Citation:

PANGAEA.993898 (DOI registration in progress)

Name: Basin-scale Arabian Sea denitrification reconstruction based on δ¹⁵N records, Northern Arabian Sea Stack
Creator: Dharmendra Pratap Singh
Published: 2026-04-29
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Arabian Sea; d15N; Sedimentary geochemistry; Stack; TN

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Published: 2026-04-29

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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:

Jaeschke, Andrea; Ziegler, Martin; Hopmans, Ellen C; Reichart, Gert-Jan; Lourens, Lucas Joost; Schouten, Stefan; Sinninghe Damsté, Jaap S (2009): Molecular fossil evidence for anaerobic ammonium oxidation in the Arabian Sea over the last glacial cycle. Paleoceanography, 24(2), PA2202, https://doi.org/10.1029/2008PA001712

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

Pichevin, Laetitia; Bard, Edouard; Martinez, Philippe; Billy, Isabelle (2007): Evidence of ventilation changes in the Arabian Sea during the late Quaternary: Implication for denitrification and nitrous oxide emission. Global Biogeochemical Cycles, 21, GB4008, https://doi.org/10.1029/2006GB002852

Reichart, Gert-Jan; Lourens, Lucas Joost; Zachariasse, Willem-Jan (1998): Temporal variability in the northern Arabian Sea oxygen minimum zone (OMZ) during the last 225,000 years. Paleoceanography, 13(6), 607-621, https://doi.org/10.1029/98PA02203

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

References:

Jaeschke, Andrea; Ziegler, Martin; Hopmans, Ellen C; Reichart, Gert-Jan; Lourens, Lucas Joost; Schouten, Stefan; Sinninghe Damsté, Jaap S (2009): Figure 4. Geochemistry on sediment core MD04-2879 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.742495

Pichevin, Laetitia; Bard, Edouard; Martinez, Philippe; Billy, Isabelle (2007): Biogeochemical investigations on sediment core MD04-2876 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.727157

Reichart, Gert-Jan; Lourens, Lucas Joost; Zachariasse, Willem-Jan (1998): Organic carbon content, stable isotopes and planktonic foraminifera in sediments of tghe norther Arabian Sea oxygen minimum zone [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.857398

Additional metadata:

Arabian Sea cores, references and chronology

Funding:

Science and Engineering Research Board (SERB), grant/award no. SRG/2021/000620

Coverage:

Median Latitude: 22.716578 * Median Longitude: 64.959477 * South-bound Latitude: 19.999000 * West-bound Longitude: 63.585000 * North-bound Latitude: 24.842830 * East-bound Longitude: 66.483000

Date/Time Start: 1992-10-06T00:00:00 * Date/Time End: 2004-09-21T00:00:00

Minimum Elevation: -3167.0 m * Maximum Elevation: -775.0 m

Event(s):

MD04-2876 * Latitude: 24.842830 * Longitude: 64.008160 * Elevation: -828.0 m * Recovery: 33 m * Location: Pakistan continental margin * Campaign: (CHAMAK) * Basis: * Method/Device: Calypso Corer (CALYPSO) * Comment: located within the present day OMZ (oxygen minimum zone)

MD04-2879CQ * Latitude: 22.548300 * Longitude: 64.046700 * Date/Time: 2004-09-21T00:00:00 * Elevation: -920.0 m * Location: Gulf of Oman * Campaign: (CHAMAK) * Basis: * Method/Device: Calypso square corer (CASQ)

ME33-NAST * Latitude: 19.999000 * Longitude: 65.684000 * Elevation: -3167.0 m * Method/Device: Sediment corer (SEDCO)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	AGE	Age	ka BP	Singh, Dharmendra Pratap		Geocode
2	δ15N, bulk sediment	δ15N bulk	‰ air	Singh, Dharmendra Pratap	Stacked	Northern Arabian Sea Stack
3	δ15N, standard deviation	δ15N std dev	±	Singh, Dharmendra Pratap	calculated, 1 sigma

License:

