Primary production on the Western Indus continental shelf has been linked to the large quantities of nutrients delivered to the shelf by the Indus River. Multiple geochemical tracers and biomarker records, including stable isotopes (δ13C and δ15N), total organic carbon (TOC), total nitrogen (TN), molar carbon/nitrogen (C/N) ratio, the branched and isoprenoid tetraether (BIT) index, and glycerol dialkyl glycerol tetraether (GDGT), have been analyzed from the Indus-23AP sediment core recovered from the northern Arabian Sea. Our records show evidence of a mixture of marine and terrestrially derived organic matter (OM) during the last 14,000 years, as indicated by the C/N ratio, δ13C, δ15N, and the BIT index. The three sterol biomarkers (brassicasterol, dinosterol, and cholesterol) show concurrent enrichments during the last 3 millennia reflecting increased phytoplankton abundance because of increased Indus river discharge of nutrients during the summer monsoon. GDGT crenarchaeol enrichment is related to the BIT index. The TEX86-derived sea surface temperature (SST) record is shifted toward the summer season because Crenarchaeota are more abundant and active during periods of high primary production. SSTs indicate a long-term warming trend during the Holocene related to increasing winter insolation in the low latitudes northern Hemisphere.
AltabetMAMurrayDWPrellWL (1999) Climatically linked oscillations in Arabian Sea denitrification over the past 1 my: Implications for the marine N cycle. Paleoceanography14: 732–743.
2.
BangeHWRixenTJohansenAMet al. (2000) A revised nitrogen budget for the Arabian Sea. Global Biogeochemical Cycles41: 1283–1297.
3.
BöllALückgeAMunzPet al. (2014) Late-Holocene primary productivity and sea surface temperature variations in the northeastern Arabian Sea: Implications for winter monsoon variability. Paleoceanography29: 778–794.
4.
BöllASchulzHMunzPet al. (2015) Contrasting sea surface temperature of summer and winter monsoon variability in the northern Arabian Sea over the last 25ka. Palaeogeography, Palaeoclimatology, Palaeoecology426: 10–21.
5.
BrandTDGriffithsC (2009) Seasonality in the hydrography and biogeochemistry across the Pakistan margin of the NE Arabian Sea. Deep Sea Research Part II: Topical Studies in Oceanography56: 283–295.
6.
BrockJCMcClainCRAndersonDMet al. (1992) Southwest monsoon circulation and environments of recent planktonic foraminifera in the Northwestern Arabian Sea. Paleoceanography7: 799–813.
7.
CanfieldDE (1994) Factors influencing organic carbon preservation in marine sediments. Chemical Geology114: 315–329.
8.
CerlingTEHarrisJMMacFaddenBJet al. (1997) Global vegetation change through the Miocene/Pliocene boundary. Nature389: 153–158.
9.
CliftPDGiosanLHenstockTJet al. (2014) Sediment storage and reworking on the shelf and in the Canyon of the Indus River Fan System since the last glacial maximum. Basin Research26: 183–202.
10.
CliftPDLeeJIHildebrandPet al. (2002) Nd and Pb isotope variability in the Indus River System: Implications for sediment provenance and crustal heterogeneity in the Western Himalaya. Earth and Planetary Science Letters200: 91–106.
11.
CliftPDShimizuNLayneGet al. (2001) Development of the Indus Fan and its significance for the erosional history of the Western Himalaya and Karakoram. Geological Society of American Bulletin113: 1039–1051.
12.
CodispotiLAPackardTT (1980) Denitrification rates in the eastern tropical South Pacific. Journal Marine Research38: 453–477.
13.
CodispotiLARichardsFA (1976) An analysis of the horizontal regime of denitrification in the eastern tropical North Pacific. Limnology and Oceanography21: 379–388.
14.
ConleyDJPaerlHWHowarthRWet al. (2009) Controlling eutrophication: Nitrogen and phosphorus. Science323: 1014–1015.
15.
CowieGLCalvertSEPedersenTFet al. (1999) Organic content and preservational controls in surficial shelf and slope sediments from the Arabian Sea (Pakistan margin). Marine Geology161: 23–38.
16.
DamstéJSSRijpstraWICReichartG-J (2002a) The influence of oxic degradation on the sedimentary biomarker record II. Evidence from Arabian Sea sediments. Geochimica et Cosmochimica Acta66: 2737–2754.
