32	34.3
3.56	4.544	27.1	-2.625	0.19	34.0
3.62	4.259	26.4	-2.745	-0.07	33.1
3.69	4.491	27.0	-2.572	0.22	34.0
3.75	4.474	27.0	-2.700	0.08	33.6
3.81	4.905	28.0	-3.208	-0.21	32.7
3.88	4.653	27.4	-2.657	0.22	34.0
3.94	4.584	27.2	-2.468	0.37	34.5
4.00	4.941	28.1	-2.446	0.57	35.1
4.07	4.674	27.5	-2.420	0.47	34.8
4.13	4.587	27.2	-2.781	0.06	33.5
4.19	4.495	27.0	-2.647	0.15	33.8
4.26	4.496	27.0	-2.719	0.08	33.6
4.32	4.864	27.9	-2.472	0.51	34.9
4.37	4.662	27.4	-2.670	0.21	34.0
4.41	5.093	28.4	-2.517	0.57	35.1
4.48	4.641	27.4	-2.668	0.20	34.0
4.56	4.708	27.5	-2.689	0.21	34.0
4.65	4.377	26.7	-2.442	0.29	34.2
4.73	5.150	28.5	-2.743	0.37	34.5
4.82	4.370	26.7	-2.801	-0.07	33.1
4.90	4.866	27.9	-2.539	0.44	34.7
4.99	4.594	27.3	-2.513	0.33	34.4
5.07	4.622	27.3	-2.568	0.29	34.2
5.16	4.649	27.4	-2.328	0.55	35.0
5.24	4.338	26.6	-2.694	0.02	33.4
5.33	4.495	27.0	-2.678	0.12	33.7
5.41	4.165	26.2	-2.597	0.02	33.4
5.50	4.657	27.4	-2.565	0.31	34.3
5.58	4.411	26.8	-2.562	0.19	33.9
5.67	4.072	25.9	-2.721	-0.15	32.9
5.75	4.905	28.0	-2.577	0.42	34.6
5.84	4.753	27.6	-2.344	0.58	35.1
5.92	4.633	27.4	-2.601	0.26	34.2
6.01	4.379	26.7	-2.606	0.13	33.8
6.09	5.133	28.5	-2.583	0.52	34.9
6.15	5.090	28.4	-2.531	0.55	35.0
6.27	4.285	26.5	-2.410	0.27	34.2
6.33	4.505	27.0	-2.632	0.17	33.9
6.38	4.795	27.7	-2.485	0.46	34.8
6.44	4.802	27.8	-2.384	0.56	35.1
6.50	4.433	26.9	-2.056	0.71	35.5
6.56	4.859	27.9	-2.574	0.40	34.6
6.62	4.285	26.5	-2.377	0.31	34.3
6.68	4.560	27.2	-2.738	0.09	33.6
6.79	4.493	27.0	-2.536	0.26	34.1
6.84	4.335	26.6	-2.076	0.64	35.3
6.90	4.408	26.8	-2.491	0.26	34.1
6.96	4.647	27.4	-2.248	0.62	35.3
7.02	4.413	26.8	-2.515	0.24	34.1
7.07	4.976	28.1	-2.574	0.46	34.7
7.13	4.634	27.4	-2.753	0.11	33.7
7.19	4.514	27.1	-2.326	0.48	34.8
7.25	4.606	27.3	-2.276	0.58	35.1
7.31	4.750	27.6	-2.338	0.59	35.1
7.36	4.535	27.1	-2.771	0.04	33.5
7.42	4.320	26.6	-2.035	0.67	35.4
7.48	4.542	27.1	-2.158	0.66	35.4