https://doi.pangaea.de/10.1594/PANGAEA.993903Singh, Dharmendra PratapDharmendra PratapSingh0000-0001-5563-1633Indian Institute of Technology RoorkeePANGAEA2026Arabian Sead15NSedimentary geochemistryStackTNDEPTH, sediment/rockDepth, sediment/rock, top/minimumDepth, sediment/rock, bottom/maximumAGEδ15N, bulk sedimentNitrogen, totalTephra/volcanic ashGravity corerIsotope Ratio Mass Spectrometer (IRMS) Thermo Fisher Scientific, MAT 253 PlusSindhu SadhanaDatasethttps://doi.pangaea.de/10.1594/PANGAEA.99389810.1016/j.gloplacha.2026.1053732333 data pointstext/tab-separated-valuesCreative Commons Attribution 4.0 InternationalThis 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.78.93126.0Science and Engineering Research Boardhttps://doi.org/10.13039/501100001843SRG/2021/000620