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

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

311 data points

Data

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

1 Age [ka BP]	2 δ15N bulk [‰ air]	3 δ15N std dev [±]
0.1	2.10	0.33
1.1	1.89	0.66
2.1	1.89	0.72
3.1	1.68	1.13
4.1	1.39	1.01
5.1	1.05	0.97
6.1	1.19	0.51
7.1	0.93	0.48
8.1	0.49	0.63
9.1	0.56	0.76
10.1	0.74	1.12
11.1	0.33	1.25
12.1	-0.14	1.01
13.1	0.62	0.57
14.1	0.29	1.34
15.1	-0.65	0.89
16.1	-0.86	0.87
17.1	-1.01	0.80
18.1	-0.66	0.34
19.1	-0.44	0.47
20.1	-0.55	0.45
21.1	-0.46	0.42
22.1	-0.35	0.32
23.1	-0.62	0.98
24.1	-0.81	0.28
25.1	-0.79	0.29
26.1	-0.82	0.37
27.1	-0.84	0.66
28.1	-1.13	0.48
29.1	-1.07	0.59
30.1	-0.82	0.49
31.1	-0.68	0.53
32.1	-0.47	0.38
33.1	-0.18	0.67
34.1	0.11	1.07
35.1	0.80	0.69
36.1	0.10	0.60
37.1	0.17	1.36
38.1	0.23	1.22
39.1	-0.31	0.89
40.1	-0.07	1.20
41.1	0.26	1.24
42.1	0.50	1.07
43.1	-0.25	0.84
44.1	0.23	0.98
45.1	0.31	1.51
46.1	0.16	1.02
47.1	0.69	0.91
48.1	1.19	1.04
49.1	1.01	0.97
50.1	1.57	0.90
51.1	1.12	1.42
52.1	0.29	0.58
53.1	0.27	0.72
54.1	0.52	0.94
55.1	0.85	0.96
56.1	0.90	1.43
57.1	0.73	1.69
58.1	-0.03	1.60
59.1	-0.41	1.72
60.1	-0.54	1.78
61.1	-0.50	1.86
62.1	-0.53	1.62
63.1	-0.79	0.92
64.1	-1.26	0.88
65.1	-0.74	0.78
66.1	-0.94	0.56
67.1	-0.19	1.55
68.1	-0.83	0.66
69.1	-0.69	0.99
70.1	-0.92	0.79
71.1	-0.91	0.64
72.1	-0.85	0.59
73.1	-0.66	0.78
74.1	0.00	1.43
75.1	0.05	1.55
76.1	-0.18	1.49
77.1	-0.38	1.58
78.1	0.18	1.19
79.1	1.15	1.44
80.1	0.35	1.06
81.1	0.08	1.13
82.1	-0.11	1.12
83.1	-0.14	0.98
84.1	-0.27	0.89
85.1	-0.51	0.75
86.1	-0.52	0.45
87.1	-0.43	0.54
88.1	-0.25	0.94
89.1	0.07	1.26
90.1	0.29	1.31
91.1	0.37	1.26
92.1	0.60	1.31
93.1	0.79	1.32
94.1	0.94	1.11
95.1	1.06	0.86
96.1	1.15	0.91
97.1	1.09	0.92
98.1	0.85	1.16
99.1	0.79	1.20
100.1	0.31	1.66
101.1	0.09	1.51
102.1	0.07	1.31
103.1	-0.21	1.46
104.1	-0.37	1.53
105.1	-0.32	1.46
106.1	-0.33	1.45
107.1	-0.58	0.98
108.1	-0.92	0.98
109.1	-0.76	0.97
110.1	-0.83	1.01
111.1	-0.85	1.07
112.1	-0.80	1.12
113.1	-0.52	1.05
114.1	-0.12	0.92
115.1	0.32	0.91
116.1	0.70	0.87
117.1	0.86	0.98
118.1	1.02	0.91
119.1	1.15	0.78
120.1	1.23	0.60
121.1	1.30	0.47
122.1	1.32	0.47
123.1	1.37	0.51
124.1	1.55	0.62
125.1	1.60	0.82
126.1	1.05	0.86
127.1	-0.16	1.35
128.1	-0.45	1.36
129.1	-0.61	1.17
130.1	-0.86	1.05
131.1	-0.90	1.04
132.1	-0.89	1.26
133.1	-0.49	2.06
134.1	-0.22	1.83
135.1	-0.60	0.52
136.1	-0.42
137.1	0.13
138.1	0.68
139.1	0.79
140.1	0.62
141.1	0.72
142.1	1.44
143.1	2.15
144.1	1.82
145.1	2.12
146.1	0.76
147.1	1.14
148.1	1.18
149.1	0.86
150.1	-0.03
151.1	-0.84
152.1	-1.44
153.1	-1.69
154.1	-1.72
155.1	-1.76
156.1	-1.87
157.1	-1.98
158.1	-2.04
159.1	-2.07
160.1	-1.90
161.1	-1.73
162.1	-1.56
163.1	-1.12
164.1	-0.07
165.1	-0.14
166.1	-1.88
167.1	1.92
168.1	1.37
169.1	-1.80
170.1	-1.05
171.1	-0.30
172.1	0.74
173.1	1.90
174.1	1.56