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| Fundamentals of Aerosol Photoacoustic Spectroscopy | |
| 项目编号 | http://gepris.dfg.de/gepris/projekt/394626344 |
| Professor Dr. ChristophHaisch | |
| 项目主持机构 | Technische Universität München (TUM) |
| 开始日期 | 2018 |
| 英文摘要 | Globallyaveragedtemperatureobservationshaveincreasedsincetheonsetofindustrialization,andincreaserateshavebeenparticularlyhighatthenorthernhighlatitudes.Warmerconditionsthreatentodegradethevastpooloforganiccarboncurrentlystoredintheinnorthernpermafrostsoils(estimatedat1330-1580petagram),withpotentiallydrasticconsequencesforglobalclimate.ThecarboncyclewithinArcticpermafrostecosystems,aswellasthesustainabilityofcarbonpools,isnotonlycontrolledbytemperatureconditions.TheamountofcarbonemittedtotheatmosphereinformofCO2orCH4,dependstronglyonotherenvironmentalboundaryconditionssuchasmoisturecontent,temperature,orpHofthesoil.Alsothequalityoftheorganicmatter(e.g.contentofnutrients,nutrientstoichiometryandcarboncompounds)playsadominantrole,withphosphorus(P)beingofhighimportance.Thepotentialinfluenceofother,minorchemicalelementshavebeenlargelyneglectedinthiscontext.Morespecifically,twoelementshavebeenshowntobehighlyimportantforcarbonfixationandturnoverinmarinesystems,i.e.silicon(Si,importantforC-fixationbydiatoms)andcalcium(Ca,importantforC-fixationbycoccolithophores).Forterrestrialandsemiaquaticsystems,however,onlyfewstudieshaveanalyzedlinksbetweenSiandCacontentandcarbonturnoverrates,andevenfewerresultshaveyetbeenpublishedforpermafrostsoilsdespitethepotentialimportanceforcurrentandfuturecarboncycleprocesses.SiliconwasshowntomobilizePfromsoilbindingsites,thereforeincreasingPavailability,whereasCaisknowntodecreasePavailabilitybyforminginsolubleCa-Pphases.TheaimofthisprojectistoconstraintheneteffectofcompetingprocesseslinkedtotheavailabilityofSiandCa,andtheireffectonPavailability,onthemineralizationoforganicmatterindegradingpermafrostsoils,andquantifypotentialfeedbackswithclimatechange.Wewillexecutemanipulationexperimentsbothin-situandinthelaboratory,whichwilllinkenhancedSiand/orCacontents(mimickingmobilizationduringpermafrostthaw)tochangesindecomposition/mineralizationratesinthesoil,andrelatedshiftsinCO2/CH4emissionsfrompermafrostecosystems.TheseresultswillsubsequentlybeusedtotestiftheconsiderationofSiandCaavailabilitycanimprovetheperformanceofaprocess-basedmodelwhencomparedagainstpan-Arcticcarbonfluxobservations.CombiningprognosticsimulationsofthawdepthwithdataontheverticaldistributionofSiandCapools,wewillfurthermoreestimatehowSiandCaavailabilitymaybeaffectedthroughincreasesinthawdepthunderfutureclimatechange.Takentogether,theseresultswillallowassessingtheimpactofSiandCaavailabilityoncarbonfluxesinpermafrostsoils,andtheircontributiontothefeedbacksbetweenpermafrostcarboncycleprocessesandfutureclimatechange. |
| 学科分类 | 0503 - 物理化学;05 - 化学科学 |
| 资助机构 | DE-DFG |
| 项目类型 | Research Grants |
| 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/73287 |
| 推荐引用方式 GB/T 7714 | Professor Dr. ChristophHaisch.Fundamentals of Aerosol Photoacoustic Spectroscopy.2018. |
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