{"refrec":{"BRefID":311364,"RR":"<b>Dale, A.W.; Flury, S.; Fossing, H.; Regnier, P.; Røy, H.; Scholze, C.; Jørgensen, B.B.</b> (2019). Kinetics of organic carbon mineralization and methane formation in marine sediments (Aarhus Bay, Denmark). <i>Geochim. Cosmochim. Acta 252</i>: 159-178. <a href=\"https://dx.doi.org/10.1016/j.gca.2019.02.033\" target=\"_blank\">https://dx.doi.org/10.1016/j.gca.2019.02.033</a>","BEntID":303725,"PublicFlag":1,"CheckedFlag":1,"wosflag":1,"vabbflag":1,"RefStringPartII":". <i>Geochim. Cosmochim. Acta 252</i>: 159-178. <a href=\"https://dx.doi.org/10.1016/j.gca.2019.02.033\" target=\"_blank\">https://dx.doi.org/10.1016/j.gca.2019.02.033</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Dale, A.W.; Flury, S.; Fossing, H.; Regnier, P.; Røy, H.; Scholze, C.; Jørgensen, B.B.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Dale, A.W. <i>et al.</i>","Englishabstract":"Sediments were sampled at nine stations on a transect across a 7–10 m thick Holocene mud layer in Aarhus Bay, Denmark, to investigate the linkages between CH<sub>4</sub> dynamics and the rate and depth distribution of organic matter degradation. High-resolution sulfate reduction rates determined by tracer experiments (<<sup>35</sup>S-SRR) decreased by several orders of magnitude down through the mud layer. The rates showed a power law dependency on sediment age: SRR (nmol cm<sup>−3</sup> d<sup>−1</sup>) = 10<sup>6.18</sup> × Age<sup>−2.17</sup>. The rate data were used to independently quantify enhanced SO42− transport by bioirrigation. Field data (SO<sub>4</sub><sup>2–</sup>, TCO<sub>2</sub>, T<sub>13</sub>CO<sub>2</sub>, NH<sub>4</sub><sup>+</sup>and CH<sub>4</sub> concentrations) could be simulated with a reaction-transport model using the derived bioirrigation rates and assuming that the power law was continuous into the methanogenic sediments below the sulfate-methane transition zone(SMTZ). The model predicted an increase in anaerobic organic carbonmineralization rates across the transect from 2410 to 3540 nmol C cm<sup>−2</sup> d<sup>−1</sup> caused by an increase in the sediment accumulation rate. Although methanogenesis accounted for only ∼1% of carbon mineralization, a large relative increase in methanogenesis along the transect led to a considerable shallowing of the SMTZ from 428 to 257 cm. Methane gas bubbles appeared once a threshold in the sedimentation accumulation rate was surpassed.The <sup>35</sup>S-measured SRR data indicated active sulfate reduction throughout the SO<sub>4</sub><sup>2−</sup>zone whereas quasi-linear SO<sub>4</sub><sup>2−</sup> gradients over the same zone indicated insignificant sulfate reduction. This apparent inconsistency, observed at all stations, was reconciled by considering the transport of SO<sub>4</sub><sup>2−</sup> into the sediment by bioirrigation, which accounted for 94 ± 2% of the total SO<sub>4</sub><sup>2−</sup> flux across the sediment-water interface. The SRR determined from the quasi-linear SO<sub>4</sub><sup>2−</sup>gradients were two orders of magnitude lower than measured rates. We conclude that models solely based on SO<sub>4</sub><sup>2−</sup> concentration gradients will not capture high SRRs at the top of the sulfate reduction zone if they do not properly account for (i) SO<sub>4</sub><sup>2−</sup> influx by bioirrigation, and/or (ii) the continuity of organic matter reactivity with sediment depth or age.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Kinetics of organic carbon mineralization and methane formation in marine sediments (Aarhus Bay, Denmark)","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-02 01:31:57.068804","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":"Marine; Seabed; Gas accumulation; Methanogenesis; Sulfate reduction;Organic matter mineralization kinetics; Bioirrigation; Model","OtherDescriptors":null,"Notes":null,"AnaPub":2019,"MonPub":null,"DateUpdate":"2019-06-03","DateCreate":"2019-05-28","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":"WOS:000462774200009","VABBcode":null,"OpenAcc":0,"DOI":"10.1016/j.gca.2019.02.033"},"refs":null,"anarec":{"AnaID":311364,"PubliDate":2019,"Pagination":"159-178","XtraPublOfAnaID":null,"ISBN":null,"Volume":"252","Issue":null,"BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":42901,"SerRR":"Geochimica et Cosmochimica Acta. 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