109
Tecnología y Ciencias del Agua
, vol. VIII, núm. 2, marzo-abril de 2017, pp. 105-115
Wang
et al
.,
Research on the hydrologic cycle characteristics using stable isotopes of oxygen and hydrogen in the Jinxiuchuan Basin
ISSN 2007-2422
•
site (Wu
et al
., 2011a y b; Zhai, Wang, & Teng,
2011), as shown in table 1. Summer precipita-
tion is from June to September, and the winter
precipitation is from November through the
following March. April, May, and October are
the major time of transmission for water vapor.
The local evaporation is relatively slow with low
surface temperature, and cannot form effective
precipitation. In order to avoid replication of the
season samples, the precipitation data of these
three months are not used for comparison.
According to the isotope data,
δ
D in atmo-
spheric precipitation is within the limits of
-128.3 to -35.6‰, averaging -79.8‰, while
δ
18
O
range from -17.5‰ to -5.3‰, with the average
of -11.3‰. Comparing the two isotope values,
the change of
δ
18
O is smaller than
δ
D. The
reason is mainly that the fractionation effect of
hydrogen isotope is much better than oxygen
isotope. Zheng, Hou and Ni (1983) reported that
δ
D range from -210‰ to 20‰, and
δ
18
O from
-24‰ to 2.0‰ in precipitation of China. In the
study area, the stable isotopes content belong to
the ranges of China and the global atmospheric
precipitation, and the average values are smaller
than both of them.
The weighted average values of
δ
D and
δ
18
O
in precipitation were obtained by the precipi-
tation-weighted method, to get the seasonal
variation law of the isotope values, as shown in
Figure 2. The monthly rainfall, temperature and relative humidity from 2011.7 to 2012.7.
Table 1. Atmospheric precipitation details in the Jinxiuchuan Basin.
Sampling
points Location Height
(m)
Time Average monthly
Temperature (℃)
Relative
humidity
(%)
Average
monthly
rainfall (m)
Weighted average
value (‰)
d
-excess
(
d
) (‰)
δ
D
δ
18
O
1
117.01°E
127
Summer
26
78
76
-61.5 -8.9
9.7
36.49°N
Winter
1
54
8
-109.3 -15.6
15.5
2
117.17°E
240
Summer
27
82
124.2
-54.4 -7.9
8.8
36.51°N
Winter
2
50
19
-87.8 -12.8
14.6
3
117.22°E
360
Summer
27
86
156.1
-44.9 -6.4
6.3
36.47°N
Winter
2.5
55
26
-92.9 -13.6
15.9
4
117.07°E
285
Summer
26
66
69
-63.1 -9.1
9.7
36.55°N
Winter
0
43
21
-113.8 -16.3
16.6
5
117.11°E
261
Summer
27
74
51
-62.7
-9
9.3
36.42°N
Winter
1
41
2
-116.6 -15.8
9.8
