学科分类
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2 个结果
  • 简介:AnalternativeindexfortheonsetofsummermonsoonovertheSouthChinaSea(SCS)hasbeendesignedbasedonthereanalysisdataoftheNationalCentersforEnvironmentalPrediction-NationalCenterforAtmosphericResearch(NCEP/NCAR).ItisfoundthatthedifferencebetweenthegeopotentialthicknessoverGuangzhouandManilacanbeusedasanalternativeindexfortheonsetofsummermonsoonovertheSCS.SincetheconvectiveheatingaltersthegeopotentialheightandthedistancebetweenGuangzhouandManilaisofsynopticscaleinthegeostraphicframework,theindexcanrepresentthestrengthofheatingandthefirstbarocliniccellovertheSCS.Bycomparisonbetweendifferentindices,itisfoundthatthesummermonsoononsetovertheSCScanbeascertainedbytheverticalzonalwindshearbetween200hPaand850hPa,thezonalwindat850hPa,theOLRanomaly,andthealternativeindexdefinedinthepresentpaper.Themeridionalwindshearbetween200hPaand850hPaalwaysappearsovertheSCSmuchearlierthanthezonalwindshearandcannotbeusedasanindexunderconsideration.

  • 标签: 南海 夏季风 大气研究 重力势
  • 简介:Inordertoinvestigatetherelationshipbetweenthetraceelementsandthecharacteristicsoftheoysters,weanalyzedthetraceelementspresentinthegermplasmofoystersfromdifferentproducingareasintheJiaozhouBay.Theelementfingerprintswereestablishedtoreflecttheelementalcharacteristicsoftheoysters.Concentrationpatternsoftheelementsweredecipheredbyprinciplecomponentanalysis(PCA)andhierarchicalclusteranalysis(HCA).ThesixregionswerediscriminatedwithaccuracyusingHCAandPCAbasedontheconcentrationof16traceelements.Theelementswereviewedascharacteristicelementsoftheoystersandthefingerprintsoftheseelementscouldbeusedtodistinguishthequalityoftheoysters.

  • 标签: 微量元素 指纹图谱 胶州湾 牡蛎 中国 医药