/* DATA DESCRIPTION:
Citation:	Singh, Dharmendra Pratap (2026): Basin-scale Arabian Sea denitrification reconstruction based on δ¹⁵N records, Southern Arabian Sea Stack [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.993906 (DOI registration in progress), 
	In: Singh, DP (2026): Basin-scale Arabian Sea denitrification reconstruction based on δ¹⁵N records including core SSD004 GC11 [dataset bundled publication]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.993898 (DOI registration in progress)
Abstract:	The new δ¹⁵N record of sediment core SSD004_GC11 is combined with published regional datasets to produce a basin-wide Arabian Sea denitrification stack. Spectral and cross-wavelet analyses reveal dominant orbital-scale variability, with stronger obliquity influence in the southern basin and precession dominance in northern records. Coherent variability between δ¹⁵N records and atmospheric N₂O concentrations highlights orbital forcing as a key driver of long-term nitrogen cycling and greenhouse gas variability.
Keyword(s):	Arabian Sea; d15N; Sedimentary geochemistry; Stack; TN
Related to:	Pawar, Rahul; Singh, Dharmendra Pratap; Saraswat, Rajeev; Maurya, A S (2026): Orbital forcing regulated Arabian Sea denitrification during the late Pleistocene. Global and Planetary Change, 259, 105373, https://doi.org/10.1016/j.gloplacha.2026.105373
References:	Isaji, Yuta; Kawahata, Hodaka; Ohkouchi, Naohiko; Ogawa, Nanako O; Murayama, Masafumi; Inoue, Kazuki; Tamaki, Kensaku (2015): Varying responses to I ndian monsoons during the past 220 kyr recorded in deep‐sea sediments in inner and outer regions of the G ulf of A den. Journal of Geophysical Research: Oceans, 120(11), 7253-7270, https://doi.org/10.1002/2015JC010982
	Ivanochko, Tara S; Ganeshram, Raja S; Brummer, Geert-Jan A; Ganssen, Gerald M; Jung, S J A; Moreton, Stephen; Kroon, Dick (2005): Variations in tropical convection as an amplifier of global climate change at the millennial scale. Earth and Planetary Science Letters, 235(1-2), 302-314, https://doi.org/10.1016/j.epsl.2005.04.002
	Suthhof, Andreas; Ittekkot, Venugopalan; Gaye-Haake, Birgit (2001): Millennial‐scale oscillation of denitrification intensity in the Arabian Sea during the Late Quaternary and its potential influence on atmospheric N 2 O and global climate. Global Biogeochemical Cycles, 15(3), 637-649, https://doi.org/10.1029/2000GB001337
	Tesdal, J-E; Galbraith, Eric Douglas; Kienast, Markus (2013): NOAA/WDS Paleoclimatology - NICOPP Global Ocean Sediment Nitrogen Isotope Database [dataset]. NOAA National Centers for Environmental Information, https://doi.org/10.25921/W9CA-1Z10
