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1、2932011M5luj1.0的湿润气候区和降水量大于700 mm的区域分布基本一致,湿润指数小于0.5的区域大于降水量小于400 mm的区域,湿润指数在半干旱气候区变异系数较大,为25%36%,半湿润和湿润气候区的变异系数较小;标准差的分布与变异系数有相反的趋势。半干旱半湿润和湿润半湿润分界线倾向于东北西南走向,但各年代界线摆动幅度较大,出现整体移动趋势。以1960年代界线为变化基准线,1980年代向西移,20012007年代的变化幅度最大,向东南移动明显,半干旱区扩大,湿润区缩小,东北地区有逐渐变干的趋势,进一步说明气候变干的进程加快,干旱范围扩大,程度加强。1oM:湿润指数;干湿界线;变
2、化特征;东北地区ms|:S162.3DSM:AcI|:1000-7601(2011)03-0226-07uou,1!j800 1.0AuHumidregion2Ts2.1uM(IbWs#Ms2.1.1东北地区多年参考蒸散量的空间分布Vm1VA,uMI(v5001100mmWM,uWsv,2_vhlt。usv2,usC。2m3,+Yu,Ml,I1000mm,IKvu。CIKlu,B600 mm/,v8001000mm,uv600700mm。2273f:uA#ALM+m119612007MMI(M9sFig.1Distribution of mean annual referenceevapotr
3、anspiration in Northeast Chinafrom 1961 2007m2uMIMMMM,Vm2VAuMI/t,10 ah4.4mm,V20W60M90MI/tA,10 ah15.8 mm,2000MA6,10a9F111mm。19611983MM9I47a(,19832000M47a(,2000M47a(,1993M9,2000M6,2007M90。2.1.2东北地区年参考蒸散量变化趋势的空间分布,uM(I98/t,uMtM(m3)。d9TV,47auM(I64%_/t,36%_6t,8%_6tA,18%_/tA,_tA,VIAM。9?C,au_qK,Vr2036 mm/1
4、0a,/t9KA。7v2I6tA,9B1520 mm/10a。m21961 2007MuM9I(a)#(b)MwLFig.2Temporal evolution of the average annual reference evapotranspirationin Northeast China and its accumulativeanomaly from 196120072.2Asum447 a(AAsm。A1.0Auv700mmusB,1sa;A0.51.0WAu,1sC、vav;Al0.5lu1s,suvl400mmu,NAlAuNAi,A228luj1.0Auv700mmusB,
5、1sa,AANZ4Bt。3)uAluMsv,25%36%,AAuMsl;SsMsMQt。A98/t,Mt?3lAu#Auvsu,A_qMvM,BMFy,lFo,S.V45MSAuM+J.lu,2007,31(1):715.10L,.Sd3bW/(I):/bW/oJ.1,2004,19(5):679687.11),T,f.IT9ZE#NJ.2j,.u$soMuYJ.S,2003,23(5):564570.Change characteristics of humid index and dry/wet climateboundary in Northeast ChinaZHANG Shu-jie
6、1, ZHANG Yu-shu1, CHEN Peng-shi2, CAI Fu1, WU Jin-wen1, JI Rui-peng1(1.Institute of Atmospheric Environment, China Meteorological Administration, Shenyang, Liaoning 110016, China;2.Liaoning Meteorological Bureau, Shenyang, Liaoning 110001, China)Abstract:Using basicdaily data of 124weather stations
7、from19612007, basedon Penman-Monteithmethod,reference evapotranspiration(RE)andHI are calculated aswell as theirs trends and changes of borderlineinthewet anddry climate zone are studied.The results show that RE rangesfrom 5001000mmandis distributedwith largevalueinthe southwesternpart and small val
8、ue inthe northeasternpart of Northeast China.Annual REwhichis decreasing espe-cially from 1960s1990s and increasing significantly after 2000, demonstrates uptrend in 1/3 zone and downtrend in2/3 zone interms of spatial distribution.Humid climatic regionwhereHI is larger than 1.0 is basically consist
9、ent withwhere precipitation is greaterthan700mm.The areaof regionwhereHI is smallerthan0.5is largerthanwhere precipi-tation is less than400mm.The coefficient of variationof HIwithrangefrom 25%36%is largerin semi-arid climaticregion and is smallerinsemi-humidandhumidclimaticregion.Withdecreasingin th
10、emassHI, semi-arid, semi-humidandthegreat mass humid climatic regionswhere positive amplitude of variation of climate tendency of HI is larger thanthe negative are running dry.The boundary between semi-arid/semi-humid andhumid/semi-humidrunns from northeastto southwest swingswildly and shows a trendof monolithic translation.At the basic lineof 1960s boundary, the 1980sboundary move westward and the boundary
