{"refrec":{"BRefID":70203,"RR":"<b>Abril, G.; Borges, A.V.<\/b> (2004). Carbon dioxide and methane emissions from estuaries, <b><i>in<\/i><\/b>: Tremblay, A. <i>et al.<\/i> (Ed.) <i>Greenhouse gases emissions from natural environments and hydroelectric reservoirs: fluxes and processes. Environmental Science Series,<\/i> : pp. 187-207","BEntID":66264,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":", <b><i>in<\/i><\/b>: Tremblay, A. <i>et al.<\/i> <i>Greenhouse gases emissions from natural environments and hydroelectric reservoirs: fluxes and processes. Environmental Science Series,<\/i> : pp. 187-207","DocTypID":17,"DocType":"Book chapters","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Abril, G.; Borges, A.V.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Abril, G.; Borges, A.V.","Englishabstract":"Carbon dioxide and methane emissions from estuaries are reviewed in relationwith biogeochemical processes and carbon cycling. In estuaries, carbondioxide and methane emissions show a large spatial and temporalvariability, which results from a complex interaction of river carbon inputs,sedimentation and resuspension processes, microbial processes in watersand sediments, tidal exchanges with marshes and flats and gas exchangewith the atmosphere. The net mineralization of land-derived organic carbonleads to high CO<sub>2<\/sub> atmospheric emissions (10-1000 mmol.m<sup>-2<\/sup>.d<sup>-1<\/sup> i.e.44-4400 mg.m<sup>-2<\/sup>.d<sup>-1<\/sup>) from inner estuarine waters and tidal flats and marshsediments. Estuarine plumes at sea are sites of intense primary productionand show large seasonal variations of pCO<sub>2<\/sub> from undersaturation to oversaturation;on an annual basis, some plumes behave as net sinks of atmosphericCO<sub>2<\/sub> and some others as net sources; CO<sub>2<\/sub> atmospheric fluxes inplumes are usually one order of magnitude lower than in inner estuaries.Methane emissions to the atmosphere are moderate in estuaries (0.02-0.5 mmol.m<sup>-2<\/sup>.d<sup>-1<\/sup> i.e. 0.32-8 mg.m<sup>-2<\/sup>.d<sup>-1<\/sup>), except in vegetated tidal flats andmarshes, particularly those at freshwater sites, where sediments may beCH<sub>4<\/sub>-saturated. CH<sub>4<\/sub> emissions from subtidal estuarine waters are the resultof lateral inputs from river and marshes followed by physical ventilation,rather than intense in-situ production in the sediments, where oxic andsuboxic conditions dominate. Microbial oxidation significantly reduces theCH<sub>4<\/sub> emissions at low salinity (<10) only.","AbstractOtherLang":null,"BibLvlCode":"AMS","StandardTitle":"Carbon dioxide and methane emissions from estuaries","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2024-12-10 01:33:17.368041","timezone_type":1,"timezone":"+01:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":2004,"MonPub":null,"DateUpdate":"2005-01-31","DateCreate":"2005-01-31","SecASFANote":null,"ConfID":null,"PeerRev":0,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0},"refs":null,"anarec":{"AnaID":70203,"PubliDate":2004,"Pagination":"187-207","XtraPublOfAnaID":null,"ISBN":"3540234551","Volume":null,"Issue":null,"BRefMon":70204,"BRefMonRR":"<b>Tremblay, A. <i>et al.<\/i> (Ed.)<\/b> (2004). Greenhouse gases emissions from natural environments and hydroelectric reservoirs: fluxes and processes. <i>Environmental Science Series<\/i>. Springer-Verlag: New York. ISBN 3540234551. 730 pp.","BRefXtra":null,"BRefXtraRR":null,"SerBRefID":70205,"SerRR":"Environmental Science Series. Springer-Verlag: New York.  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