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C        THIS IS A PROGRAM FOR DETECTING ABRUPT CLIMATIC CHANGE
C        BY USING MANN-KENDALL TECHNIQUE
        PROGRAM MK
        DIMENSION Y(1000),YY(1000),U(1000),UF(1000),UB(1000),
     &        M(1000),MD(1000),X1(1000),X2(1000),X3(1000)
        WRITE(*,10)
  10        FORMAT(2X,'N=?,NYEAR=?')
        READ(*,*)N,NYEAR
C        ***************************************************
C        * N:     SAMPLE SIZE                              *
C        * NYEAR: FIRST YEAR OF THE TIME SERIES            *
C        * Y(N):  ORIGINAL TIME SERIES                     *
C        * UF(N): ORIGINAL SERIES OF U(LN)                 *
C        * UB(N): COUNTER SERIES OF U(LN)                  *
C        * A,B:   CRITICAL VALUE 1.96 AND -1.96            *
C        ***************************************************          
        OPEN(2,FILE='D:\fortran\xxbb\MK1.txt')
        READ(2,*) X1(I),X2(I),X3(I)
        DO 60 I=1,N
  60        Y(I)=(X1(I)+X2(I)+X3(I))/3
        CALL SMK(Y,M,MD,UF,N)
        DO 20 I=1,N
  20        YY(I)=Y(N+1-I)
        CALL SMK(YY,M,MD,U,N)
        DO 30 I=1,N
  30        UB(I)=-U(N+1-I)
        OPEN(3,FILE='D:\fortran\xxbb\mk2.txt',STATUS='NEW')
        A=1.96
        B=-1.96
        DO 40 I=1,N
        WRITE(3,50)NYEAR+I-1,Y(I),UF(I),UB(I),A,B
  50        FORMAT(1X,I4,4F8.2)
  40        CONTINUE
        CLOSE(3)
        STOP
        END
C***********************************************************
        SUBROUTINE SMK(Y,M,MD,U,N)
        DIMENSION Y(N),M(N),MD(N),U(N)
        M(1)=0
        DO 10 I=2,N
        M(I)=0
        MD(I)=0
        DO 20 J=1,I-1
        !IF(Y(I).LT.Y(J))GOTO 20         !GEÊÇ>=£¬GTÊÇ>£¬LEÊÇ<=,LTÊÇ<
        IF(Y(I).LE.Y(J))GOTO 20
        M(I)=M(I)+1
  20        CONTINUE
        MD(I)=MD(I-1)+M(I)
  10        CONTINUE
        U(1)=0.0
        DO 30 I=2,N
        E=I*(I-1)/4.00
        VAR=I*(I-1)*(2*I+5)/72.00
        U(I)=(MD(I)-E)/SQRT(VAR)
  30        CONTINUE
        RETURN
        END

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