Page 44 - 《水资源与水工程学报》2023年第1期
P. 44
!34 " ! 1 # & ' ( ) & * + , - Vol.34No.1
2023 $ 2 % JournalofWaterResources&WaterEngineering Feb.,2023
DOI:10.11705/j.issn.1672-643X.2023.01.05
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FGHIJ:P426.6 KLMNO:A KPQJ:1672643X(2023)01004010
Responseofextremeprecipitationtolocalaverage
temperatureintheYangtzeRiverBasin
1,2
1,2
1,2
JIANGYan ,HEXinguang ,ZHANGXinping
(1.SchoolofGeographicalSciences,HunanNormalUniversity,Changsha410081,China;2.KeyLaboratoryof
GeospatialBigDataMiningandApplication ,HunanProvince,Changsha410081,China)
Abstract:Studyingthenonstationarityofextremeprecipitationanditsresponsetotemperaturecanhelp
thefightagainstthenegativeeffectsfromrainfallrelatedhazards.Basedonthegriddatasetofdailypre
cipitationandtemperatureovertheYangtzeRiverBasinfrom1961to2020 ,thegeneralizedextremevalue
modelsareestablishedtoconfirmwhethertheprevious0day (T )andtheprevious9day(T )local
0 1-9
averagetemperatureswouldcausenonstationarityinextremeprecipitation.Thentheresponsesofextreme
precipitationtoT andT areinvestigatedbyequalsamplebinningmethod,piecewiselinearregression
1-9
0
andexponentialregression.Theresultsshowedthattheextremeprecipitationwasnonstationaryat
99.7% ofthegridsofthebasin ,T andT inducednonstationarityinextremeprecipitationat74.4%
0 1-9
ofthegrids,andT hadagreaterimpactonextremeprecipitationthanT.Extremeprecipitationintensi
1-9 0
tyincreasedatlowtemperaturebutdecreasedathightemperature(peakstructure)withtheriseofT in
0
thebasin.Besides,therewasanobviousdividinglineattheeasternmarginoftheTibetanPlateau,and
thepeakpointtemperaturewashigher (about24℃)intheeastbutlower(about9℃)inthewestof
thisline.Meanwhile,thescalingrateofextremeprecipitationwithT rangefrom -12.3%/℃ to
0
53.6%/℃ andshoweda“superCC,CClikeandsubCCscaling”patternfromSichuanBasincenterto
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