100
APPENDIX.
FOGS ON THE COAST OF CHINA,
BY
F. G. FIGG.
The occurrence of fog on the China coast has been investigated from observations made at the Treaty Ports and lighthouse stations along the coast during the five years 1901 to 1905 inclusive.
•
The following table shows the mean percentage of days in each month when fog was noted at the various stations for the five years nained, Whenever a station recorded fog at any period of the day it has been counted as a day of fog occurrence at that station.
The stations are arranged in the table according to latitude, Hoihow being the most southern and Taku the most northern.
Table I.
Mean Percentage of Doys in each Month when Fog was noted at various Stations along the China
Coast during the five Years 1901-1905, inclusive.
Month.
Hoihow.
Hongkong.
Breaker It.
Pakboi.
I amocks.
Chapel Island.
Swetow.
Turuabonf,
Amoy.
Ocksen.
Middle Dog,
Foochow
Pei-yu-shan.
Wenchow.
Ningpo.
Steep Isd.
Gutzlaff.
North Saddle.
Shaweishan.
Woosung.
SE Shantung Promy.
NE Shantung Promy.
Chefoo.
Howki.
Taku.
January,
17
6! 19
5:11
510
February,
9
13 G 6
4 5
19 17
5
א
G
Mareb,
18
8 | 23 | 21 | 27
April,
7
723 8 27 32 32
1|21| 20 | |89|13|46| 16 53 54 55
May,
0 6 10 27
228 7 40 41.37
1:: tNg=
16
*
&
GU
14 15 12 15
C + 63634 34 26 1110113
755 41 35 31 1112119
7
65
48
248 36 43 31
7 23 32
June....
9115
U
10
13 15 17
37
3431 36 | 24
3 32 41
July,
0
August,.
3
September,..
0
October,
November..
December,
12
RHODON
3
5 12
1 15
228 12 15
3 31 48
3
11
6
2
0 0 0 0
3
3
3
+
3 3
Mean Monthly......................
A 210
12 3 11
4 14 15 16 1
5 20
5 | 21 | 16 | 16 | 12
610 16
12 3
It will be noticed that the ports record much less fog than the lighthouse stations in their respective neighbourhoods. But it must be remarked that observations are usually recorded every six hours at the ports whereas they are made every three hours at the light- houses. Nevertheless it would appear that much more fog is found a few miles seaward of the river mouths than at the ports on rivers a little inland. For instance taking the three ports. Swatow, Amoy and Foochow, we find that the mean monthly percentage for the year is 2.5 whereas grouping Lamocks, Chapel Island, Ocksen, Turnabout and Middle Dog results, we obtain a mean annual percentage of 13.5. We get almost the same result if we compare Chefoo with the Shantung Promontory and Howki lighthouses, but the difference is not so great when Ningpo and Woosung are compared with the adjacent lighthouse stations
When the mean percentage of the whole of the stations is taken, April proves to be the foggiest month, 25 per cent. of the days being foggy, and September has the least fog, viz., 1
per cent.
But the time of the occurrence of the maximum varies with the lavitude, the S. coast recording the maximuin in March, and Shantung and the Gulf of l'echili between June and July. To show this, the time of maximum and the annual. variation generally, it is convenient to arrange the stations in groups for the different parts of the coast. This has been done and the resulting figures are given in the following table. To represent the S. coast the mean of the results at the stations, Hoihow, l'akhoi, Hongkong and Breaker Point have been taken, those from Lainocks to Wenchow inclusive to embrace the Formosa Channel area, those from Pei-yu-shan (Hieshans) to Woosung inclusive as representing the Chusan Archipelago and the estuary of the Yangtze, and the remainder to include the Shantung Promontory and the Gulf of Pechili.