PANGAEA_993906 Basin-scale Arabian Sea denitrification reconstruction based on δ¹⁵N records, Southern Arabian Sea Stack Singh, Dharmendra Pratap Basin-scale Arabian Sea denitrification reconstruction based on δ¹⁵N records, Southern Arabian Sea Stack 2026-04-29 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.993906 Investigator Dharmendra Pratap Singh dharmendra.singh@es.iitr.ac.in Earth Science AGE δ15N, bulk sediment δ15N, standard deviation geoscientificInformation Arabian Sea d15N GOA4 GOA6 Gravity corer Kasten corer KL-74, AS-12 NIOP_905 Sedimentary geochemistry Sediment corer SO42 SO42-74KL SS4018G SSD004_GC11 Stack TN Stacked calculated, 1 sigma Sonne Sindhu Sadhana 1986-05-24 1986-05-24 Complete 6.0 14.983 46.9323 78.9312 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 349 data points text/tab-separated-values 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 Isaji, Yuta; Kawahata, Hodaka; Ohkouchi, Naohiko; Ogawa, Nanako O; Murayama, Masafumi; Inoue, Kazuki; Tamaki, Kensaku (2015): Varying responses to I ndian monsoons during the past 220 kyr recorded in deep‐sea sediments in inner and outer regions of the G ulf of A den. Journal of Geophysical Research: Oceans, 120(11), 7253-7270, https://doi.org/10.1002/2015JC010982 Ivanochko, Tara S; Ganeshram, Raja S; Brummer, Geert-Jan A; Ganssen, Gerald M; Jung, S J A; Moreton, Stephen; Kroon, Dick (2005): Variations in tropical convection as an amplifier of global climate change at the millennial scale. Earth and Planetary Science Letters, 235(1-2), 302-314, https://doi.org/10.1016/j.epsl.2005.04.002 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 Tiwari, Manish; Ramesh, R; Bhushan, Ravi; Sheshshayee, Madavalm S; Somayajulu, Bammidipati L K; Jull, A J Timothy; Burr, George S (2010): Did the Indo‐Asian summer monsoon decrease during the Holocene following insolation? Journal of Quaternary Science, 25(7), 1179-1188, https://doi.org/10.1002/jqs.1398 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.993906"!

http://en.wikipedia.org/wiki/Kyr AGE https://doi.org/10.1002/2015JC010982 Varying responses to I ndian monsoons during the past 220 kyr recorded in deep‐sea sediments in inner and outer regions of the G ulf of A den https://doi.org/10.1002/jqs.1398 Did the Indo‐Asian summer monsoon decrease during the Holocene following insolation? https://doi.org/10.1016/j.epsl.2005.04.002 Variations in tropical convection as an amplifier of global climate change at the millennial scale 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/10.25921/W9CA-1Z10 NOAA/WDS Paleoclimatology - NICOPP Global Ocean Sediment Nitrogen Isotope Database https://en.wikipedia.org/wiki/RV_Sonne Sonne https://www.nio.res.in/research/research-vessels/rv-sindhu-sadhana Sindhu Sadhana PANGAEA_993898 DIF 9.4 2026-04-29 2026-04-29