Citation:

PANGAEA.930736

Name: Centennial scale denitrification variability based on isotopic and geochemical proxies from the Arabian Sea since the last glacial period
Published: 2021-04-23
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Arabian Sea; Carbon isotopes; Denitrification; Foraminifera abundance; G. bulloides; geochemical archives; global; Monsoons; nitrogen isotope; organic carbon (OC); Paleoceanography; paleoclimatology; Quaternary; Stable isotopes; Teleconnection; ventilation

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Published: 2021-04-23 • DOI registered: 2021-05-27

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Abstract:

Isotopic (nitrogen and carbon isotope ratio of sedimentary organic matter), geochemical (total organic carbon and total nitrogen content of sediment), and micropaleontological (Globigerina bulloides abundance) analyses were done in samples from a marine sediment core. This gravity-core was collected during the 274th cruise of the ORV Sagar Kanya from the Southeastern Arabian Sea. The chronology of the core is based on nine radiocarbon dates obtained using two species of planktic foraminifera (Globigerinoides ruber, Globigerinoides sacculifer; size range: 250–420 μm). It spans the last ~ 43 thousand years and the average resolution is ~150 years. For total organic carbon concentration and carbon isotope ratio estimation, carbonate was removed by treating the sample with 2N hydrochloric acid for 16 hours followed by centrifuging. Given the known problems of loss of nitrogen compounds from the sedimentary organic matter on acidification of samples, resulting in a bias in nitrogen content and nitrogen isotope ratios, untreated samples were used for their analysis. This data was used to study centennial-scale denitrification and productivity variability from the Southeastern Arabian Sea.

Keyword(s):

Arabian Sea; Carbon isotopes; Denitrification; Foraminifera abundance; G. bulloides; geochemical archives; global; Monsoons; nitrogen isotope; organic carbon (OC); Paleoceanography; paleoclimatology; Quaternary; Stable isotopes; Teleconnection; ventilation

Related to:

Nagoji, Sidhesh; Tiwari, Manish (2021): Causes and Climatic Influence of Centennial Scale Denitrification Variability in the Southeastern Arabian Sea since the Last Glacial Period. Quaternary Research, 1-13, https://doi.org/10.1017/qua.2020.118

Coverage:

Latitude: 13.983330 * Longitude: 72.000000

Minimum Elevation: -1290.0 m * Maximum Elevation: -1290.0 m

Event(s):

SK274-4G * Latitude: 13.983330 * Longitude: 72.000000 * Elevation: -1290.0 m * Location: Arabian Sea * Campaign: * Basis: Sagar Kanya * Method/Device: Gravity corer (GC)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	AGE	Age	ka BP	Tiwari, Manish		Geocode
2	Carbon, organic, total	TOC	%	Tiwari, Manish
3	δ13C, total organic carbon	δ13C TOC	‰ PDB	Tiwari, Manish	Isotope Ratio Mass Spectrometer, IsoPrime	vs. VPDB
4	Nitrogen, total	TN	%	Tiwari, Manish
5	δ15N	δ15N	‰ air	Tiwari, Manish	Isotope Ratio Mass Spectrometer, IsoPrime
6	Carbon/Nitrogen ratio	C/N		Tiwari, Manish		atomic

License:

