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, Northern Arabian Sea Stack dataset https://doi.pangaea.de/10.1594/PANGAEA.993905 2026-04-29T10:55:05 https://doi.pangaea.de/10.1594/PANGAEA.993898 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. Jaeschke Andrea andrea.jaeschke@uni-koeln.de 0000-0003-2518-2739 Ziegler Martin M.Ziegler@uu.nl 0000-0003-3198-6434 Hopmans Ellen C ellen.hopmans@nioz.nl 0000-0002-8209-1334 Reichart Gert-Jan Gert-Jan.Reichart@nioz.nl 0000-0002-7256-2243 Lourens Lucas Joost llourens@geo.uu.nl 0000-0002-3815-7770 Schouten Stefan Stefan.Schouten@nioz.nl Sinninghe Damsté Jaap S jaap.damste@nioz.nl 0000-0002-8683-1854 2009 Molecular fossil evidence for anaerobic ammonium oxidation in the Arabian Sea over the last glacial cycle journal article Paleoceanography 24(2) https://doi.org/10.1029/2008PA001712 PA2202 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 Pichevin Laetitia laetitia.pichevin@ed.ac.uk 0000-0003-2685-6926 Bard Edouard bard@cerege.fr 0000-0002-7237-8622 Martinez Philippe 0000-0002-9825-2032 Billy Isabelle 2007 Evidence of ventilation changes in the Arabian Sea during the late Quaternary: Implication for denitrification and nitrous oxide emission journal article Global Biogeochemical Cycles 21 https://doi.org/10.1029/2006GB002852 GB4008 Reichart Gert-Jan Gert-Jan.Reichart@nioz.nl 0000-0002-7256-2243 Lourens Lucas Joost llourens@geo.uu.nl 0000-0002-3815-7770 Zachariasse Willem-Jan 1998 Temporal variability in the northern Arabian Sea oxygen minimum zone (OMZ) during the last 225,000 years journal article Paleoceanography 13(6) https://doi.org/10.1029/98PA02203 607-621 Suthhof Andreas Ittekkot Venugopalan ittekkot@dkrz.de 0000-0003-2667-5068 Gaye-Haake Birgit haake@geowiss.uni-hamburg.de 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 journal article Global Biogeochemical Cycles 15(3) https://doi.org/10.1029/2000GB001337 637-649 Tesdal J-E Galbraith Eric Douglas eric.galbraith@mcgill.ca 0000-0003-4476-4232 Kienast Markus markus.kienast@dal.ca 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 andrea.jaeschke@uni-koeln.de 0000-0003-2518-2739 Ziegler Martin M.Ziegler@uu.nl 0000-0003-3198-6434 Hopmans Ellen C ellen.hopmans@nioz.nl 0000-0002-8209-1334 Reichart Gert-Jan Gert-Jan.Reichart@nioz.nl 0000-0002-7256-2243 Lourens Lucas Joost llourens@geo.uu.nl 0000-0002-3815-7770 Schouten Stefan Stefan.Schouten@nioz.nl Sinninghe Damsté Jaap S jaap.damste@nioz.nl 0000-0002-8683-1854 2009 Figure 4. Geochemistry on sediment core MD04-2879 dataset https://doi.org/10.1594/PANGAEA.742495 Pichevin Laetitia laetitia.pichevin@ed.ac.uk 0000-0003-2685-6926 Bard Edouard bard@cerege.fr 0000-0002-7237-8622 Martinez Philippe 0000-0002-9825-2032 Billy Isabelle 2007 Biogeochemical investigations on sediment core MD04-2876 dataset publication series https://doi.org/10.1594/PANGAEA.727157 Reichart Gert-Jan Gert-Jan.Reichart@nioz.nl 0000-0002-7256-2243 Lourens Lucas Joost llourens@geo.uu.nl 0000-0002-3815-7770 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 https://doi.org/10.1594/PANGAEA.857398 Arabian Sea cores, references and chronology https://download.pangaea.de/reference/139702/attachments/References_chronology.xlsx 63.585 66.483 19.999 24.84283 64.95947666666666 22.71657833333333 1992-10-06T00:00:00 2004-09-21T00:00:00 -3167.0 -775.0 vertical profile Science and Engineering Research Board SERB https://doi.org/10.13039/501100001843 SRG/2021/000620 MD04-2876 24.84283 64.00816 Pakistan continental margin -828.0 MD143 MD143 CHAMAK CHAMAK http://www.ifremer.fr/sismer/UK/catal/campagne/campagnea.htql?crno=4200250 2004-09-22T00:00:00 2004-09-22 2004-10-16T00:00:00 