17.
DamstéJSSSchoutenSHopmansECet al. (2002b) Crenarchaeol: The characteristic core glycerol dibiphytanyl glycerol tetraether membrane lipid of cosmopolitan pelagic Crenarchaeota. Journal of Lipid Research43: 1641–1651.
18.
DeinesP (1980) The isotopic composition of reduced organic carbon. In: FritzPFontesJ-Ch (eds) Handbook of Environmental Isotope Geochemistry, vol. 1, Amsterdam; Oxford; New York: Springer, pp. 329–406.
19.
DemaisonGJMooreGT (1980) Anoxic environments and oil source bed genesis. Organic Geochemistry2: 9–31.
20.
DeplazesGLückgeAStuutJ-BWet al. (2014) Weakening and strengthening of the Indian monsoon during Heinrich events and Dansgaard–Oeschger oscillations. Paleoceanography29: 99–114.
21.
DruonJ-NSchrimpfWDobricicSet al. (2004) Comparative assessment of large-scale marine eutrophication: North Sea area and Adriatic Sea as case studies. Marine Ecology Progress Series272: 1–23.
22.
FanningLPKhanMWKidwaiSet al. (2011) Surveys of the offshore fisheries resources of Pakistan-2010. FAO Fisheries and Aquaculture Circular No. 1065. Karachi: FAO.
23.
FleitmannDBurnsSJMudelseeMet al. (2003) Holocene forcing of the Indian monsoon recorded in a stalagmite from southern Oman. Science300: 1737–1739.
24.
FrancisCARobertsKJBemanJMet al. (2005) Ubiquity and diversity of ammonia-oxidizing archaea in water columns and sediments of the ocean. Proceedings of the National Academy of Sciences of the United States of America102: 14683–14688.
25.
GayeBBöllASegschneiderJet al. (2018) Glacial–interglacial changes and Holocene variations in Arabian Sea denitrification. Biogeosciences15: 507–527.
26.
GiosanLConstantinescuSCliftPDet al. (2006) Recent morphodynamics of the Indus delta shore and shelf. Continental Shelf Research26: 1668–1684.
27.
GuptaAKAndersonDMOverpeckJT (2003) Abrupt changes in the Asian southwest monsoon during the Holocene and their links to the North Atlantic Ocean. Nature421: 354–357.
28.
HellyJJLevinLA (2004) Global distribution of naturally occurring marine hypoxia on continental margins. Deep Sea Research Part I: Oceanographic Research Papers51: 1159–1168.
29.
HopmansECWeijersJWHSchefußEet al. (2004) A novel proxy for terrestrial organic matter in sediments based on branched and isoprenoid tetraether lipids. Earth and Planetary Science Letters224: 107–116.
30.
HughenKABaillieMGLBardEet al. (2004) Marine04 Marine radiocarbon age calibration, 0–26 cal kyr BP. Radiocarbon46: 1059–1086.
31.
HuguetCHopmansECFebo-AyalaWet al. (2006a) An improved method to determine the absolute abundance of Glycerol Dibiphytanyl Glycerol Tetraether lipids. Organic Geochemistry37: 1036–1041.
32.
HuguetCKimJHDamstéJSSet al. (2006b) Reconstruction of sea surface temperature variations in the Arabian Sea over the last 23 kyr using organic proxies (TEX86 and U37K′). Paleoceanography21: PA3003.
33.
JalaliBSicreMABassettiMAet al. (2016) Holocene climate variability in the North-Western Mediterranean Sea (Gulf of Lions). Climate of the Past12: 91–101.
34.
JeffreysRMFisherEHGoodayAJet al. (2015) The trophic and metabolic pathways of foraminifera in the Arabian Sea: Evidence from cellular stable isotopes. Biogeosciences12: 1781–1797.
35.
JörnWDanielAPRobertMBet al. (2018) Community composition and seasonal changes of archaea in coarse and fine air particulate matter. Biogeosciences15: 4205–4214.
36.
KimJ-HSchoutenSBuscailRet al. (2006) Origin and distribution of terrestrial organic matter in the NW Mediterranean (Gulf of Lions): Exploring the newly developed BIT index. Geochemistry, Geophysics, Geosystems7: Q11017.
37.
