气象与环境学报
氣象與環境學報
기상여배경학보
JOURNAL OF METEOROLOGY AND ENVIRONMENT
2014年
3期
38-45
,共8页
李尚锋%应爽%姚耀显%廉毅
李尚鋒%應爽%姚耀顯%廉毅
리상봉%응상%요요현%렴의
月低温事件%涡动能量%阻塞高压
月低溫事件%渦動能量%阻塞高壓
월저온사건%와동능량%조새고압
Monthly cool summer event%Eddy energy%Blocking high
利用1960-2009年东北地区150个地面测站的逐日气温资料,定义了东北三省夏季月低温事件(简称MCSE),并将其分为5类。结果表明:MCSE发生频率在20世纪60-70年代较高,80年代逐渐减少,90年代显著减少;6月和8月以第Ⅲ类MCSE为主,而7月则为第Ⅱ类;在冷气候背景下,第Ⅱ类MCSE正涡动能量由高纬向中纬度传播,正常背景下由中纬度向高纬度传播,第Ⅲ类则与之相反,暖背景下第Ⅱ类MCSE的能量传播方向与冷背景一样,而第Ⅲ类则先由低纬度向高低纬度传播,然后由高纬度向低纬度传播;在冷背景下第Ⅱ类和第Ⅲ类MCSE,中国东北地区均处于大范围强冷空气带的覆盖下,而正常期气候背景下这两类MCSE的东北冷涡和乌拉尔山阻塞高压(西阻)均较明显,在暖背景下,第Ⅱ类MCSE的贝加尔湖阻塞高压(中阻)、鄂霍次克海阻塞高压(东阻)以及东北冷涡系统均较明显,而第Ⅲ类MCSE的中阻和东北冷涡明显。
利用1960-2009年東北地區150箇地麵測站的逐日氣溫資料,定義瞭東北三省夏季月低溫事件(簡稱MCSE),併將其分為5類。結果錶明:MCSE髮生頻率在20世紀60-70年代較高,80年代逐漸減少,90年代顯著減少;6月和8月以第Ⅲ類MCSE為主,而7月則為第Ⅱ類;在冷氣候揹景下,第Ⅱ類MCSE正渦動能量由高緯嚮中緯度傳播,正常揹景下由中緯度嚮高緯度傳播,第Ⅲ類則與之相反,暖揹景下第Ⅱ類MCSE的能量傳播方嚮與冷揹景一樣,而第Ⅲ類則先由低緯度嚮高低緯度傳播,然後由高緯度嚮低緯度傳播;在冷揹景下第Ⅱ類和第Ⅲ類MCSE,中國東北地區均處于大範圍彊冷空氣帶的覆蓋下,而正常期氣候揹景下這兩類MCSE的東北冷渦和烏拉爾山阻塞高壓(西阻)均較明顯,在暖揹景下,第Ⅱ類MCSE的貝加爾湖阻塞高壓(中阻)、鄂霍次剋海阻塞高壓(東阻)以及東北冷渦繫統均較明顯,而第Ⅲ類MCSE的中阻和東北冷渦明顯。
이용1960-2009년동북지구150개지면측참적축일기온자료,정의료동북삼성하계월저온사건(간칭MCSE),병장기분위5류。결과표명:MCSE발생빈솔재20세기60-70년대교고,80년대축점감소,90년대현저감소;6월화8월이제Ⅲ류MCSE위주,이7월칙위제Ⅱ류;재랭기후배경하,제Ⅱ류MCSE정와동능량유고위향중위도전파,정상배경하유중위도향고위도전파,제Ⅲ류칙여지상반,난배경하제Ⅱ류MCSE적능량전파방향여랭배경일양,이제Ⅲ류칙선유저위도향고저위도전파,연후유고위도향저위도전파;재랭배경하제Ⅱ류화제Ⅲ류MCSE,중국동북지구균처우대범위강랭공기대적복개하,이정상기기후배경하저량류MCSE적동북랭와화오랍이산조새고압(서조)균교명현,재난배경하,제Ⅱ류MCSE적패가이호조새고압(중조)、악곽차극해조새고압(동조)이급동북랭와계통균교명현,이제Ⅲ류MCSE적중조화동북랭와명현。
Based on the daily temperature data from 150 weather stations in the northeast China during 1960-2009, the monthly cool summer event(MCSE)was defined and it was classified into 5 types.The results indicate that the frequency of MCSEs is the highest during 1960s to 1970s,and then reduces gradually afterwards,especially signifi-cantly in 1990s.TheⅢtype MCSE mainly appears in June and August,and theⅡone is in July.The eddy energy of the Ⅱtype MCSE mainly transports from high to middle latitudes under the cold climate background and from middle to high latitudes under the normal climate background respectively,while the reverse is true for theⅢtype MCSE.The transfer direction of the eddy energy under the warming background is the same as that under the cold background for the Ⅱtype MCSE,while that is firstly from lower to upper and then from upper to lower for theⅢtype MCSE.In addition,the strong and cold air belt covers over the northeast China under the cold background for the Ⅱ and Ⅲ type MCSEs,while it is obvious northeast cold vortex and Ural blocking(west blocking)under the normal climate background.Under the warming climatic background,the Baikal Lake blocking high(middle bloc-king),the Okhotsk blocking high(eastern blocking)and cold vortex are all significant for theⅡtype MCSE,while the Baikal Lake blocking high(middle blocking)and cold vortex are obvious for the Ⅲ type MCSE.