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Singh, Dharmendra Pratap (2026): Basin-scale Arabian Sea denitrification reconstruction based on δ¹⁵N records, Western Arabian Sea Stack [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.993907 (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:
Altabet, Mark A; Francois, Roger; Murray, David W; Prell, Warren L (1995): Climate-related variations in denitrification in the Arabian Sea from sediment 15N/14N ratios. Nature, 373(6514), 506-509, https://doi.org/10.1038/373506a0
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
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
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
Additional metadata:
Arabian Sea cores, references and chronology
Funding:
Science and Engineering Research Board (SERB), grant/award no. SRG/2021/000620
Coverage:
Median Latitude: 18.304995 * Median Longitude: 58.735577 * South-bound Latitude: 16.621800 * West-bound Longitude: 57.590000 * North-bound Latitude: 22.619170 * East-bound Longitude: 59.861660
Date/Time Start: 1986-05-26T00:00:00 * 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
M74/1b_960-1 (SL 167) * Latitude: 22.619170 * Longitude: 59.691500 * Date/Time: 2007-10-02T21:32:00 * Elevation: -774.0 m * Recovery: 7.40 m * Location: Oman Margin * Campaign: M74/1b * Basis: Meteor (1986) * Method/Device: Gravity corer (Kiel type) (SL)
RC27-14 * Latitude: 18.253000 * Longitude: 57.655000 * Date/Time: 1986-05-26T00:00:00 * Elevation: -4040.0 m * Recovery: 10.85 m * Location: Indian Ocean * Campaign: RC27 * Basis: Robert Conrad * Method/Device: Piston corer (PC)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 AGEAgeka BPSingh, Dharmendra PratapGeocode
2 δ15N, bulk sedimentδ15N bulk‰ airSingh, Dharmendra PratapStackedWestern Arabian 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:
347 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
1.11.53
2.11.330.21
3.11.080.34
4.11.360.54
5.11.120.51
6.10.780.49
7.10.590.58
8.10.520.68
9.10.730.86
10.10.950.98
11.10.390.72
12.10.030.48
13.10.050.41
14.10.330.72
15.1-0.850.38
16.1-1.090.08
17.1-0.850.17
18.1-0.850.29
19.1-0.650.39
20.1-0.470.40
21.1-0.740.34
22.1-0.560.34
23.1-0.410.37
24.1-1.030.38
25.1-1.010.27
26.1-0.900.47
27.1-0.750.64
28.1-1.230.51
29.1-0.810.53
30.1-0.331.03
31.1-0.750.39
32.1-0.230.43
33.1-0.230.78
34.1-0.760.52
35.10.120.89
36.1-0.430.58
37.10.121.22
38.1-0.071.00
39.1-0.190.57
40.10.311.18
41.10.310.53
42.10.720.67
43.10.091.01
44.11.140.79
45.11.060.97
46.1-0.120.60
47.10.280.88
48.10.411.09
49.10.681.04
50.11.241.12
51.11.580.99
52.11.070.40
53.10.600.84
54.1-0.141.06
55.10.510.37
56.10.650.54
57.10.230.49
58.10.120.59
59.1-0.610.79
60.1-1.210.46
61.1-1.460.29
62.1-1.650.31
63.1-1.490.52
64.1-1.320.39
65.1-1.370.27
66.1-1.410.17
67.1-1.430.12
68.1-1.130.24
69.1-0.720.39
70.1-0.310.55
71.10.100.70
72.10.220.59
73.10.230.36
74.10.190.21
75.1-0.010.11
76.1-0.200.23
77.1-0.350.42
78.1-0.500.62
79.1-0.370.34
80.1-0.240.10
81.1-0.280.07
82.1-0.410.04
83.1-0.550.14
84.1-0.670.24
85.1-0.630.45
86.1-0.480.75
87.1-0.250.90
88.1-0.011.06
89.10.261.24
90.10.441.24
91.10.621.08
92.10.761.00
93.10.700.69
94.10.640.52
95.10.620.48
96.10.480.38
97.10.410.32
98.10.330.28
99.10.280.30
100.10.220.35
101.10.250.31
102.10.280.28
103.10.310.28
104.10.340.30
105.10.290.30
106.10.240.40
107.10.190.54
108.10.230.61
109.10.320.58
110.10.400.51
111.10.490.46
112.10.600.45
113.10.730.51
114.10.860.63
115.10.990.77
116.11.110.93
117.11.150.94
118.11.010.74
119.10.890.52
120.10.770.34
121.10.660.27
122.10.570.35
123.10.680.36
124.10.430.99
125.1-0.030.84
126.1-0.010.68
127.1-0.020.71
128.1-0.270.62
129.1-0.260.35
130.1-0.110.42
131.10.240.74
132.10.460.89
133.10.080.48
134.10.150.61
135.10.440.63
136.10.520.67
137.10.340.57
138.10.540.82
139.10.460.32
140.1-0.060.61
141.1-0.190.69
142.1-0.290.94
143.1-0.291.25
144.1-0.361.47
145.1-0.061.55
146.1-0.500.91
147.1-0.491.00
148.1-0.461.09
149.1-0.660.80
150.1-0.720.72
151.1-0.750.48
152.1-0.750.27
153.1-0.540.24
154.1-0.470.11
155.1-0.380.37
156.1-0.520.30
157.1-0.400.14
158.10.020.98
159.1-0.090.82
160.10.081.03
161.10.191.16
162.1-0.270.39
163.1-0.350.11
164.10.010.46
165.10.330.55
166.10.530.27
167.10.850.14
168.10.550.50
169.10.360.16
170.1-0.140.25
171.1-0.260.12
172.1-0.120.24
173.10.030.37
174.10.170.49