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Singh, Dharmendra Pratap (2026): Basin-scale Arabian Sea denitrification reconstruction based on δ¹⁵N records, Arabian Sea Stack [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.993904 (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)

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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:
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:
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Altabet, Mark A; Higginson, Matthew J; Murray, David W (2002): NOAA/WDS Paleoclimatology - Arabian Sea Denitrification Data [dataset]. NOAA National Centers for Environmental Information, https://doi.org/10.25921/K2ME-E263
Altabet, Mark A; Higginson, Matthew J; Murray, David W (2002): The effect of millennial-scale changes in Arabian Sea denitrification on atmospheric CO2. Nature, 415(6868), 159-162, https://doi.org/10.1038/415159a
Altabet, Mark A; Murray, David W; Prell, Warren L (1999): Climatically linked oscillations in Arabian Sea denitrification over the past 1 m.y.: Implications for the marine N cycle. Paleoceanography, 14(6), 732-743, https://doi.org/10.1029/1999PA900035
Altabet, Mark A; Murray, David W; Prell, Warren L (1999): Nitrogen content and isotope ratios of ODP Hole 117-722B [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.856637
Altabet, Mark A; Murray, David W; Prell, Warren L (1999): Nitrogen content and isotope ratios of sediment core RC27-61 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.856638
Banakar, Virupaxa K; Oba, Tadamichi; Chodankar, A R; Kuramoto, Takayuki; Yamamoto, Masanobu; Minagawa, Masao (2005): Monsoon related changes in sea surface productivity and water column denitrification in the Eastern Arabian Sea during the last glacial cycle. Marine Geology, 219(2-3), 99-108, https://doi.org/10.1016/j.margeo.2005.05.004
Burdanowitz, Nicole; Schmiedl, Gerhard; Gaye, Birgit; Munz, Philipp; Schulz, Hartmut (2024): Nitrogen isotope record and TOC accumulation rates of sediment core GeoTü SL167 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.964228
Burdanowitz, Nicole; Schmiedl, Gerhard; Gaye, Birgit; Munz, Philipp M; Schulz, Hartmut (2024): Distinct oxygenation modes of the Gulf of Oman over the past 43 000 years – a multi-proxy approach. Biogeosciences, 21(6), 1477-1499, https://doi.org/10.5194/bg-21-1477-2024
Ganeshram, Raja S; Pedersen, Thomas F; Calvert, Stephen E; McNeill, Gavin W; Fontugne, Michel R (2000): Glacial‐interglacial variability in denitrification in the World's Oceans: Causes and consequences. Paleoceanography, 15(4), 361-376, https://doi.org/10.1029/1999PA000422
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
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
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Möbius, Jürgen; Gaye, Birgit; Lahajnar, Niko; Bahlmann, Enno; Emeis, Kay-Christian (2011): Influence of diagenesis on sedimentary d15N in the Arabian Sea over the last 130 kyr. Marine Geology, 284(1-4), 127-138, https://doi.org/10.1016/j.margeo.2011.03.013
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Funding:
Science and Engineering Research Board (SERB), grant/award no. SRG/2021/000620
Coverage:
Median Latitude: 17.148316 * Median Longitude: 62.631041 * South-bound Latitude: 6.000000 * West-bound Longitude: 46.932300 * North-bound Latitude: 24.842830 * East-bound Longitude: 78.931200
Date/Time Start: 1976-01-01T00:00:00 * Date/Time End: 2007-10-02T21:32:00
