简介:appendicularians上的桡脚类的动物的潜在的抑制在领域和试验性的条件里被发现。appendicularians和planktonic桡脚类的动物的丰富和分发在华南海(SCS)的西北大陆人架上在夏天期间与他们的关联的参考被学习。基于地形学和调查区域的水质量,它被划分成三个分区:区域我(东方Leizhou半岛的沿海的水)与低温度,咸度和高叶绿素一(Chl一)集中,有低温度的区域II(东方的沿海的水和东南海南岛),高咸度和中等Chl集中和区域III(近海从Leizhou半岛流水到海南岛)与高温度,高咸度和低Chl集中。appendicularians和桡脚类的动物的种类丰富增加了从对沿海近海水,和高价值在区域III被观察。appendicularian和桡脚类的动物丰富的分发通常减少了从对沿海近海水,与最高的价值在区域我。我们的结果建议appendicularians和桡脚类的动物的分发模式显著地不同,由于物理、生物的因素的影响。appendicularians上的远洋的桡脚类的动物的否定影响没被发现基于在在SCS的西北大陆人架中的situ数据。
简介:TheestablishmentoftheSouth-Asianhigh(SAH)inAprilandMayovertheIndochinaPeninsula(IP)isinvestigatedbasedontheERA-40reanalysisdata.TheresultshowsthattheSAHisgeneratedandstrengthenedovertheIPlocally,ratherthanmovingwestwardtotheIPfromtheWesternPacific.AftertheSAHestablishmentthetropicaluppertropospherictrough(TUTT)formsabovetheoceantotheeastofthePhilippines.WehavefoundthattheprincipaltriggeringfactorofboththeSAHconstructionandtheTUTTformationisthevariationintheSouthernAsianatmosphericdiabaticheatingregime.InlateApril,boththeclimbingeffectofShanPlateauandthelocalsurfacesensibleheatingcontributetolocalrainfallovertheIP.Thenthelocalupdraftandupper-airdivergencearestrengthened,beingresponsiblefortheSAHformedinthesouthernpartoftheIP.AsconvectionmovesnorthwardalongtheAustralian-Asian"maritimecontinent"andtheBayofBengal(BoB)summermonsoonbegins,theconvectionisintensifiedinMayontheeasternBoB.ThestrongconvectionresultsintheSAHenhancingandexpandingwestward,accompaniedbyreinforcedmeridionalflowtotheeastofSAH,whereresponsesofthecirculationtodiabaticheatingarriveataquasi-steadystate.Meanwhile,becauseofthepositivegeopotentialvorticityadvectionresultingfromupperequatorwardflow,thelocalpositiverelativevorticityincreasesovertheoceantotheeastofthePhilippines,makingthetropicaluppertropospherictrough(TUTT)formaround150°E.
简介:Daily850-hPameridionalwindfieldsinEastAsiafromMarchtoSeptember2002wereusedtoestablishamodeloftheprincipaloscillationpattern(POP).Thismodelwasthenusedtoconductindependentextended-rangeforecastsoftheprincipaltemporalandspatialvariationsinthelow-frequencymeridionalwindfieldonatimescaleof20-30days.ThesevariationsaffecttheoccurrenceofheavyprecipitationeventsinthelowerreachesoftheYangtzeRivervalley(LYRV).Theresultsof135forecastexperimentsduringthesummerhalfyearshowthatthepredictedandobservedanomaliesarestronglycorrelatedataleadtimeof20days(meancorrelationgreaterthan0.50).Thisstrongcorrelationindicatesthatthemodeliscapableofaccuratelyforecastingthelow-frequencyvariationsinmeridionalwindthatcorrespondedtothe3heavyprecipitationeventsintheLYRVduringthesummerof2002.Furtherforecastexperimentsbasedondatafrommultipleyearswithsignificant20-30-dayoscillationsshowthatthesepredictionmodesareeffectivetoolsforforecastingthespace-timeevolutionofthelow-frequencycirculation.ThesefindingsofferpotentialforimprovingtheaccuracyofforecastsofheavyprecipitationovertheLYRVatleadtimesof3-4weeks.