Campbell CM10K Specifikace stáhnout pdf (Strana 12)

2.6 Level 2 Siting

Since the requirements of the solar radiation sensor are difficult to meet in many tropical forest

sites, an alternate strategy is proposed here to locate the station based on the siting requirements

of the temperature/RH and precipitation sensors (Table 3). In order to minimize the effects of

wind turbulence and eddies produced by the obstacles located in the vicinity of the sensor, the

temperature/RH sensor should be located at least a distance of 4 H units away from an obstacle

of height H (Figure 3 A). Similarly, the precipitation gauge should be located at least 2 H units

away from an obstacle of height H (Figure 3 B). A process to locate the radiation sensor is

described below.

Figure 3: Siting requirements for a climatic base tower with a temperature/RH sensor (A) and a precipitation gauge

(B). Distances are not shown to scale. In this example, the base tower with the temperature/RH sensor needs to be at

a distance from the trees at least four times their height (4H1). It also needs to be at a distance from the house at

least four times its height (4H2). The precipitation gauge needs to be 1) at least 30 cm from the ground, 2) at least 6

m away from the 3 m base tower, and 3) at a distance from the house twice its height (2H2) away from it. Guidelines

from WMO (2008) and EPA (1995).

2.7 Level 3 Siting

Refer to Figure 4 for a complete workflow describing the process of choosing an appropriate

location for the climate station. It is assumed here that a relatively open area is available at the

site or near it that could be used for installing the climate station.

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Campbell CM10K Specifikace Strana 12