KremerASteinRFahlKet al. (2018) Changes in sea ice cover and ice sheet extent at the Yermak Plateau during the last 160 ka – Reconstructions from biomarker records. Quaternary Science Reviews182: 93–108.
38.
LimmerDRBöningPGiosanLet al. (2012) Geochemical record of Holocene to recent sedimentation on the Western Indus continental shelf, Arabian Sea. Geochemistry, Geophysics, Geosystems13: Q01008.
39.
LiuZZhuJRosenthalYet al. (2014) The Holocene temperature conundrum. Proceedings of the National Academy of Sciences of the United States of America111: E3501–E3505.
40.
LocarniniRAMishonovAVAntonovJIet al. (2013) World Ocean Atlas 2013, volume 1: Temperature. In: LevitusS (ed.) and MishonovA (technical ed.) NOAA Atlas NESDIS 73. Silver Spring, MD: National Oceanographic Data Center, p. 40. Available at: http://www.nodc.noaa.gov/OC5/indprod.html
41.
LückgeADeplazesGSchulzHet al. (2012) Impact of Indus River discharge on productivity and preservation of organic carbon in the Arabian Sea over the twentieth century. Geology40: 399–402.
42.
MadhupratapMKumarSPBhattathiriPMAet al. (1996) Mechanism of the biological response to winter cooling in the northeastern Arabian Sea. Nature384: 549–552.
43.
MarcottSAShakunJDClarkPUet al. (2013) A reconstruction of regional and global temperature for the past 11,300 years. Science339: 1198–1201.
44.
MecklerANHaugGHSigmanDMet al. (2007) Detailed sedimentary N isotope records from Cariaco Basin for Terminations I and V: Local and global implications. Global Biogeochemical Cycles21: GB4019.
45.
MeyersPA (1994) Preservation of elemental and isotopic source identification of sedimentary organic matter. Chemical Geology114: 289–302.
46.
MeyersPA (1997) Organic geochemical proxies of paleoceanographic, paleolimnologic, and paleoclimatic processes. Organic Geochemistry27: 213–250.
47.
MeyersPA (2003) Applications of organic geochemistry to paleolimnological reconstructions: A summary of examples from the Laurentian Great Lakes. Organic Geochemistry34: 261–289.
48.
MillimanJDQuraisheeGSBegMAA (1984) Sediment discharge from the Indus River to the ocean: Past, present and future. In: HaqBUMillimanJD (eds) Marine Geology and Oceanography of Arabian Sea and Coastal Pakistan. New York: Van Nostrand Reinhold Co., pp. 65–70.
49.
MöbiusJGayeBLahajnarNet al. (2011) Influence of diagenesis on sedimentary δ15N in the Arabian Sea over the last 130kyr. Marine Geology 2011: 284: 127–138.
50.
MorrisonJMCodispotiLASmithSLet al. (1999) The oxygen minimum zone in the Arabian Sea during 1995. Deep Sea Research Part II: Topical Studies in Oceanography46: 1903–1931.
51.
MunzPMSteinkeSBöllAet al. (2017) Decadal resolution record of Oman upwelling indicates solar forcing of the Indian summer monsoon (9–6 ka). Climate of the Past13: 491–509.
52.
NaqviSWANoronhaRJReddyCVG (1982) Denitrification in the Arabian Sea. Deep Sea Research Part A: Oceanographic Research Papers29: 459–469.
53.
NaqviSWASarmaVVSSJayakumarDA (2002) Carbon cycling in the northern Arabian Sea during the northeast monsoon: Significance of salps. Marine Ecology Progress Series226: 35–44.
54.
NaqviSWAYoshinariTJayakumarDAet al. (1998) Budgetary and biogeochemical implications of N2O isotope signatures in the Arabian Sea. Nature394: 462–464.
55.
OlsonDBHitchcockGLFineRAet al. (1993) Maintenance of the low-oxygen layer in the central Arabian Sea. Deep Sea Research Part II: Topical Studies in Oceanography40: 673–685.
56.
PancostRDDamstéJSS (2003) Carbon isotopic compositions of prokaryotic lipids as tracers of carbon cycling in diverse settings. Chemical Geology195: 29–58.
57.
PancostRDHopmansECSinninghe DamstéJSet al. (2001a) Archaeal lipids in Mediterranean cold seeps: Molecular proxies for anaerobic methane oxidation. Geochimica et Cosmochimica Acta65: 1611–1627.
