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ID:34028345
大小:3.29 MB
页数:82页
时间:2019-03-03
《enso现象对东太平洋黄鳍金枪鱼资源与渔场的影响》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、●上海海洋人学硕士学位论文SST分布进行空间叠加分析。在正常气候条件下,东太平洋暖池的暖水的面积和强度在春夏季(3.8月)达到鼎盛时期,高CPUE集中在O~100N、27"29℃等温线间;秋季(9.11月)逐月减弱,高CPUE开始向赤道以南移动;到冬季(12、l、2月)降到最低,高CPUE向南可达到150S,散布在22"'27℃等温线间。在厄尔尼诺发生期间,东太平洋暖池平均SST升高,面积增大,西界西扩,南界南移。CPUE分布的SST范围较窄,在150N,--.150S,25---.30。C等温线间,高CUPE值分布在27"-
2、'29℃等温线间,在厄尔尼诺强盛时期,高CUPE值减少并向低温海域迁移。在拉尼娜发生期间,东太平洋暖池平均SST降低,面积减小,西界东撤,南界北缩。CPUE分布SST范围较广,在150N'"200S,20""29℃等温线间均有分布,高CUPE值分布在24~27℃。当东太平洋暖池存在时,高CPUE则聚集在27"'-'29℃等温线间。在拉尼娜强盛时期,高CUPE值减少甚至消失。关键词:黄鳍金枪鱼,ENSO,东太平洋,海表水温,海表温度距平III●上海海洋大学硕士学位论文ENSOImpactonFishingGroundOfyell
3、owfintuna(Thunnusalbacares)intheEasternPacificOceanABSTRACTBasedonJanpanesecatchstatisticdatafromtunapurseseinerfleetsandenvironmentdatawhichcontainsseasurfacetemperatureanomaly(SSTA),seasurfacetemperature(SST)duringthesameperiodintheEasternPacificOcean,theresourcea
4、bundanceofyellowfintuna,spatial—temporaldistributionoffishinggroundandtheirrelationshipswithvariousenvironmentofmiddlescaleclimatejustasinE1NinoandLaNinaconditionareanalyzedrespectivelybythemeansofGeographyInformationSystem(GIS)softMarineExplorer4.0,graycorrelationa
5、ndstatisticalmethods.Theresultsaresummarizedasfollows:(1)ThroughanalyzingtheSSTAinNin03seaareafrom1975to2004,thispaperdeterminedthestartingandendingyearsandmonthsofElNinoandLaNinaevents.TheresultsshownmattheeventofENSOoccurredfrequentlyin1980sand1990s.TheElNinoof199
6、7/1998Wasthestrongesteventsincethebeginningdataofhistory.(2)FrommonthlyaverageSSTfrom1975to2004intheEastemPacificOcean(75--一1450W,250S--,300N),wecanseethatthechangetendencyofmonthlyaverageSSTfrom1975to2004Wasalmostthesame.ThechangetendencyofmonthlyaverageSSTwentupfr
7、omJanuarytoAprilanddeclinedfromMaytoDecember.ThemonthlyaverageSSTbetweenyearschangedalot.Comparedwithnormalyear,theSSTdeclinedinE1NinoconditionandthevaluewentupinLaNinacondition.ThetotalaverageSSTineverylongtitudehadthesamedevelopmenttendency.TheSSTdeclinedsmallerfr
8、om180Wto1430Wandgreatlyfrom730Wto1080W.ButtheriseforSSToccurdfrom1080Wto180W:TheSSTineverylongtitudebetweenyearschangedalot.Comparedwithno
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