2004-10-16 Marion Dufresne (1995) https://en.wikipedia.org/wiki/Marion_Dufresne_(1994) FNIN 9050814 Lallemant, S Lallemant, S Marion Dufresne (1995) https://en.wikipedia.org/wiki/Marion_Dufresne_(1994) FNIN 9050814 Calypso Corer CALYPSO 33 m located within the present day OMZ (oxygen minimum zone) MD04-2879CQ 22.5483 64.0467 Gulf of Oman -920.0 2004-09-21T00:00:00 MD143 MD143 CHAMAK CHAMAK http://www.ifremer.fr/sismer/UK/catal/campagne/campagnea.htql?crno=4200250 2004-09-22T00:00:00 2004-09-22 2004-10-16T00:00:00 2004-10-16 Marion Dufresne (1995) https://en.wikipedia.org/wiki/Marion_Dufresne_(1994) FNIN 9050814 Lallemant, S Lallemant, S Marion Dufresne (1995) https://en.wikipedia.org/wiki/Marion_Dufresne_(1994) FNIN 9050814 Calypso square corer CASQ ME33-NAST 19.999 65.684 -3167.0 Sediment corer SEDCO NIOP-D2_455-1 23.55667 65.95 Arabian Sea -1002.0 1992-10-06T00:00:00 NIOP-D2 NIOP-D2 1992-10-04T00:00:00 1992-10-04 1992-10-25T00:00:00 1992-10-25 Tyro van der Linden, W J M van der Linden, W J M Netherlands Indian Ocean Programme Tyro Piston corer PC NIOP-D2_464-1 22.25667 63.585 Arabian Sea -1470.0 1992-10-15T00:00:00 NIOP-D2 NIOP-D2 1992-10-04T00:00:00 1992-10-04 1992-10-25T00:00:00 1992-10-25 Tyro van der Linden, W J M van der Linden, W J M Netherlands Indian Ocean Programme Tyro Piston corer PC SO90_111KL 23.096 66.483 Arabian Sea -775.0 1993-09-19T00:00:00 SO90 SO90 PAKOMIN PAKOMIN Karachi, Pakistan 1993-08-30T00:00:00 1993-08-30 Karachi, Pakistan 1993-10-05T00:00:00 1993-10-05 Sonne https://en.wikipedia.org/wiki/RV_Sonne DFCG 6909777 von Rad, Ulrich von Rad, Ulrich doi:10.2312/cr_so90 19940030 PAKOMIN Sonne https://en.wikipedia.org/wiki/RV_Sonne DFCG 6909777 Piston corer (BGR type) KL 14.45 m GPS, 311 CC-BY-4.0 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/ AGE Age ka BP http://en.wikipedia.org/wiki/Kyr age http://purl.obolibrary.org/obo/PATO_0000011 Time T http://dbpedia.org/resource/Time Singh Dharmendra Pratap dharmendra.singh@es.iitr.ac.in 0000-0001-5563-1633 Age [ka BP] δ15N, bulk sediment δ15N bulk ‰ air δ15N http://en.wikipedia.org/wiki/List_of_elements_by_stability_of_isotopes Stacked Singh Dharmendra Pratap dharmendra.singh@es.iitr.ac.in 0000-0001-5563-1633 Northern Arabian Sea Stack δ15N bulk [‰ air] δ15N, standard deviation δ15N std dev ± δ15N http://en.wikipedia.org/wiki/List_of_elements_by_stability_of_isotopes standard deviation std dev https://en.wikipedia.org/wiki/Standard_deviation calculated, 1 sigma Singh Dharmendra Pratap dharmendra.singh@es.iitr.ac.in 0000-0001-5563-1633 δ15N std dev [±] CurationLevelC Enhanced curation https://wiki.pangaea.de/wiki/Curation_levels Arabian Sea d15N Sedimentary geochemistry Stack TN author10930 author117229 author117239 author21697 author23772 author24759 author25039 author25710 author26503 author28188 author28322 author28372 author29517 author29770 author31198 author32997 author34468 author34580 author40719 author543 author74609 author89420 award4959 basis4 basis438 basis94 campaign10066 campaign24764 campaign3383349 campaign3385072 campaign3392279 campaign34355 curlevel30 event2580077 event2591610 event2794332 event2794334 event3397903 event48667 funder21066 geocode1599 geocode1600 geocode1601 geocode2205 geocode8128 inst22743 journal12511 journal6174 journal6175 license21 method10655 method10861 method10865 method11440 method12022 method13010 method620 param31361 param75382 pi74609 ref139688 ref139694 ref139699 ref139702 ref30459 ref32231 ref78962 refds727157 refds742495 refds857398 term1073092 term1073135 term20612 term22513 term28157 term37764 term43975 term51409 term51567 term52549 term68617 term69323 term77619 topotype3