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| SECCO- Chile: The coupled vegetation, weathering, erosion, and sediment-export response to climate change unravelled from novel proxies in Chilean marine sediment | |
| 项目编号 | http://gepris.dfg.de/gepris/projekt/408246516 |
| sProfessorin Dr. AnneBernhardt | |
| 项目主持机构 | Freie Universität Berlin |
| 开始日期 | 2018 |
| 英文摘要 | Understandinglandscaperesponsetoclimatechangeisacentralprobleminthegeosciencestoday,assubstantialfuturechangesinprecipitationpatternsandintensityareexpected.Earth'ssurfaceisvulnerabletocomplexfeedbacksbetweenclimate,hydrology,vegetation,weathering,erosion,andsedimentdepositionthataffecttheevolutionoflandscapesthatweliveon.However,preciselyhowvegetation,weatheringanderosion,andassociatedsedimentdynamics,respondtoclimatechangeiscurrentlyunknown.Thisgapinknowledgeseverelyobstructstheinterpretationofmarinesedimentaryrecordsasarchivesofchangesinclimateand/orsurfaceprocesses.InChile,thereispublishedevidenceforadirectresponsebetweenanonshoreclimaticforcingandtheoffshoresedimentaryarchive:followingonshorearidificationinthelastdeglacial,turbidite-depositthicknessandfrequencystronglydecreasedoffshore.Thisprojectseekstoidentifythecascadeofchangesinweathering,erosion,andsedimentexporttotheoceanfollowinghydrologicandvegetationchangesfromtheLastGlacialMaximum(LGM)tothepresentalongtheChileancoast.Toachievethisgoal,welinkthedisciplinesofsedimentarysystemsresearch,geochemistry,andbiologytojointlyexplorethefeedbacksbetweenchangesinhydrologyandvegetationandEarth-surfaceprocessesoveralargespatial(theChileancoast)andtemporal(LGMtoHolocene)scale.WehypothesizethattheimpactofdeglacialclimatechangeonChileanlandscapesisstronglymodulatedthroughthepresenceofvegetation.Hence,wesuggestthattemporallagsoccurredbetweenchangesinclimate/hydrologyandvegetation,andchangesinweathering,erosion,andsedimentexport.Weproposetotestthishypothesisbyapplyingauniquecombinationofnovelstate-of-the-artproxiesthatallowthedetectionofchangesinvegetationandhydrology(bylipidbiomarkeranalysisandtheirdelta13CanddeltaDisotopecomposition),weathering(byusingListableisotopes,delta7Li),anderosion(byusingnovelcosmogenicmeteoric10Be/9Beratios)thatfolloweddeglacialaridification.Inafirstworkpackage(WP1),wewillidentifypresent-dayspatialdifferencesintheevolutionoftheseproxiesalongtheChileanclimaticgradient,bysamplingmodernerosionproductsfromriverineandoffshoresurfacesedimentfromcoretops.InWP2,weusethesamemethodsonindependentlydatedmarinesedimentaryarchivesthatprovidethedepositionallegacynecessarytoreconstructthetemporaldynamicsoftheseproxiesfromtheLGMtothepresentday,asspatiallyrepresentativearchivesaremostlyabsentonshore.Thismoderncalibration(WP1)incombinationwiththepaleo-record(WP2)willallowustoidentifyandmechanisticallyunderstandthesourcesofvariabilityinandthetemporalleadsandlagsbetweenchangesinvegetation,weathering,erosion,andsedimentexporttotheoceanfollowingamajorhydrologicalchange. |
| 学科分类 | 0802 - 地质学;08 - 地球科学 |
| 资助机构 | DE-DFG |
| 项目类型 | Priority Programmes |
| 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/69382 |
| 推荐引用方式 GB/T 7714 | sProfessorin Dr. AnneBernhardt.SECCO- Chile: The coupled vegetation, weathering, erosion, and sediment-export response to climate change unravelled from novel proxies in Chilean marine sediment.2018. |
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