晚全新世湖北神農(nóng)架高精度石筍碳同位素記錄.pdf

1、學(xué)位論文獨(dú)創(chuàng)性聲明本人鄭重聲明：所提交的學(xué)位論文是本人在導(dǎo)師指導(dǎo)下進(jìn)行的研究工作和取得的研究成果。本論文中除引文外，所有實(shí)驗(yàn)、數(shù)據(jù)和有關(guān)材料均是真實(shí)的。本論文中除引文和致謝的內(nèi)容外，不包含其他人或其它機(jī)構(gòu)已經(jīng)發(fā)表或撰寫過的研究成果。其他同志對(duì)本研究所做的貢獻(xiàn)均已在論文中作了聲明并表示了謝意。學(xué)位論文作者簽名：丑锍塌日期：_班掌衫學(xué)位論文使用授權(quán)聲明研究生在校攻讀學(xué)位期問論文工作的知識(shí)產(chǎn)權(quán)單位屬南京師范大學(xué)。學(xué)校有權(quán)保存本學(xué)位論文的電子和

2、紙質(zhì)文檔，可以借閱或上網(wǎng)公布本學(xué)位論文的部分或全部內(nèi)容，可以采用影印、復(fù)印等手段保存、匯編本學(xué)位論文。學(xué)?？梢韵驀矣嘘P(guān)機(jī)關(guān)或機(jī)構(gòu)送交論文的電子和紙質(zhì)文檔，允許淪文被查閱和借閱。(保密論文在解密后遵守此規(guī)定)保密論文注釋：本學(xué)位論文屬于保密論文，密級(jí)：——保密期限為——年。學(xué)位論文作者簽名：互紀(jì)蔦指導(dǎo)教師簽名：日期：、f妒●z占日期：pl鍛乒形AbstractAbstractThereconstructionofpaleoclimate

3、andpaleoenvironmentbasedonspeleothemisDaidmoreandmoreattention，andhasobtainedmanysignificantachievementsAmongalltheavailableclimaticindexes，themostcommononeisstableoxygenisotope(61801However，theinterpretationofitsclimati

4、csignificaneisstillauestioned，whichrequiresotherindexes(613c，graylevel，traceelements，layerthickness，etc1toenrichpaleoclimatestudyInviewofthis，hereahighresolutiontimeseriesforthesuccessive4295years(1I8-4413aBP)isreconstru

5、ctedonthebasisof32high—precisionUIThdatingagesand1864oxygenandcarbonisotopicdataderivedfromthreestalagmites(BF4，BFI，SN)inXiniucaveinHubeiProvince，centralChinaThelong-tenlltrendofXiniucave8180recordfollowsthesummerinsolat

6、ionat33。Nbutthe613CrecordshowsnosignificantlongtermtrendVariationsinthe81JCvaIuesaremainlycontrolledbythesoilCOzproductivitycausedbybiomassandmicrobialactivityandreflectthelocalclimateconditionsThehigher8J3CvalueofXiniuc

7、aveco盯espondtothewarmandhumidclimate，andthelower∥Cvaluemayindicatecold-dryclimateTheXiniucaVe613CclearlyrecordedthelateHoloceneclimatechangesinHubei，andisrathersensitivetothe1ittleIceAgeRelatively，theLittleIceAgestartedl

8、aterfADI520)withthebroadcharacteristicsofcold-dry／warm—humidcycles-ThemedievalwarmperiodhadalongerdurationThevarationin813CrecordsiswellconsistentwiththePDOindexondecadaltocentennialscales，presentinganegativecorrelationb

9、etweenthemThestrongcorrelationindicatesthatthePDOhasimportantinfluenceontheEastAsiansummermonsoonprecipitationGIobaIclimatechangeiscausedbyacombinationofinternalandexternalforcingfactors，andthesunisthemostimportantoneOur

10、dataimplythatsolarradiationandvolcanicactivitymayaffectseasurfacetemperaturesfirstly，andthentheregionalclimatethroughoceancurrentsand／oratmosphericcirculationsThepowerspectralanalysisofthethreestalagmites613Crecordsshows