Basin-scale Arabian Sea denitrification reconstruction based on δ¹⁵N records including core SSD004 GC11
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2026
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| _version_ | 1867171379148750848 |
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| author | Singh, Dharmendra Pratap |
| author_facet | Singh, Dharmendra Pratap |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | This dataset provides nitrogen isotopic composition (δ¹⁵N) and total nitrogen (TN) measurements from marine sediment core SSD004 GC11 in the southern Arabian Sea covering the last ~167 ka. The records document variability in water-column denitrification, an important control on marine nitrogen cycling and atmospheric N₂O emissions. δ¹⁵N values indicate strong coupling between primary productivity and denitrification during warm intervals, with weaker coupling during cold periods despite continued productivity linked to winter monsoon mixing. The new δ¹⁵N record 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. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_993898 |
| institution | PANGAEA |
| language | en |
| publishDate | 2026 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Basin-scale Arabian Sea denitrification reconstruction based on δ¹⁵N records including core SSD004 GC11 Singh, Dharmendra Pratap Arabian Sea; d15N; Sedimentary geochemistry; Stack; TN This dataset provides nitrogen isotopic composition (δ¹⁵N) and total nitrogen (TN) measurements from marine sediment core SSD004 GC11 in the southern Arabian Sea covering the last ~167 ka. The records document variability in water-column denitrification, an important control on marine nitrogen cycling and atmospheric N₂O emissions. δ¹⁵N values indicate strong coupling between primary productivity and denitrification during warm intervals, with weaker coupling during cold periods despite continued productivity linked to winter monsoon mixing. The new δ¹⁵N record 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. |
| title | Basin-scale Arabian Sea denitrification reconstruction based on δ¹⁵N records including core SSD004 GC11 |
| topic | Arabian Sea; d15N; Sedimentary geochemistry; Stack; TN |
| url | https://doi.org/10.1594/PANGAEA.993898 |