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

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

1280 data points

Data

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

1 Age [ka BP]	2 TOC [%]	3 δ13C TOC [‰ PDB]	4 TN [%]	5 δ15N [‰ air]	6 C/N
0.086	1.70	-19.95	0.15	8.74	13.61
0.351	1.81	-19.92	0.14	8.35	14.85
0.616	1.92	-19.91	0.14	8.36	16.44
0.881	1.74	-19.89	0.15	8.16	13.81
1.147	1.82	-19.78	0.13	8.48	16.83
1.412	1.89	-19.73	0.13	8.53	16.51
1.677	1.69	-19.70	0.13	8.21	15.81
1.943	1.65	-19.67	0.14	8.08	13.58
2.208	1.69	-19.78	0.13	7.99	15.41
2.473	1.73	-19.83	0.12	8.28	16.83
2.738	1.57	-19.85	0.11	8.56	17.27
3.004	1.47	-19.88	0.11	8.06	15.43
3.269	1.32	-19.75	0.10	8.08	16.11
3.534	1.47	-19.90	0.10	7.84	16.29
3.800	1.45	-19.90	0.12	7.68	14.22
4.176	1.31	-19.84	0.09	8.11	16.36
4.552	1.36	-19.53	0.11	7.33	15.09
4.928	1.15	-19.82	0.08	7.61	17.06
5.304	1.15	-19.74	0.08	7.39	17.00
5.680	1.15	-19.65	0.08	7.11	16.38
6.056	1.04	-19.92	0.08	6.66	15.95
6.432	0.92	-19.44	0.07	6.21	15.18
6.809	1.02	-19.59	0.07	6.71	17.11
7.185	0.87	-19.74	0.07	5.99	15.06
7.561	0.84	-19.47	0.07	6.09	13.22
7.937	1.04	-19.69	0.08	6.21	16.12
8.313	1.21	-19.47	0.08	6.32	18.47
8.689	1.04	-19.39	0.06	6.57	18.65
9.065	0.99	-19.46	0.07	6.43	17.43
9.441	0.90	-19.19	0.07	5.93	14.94
9.818	1.13	-19.43	0.08	6.36	15.59
10.194	1.21	-19.67	0.10	6.79	14.20
10.570	1.18	-19.56	0.09	6.83	15.16
10.946	1.15	-19.44	0.08	6.27	16.32
11.322	1.06	-19.21	0.07	5.80	18.19
11.502	1.18	-19.54	0.07	5.92	19.41
11.681	1.15	-19.53	0.07	6.05	18.16
11.861	1.00	-19.60	0.07	5.40	16.89
12.040	1.01	-19.04	0.08	5.41	15.56
12.220	1.01	-19.18	0.06	5.27	18.37
12.399	1.18	-19.47	0.07	5.79	19.87
12.579	1.14	-18.95	0.08	5.52	16.83
12.759	1.35	-19.60	0.08	6.21	20.85
12.938	1.20	-19.23	0.09	5.05	15.66
13.118	1.32	-19.67	0.08	5.36	19.19
13.297	1.26	-19.51	0.08	5.51	18.35
13.477	1.45	-19.33	0.09	5.93	19.53
13.656	1.40	-19.24	0.08	5.94	20.41
13.836	1.41	-19.14	0.09	5.92	18.98
14.016	1.43	-19.51	0.09	6.29	18.25
14.195	1.55	-18.96	0.10	6.66	18.73
14.375	1.70	-19.17	0.10	6.26	20.57
14.554	1.69	-19.40	0.09	6.60	22.59
14.734	1.66	-19.91	0.09	5.86	21.76
14.913	1.49	-19.12	0.09	6.23	19.94
15.093	1.64	-19.67	0.09	6.19	22.29
15.272	1.67	-19.46	0.09	6.20	22.77
15.452	1.69	-19.42	0.10	6.07	20.38
15.632	1.70	-19.21	0.09	6.54	21.85
