Climate Change Data Portal
| Controls on iron and sulfate reduction in Arctic fjord sediments under climate change | |
| 项目编号 | http://gepris.dfg.de/gepris/projekt/389371177 |
| Dr. KatjaLaufer | |
| 项目主持机构 | Aarhus University |
| 开始日期 | 2017 |
| 结束日期 | 2019 |
| 英文摘要 | Theprimaryobjectiveofthisprojectistounderstandhowthetwomostimportantprocessesforanaerobicoxidationoforganiccarbonarecontrolledinmarinesediments,namelythemicrobialreductionofironandofsulfate.Microbialmineralizationoforganicmatterisadrivingforcebehindmanyelementcyclesinmarinesediments.Thedominantterminaloxidantaffectsnotonlythegeochemistryofthesedimentbutalsothereleaseofnutrients,suchasiron,manganese,orphosphate.Theterminalelectron-acceptingprocesseschangewithdepthinthesediment,followingasequentialorder,whichisthoughttobedeterminedbythermodynamics.Yet,asubstantialspatialoverlapbetweenironandsulfatereductionisfrequentlyfound.Itappearsthatthecompetitionbetweeniron-andsulfate-reducingmicroorganismsisaffectedbymanyotherfactors,liketheavailabilityoftheelectrondonororthecrystallinityoftheiron,whatkineticallyconstrainsironreduction.However,itisnotunderstoodhowexactlythesedifferentfactorsinfluencethebalancebetweenironandsulfatereductioninmarinesediments.Iwillinvestigatehowthecompetitionbetweeniron-andsulfate-reducersiscontrolledinthearcticseabed,whichisstronglyaffectedbyclimatechange.TheongoingandpredictedwarmingoftheArcticOceanwillchangetheavailabilityofiron,duetoenhancedglacialrunoff,andoforganiccarbon,duetoreducedseaicecover,whatleadstoincreasedalgalproductivityandsedimentation.ItisnotunderstoodhowthesechangeswillinfluencethebalancebetweenironandsulfatereductionandconsequentlythebiogeochemistryinArcticsediments.ThefjordsonthewestcoastofSvalbard,whichareseverelyimpactedbyclimatechange,provideidealfieldsiteswherewarmAtlanticwatermeetscoldArcticwater.Inthesedimentsofthedifferentfjordscontrastinggeochemicalconditionscanbefound,includingconditionsfavoringeitherironorsulfatereduction.Iwillcombinegeochemical,microbiologicalandmolecularbiologicalanalysesofsedimentsthathavehighorlowloadingofironororganiccarbonwithcarefullyconceivedexperimentswiththesesedimentsaswellaspurecultureexperiments.ThestudywillrelievehowsensitivelyArcticsedimentswillrespondtoaltereddepositionalinflux.TheCenterforGeomicrobiologyatAarhusUniversityistheperfecthostbecauseoftheirgreatexpertiseinbiogeochemicalprocessesandmicrobialcommunitiesinmarinesedimentsandtheirexperienceandengagementinfieldworkintheArctic.ThepreliminaryworkthatIalreadyperformedforthisprojectshowedhowsensitivethebalancebetweenironandsulfatereductionistochangedironandorganiccarboncontentandhowIcanfurtherprogresswiththisstudy. |
| 学科分类 | 0803 - 地球化学;08 - 地球科学 |
| 资助机构 | DE-DFG |
| 项目类型 | Research Fellowships |
| URL | http://gepris.dfg.de/gepris/projekt/389371177?language=en |
| 国家 | DE |
| 语种 | 英语 |
| 文献类型 | 项目 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/69558 |
| 推荐引用方式 GB/T 7714 | Dr. KatjaLaufer.Controls on iron and sulfate reduction in Arctic fjord sediments under climate change.2017. |
| 条目包含的文件 | 条目无相关文件。 | |||||
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