Singh Dharmendra Pratap dharmendra.singh@es.iitr.ac.in 0000-0001-5563-1633 Indian Institute of Technology Roorkee IITR http://www.iitr.ac.in/ https://ror.org/00582g326 2026 Basin-scale Arabian Sea denitrification reconstruction based on δ¹⁵N records including core SSD004 GC11 dataset bundled publication https://doi.pangaea.de/10.1594/PANGAEA.993898 2026-04-29T10:54:43 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. Pawar Rahul Singh Dharmendra Pratap dharmendra.singh@es.iitr.ac.in 0000-0001-5563-1633 Saraswat Rajeev rsaraswat@nio.org 0000-0003-2110-2578 Maurya A S 2026 Orbital forcing regulated Arabian Sea denitrification during the late Pleistocene journal article Global and Planetary Change 259 https://doi.org/10.1016/j.gloplacha.2026.105373 105373 46.9323 78.9312 6.0 24.84283 67.24630060372657 14.213590207591304 1976-01-01T00:00:00 2007-10-02T21:32:00 Science and Engineering Research Board SERB https://doi.org/10.13039/501100001843 SRG/2021/000620 6 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ Depth, sediment/rock, top/minimum | Depth sed top | Depth, sediment/rock, bottom/maximum | Depth sed bot | δ15N, bulk sediment | δ15N bulk | Isotope Ratio Mass Spectrometer (IRMS) Thermo Fisher Scientific, MAT 253 Plus | wt. % | Nitrogen, total | TN | Tephra/volcanic ash | Tephra | Arabian Sea Stack | Stacked | δ15N, standard deviation | δ15N std dev | calculated, 1 sigma | Northern Arabian Sea Stack | Southern Arabian Sea Stack | Western Arabian Sea Stack | Eastern Arabian Sea Stack Arabian Sea d15N Sedimentary geochemistry Stack TN method13010 method19037 method620 param18375 param31361 param518755 param518756 param73 param75382 pi74609 author117229 author31198 author74609 author89420 award4959 funder21066 geocode1599 geocode1600 geocode1601 inst22743 journal6174 license21 ref139688 term51409 term51567 term52549 term68617 term69323