FIGURE 2

The most frequently occurring continental-scale rainfall anomaly types for the twentieth century. (From Nicholson, 1986; reprinted with permission of the American Meteorological Society.) The values represent regionally averaged standardized departures.

TABLE 1 Rainfall Anomalies for the Decade 1980-1989

 

1950-1959 Depart.*

(%)

Stdzd. Depart.

(% s)

1970-1979 Depart.

(%)

Stdzd. Depart.

(% s)

1980-1989 Depart.

(%)

Stdzd. Depart.

(%s)

Northern Sahel

37

54

-31

-47

-24

-35

Central Sahel

28

71

-22

-55

-31

-82

Southern Sahel

15

62

-13

-53

-20

-85

Soudano-Guinean Zone

3

22

-5

-36

-8

-56

Guinea Coast

3

15

-6

-31

-7

-35

Eastern Africa

-2

-9

0

4

2

15

Northern Kalahari

8

28

6

20

-5

-21

Southern Kalahari

7

23

10

34

-7

-27

* Anomalies are expressed as a percentage departure from the long-term mean and as a standardized departure (ratio of the departure from the mean to the standard departure).



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