Spatial and Temporal Patterns of Precipitation Intensity as Observed by the NAME Event Rain Gauge...
Transcript of Spatial and Temporal Patterns of Precipitation Intensity as Observed by the NAME Event Rain Gauge...
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ADVANCESINWATERSCIENCEVol.26,No.4Jul.,2015
DOI:1014042/jcnki321309201504001
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Table1 Lineartrendsofannualprecipitation,numberofprecipitationdaysandprecipitation
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Table3 Lineartrendsofaccumulatedamount,numberofdaysandintensityofannualrainstormsover1956—2013forthetenlargeriverbasinsofmainlandChina
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Table4 Numberofstationswithincreasingtrends(significantincreasingtrends)anddecreasingtrends(significantdecreasingtrends)ofmaximumprecipitationamountofoneday,continuousthreedaysandcontinuousfivedays,andtheirpercentagesinmainlandChina,1956—2013
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SpatialandtemporalpatternsofprecipitationvariabilityovermainlandChina:II:Recenttrends
RENGuoyu1,2,RENYuyu1,2,ZHANYunjian3,SUNXiubao2,4,LIUYanju1,2,CHENYu1,2,WANGTao2,4
(1.NationalClimateCenter,Beijing100081,China;2.LaboratoryforClimateStudies,CMA,Beijing100081,China;
3.NationalMeteorologicalInformationCenter,CMA,Beijing100081,China;
4.CollegeofAtmosphericScience,NanjingUniversityofInformationScience&Technology,Nanjing210044,China)
Abstract:Applyingprecipitationindicesseriesofqualitycontrolleddailydatafromover2300stations,thecharacteristicsoflongtermprecipitationvariationsoverthepast60yearsformainlandChinaareanalyzed.Themainconclusionsareasfollows:① NosignificantlongtermtrendsofannualandseasonalprecipitationpercentageanomalieshavebeenfoundformainlandChinaasawhole,thougharelativelysignificantdecreaseandincreasehavebeenseenfortheseasonalprecipitationpercentageanomaliesforautumnandwinterrespectively;② DecreaseinannualandsummerprecipitationmainlyoccurredincentralandsouthernNortheastChina,NorthChina,westernCentralChinaandSouthwestChina.Increasemainlyoccurredinsoutheasterncoastalregion,themidandlowerreachesoftheYangtzeRiver,theQinghaiTibetanPlateauandNorthwestChina;③ Thespatialpatternsoftheannualandseasonalprecipitationtrendswererelativelystable.ThedecreaseareasmigratedfromtheLoessPlateauandNorthChinatowardnortheastandsouthwestafter1990s,theincreaseareasinNorthwestChinaandtheQinghaiTibetanPlateaudidnotchangemuchormarginallyexpanded,andtheincreaseareasinnorthernNortheastChinaandthemidandlowerreachesoftheYangtzeRiverobviouslyshrank.Intheeasternmonsoonregion,theareaswitheitherincreasingordecreasingtrendsreducedforthelasttwodecades;④ Significantincreasesinannualamountandfrequencyofrainstorms,318mm/10aand003d/10arespectively,havebeenobservedforthepast60years,thoughtheintensityofrainstormsremainedunchanged.TheincreasemostlyappearedinthePearlRiverbasinandtheriversofsoutheasternregion.TheHaiheRiverandtheriversofSouthwestChinawitnessedaremarkabledecreaseinannualamount,frequencyandintensityofrainstorms;⑤ Proportionsofthestationswithincrease(decrease)annualmaximum1d,continuousmaximum3dandcontinuousmaximum 5dprecipitationwere592% (408%),544% (456%)and515%(485%)respectively,andthosewithstatisticallysignificantincrease(decrease)are51% (12%),42%(25%)and37%(28%)respectively,indicatinganincreasingfrequencyandintensityofextremeintenseprecipitationevents,andatendencytowardshorterdurationforsingleextremeintenseprecipitationevents.
Keywords:precipitation;intenseprecipitation;rainstorm;trend;climatechange;mainlandChina
ThestudyisfinanciallysupportedbytheNationalNonProfitResearchProgramofChina(NoGYHY201206012).