64
Chapter 4: The Instrumental Data Record
Figure 4.5: Standardised regional (annual) precipitation anomaly time series
for the Sahel regions (100-15° N, 200W-35° E). Two reference periods 1931-60
and 1961-90 are used for comparison of the results.
2
0
>. -1
'0
E
0
c
0
-2
'0
v
C/I
'i5 -,3
....
0
'0
c
0
2
...
C/I
C
0
v
::::li
0
-1
-2
-,3
1860
1900
19
Sohel (10-1S·N). 1900-1992
With resp.et to 1931-60 rn.on
Sohel (10-1S·N). 1900-1992
With resp.et to 1961-90 rn.an
- - srnoothed volutlS
1860
1880
1900
1920
1960
1980 2000
1940
1960
1980 2000
Chapter 4: The Instrumental Data Record
Figure 4.5: Standardised regional (annual) precipitation anomaly time series
for the Sahel regions (100-15° N, 200W-35° E). Two reference periods 1931-60
and 1961-90 are used for comparison of the results.
2
0
>. -1
'0
E
0
c
0
-2
'0
v
C/I
'i5 -,3
....
0
'0
c
0
2
...
C/I
C
0
v
::::li
0
-1
-2
-,3
1860
1900
19
Sohel (10-1S·N). 1900-1992
With resp.et to 1931-60 rn.on
Sohel (10-1S·N). 1900-1992
With resp.et to 1961-90 rn.an
- - srnoothed volutlS
1860
1880
1900
1920
1960
1980 2000
1940
1960
1980 2000