Geography Reference
In-Depth Information
(a)
0.40
0.20
0.00
-0.20
-0.40
-0.60
10to2 10to3 11to3 13to3 15to3 19to3
2to3
5to2
5to3
6to3
8to3
-0.25 -0.15
-0.07
0.31
0.21 -0.40 -0.32 -0.32 -0.17 -0.04 -0.33
(b)
0.20
0.15
0.10
0.05
0.00
10to2 10to3 11to3 13to3 15to3 19to3
2to3
5to2
5to3
6to3
8to3
0.10 0.07 0.08 0.17 0.13 0.07 0.06 0.06 0.07 0.07 0.09
2:
3:
5:
6:
8:
10:
11:
13:
15:
19:
Savanna
Deciduous broadleaf forest
Evergreen broadleaf forest
Mixed forest
Barren or sparsely vegetated
Dryland cropland and pasture
Irrigated cropland and pasture
Cropland/grassland mosaic
Cropland/woodland mosaic
Shrubland
Fig. 7.4 Change of the monthly average temperature of different types of LUCC in the future
reclamation of cultivated land in summer (a) and winter (b). Note: i to j (i, j are codes of land use/
cover types) refers to the conversion from the land use/cover of i to that of j
in some areas near the Himalayas Mountain. Generally from the Fig.
7.3
, we can
also conclude that the impacts of land reclamation will not only be exerted on the
local climate but also transmitted to neighboring areas.
(ii)
Relationship between Land Use and Cover Change (LUCC) and the changes
of near-surface temperature
The results show that the changes from evergreen broadleaf forest to irrigated
cropland and pasture (designated as the conversion of 13-3 for convenience, the
same below) or the changes from mixed forest to irrigated cropland and pasture
(15-3) will cause an increase on the monthly average temperature separately by
0.31 and 0.21 C in summer (Fig.
7.4
a). These two types of land conversion will
induce the decrease on latent heat flux and increase on sensible heat flux, leading
to an overall increase on land surface temperature. The warming effect caused by
the deforestation will not be offset by the cooling effect of cropland irrigation in
this case. In addition to these two types of cultivated land reclamation, other land
