Geography Reference
In-Depth Information
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Fig. 7.19 Effects of future grassland degradation on average annual precipitation between year
2010 and 2020 (measured in millimeters) in Mongolia
40 mm in the northwestern and eastern parts of Mongolia (Fig.
7.19
) and decrease
by over 20 mm in the central part of Mongolia. Totally, the degradation of
grassland will make the annual domain-averaged precipitation decrease by 25 mm.
In the future, the annual average precipitation will decrease by 15-50 mm
during 2040-2050 caused by grassland degradation in most parts of Mongolia.
Simulation results show that there is a downward tendency of annual average
precipitation from the outside to the central areas, and the minimum average
annual precipitation is 15 mm (Fig.
7.20
). The annual average precipitation
decreases obviously in the northwestern and eastern parts of Mongolia, while this
change in the central part is relatively small. This result also illustrates that the
precipitation variance is strongly related to the grassland degradation.
7.4.2.3 Effects on the Monthly Average Temperature and Precipitation
The impacts of grassland degradation on the monthly average temperature vary
from month to month during 2010-2020 and 2040-2050 (Fig.
7.21
). The simulated
result indicates that the monthly average temperature in the above two periods are
much similar and have obvious seasonal characteristics. Specifically, grassland
degradation has a significant impact on the monthly temperature in Mongolia, the
change scale of monthly average temperature are 0.025-0.075 C. Compared with
the results of control test, the monthly average temperature increases continuously,
and the growth rate increases first and then decreases. The maximum change of
monthly average temperature appears in July with 0.075 C, while the minimum