	Tiwari, Manish; Ramesh, R; Bhushan, Ravi; Sheshshayee, Madavalm S; Somayajulu, Bammidipati L K; Jull, A J Timothy; Burr, George S (2010): Did the Indo‐Asian summer monsoon decrease during the Holocene following insolation? Journal of Quaternary Science, 25(7), 1179-1188, https://doi.org/10.1002/jqs.1398
Additional metadata:	Arabian Sea cores, references and chronology (URI: https://download.pangaea.de/reference/139702/attachments/References_chronology.xlsx)
Funding:	Science and Engineering Research Board (SERB), grant/award no. SRG/2021/000620
Coverage:	MEDIAN LATITUDE: 12.070917 * MEDIAN LONGITUDE: 57.029083 * SOUTH-BOUND LATITUDE: 6.000000 * WEST-BOUND LONGITUDE: 46.932300 * NORTH-BOUND LATITUDE: 14.983000 * EAST-BOUND LONGITUDE: 78.931200
	DATE/TIME START: 1986-05-24T00:00:00 * DATE/TIME END: 1986-05-24T00:00:00
	MINIMUM ELEVATION: -3212.0 m * MAXIMUM ELEVATION: -1474.0 m
Event(s):	GOA4 * LATITUDE: 12.821500 * LONGITUDE: 46.932300 * ELEVATION: -1474.0 m * METHOD/DEVICE: Sediment corer (SEDCO)
	GOA6 * LATITUDE: 14.983000 * LONGITUDE: 53.767000 * ELEVATION: -2416.0 m * METHOD/DEVICE: Sediment corer (SEDCO)
	NIOP_905 * LATITUDE: 10.920000 * LONGITUDE: 51.940000 * LOCATION: Arabian Sea
	SO42-74KL (KL-74, AS-12) * LATITUDE: 14.321000 * LONGITUDE: 57.347000 * DATE/TIME: 1986-05-24T00:00:00 * ELEVATION: -3212.0 m * RECOVERY: 3.16 m * LOCATION: Arabian Sea * CAMPAIGN: SO42 * BASIS: Sonne (URI: https://en.wikipedia.org/wiki/RV_Sonne) * METHOD/DEVICE: Kasten corer (KAL)
	SS4018G * LATITUDE: 13.380000 * LONGITUDE: 53.257000 * ELEVATION: -2830.0 m * METHOD/DEVICE: Sediment corer (SEDCO)
	SSD004_GC11 * LATITUDE: 6.000000 * LONGITUDE: 78.931200 * ELEVATION: -2901.0 m * BASIS: Sindhu Sadhana (URI: https://www.nio.res.in/research/research-vessels/rv-sindhu-sadhana) * METHOD/DEVICE: Gravity corer (GC)
Parameter(s):	AGE [ka BP] (Age) * GEOCODE * PI: Singh, Dharmendra Pratap (https://orcid.org/0000-0001-5563-1633, dharmendra.singh@es.iitr.ac.in)
	δ15N, bulk sediment [‰ air] (δ15N bulk) * PI: Singh, Dharmendra Pratap (https://orcid.org/0000-0001-5563-1633, dharmendra.singh@es.iitr.ac.in) * METHOD/DEVICE: Stacked * COMMENT: Southern Arabian Sea Stack
	δ15N, standard deviation [±] (δ15N std dev) * PI: Singh, Dharmendra Pratap (https://orcid.org/0000-0001-5563-1633, dharmendra.singh@es.iitr.ac.in) * METHOD/DEVICE: calculated, 1 sigma
License:	Creative Commons Attribution 4.0 International (CC-BY-4.0) (URI: https://creativecommons.org/licenses/by/4.0/)
Status:	Curation Level: Enhanced curation (URI: https://wiki.pangaea.de/wiki/Curation_levels)
Size:	349 data points
*/
Age [ka BP]	δ15N bulk [‰ air]	δ15N std dev [±]
0.1	0.93	
1.1	0.46	0.60
2.1	0.29	0.56
3.1	0.56	0.17
4.1	0.49	0.63
5.1	0.62	0.37
