《贵州冻雨初终日的气候变化及其异常年环流特征》.pdf

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1、中国麈学c墨握2015，31(20)：213—218ChineseAgriculturalScienceBulletin贵州冻雨初终日的气候变化及其异常年环流特征宋丹，唐延婧，白慧，庞庆兵l贵卅I省气象服务中心，贵阳550002；贵』、1,1省气候中心，贵阳550002；贵州省气象台，贵阳550002)摘要：为了补充和完善贵州冻雨在初(终)日以及相关高度场等方面的特征，利用1964年10月一2014年4月贵州省冻雨观测资料和NCEP／NCAR再分析资料，分析了冻雨初日、终日和冻雨期的气候特征，及其高相关季节异常年北半球500h

2、Pa的高度距平场特征。结果表明：冻雨初日渐晚、终日渐早、冻雨期渐短；初日多出现在11月中旬一l2月上旬，终日多出现在3月；冻雨初日异常年夏季北半球高度距平场主要表现为中高纬度槽脊强度的异常，反映为北美大槽强度相反的变化特征；冻雨终日冬季高度距平场反映为高纬度极涡中心位置和强度的变化；冻雨期异常年则表现为不同的遥相关型，偏少年反映为PJ波列，偏多年表现为ANA、NEP和AWE并存，在实际业务中可以结合该信号特征对其进行长期预测。关键词：冻雨；初日；终日；冻雨期；环流特征；贵州中图分类号：P466文献标志码：A论文编号：casb1

3、5040040ClimateChangeandAbnormalYears’CirculationCharacteristicsoftheBeginningandEndingDatesofFreezingRaininGuizhouSongDan，TangYanjing’，BaiHui，PangQingbing3(MeteorologicalServiceCenterofGuizhouProvince，Guiyang550002；GuizhouClimateCenter，Guiyang550002；GuizhouMeteorolo

4、gicalObservatory，Guiyang55oo02)Abstract：Thepaperaimstosupplementandimprovethefeaturesofthefreezingraininearly(end)daysandtheheightfieldinGuizhou，byusingtheobservationdataandNCEP／NCARreanalysisdataoffreezingraininGuizhoufromOctober1964toApril2014，thisarticleresearche

5、dclimatecharacteristicsoffreezingrain’Sbeginningdate，endingdateandfreezingrainperiod，alsothefeaturesofnorthernhemisphere’Sheightanomalyfieldsat500hPaofanomalousyearsinhighcorrelatedseasons．Resultsshowedthat：thebeginningdatesoffreezingrainweregraduallybecamelater，the

6、periodswerebecameshort，andtheendingdatesdidnotchangesignificantly．ThebeginningdatesusuallyappearedbetweenmidNovembertoearlyDecember，andtheendingdatesappearedintheMarch．Insummersofyearswithabnormalbeginningdatesoffreezingrainthe，northernhemisphere’sheightanomalymainl

7、ypresentedthecharacteristicoftrough-ridgestrength’sabnormalinmid—highlatitude，withchangesoppositetheintensityofnorthAmericantrough；inwintersofyearswithabnormalendingdatesoffreezingrain，heightanomalyfeaturedmainlybythepositionandintensityvariabilityofthepolarvortexin

8、highlatitude．Freezingrainperiodshoweddifferentteleconnection，asthePJwaveappearinginshorteryears，andANA，NEPandAWEcoexistinginlongeryears．Co