15.811	1.39	-19.51	0.08	5.97	21.12
15.991	1.41	-19.42	0.08	5.75	21.69
16.170	1.15	-19.54	0.07	5.52	20.51
16.350	1.00	-19.49	0.05	5.04	21.32
16.529	1.09	-19.51	0.06	5.22	21.91
16.709	1.19	-19.69	0.07	4.94	19.82
16.784	1.29	-19.88	0.08	4.91	17.76
16.860	1.24	-19.71	0.06	5.23	22.26
16.935	1.03	-19.36	0.06	5.08	19.99
17.011	1.34	-19.65	0.08	5.19	19.96
17.086	1.13	-19.44	0.07	5.20	18.31
17.162	1.23	-19.56	0.07	5.96	20.27
17.237	1.24	-19.38	0.08	5.51	18.84
17.313	1.25	-19.21	0.09	5.19	16.62
17.388	1.38	-19.02	0.10	4.98	16.35
17.464	1.59	-19.22	0.10	5.35	18.31
17.539	1.58	-18.91	0.12	5.08	15.41
17.615	1.53	-18.78	0.12	5.53	15.42
17.690	1.66	-18.91	0.11	5.59	17.60
17.766	1.63	-18.80	0.11	5.49	16.66
17.841	1.62	-18.84	0.11	5.44	16.74
17.917	1.88	-18.86	0.14	5.75	16.10
17.992	1.96	-18.74	0.13	6.01	17.28
18.067	2.03	-18.91	0.15	5.69	16.04
18.143	2.11	-18.81	0.16	5.59	15.89
18.218	2.14	-18.85	0.16	5.79	15.74
18.294	2.17	-18.94	0.16	5.88	16.30
18.369	2.26	-18.83	0.15	6.44	17.64
18.445	2.28	-18.83	0.16	6.07	16.89
18.520	2.35	-18.93	0.15	6.81	18.25
18.596	2.47	-18.87	0.17	6.03	16.75
18.671	2.50	-18.95	0.17	6.63	17.31
18.747	2.48	-19.08	0.16	6.71	18.62
18.822	2.44	-18.85	0.16	6.46	17.59
18.898	2.50	-18.82	0.18	6.23	16.45
18.973	2.50	-18.88	0.16	6.41	17.88
19.049	2.51	-18.98	0.17	6.41	17.59
19.124	2.67	-19.52	0.18	5.90	17.61
19.200	2.59	-19.21	0.17	6.56	18.03
19.275	2.43	-18.86	0.16	6.30	17.73
19.351	2.50	-18.99	0.16	6.60	17.92
19.455	2.60	-19.03	0.17	6.97	17.76
19.559	2.61	-19.07	0.18	6.77	16.57
19.664	2.59	-18.95	0.20	6.12	14.81
19.768	2.62	-19.03	0.18	6.73	17.35
19.873	2.68	-19.05	0.18	6.38	17.67
19.977	2.73	-19.10	0.17	6.71	18.50
20.081	2.71	-18.99	0.19	6.40	17.08
20.186	2.67	-19.01	0.17	6.73	18.39
20.290	2.71	-19.04	0.16	6.65	19.41
20.395	2.66	-19.04	0.18	6.85	17.24
20.499	2.45	-18.82	0.20	6.18	14.51
20.603	2.49	-18.91	0.18	6.47	16.04
20.708	2.56	-19.36	0.18	6.52	16.71
20.812	2.50	-18.90	0.18	6.53	16.06
20.917	2.23	-18.74	0.17	6.27	15.60
21.021	2.71	-18.89	0.19	5.90	16.46
21.125	2.80	-19.10	0.19	6.13	17.10
21.230	2.72	-18.89	0.19	6.47	16.38
21.334	2.73	-18.91	0.19	6.34	17.20
21.439	2.78	-18.85	0.19	6.41	16.81
21.543	2.34	-18.91	0.17	6.68	16.19
21.647	2.50	-18.86	0.15	6.56	19.08
21.752	2.50	-18.91	0.17	6.64	17.06
21.856	2.51	-18.88	0.18	5.73	16.08
21.961	2.50	-19.07	0.17	6.81	16.87
