PANGAEA_993905 Basin-scale Arabian Sea denitrification reconstruction based on δ¹⁵N records, Northern Arabian Sea Stack Singh, Dharmendra Pratap Basin-scale Arabian Sea denitrification reconstruction based on δ¹⁵N records, Northern Arabian Sea Stack 2026-04-29 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.993905 Investigator Dharmendra Pratap Singh dharmendra.singh@es.iitr.ac.in Earth Science AGE δ15N, bulk sediment δ15N, standard deviation geoscientificInformation Arabian Sea Calypso Corer Calypso square corer d15N MD04-2876 MD04-2879CQ MD143 ME33-NAST NIOP-D2 NIOP-D2_455-1 NIOP-D2_464-1 Piston corer Piston corer (BGR type) Sedimentary geochemistry Sediment corer SO90 SO90_111KL Stack TN Stacked calculated, 1 sigma Marion Dufresne (1995) Tyro Sonne 1992-10-06 2004-09-21 Complete 19.999 24.84283 63.585 66.483 unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 311 data points text/tab-separated-values Jaeschke, Andrea; Ziegler, Martin; Hopmans, Ellen C; Reichart, Gert-Jan; Lourens, Lucas Joost; Schouten, Stefan; Sinninghe Damsté, Jaap S (2009): Molecular fossil evidence for anaerobic ammonium oxidation in the Arabian Sea over the last glacial cycle. Paleoceanography, 24(2), PA2202, https://doi.org/10.1029/2008PA001712 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 Pichevin, Laetitia; Bard, Edouard; Martinez, Philippe; Billy, Isabelle (2007): Evidence of ventilation changes in the Arabian Sea during the late Quaternary: Implication for denitrification and nitrous oxide emission. Global Biogeochemical Cycles, 21, GB4008, https://doi.org/10.1029/2006GB002852 Reichart, Gert-Jan; Lourens, Lucas Joost; Zachariasse, Willem-Jan (1998): Temporal variability in the northern Arabian Sea oxygen minimum zone (OMZ) during the last 225,000 years. Paleoceanography, 13(6), 607-621, https://doi.org/10.1029/98PA02203 Suthhof, Andreas; Ittekkot, Venugopalan; Gaye-Haake, Birgit (2001): Millennial‐scale oscillation of denitrification intensity in the Arabian Sea during the Late Quaternary and its potential influence on atmospheric N 2 O and global climate. Global Biogeochemical Cycles, 15(3), 637-649, https://doi.org/10.1029/2000GB001337 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 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 Pichevin, Laetitia; Bard, Edouard; Martinez, Philippe; Billy, Isabelle (2007): Biogeochemical investigations on sediment core MD04-2876 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.727157 Reichart, Gert-Jan; Lourens, Lucas Joost; Zachariasse, Willem-Jan (1998): Organic carbon content, stable isotopes and planktonic foraminifera in sediments of tghe norther Arabian Sea oxygen minimum zone [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.857398 Arabian Sea cores, references and chronology (URI: https://download.pangaea.de/reference/139702/attachments/References_chronology.xlsx)

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. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.993905"!

http://en.wikipedia.org/wiki/Kyr AGE http://www.ifremer.fr/sismer/UK/catal/campagne/campagnea.htql?crno=4200250 MD143 https://doi.org/10.1016/j.gloplacha.2026.105373 Orbital forcing regulated Arabian Sea denitrification during the late Pleistocene https://doi.org/10.1029/2000GB001337 Millennial‐scale oscillation of denitrification intensity in the Arabian Sea during the Late Quaternary and its potential influence on atmospheric N 2 O and global climate https://doi.org/10.1029/2006GB002852 Evidence of ventilation changes in the Arabian Sea during the late Quaternary: Implication for denitrification and nitrous oxide emission https://doi.org/10.1029/2008PA001712 Molecular fossil evidence for anaerobic ammonium oxidation in the Arabian Sea over the last glacial cycle https://doi.org/10.1029/98PA02203 Temporal variability in the northern Arabian Sea oxygen minimum zone (OMZ) during the last 225,000 years https://doi.org/10.25921/W9CA-1Z10 NOAA/WDS Paleoclimatology - NICOPP Global Ocean Sediment Nitrogen Isotope Database https://doi.pangaea.de/10.1594/PANGAEA.727157 Biogeochemical investigations on sediment core MD04-2876 https://doi.pangaea.de/10.1594/PANGAEA.742495 Figure 4. Geochemistry on sediment core MD04-2879 https://doi.pangaea.de/10.1594/PANGAEA.857398 Organic carbon content, stable isotopes and planktonic foraminifera in sediments of tghe norther Arabian Sea oxygen minimum zone https://en.wikipedia.org/wiki/Marion_Dufresne_(1994) Marion Dufresne (1995) https://en.wikipedia.org/wiki/RV_Sonne Sonne PANGAEA_993898 DIF 9.4 2026-04-29 2026-04-29