4.1.8. Net Radiation
The distribution net radiation showing on Figure 11 as follows:
Acquisition: 632003 Acquisition: 4182004
Acquisition: 652004
Acquisition: 7232004 Acquisition: 4212005
Acquisition: 7102005
Acquisition: 8112005 Acquisition: 1012006
Legend Wm
-2
Figure 11. Distribution of net radiation Wm
-2
in Karawang district
41
Net radiation is calculated based on position of latitude and time of Julian day. Total net radiation is shown in Table 9.
Table 9. Total net radiation in Karawang district
632003 4182004 652004 7232004 4212005 7102005 8112005 1012006
0-50 50-100
156 100-150
23 40
6,014 7
1,187 121
273 150-200
181 415
6,923 676
7,719 739
658 6
200-250 160,020
2,876 146,872
144,047 34,338
155,413 119,073
257 250-300
11,995 169,079
12,893 28,689
131,469 15,098
52,908 187,332
300-350 1,167
1,035 5,582
350-400 No Data
21,022 19,664
20,382 19,822
17,493 21,871
20,329 63
Total 193,241
193,241 193,241
193,241 193,241
193,241 193,241
193,241 Rn Date
Area ha
In April Karawang district has net radiation between 250-300 Wm
-2
, in May-August 200-250 Wm
-2
and October 250-300 Wm
-2
. In October almost all area receive net radiation around 250-300 Wm
-2
, or 187,000 hectare from total area of Karawang 193000 hectare. Geographically in Karawang district the
influence on amount of the net radiation which reaches the land surface is not significant.
4.1.9. Soil Heat Flux
Soil heat flux distribution is shown in Figure 12. Based on Table 10 it is found that in Karawang district potential energy for soil heating is 30-40 Wm
-2
, except for the data of October 01, 2006 when total energy used to heat soil is
about 40-50 Wm
-2
for areas near water body or fish pond and for water body and fish pond it is about 30-40 Wm
-2
. Table 10. Area of energy for soil heat flux
632003 4182004 652004 7232004 4212005 7102005 8112005 1012006
0-10 445
437 551
496 551
544 501
10 10-20
84 1,784
2 20-30
12,385 333
29,965 47,818
9,181 71,299
1,085 3
30-40 159,389
172,806 142,259
123,321 166,016
99,527 171,327
65,900 40-50
1 127,263
50-60 No Data
21,022 19,664
20,382 19,822
17,493 21,871
20,329 63
Total 193,241
193,241 193,241
193,241 193,241
193,241 193,241
193,241 Soil
Date Area ha
42
Acquisition: 632003 Acquisition: 4182004
Acquisition: 652004
Acquisition: 7232004 Acquisition: 4212005
Acquisition: 7102005
Acquisition: 8112005 Acquisition: 1012006
Legend Wm
-2
Figure 12. Distribution energy for soil heat flux Wm
-2
in Karawang district
4.1.10. Sensible Heat Flux
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