資源描述：
《更新世晚期以來熱帶太平洋與印度洋.ppt》由會員上傳分享，免費(fèi)在線閱讀，更多相關(guān)內(nèi)容在教育資源-天天文庫。
1、更新世晚期以來熱帶太平洋與印度洋之海洋初級生產(chǎn)力記錄OceanicPrimaryProductionintheTropicalPacificandIndianOceansDuringtheLatePleistocene言婉婷Wan-TingYEN國立臺灣海洋大學(xué)應(yīng)用地球科學(xué)研究所IntroductionReconstructingpastvariationsofprimaryproductionduringPleistoceneclimaticcyclesisanimportantrequiremen
2、tforestimatingtheeffectsoftheocean’sbiologicalpumpontheatmosphericCO2concentrationthroughtime.Paleoproductivityreconstructionsshouldalsoprovideinformationaboutclimatedynamics.DiscussionENSOMaterial30°E60°E90°E120°E150°E180°150°W120°W90°W20°S20°N0°Analyz
3、edthecoccolithophorecommunitypreservedinelevendeep-seacorestakenfromthetropicalIndianandPacificoceans.BytuningoxygenisotoperecordsfromforaminiferainmostofthecorestotheSPECMAPstackedrecord,samplingachievesatemporalresolutionof910000years.MethodsThecoccol
4、ithophoreFlorisphaeraprofundalivesinthedeep-photiczone.Asproductivityincreases,therelativeabundanceofF.profundadecreases.MethodsUsingtheleastsquaresmethodtesteddifferenttypesofequationstodeterminethebestfitforthedistributionofFpversusPP.PP=617-[279xlog(
5、Fp+3)]Fpishighlycorrelatedwithprimaryproductionestimatedfromsatelliteinformation.MethodsCoretop的F.profundaBeaufortetal,(1997)衛(wèi)星估計(jì)的ppMethodsPaleoproductivityestimatedfromindependentindicatorsisinverygoodagreementwiththeproductivitydeducedfromtheabundance
6、ofF.profunda.Beaufortetal,(1997)MethodsBeaufortetal,(2001)TheePPrecordsshowlargeamplitudevariabilitywithregionalsimilaritiesandcontraststhatareexploredusingempiricalorthogonalfunctions(EOFs).010050128150Age(kyr)primaryproduction(gCm-2yr-1)Methods0100501
7、28150Age(kyr)Beaufortetal,(2001)TwosignificantEOFseries(EOF-1andEOF-2)havebeenextractedforthelast180kyfromtheeightcores.ResultsItgivesamuchclearerpictureoftheoppositionindynamicbetweenthewesternandeasternPacificePPs.Thiscyclicoppositioncanalsobeseenwhen
8、comparingbasinaverageregionalrecords.Beaufortetal,(2001)30°E60°E90°E120°E150°E180°150°W120°W90°W20°S20°N0°ResultsBeaufortetal,(2001)冰期冰期間冰期間冰期ResultsBeaufortetal,(2001)ResultsA30-kyperiodhasbeenfoundinseriesfromthetropicalandtrop
