Table 1. Data availability (in percentage) at different stations at different pressure levels,
500 hPa, 150 hPa, pressures at CPT(obtained for each profile), 70 hPa and 50 hPa
normalized to total number of observations for 10 year period (1999-2008). Star
indicates the major data gaps which is discussed in the text. Reported data levels
available (in percentage) in the range ≥5 – 10, ≥10 – 20, ≥20 – 30 and ≥30- 40 between
150-50 hPa at the five stations are also shown.
% of data available up to different
pressure levels
500
hPa
150
hPa
Pressure
at CPT
70
hPa
50
hPa
Truk
(7.44 N,151.83oE)
99
96
95
92
88
% of data level
between150-50 hPa
≥5
≥30≥10 ≥20
40
- 20 - 30
10
0
3 82 13
Rochambeau
(4.83oN, 52.36oW)
99
98
98
91
88
4
75
19
100
99
99
94
91
1
9
64
99
96
96
88
78
5
24
40
100
98
97
88
83
5
27
55
Station
o
Singapore
(1.03oN,103.87oE)
Seychelles
(4.66oS,55.53oE)
Darwin (12.41oS,
130.88oE)
0
23
20
8.2
Number of
observation.
6985
6837
6960
5838*
6964
Table 2. The overall percentage of occurrence of LT, ST, TT, fourth tropopauses, fifth
tropopauses, and AT calculate for different threshold CPH  3 , CPH  4 , CPH  5 and
CPH  6
for the five stations Truk, Rochambeau, Singapore, Seychelles and Darwin for
the period 1999-2008.
CPH  3
Darwin
Seychelles
Singapore
Rochambeau
Truk
CPH  4
Over all % of occurrence for 1999-2008
LT
ST
TT
Fourth Fifth
AT
Tropo. Tropo.
5.01 30.5
1.25
0
0 34.5
5.01
40.8
4.151
0.04
0
44.1
5.01
48
8.807
0.28
0.015
50.9
CPH  6
5.01
53.9
13.78
0.88
0.074
56.6
CPH  3
7.64
30.9
1.281
0
0
36.3
7.64
41
4.625
0.03
0
45.7
7.64
47
9.596
0.33
0
51.1
CPH  6
7.64
50.5
13.94
1.13
0.03
54.4
CPH  3
12.1
49
2.717
0
0
56.7
12.1
63.5
11.46
0.1
0
69.1
12.1
71.8
22.32
1.26
0
76.2
CPH  6
12.1
77.1
33.99
4.29
0.163
80.7
CPH  3
12.1
29.3
1.432
0
0
37.6
12.1
39.3
5.092
0.13
0
46.3
12.1
46.7
11.18
0.8
0
52.7
CPH  6
12.1
51.3
17.13
1.76
0.036
56.6
CPH  3
4.22
22.2
0.786
0
0
25.6
4.22
29.5
2.178
0.03
0
32.5
4.22
37.9
5.188
0.18
0
40.5
4.22
45.2
9.165
0.68
0
47.3
CPH  5
CPH  4
CPH  5
CPH  4
CPH  5
CPH  4
CPH  5
CPH  4
CPH  5
CPH  6