長江下游石筍記錄的中全新世東亞季風(fēng)降水高頻變率.pdf

1、碩士論文：長江下游石筍記錄的中全新世東亞季風(fēng)降水高頻變率AbstractBasedon9“、hdatingagesand1358dataofstableisotopecompositionsaswellasannuallayersofthestalagmitesinYixingcave。JiangsuprovinceandNanyangcave，Henanprovince，twohighresolutionclimaterecordso

2、fEastAsianmonsoonduringmid—Holocene(74kaBP)arereconstructedBycompmangthestalagmiterecordswiththedataoficecolx，ocean，lakeandsoon，theauthoranalyzesthelinksbetweenEastAsianmonsoonclimateandtheglobalchangesduringmid—Holocene

3、andpreliminarilyinvestigatesdrivenforcesofthehighfrequencyoscillationofEastAsianmonsoonclimateAsourdataindicated，thereismarkedlynegativecorrelationbetweenthechangesofstalagmite6”O(jiān)andtheprecipitationfluctuationTheprecipRa

4、tioninNanyaugareaHenanprovincedecreasedduringaperiodof6155～4695aBPandincreasedinYixingregion，Jiangsuprovinceduringaperiodof56爭V516kaBEBothtwoareas’precipitationpresemdistinctoscillationoncentennial—todecadal—scale，andthe

5、abruptchangeofprecipitationmighthaveworkedontheevolutionofnewstoneeivifizationinthe10ciTheoverallfluctuatetrendsofthecarbonandoxygenisotopecnrvesofthestalagrmteinYixing，Jiangsuprovinceisuniformbutexistsprominentdiscrepan

6、cyindetail：itscarbonisotopecBrvepresentsthreebigapexesandtwodalesanditsoxygenisotopecurvecharacterizedwithhighfrequencyoscillationThechangeformatofthecarbonandoxygenisotopetimeseriesofthestalagmiteinNanyang，Henanprovince

7、issimilarbutitstrendsisreverseTheauthorsuggeststhattheregionecologicdiscrepanciesandthedifferentprodnctivityofsoilC02isthemaincauseofthevariabilityofthestalagmitecarbonisotope111egoodcorrespondingbetweenthetwostalagmites

8、61s0timeseriesand仃eeringA14CRcurveduringthecounterpartperiodsofmid—HolocenesuggeststhattheprecipitationchangeofEastAsianmonsoonismarkedlydrivenbythesolaractivityatthecentennialtodecadal—scale111ecyclesof79a，21a，10a，78aan

9、dsoonshownbyanalysisofoxygenandcarbonisotopepowerspectrumofthestalagmitescorrespondedtotheGleissbergperiod，themagneticperiodandthesunspotperiodoftheSILllactivities，andfalltherdemonstratedthedrivenmechanismThegreyleveland

10、carbonisotopeseriesofthestalagmiteML(s)commendablycorrespondstotheseasonalrhythmofthestalagmiteannuallayersLowergreylevelandnegative6”Cofthestalagmiteaseconsistentwiththecompactertranslucencelaminaswhichwereformedinthedr

11、yperiodwhentheprecipitationmarkedlydecreasedOntheconWaryhighergreylevelandpositive(513CofthestalagmiteareconsistentwiththethickermilkywhitelayersdepositedduringthewarmandhumidpHiodwhichoccupiesthemosttimeofayearThestalag

12、miteMHs)6心OindicatestheprecipitationchangeinthelocusTheperiodsof71aand28ashownbyanalysisofits5”0powerspectrumrevealsthatEastAsianmonsoorlpreeipitationcorrelatedtotheENSOeventsduringthemidHoloceneKeywords：EastAsian11Aotts