Abstract
AbstractWe demonstrate the annual cycle of methane in fresh sediments of two lakes - Moszne (E Poland) and Skrzynka (W Poland). The vertical gradient in δ
Highlights
MethaQe prRductiRQ is aQ iPpRrtaQt part RI the JOREaO carERQ cycOiQJ
SRPe e[tra tePperature prRIiOes, which are QRt accRPpaQied by Jas saPpOiQJ, are shRwQ iQ )iJ. 2a. +RweYer, iQ Yery Oate suPPer, iQ the Lake SkrzyQka sediPeQts, the hiJhest tePperature has beeQ IRuQd at the depth RI abRut 0
IQ the autuPQ 13 the tePperature teQded tR iQcrease tR sediPeQt depth RI a1.3 P, aQd theQ decreased at Jreater depth
Summary
MethaQe prRductiRQ is aQ iPpRrtaQt part RI the JOREaO carERQ cycOiQJ (e.J. CraiJ aQd ChRu 182, .haiO aQd RasPusseQ 183, SteeOe et aO. 18) aQd PethaQRJeQic pathways are deterPiQed Ey cRe[istiQJ RrJaQic Patter, water, aQd EacteriaO actiYity. 183, SYeQsRQ aQd RRssewaOO 184), (4) QutrieQt aQd RrJaQic cRQteQt RI surIace sRiOs aQd their thickQess (+arriss aQd SeEacher 181). 18) Pay cRQtrRO the PethaQe IOu[ IrRP QaturaO wetOaQds. IQ this paper we repRrt seasRQaO YariatiRQs iQ YerticaO prRIiOes iQ cRQceQtratiRQ aQd carERQ isRtRpic cRPpRsitiRQ RI PethaQe. BasiQJ RQ the therPRdyQaPics, aQ iPpOicit assuPptiRQ cRuOd Ee appareQtOy Pade that carERQ isRtRpe IractiRQatiRQ IactRr EetweeQ the PethaQe precursRrs aQd PethaQe Jas, depeQds RQ tePperature. Based upRQ Ireshwater paddy sRiO iQcuEatiRQ e[periPeQts, the eQdPePEer į13C YaOue RI PethaQe prRduced IrRP acetate dissiPiOatiRQ is -3Å aQd the į13C YaOue RI C+4, IrRP CO2/+2 was estiPated tR Ee - tR -0Å (SuJiPRtR aQd :ada 13). ThereIRre, chaQJes iQ the reOatiYe ratiRs RI PethaQe IRrPatiRQ pathways Pay Oead tR tePpRraO aQd spatiaO YariatiRQs RI the į13C YaOue iQ C+4, thRuJh aQ RrJaQic Patter precursRr Pay shRw hRPRJeQeRus carERQ isRtRpic cRPpRsitiRQ
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