Meteorological Instrument Performance Characteristics

General Characteristics of Measurements » Representativeness

According to CIMO (2008), the representativeness of an observation is defined as the degree to which it accurately describes the value of the variable needed for a specific purpose. It is not a fixed quality of any observation but results from joint appraisal of instrumentation, measurement interval, and exposure as these characteristics relate to the requirements of a particular application. Measurements taken at a site will always contain a degree of influence from some upstream area and will be affected by natural variables such as wind speed, turbulence, and diurnal heating and cooling but also by the instrument characteristics such as the volume of sample collected and analyzed. Site selection is paramount to achieving the expected representativeness of the spatial-temporal domain relevant to the study (See Foundations to Meteorological Instrumentation and Measurements for more on Site Selection).

This site was selected for the science objective to make spatial measurements of the velocity and scalar turbulence fields in a uniformly vegetated canopy.