286
30
25
0'
i:........ 20
Q)
'::::l
"§
Q) 15
Q.
E
Q)
..... 10
5
03
06
09
12
15
F. Gottsche, F.-S. Olesen
o continuous urban fabric, Milano
o non-irrigated arable land, Po-Valley
+ broad-leaved forest, Apennines
18
21
24
03
06
solar time [hours]
Fig. 3. Examples of modelled diurnal temperature waves for 3 different surfaces as described in
Table 3
Table 3. The parameters determined for the 3 temperature cycles shown in Figure 3
Parameter
Continuous urban Non-irrigated
Broad-leaved
fabric
arable land
forest
To
['C]
6.6 ±0.6
3.7 ± 0.5
3.9 ± 0.6
Ta
['C]
20.8 ± 0.7
22.9 ± 0.7
18.0 ± 0.8
w
[hh:mm]
13:56
13:54
13:53
tm
[solar time]
12:53 ± 00:04
12:39 ± 00:03
12: 13 ± 00:04
ts
[solar time]
17:07 ± 00:18
17:04 ± 00: 15
17:02 ± 00:22
k
[hh:mm]
03:21
02:38
01:44
dT
[C]
-0.8 ± 0.7
0.9 ± 0.6
2.0 ± 0.6
leaved forest.
In a further step the method was applied to the vegetation period of 1996 for a
data set that covers the northern Sahara as well as vegetated areas in Germany up
to the Danish border. In tests on these data it turned out that the fitting of all 7
parameters fails in situations with too few cloud-free slots. Thus, the following