By World Meteorological Organization
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Extra info for Guide on Meteorological Observation and Information Distribution Systems at Aerodrome
One conclus ion of the report is that modem laser ceilometers are reliable, measuring cloud height with great consistency and with a high rate of cloud detection. Neverthless, most continue to exhibit deficiencies in some weather conditions, notably precipitation . For low ceilings (0-100 m) or in fog, the ceilometers tend to differ systematically over an order of magnitude, and some report close to their lowest possible height. The visible light ceilometers arc not so sensitive to these two last phenomena.
In addition to the defined fixed reference points, other secondary reference points are available. Temperature on the IPTS is designated "degrees Celsius (OC)". 2 Time constant An aspect of temperature measurement of particular importance on aerodromes is the response time of ther:nometers. Large vertical temperature gradients may exist in the lowest layers of the atmosphere and the air temperature at screen level may fluctuate appreciably within a few seconds. To obtain representative readings for aviation purposes, these rapid fluctuations should be smoothed out.
It utilizes two mercurY thermometers supported and protected by a chrome-pla ted brass case. The thermometer bulbs are guarded by double-walled radiation shields thermally isolated from the main housing by a plastic bushing. Aspiration of the bulbs is accomplished by a fan at the top of the thermometer housing. 2 The sling psychrometer has not been accepted as a standard instrument which is suitable for routine observations at aerodromes. The bulbs are often insufficiently shielded against radiation in order to obtain the required ventilation of the thermometers.
Guide on Meteorological Observation and Information Distribution Systems at Aerodrome by World Meteorological Organization