6.1	0.49	0.53
7.1	0.70	0.35
8.1	0.71	0.42
9.1	0.84	0.51
10.1	1.12	0.66
11.1	1.06	0.90
12.1	0.76	0.74
13.1	0.46	0.84
14.1	0.54	0.63
15.1	-0.07	0.86
16.1	-0.03	0.77
17.1	-0.44	0.24
18.1	-0.69	0.29
19.1	-0.51	0.27
20.1	-0.29	0.40
21.1	-0.37	0.45
22.1	-0.44	0.30
23.1	-0.47	0.25
24.1	-0.68	0.56
25.1	-0.57	0.12
26.1	-0.34	0.24
27.1	-0.38	0.38
28.1	-0.42	0.16
29.1	-0.42	0.40
30.1	-0.62	0.75
31.1	-0.43	0.44
32.1	0.16	0.37
33.1	-0.12	0.28
34.1	-0.34	0.52
35.1	0.11	0.30
36.1	-0.06	0.26
37.1	0.28	0.29
38.1	0.33	0.49
39.1	-0.38	0.51
40.1	-0.25	0.26
41.1	0.24	0.55
42.1	0.40	0.60
43.1	0.02	0.27
44.1	0.37	0.48
45.1	0.65	0.78
46.1	0.42	0.54
47.1	0.42	0.52
48.1	0.65	0.43
49.1	0.64	0.19
50.1	0.76	0.37
51.1	0.82	0.27
52.1	0.56	0.35
53.1	0.55	0.31
54.1	0.50	0.33
55.1	0.50	0.65
56.1	0.68	0.60
57.1	-0.14	0.69
58.1	-0.56	0.94
59.1	-0.45	0.56
60.1	-0.79	0.68
61.1	-0.99	0.73
62.1	-1.11	0.77
63.1	-1.04	0.62
64.1	-1.09	0.63
65.1	-1.21	0.66
66.1	-0.90	0.33
67.1	-0.55	0.69
68.1	-0.48	0.78
69.1	-1.03	0.41
70.1	-0.36	1.14
71.1	-0.35	1.20
72.1	-0.38	0.84
73.1	-0.46	0.28
74.1	-0.19	0.17
75.1	-0.03	0.31
76.1	0.26	0.24
77.1	0.33	0.54
78.1	0.32	0.49
79.1	0.34	0.58
80.1	0.55	0.47
81.1	0.52	0.36
82.1	0.37	0.15
83.1	0.38	0.23
84.1	-0.13	0.48
85.1	-0.23	0.62
86.1	-0.25	0.77
87.1	-0.11	0.68
88.1	0.15	0.74
89.1	0.24	0.76
90.1	0.34	0.75
91.1	0.42	0.77
92.1	0.49	0.57
93.1	0.55	0.49
94.1	0.42	0.65
95.1	0.56	0.51
96.1	0.50	0.60
97.1	0.20	0.56
98.1	0.25	0.57
99.1	-0.21	0.70
100.1	-0.41	0.79
101.1	-0.51	0.79
102.1	-0.57	0.72
103.1	-0.58	0.62
104.1	-0.55	0.51
105.1	-0.49	0.49
106.1	-0.39	0.43
107.1	-0.29	0.39
108.1	-0.38	0.59
109.1	-0.23	0.46
110.1	-0.24	0.57
111.1	0.05	0.27
112.1	0.11	0.36
113.1	0.24	0.35
114.1	0.44	0.21
115.1	0.27	0.46
116.1	0.30	0.38
117.1	0.41	0.18
118.1	0.28	0.39
119.1	0.46	0.14
120.1	0.44	0.12
121.1	0.36	0.06
122.1	0.28	0.07
123.1	0.14	0.19
124.1	0.03	0.28
125.1	0.12	0.30
126.1	-0.02	0.39
127.1	-0.07	0.52
128.1	-0.08	0.68
129.1	0.14	0.75
130.1	0.21	0.64
131.1	0.26	0.53
132.1	0.20	0.43
133.1	0.21	0.68
134.1	0.33	0.29
135.1	0.14	0.31
136.1	0.12	0.54
137.1	0.12	0.77
138.1	0.00	0.90
139.1	0.06	0.74
140.1	0.06	0.64
141.1	0.09	0.60
142.1	0.19	0.61
143.1	0.11	0.58
144.1	0.25	0.95
145.1	-0.02	0.85
146.1	-0.35	0.69
147.1	-0.43	0.99
148.1	-0.75	0.86
149.1	-0.81	0.77
150.1	-0.78	0.83
151.1	-0.51	1.18
152.1	-0.90	0.54
153.1	-0.92	0.55
154.1	-0.72	0.85
155.1	-0.78	0.77
156.1	-0.54	0.83
157.1	-0.39	0.75
158.1	-0.37	0.66
159.1	-0.15	0.87
160.1	-0.03	0.96
161.1	-0.04	0.90
162.1	0.05	0.95
163.1	-0.14	0.73
164.1	0.37	1.08
165.1	0.33	0.90
166.1	0.57	1.04
167.1	0.37	0.78
168.1	0.24	0.90
169.1	0.23	0.72
170.1	0.21	0.55
171.1	0.19	0.37
172.1	0.19	0.21
173.1	0.19	0.06
174.1	0.18	0.06