22.065	2.51	-18.95	0.16	6.78	17.97
22.169	2.40	-18.85	0.16	6.88	17.05
22.274	2.30	-18.80	0.16	6.87	16.43
22.378	2.50	-19.20	0.16	6.56	17.78
22.483	1.97	-18.76	0.15	6.89	15.77
22.587	1.99	-18.86	0.13	6.98	17.71
22.691	2.54	-18.95	0.18	6.06	16.11
22.796	2.60	-19.16	0.18	6.21	17.23
22.900	2.31	-18.82	0.15	6.52	17.67
23.005	2.53	-18.91	0.19	5.99	15.19
23.109	1.94	-18.98	0.13	6.40	17.84
23.213	1.97	-18.97	0.14	5.55	16.00
23.318	1.73	-18.55	0.14	6.41	14.89
23.422	1.79	-18.74	0.12	6.05	16.75
23.527	1.77	-18.71	0.12	6.32	16.53
23.631	1.80	-18.71	0.14	5.58	14.87
23.735	1.95	-19.49	0.14	6.23	16.55
23.840	1.60	-18.61	0.13	6.36	14.36
23.944	1.63	-18.61	0.15	5.80	13.01
24.049	1.86	-18.99	0.13	5.97	17.07
24.153	1.85	-18.97	0.13	6.19	16.42
24.257	1.83	-18.96	0.13	6.43	15.99
24.362	2.09	-18.98	0.15	5.91	16.79
24.466	2.36	-19.01	0.16	6.31	17.73
24.571	2.39	-19.11	0.16	6.13	16.99
24.675	2.15	-18.80	0.16	5.69	15.61
24.818	2.10	-19.07	0.14	6.28	17.12
24.962	2.12	-18.98	0.13	6.36	18.75
25.105	2.10	-19.15	0.16	6.41	15.44
25.249	2.07	-18.85	0.15	6.21	15.63
25.392	2.29	-19.55	0.14	6.24	19.17
25.536	2.01	-18.81	0.15	5.46	15.43
25.679	1.97	-19.06	0.12	6.54	18.55
25.823	2.17	-19.24	0.15	5.72	16.37
25.966	2.10	-18.92	0.15	6.49	16.04
26.110	2.24	-18.98	0.16	5.89	16.17
26.253	2.11	-19.10	0.16	6.17	15.56
26.397	2.31	-19.25	0.15	5.92	18.15
26.540	2.05	-18.65	0.15	6.14	16.15
26.684	1.89	-18.85	0.13	6.16	17.66
26.827	1.90	-18.98	0.14	5.81	15.49
26.971	2.00	-19.15	0.14	5.79	17.13
27.114	2.11	-19.41	0.14	5.83	18.16
27.258	1.69	-18.84	0.12	5.44	16.69
27.401	1.85	-19.09	0.11	6.22	18.94
27.545	1.76	-19.01	0.11	6.18	19.25
27.688	1.66	-19.11	0.11	6.22	17.04
27.832	1.76	-18.80	0.13	6.56	16.16
27.975	1.58	-19.07	0.12	6.88	15.29
28.119	1.66	-18.98	0.12	5.96	15.67
28.262	1.62	-19.15	0.12	5.87	15.52
28.453	1.65	-18.85	0.11	5.99	16.91
28.644	1.52	-19.55	0.12	6.76	14.71
28.835	1.47	-18.81	0.12	6.21	13.72
29.026	1.52	-19.06	0.11	5.66	16.68
29.217	1.46	-19.24	0.12	5.99	14.58
29.408	1.46	-18.92	0.11	5.73	15.82
29.599	1.46	-18.98	0.12	6.09	13.61
29.790	1.49	-19.10	0.11	6.38	16.39
29.981	1.61	-19.25	0.12	5.72	16.05
30.172	1.48	-18.65	0.10	6.59	17.05
30.363	1.60	-18.85	0.12	6.23	15.46
30.554	1.55	-18.98	0.12	6.06	14.98
30.745	1.61	-19.15	0.12	6.31	15.44
30.936	1.60	-19.41	0.12	6.68	16.02
