171
Table 4 : Meteorological data of Dunhuang city.(1956 -1980)
Meteorological
factors
Month
Year
1
2
3
4
5
6
7
8
9
10
11
12
Fine days (days)
11.4
7.6
4.4
4.2
5.4
7.0
6.9
11.1
11.7
14.8
11.0
11.4
107.4
Precipitation (mm)
0.8
1.6
1.2
7.9
1.6
4.7
12.1
5.3
1.8
1.0
1.1
0.7
36.8
Relative humidity (%)
50
42
32
32
32
38
43
43
42
41
48
53
41
Temperature (°C)
-9.3
-4.1
4.5
12.4
18.3
22.7
24.7
23.5
17.0
8.7
0.2
-7.0
9.3
Atmospheric pressure (hPa)
894
891
888
885
883
880
878
881
886
891
895
895
887.2
Sand & dust storms Average
Maximum
0.9
1.4
2.8
0.4
2.3
2.3
1.6
1.5
1.0
0.3
0.4
0.8
15.8
4
4
8
6
7
5
5
4
2
2
4
3
30
4 - CONCLUSION
After a careful analysis and comparison of all information material obtained, it has been primarily decided to
set the radiometric calibration test site for satellite sensors at Germo west Gobi and Dabson Salt Lake in
Qinghai Province and Dunhuang Gobi in Gansu Province, both in north western part of China. Further
measurement tests and analysis and a theoretical work is undergoing and developing and the practical
establishment of the site is being planned. The necessary laboratory and field measurement and calibration
equipment is under preparation and collection.