Geography Reference
In-Depth Information
Fig. 7.29 Effects of future
urban expansion on average
monthly precipitation in
urban area in the Northeast
megalopolis, USA (mm)
2010−2020
2040−2050
2090− 2 10 0
Panel (a)
1
2
3
4
5
6
7
8
9
10
11
12
Month
Pane l ( b )
1
2
3
4
5
6
7
8
9
10
11
12
Month
7.5.2.4 Average Monthly Precipitation Effects
There will be slightly negative effects of future urban expansion on average
monthly precipitation in original urban area. Similarly with average monthly
temperature, the change of average monthly precipitation in original urban area
caused by future urban expansion will be more significant in summer than that in
winter (Fig. 7.29 , Panel A). The average monthly precipitation will decrease
in original urban area and reach its maximum of 0.49 mm, 0.69 mm, and 0.71 mm
in July in the period of 2010-2020, 2040-2050, and 2090-2100, respectively, and
it will fall to its minimum of 0.04 mm in December in the period of 2010-2020,
and 0.02 and 0.01 mm in January in the period of 2040-2050 and 2090-2100,
respectively. The effects of future urban expansion on average monthly precipi-
tation will continuously increase from January to July, and then start to decline
until December. This change of average monthly precipitation in original urban
area may be driven by the local circulation change caused by surface energy
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