Minimum Elevation: -4040.0 m * Maximum Elevation: -455.0 m
Event(s):
117-722 * Latitude: 16.621800 * Longitude: 59.795300 * Date/Time Start: 1987-09-07T00:00:00 * Date/Time End: 1987-09-13T00:00:00 * Elevation: -2033.5 m * Penetration: 845.6 m * Recovery: 611.8 m * Location: Arabian Sea * Campaign: Leg117 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 88 cores; 845.1 m cored; 0 m drilled; 72.4% recovery
355-U1456 * Latitude: 16.621333 * Longitude: 68.838833 * Elevation: -3640.0 m * Campaign: Exp355 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE)
GOA4 * Latitude: 12.821500 * Longitude: 46.932300 * Elevation: -1474.0 m * Method/Device: Sediment corer (SEDCO)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 AGEAgeka BPSingh, Dharmendra PratapGeocode
2 δ15N, bulk sedimentδ15N bulk‰ airSingh, Dharmendra PratapStackedArabian Sea Stack
3 δ15N, standard deviationδ15N std dev±Singh, Dharmendra Pratapcalculated, 1 sigma
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
350 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 [±]
0.11.510.71
1.11.070.77
2.10.940.72
3.10.960.55
4.10.800.73
5.10.790.52
6.10.660.56
7.10.580.49
8.10.420.55
9.10.520.71
10.10.740.90
11.10.490.95
12.10.110.78
13.10.270.63
14.10.190.88
15.1-0.400.78
16.1-0.610.86
17.1-0.660.71
18.1-0.610.49
19.1-0.460.44
20.1-0.410.43
21.1-0.450.42
22.1-0.450.42
23.1-0.460.61
24.1-0.690.55
25.1-0.670.51
26.1-0.600.55
27.1-0.440.80
28.1-0.600.95
29.1-0.520.75
30.1-0.390.81
31.1-0.430.62
32.1-0.060.53
33.1-0.080.61
34.1-0.230.76
35.10.330.70
36.10.000.61
37.10.301.00
38.10.300.95
39.1-0.040.85
40.10.181.04
41.10.300.85
42.10.520.78
43.10.090.76
44.10.620.78
45.10.621.04
46.10.290.84
47.10.630.88
48.10.820.95
49.10.790.89
50.11.040.97
51.10.931.09
52.10.470.74
53.10.300.72
54.10.130.84
55.10.390.78
56.10.371.03
57.1-0.011.09
58.1-0.431.11
59.1-0.661.01
60.1-0.901.01
61.1-0.981.06
62.1-1.031.00
63.1-1.050.75
64.1-1.170.59
65.1-1.050.57
66.1-1.020.39
67.1-0.740.91
68.1-0.740.62
69.1-0.750.59
70.1-0.530.71
71.1-0.510.72
72.1-0.410.64
73.1-0.170.73
74.10.210.90
75.10.120.85
76.10.020.77
77.10.020.91
78.10.140.80
79.10.411.00
80.10.150.68
81.10.040.72
82.1-0.120.71
83.1-0.170.68
84.1-0.380.58
85.1-0.460.54
86.1-0.390.62
87.1-0.230.72
88.1-0.040.86
89.10.130.99
90.10.261.01
91.10.381.02
92.10.531.00
93.10.570.89
94.10.510.83
95.10.560.73
96.10.580.73
97.10.430.76
98.10.280.85
99.10.190.83
100.10.040.99
101.1-0.090.93
102.1-0.100.84
103.1-0.110.89
104.1-0.061.00
105.1-0.051.01
106.1-0.031.01
107.1-0.130.83
108.1-0.300.90
109.1-0.210.80
110.1-0.180.89
111.1-0.050.96
112.10.051.03
113.10.240.97
114.10.490.86
115.10.610.79
116.10.750.76
117.10.810.74
118.10.690.68
119.10.650.64
120.10.560.72
121.10.510.74
122.10.450.78
123.10.430.87
124.10.351.08
125.10.251.14
126.10.090.91
127.1-0.210.78
128.1-0.460.91
129.1-0.420.90
130.1-0.350.84
131.1-0.220.92
132.1-0.161.03
133.10.020.93
134.10.120.78
135.10.050.57
136.10.170.57
137.10.170.55
138.10.250.74
139.10.330.54
140.10.090.57
141.10.060.62
142.10.160.89
143.10.251.10
144.10.201.18
145.10.241.16
146.1-0.250.71
147.1-0.190.92
148.1-0.280.97
149.1-0.380.86
150.1-0.490.73
151.1-0.510.82
152.1-0.760.63
153.1-0.750.69
154.1-0.680.72
155.1-0.730.69
156.1-0.720.71
157.1-0.660.81
158.1-0.520.98
159.1-0.410.95
160.1-0.291.00
161.1-0.230.97
162.1-0.330.81
163.1-0.400.55
164.10.090.72
165.10.160.64
166.10.071.11
167.10.620.85
168.10.590.69
169.1-0.131.01
170.1-0.180.60
171.1-0.080.32
172.10.170.38
173.10.470.83
174.10.450.67