Geoscience Reference
In-Depth Information
Fig. 3 Changes in average seasonal surface temperature (DT) in degrees Celsius for the Mahanadi River
Basin (MRB) and the Aral region including the Aral Sea Drainage Basin and the Aral Sea. a The change
from 1901-1955 to 1956-2000 for the Wet Season in MRB. b The change from 1901-1955 to 1956-2000
for the Dry Season in MRB. c The change from 1901-1950 to 1983-2002 for the growing season in the Aral
region. d The change from 1901-1950 to 1983-2002 for non-growing season in the Aral region. All these
seasonal temperature changes (DT) are significant at least at the confidence level p = 0.999 (see
Appendix
,
Table 3). Source Mitchell and Jones (
2005
)
annual average T change (of 0.26 C), we can quantify different DT components by
expressing the seasonal T changes as follows:
DT
WS
¼
DT
cl
þ
DT
WS
irr
ð
1
Þ
DT
DS
¼
DT
cl
þ
DT
DS
irr
ð
2
Þ
where DT
WS-irr
and DT
DS-irr
are the T change components due to the irrigation in the Wet
Season and the Dry Season, respectively; these are and should be different to reflect
different cooling due to the difference in the amount of water used for irrigation between
the two seasons. Furthermore, DT
cl
is the T change component due to the regional man-
ifestation of global climate change. As assumed by Destouni et al. (
2010
) for the Aral
region, the seasonality of the latter, climate change component DT
cl
can also in the MRB
be assumed to be relatively small (i.e., the change of T assumed to be more or less similar
even if T itself differs between different seasons), compared to the seasonality of T change
due to irrigation, which differs between the Wet Season and the Dry Season. With a DT
cl
component that is relatively similar between the Wet Season and Dry Season, subtraction
of Eq. (
2
) from Eq. (
1
) yields:
