Climate change - Atmosphere, Weather and Climate - page 454

60 60

Northerly Easterly

50 50

40 40

30 30

20 20

10 10

0 0

1900 1920 1940 1960 1980 2000 1900 1920 1940 1960 1980 2000

180 180

Southerly Westerly

160 160

140 140

120
100

120
100

80 80

60 60

40
20

40
20

0 0

1900 1920 1940 1960 1980 2000 1900 1920 1940 1960 1980 2000

60

Northwesterly

50

40

30

20

10

0

1900 1920 1940 1960 1980 2000

180 180

Anticyclonic Cyclonic

160 160

140
120

140
120

100 100

80 80

60 60

40 40

20 20

0 0

1900 1920 1940 1960 1980 2000 1900 1920 1940 1960 1980 2000

Figure 13.13 Annual totals and ten-year moving averages of the frequency (days) of the Lamb-
Jenkinson circulation types over the British Isles, 1961-1999. Note scale changes.
Source: Lamb (1994). Reprinted from the Climate Monitor and from the Climatic Research Unit data with permission of the
University of East Anglia.