58.
PrahlFGMuehlhausenLALyleM (1989b) An organic geochemical assessment of oceanographic conditions at MANOP Site C over the past 26,000 years. Paleoceanography4: 495–510.
59.
QasimSZ (1982) Oceanography of the northern Arabian Sea. Deep Sea Research Part A: Oceanographic Research Papers29: 1041–1068.
60.
Sales De FreitasFPancostRArndtS (2017) The impact of alkenone degradation on UK’37 paleothermometry: A model-derived assessment. Paleoceanography32: 648–672.
61.
SaraswatRLeaDWNigamRet al. (2013) Deglaciation in the tropical Indian Ocean driven by interplay between the regional monsoon and global teleconnections. Earth and Planetary Science Letters375: 166–175.
62.
SchoutenSHopmansECSchefußEet al. (2002) Distributional variations in marine crenarchaeotal membrane lipids: A new tool for reconstructing ancient sea water temperatures?Earth and Planetary Science Letters204: 265–274.
63.
SchulteSRostekFBardÉet al. (1999) Variations of oxygen-minimum and primary productivity recorded in sediments of the Arabian Sea. Earth and Planetary Science Letters173: 2015–2221.
64.
SluijsASchoutenSPaganiMet al. (2006) Subtropical Arctic Ocean temperatures during the Palaeocene/Eocene thermal maximum. Nature441: 610–613.
65.
StaubwasserMSirockoFGrootesPMet al. (2003) Climate change at the 4.2 ka BP termination of the Indus valley civilization and Holocene south Asian monsoon variability. Geophysical Research Letters30: 1425–1429.
66.
SteinR (1990) Organic carbon content/sedimentation rate relationship and its paleoenvironmental significance for marine sediments. Geo Marine Letters10: 37–44.
67.
SuthhofAJennerjahnTCSchäferPet al. (2000) Nature of organic matter in surface sediments from the Pakistan continental margin and the deep Arabian Sea – amino acids. Deep Sea Research Part II: Topical Studies in Oceanography47: 329–351.
68.
SyvitskiJPMMillimanJD (2007) Geology, geography, and humans’ battle for dominance over the delivery of fluvial sediment to the coastal ocean. The Journal of Geology115: 1–19.
69.
SyvitskiJPMVörösmartyCJKettnerAJet al. (2005) Impact of humans on the flux of terrestrial sediment to the global coastal ocean. Science308: 376–380.
70.
WeijersJWHSchoutenSHopmansECet al. (2006a) Membrane lipids of mesophilic anaerobic bacteria thriving in peats have typical archaeal traits. Environmental Microbiology8: 648–657.
71.
WeijersJWHSchoutenSSluijsAet al. (2007) Warm arctic continents during the Palaeocene–Eocene thermal maximum. Earth and Planetary Science Letters261: 230–238.
72.
WeijersJWHSchoutenSSpaargarenOCet al. (2006b) Occurrence and distribution of tetraether membrane lipids in soils: Implications for the use of the TEX86 proxy and the BIT index. Organic Geochemistry37: 1680–1693.
73.
WyrtkiK (1973) Physical oceanography of the Indian Ocean. In: ZeitzschelBGerlachSA (eds) The Biology of the Indian Ocean. Ecological Studies (Analysis and Synthesis), vol. 3. Berlin: Springer, pp. 18–36.
74.
XingLZhaoMGaoWet al. (2014) Multiple proxy estimates of source and spatial variation in organic matter in surface sediments from the southern Yellow Sea. Organic Geochemistry76: 72–81.
75.
XuFJiZWangKet al. (2016) The distribution of sedimentary organic matter and implication of its transfer from Changjiang Estuary to Hangzhou Bay, China. Open Journal of Marine Science6: 103–114.
76.
ZhangTXingLZhangHet al. (2012) Decadal changes and sources analysis of microbial biomarker GDGTs in the East China Sea sediments. Marine Geology & Quaternary Geology32: 87–95 (in Chinese with English abstract).
77.
ZhaoMBeveridgeNASShackletonNJet al. (1995) Molecular stratigraphy of cores off Northwest Africa: Sea surface temperature history over the last 80 ka. Paleoceanography10: 661–675.
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