31.127	1.69	-18.71	0.12	6.74	16.20
31.318	1.58	-18.38	0.12	6.04	15.32
31.509	1.64	-18.37	0.12	6.26	15.53
31.700	1.71	-18.51	0.11	6.29	17.44
31.891	1.72	-18.53	0.13	6.30	15.77
32.082	1.56	-18.46	0.10	6.89	17.61
32.273	1.55	-18.33	0.10	6.47	17.23
32.464	1.57	-18.63	0.11	6.39	16.65
32.655	1.59	-18.55	0.12	6.22	15.90
32.847	1.58	-18.43	0.11	6.60	16.05
33.027	1.47	-18.45	0.11	6.27	16.35
33.208	1.84	-18.52	0.11	6.36	19.29
33.388	1.63	-18.59	0.10	6.47	18.68
33.569	1.64	-18.76	0.11	6.72	16.82
33.749	1.60	-18.82	0.11	6.71	16.78
33.930	1.70	-18.84	0.10	6.39	18.92
34.110	1.70	-18.76	0.10	6.62	19.63
34.291	1.64	-18.30	0.10	6.64	20.03
34.472	1.62	-18.31	0.10	6.75	18.05
34.652	1.65	-18.47	0.10	7.15	19.59
34.833	1.58	-18.45	0.10	6.94	18.46
35.013	1.58	-18.38	0.11	6.08	17.42
35.194	1.81	-19.09	0.10	6.35	20.34
35.374	1.71	-18.87	0.09	5.96	21.23
35.555	1.56	-18.44	0.09	6.31	19.79
35.735	1.87	-18.48	0.12	5.93	18.39
35.916	1.71	-18.35	0.10	6.36	19.12
36.097	1.93	-18.69	0.11	6.33	20.06
36.277	2.13	-18.95	0.12	6.64	21.19
36.458	2.01	-18.54	0.12	6.82	19.27
36.638	1.88	-18.64	0.11	7.61	19.91
36.819	2.10	-18.74	0.14	7.52	17.40
36.999	2.04	-18.70	0.14	6.99	16.82
37.180	2.17	-18.99	0.14	7.57	18.09
37.360	2.04	-18.73	0.13	7.52	17.85
37.541	2.13	-18.89	0.14	7.61	17.83
37.722	1.90	-18.69	0.14	6.58	15.71
37.902	2.02	-19.10	0.12	7.66	19.55
38.083	1.75	-19.06	0.13	6.45	15.91
38.263	1.75	-19.10	0.11	6.80	18.34
38.444	1.69	-18.82	0.12	6.08	17.15
38.624	1.46	-18.54	0.11	6.29	16.03
38.805	1.46	-18.66	0.11	6.04	16.15
38.985	1.56	-18.72	0.11	6.22	17.15
39.166	1.31	-18.78	0.10	6.14	15.60
39.347	1.42	-18.80	0.10	6.26	16.08
39.527	1.61	-18.85	0.13	6.00	14.74
39.708	1.79	-18.76	0.14	6.17	15.05
39.888	1.81	-19.16	0.14	5.68	14.67
40.069	2.08	-19.56	0.15	5.90	15.86
40.249	2.19	-19.48	0.14	6.69	18.31
40.430	2.06	-18.79	0.16	6.62	15.02
40.610	2.08	-18.74	0.14	6.91	17.40
40.791	2.13	-18.81	0.14	6.86	17.16
40.972	2.28	-18.85	0.14	6.94	18.81
41.152	2.03	-18.72	0.15	6.67	16.12
41.333	2.39	-18.88	0.15	6.98	18.32
41.513	2.21	-18.70	0.14	6.94	18.24
41.694	2.11	-18.76	0.15	6.95	16.94
41.874	2.15	-18.79	0.16	7.21	15.59
42.055	2.34	-18.80	0.16	7.28	17.36
42.235	2.57	-18.82	0.16	7.17	18.52
42.416	2.29	-18.84	0.15	7.10	17.29
42.597	2.30	-18.86	0.16	7.14	17.18
42.777	2.15	-18.78	0.15	7.03	16.69
42.958	1.99	-18.89	0.13	7.41	17.29