158
NOTES AND QUERIES
minimum temperatures are appreciably lower than at the Royal Observatory.
During the period 31 October—1 November 1975 measurements of some environmental parameters were made in the vicinity of Stop B, and at Shek Kong near the foot of the mountain (altitude about 100 metres); the results may be summarized as follows:
Shek Kong Tai Mo Shan Max Min Range Max Min Range Temp. 1 m. above surface: °C 22.8 11.9 10.9 27.7 11.8 15.9In addition, at 1 metre above ground level a temperature equal to or above 20 °C was maintained for 4 hours out of 24 at Tai Mo Shan compared with 8 hours out of 24 at Shek Kong.
In summary, the weather conditions on the upper slopes of Tai Mo Shan differ markedly from those close to sea level. The rainfall is much higher. The temperatures (both maximum and minimum) are lower than at Shek Kong, but the diurnal and annual range is narrower; occasionally temperatures below freezing point are recorded at Tai Mo Shan. The diurnal range of relative humidity is also narrower. However, the windspeed is higher at Tai Mo Shan and winds are more sustained on the day of measurement there was a comparatively light wind.
Geology and Soils:
According to the older accounts, the mountain is composed of a rock named Tai Mo Shan porphyry (Davis, 1952). A porphyry is an igneous rock which has solidified from the molten mass at moderate depth and rate so that the crystals composing it are of medium size (about 1.5 mm diameter). However, the most recent treatment of the geology of Hong Kong (Allen and Stephens, 1971) states that the mountain is made up entirely of volcanic rocks, i.e.
158
NOTES AND QUERIES
minimum temperatures are appreciably lower than at the Royal Observatory.
During the period 31 October—1 November 1975 measurements of some environmental parameters were made in the vicinity of Stop B, and at Shek Kong near the foot of the mountain (altitude about 100 metres); the results may be summarized as follows:
Shek Kong
Tai Mo Shan
Max Min Range
Max Min Range
Temp. 1 m. above surface: °C
22.8 11.9
10.9
Temp. at surface: °C
27.1 10.8
15.3
27.7 11.8 15.9 33.7 11.5
22.2
Rel. humidity 1 m.
above surface: %
88.5 46.0
42.5
92.0 30.4
61.6
Rel. humidity at
surface: %
96.0 34.0 62.0
95.8 22.0 73.8
Wind speed: metres
per sec.
3.2 0.5
2.5 0.1
In addition, at 1 metre above ground level a temperature equal to or above 20 °C was maintained for 4 hours out of 24 at Tai Mo Shan compared with 8 hours out of 24 at Shek Kong.
In summary, the weather conditions on the upper slopes of Tai Mo Shan differ markedly from those close to sea level. The rainfall is much higher. The temperatures (both maximum and minimum) are lower than at Shek Kong, but the diurnal and annual range is narrower; occasionally temperatures below freezing point are recorded at Tai Mo Shan. The diurnal range of relative humi- dity is also narrower. However, the windspeed is higher at Tai Mo Shan and winds are more sustained on the day of measurement there was a comparatively light wind.
Geology and Soils:
According to the older accounts, the mountain is composed of a rock named Tai Mo Shan porphyry (Davis, 1952). A porphyry is an igneous rock which has solidified from the molten mass at moderate depth and rate so that the crystals composing it are of medium size (about 1.5 mm diameter). However, the most recent treatment of the geology of Hong Kong (Allen and Stephens, 1971) states that the mountain is made up entirely of volcanic rocks, ie
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