Campbell-scientific UT20 and UT30 Tower-based Weather Stations Manual de usuario descargar pdf (Pagina 15)

UT20 and UT30 Tower-based Weather Stations

Standard measurement heights:

3.0 m ± 0.1 m recommended (AASC)

2.0 m ± 0.1 m, 10.0 m ± 0.5 m optional (AASC)

10.0 m (WMO and EPA)

4.2 Temperature and Relative Humidity

Sensors should be located over an open level area at least 9 m (EPA) in

diameter. The surface should be covered by short grass, or where grass does

not grow, the natural earth surface. Sensors should be located at a distance of

at least four times the height of any nearby obstruction and at least 30 m (EPA)

from large paved areas. Sensors should be protected from thermal radiation,

and adequately ventilated.

Situations to avoid include:

• large industrial heat sources

• rooftops

• steep slopes

• sheltered hollows

• high vegetation

• shaded areas

• swamps

• areas where snow drifts occur

• low places holding standing water after rains

Standard measurement heights:

1.5 m ± 1.0 m (AASC)

1.25 - 2.0 m (WMO)

2.0 m temperature (EPA)

2.0 m and 10.0 m for temperature difference (EPA)

4.3 Precipitation

A rain gage should be sited on level ground that is covered with short grass or

gravel. In open areas, the distance to obstructions should be two to four times

(EPA, AASC) the height of the obstruction.

The height of the opening should be as low as possible, but should be high

enough to avoid splashing from the ground. Wind shields, such as those used

by the National Weather Service, are recommended for open areas.

Collectors should be heated, if necessary, to properly measure frozen

precipitation. The gage must be mounted above the average level of snow

accumulation in areas that experience significant snowfall.

Standard measurement heights:

1.0 m ± 1.0 cm (AASC)

30.0 cm minimum (WMO, EPA)

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Campbell-scientific UT20 and UT30 Tower-based Weather Stations Manual de usuario Pagina 15