Historic floods and droughts - Climatic Change in Deserts - page 456

6

F flood year

D drought year
El Niño year

5

D

4

D

D D

3

F DD

2

F D

1

D

F

F

0

F

D D D

F -1

F

-2

F

-3

-4

1900 1910 1920 1930 1940 1950 1960 1970 1980

Figure 23.4. The ENSO index for the 1900-1980 period, with floods and droughts
indicated for northern and central Thailand. (After Godley, 2002 , fig. 12.2.)

0.8

Signifiant at 1% level

0.4

0

Period of tree growth
corresponding to year 0

-0.4

DJF MAM JJA SON DJF MAM JJA SON DJF MAM JJA SON

year -1 year 0- year +1

Figure 23.5. Correlation coefficients for the seasonal SOI against the tree ring index
for Tectona grandis (teak) growing in Java, 1852-1929. (After Murphy and Whetton,
1989 , fig. 3.)