Abstract
Temperature measurements of InterMET Inc. aluminum-coated iMET-XQ sensors were tested in an outdoor setting under a variety of solar radiation and wind speed conditions. Twelve unshielded sensors were mounted side-by-side on the tower of a South Alabama Mesonet weather station next to a reference sensor on the tower. The iMET-XQ temperatures were most precise and accurate in solar radiation values that were close to zero, regardless of wind speed. Under overcast conditions, wind speeds of 2 m s−1 were sufficient to obtain precise and accurate temperature measurements. During the day-time, aspiration of wind speeds higher than or equal to 3 m s−1 is sufficient. An iMET-XQ was placed in a radiation shield next to the tower reference sensor to test the need for a radiation shield. A second iMET-XQ was placed unshielded on the tower. The iMET-XQ sensors with aluminum coating do not need to be shielded, but they do need to be aspirated. It is recommended that, when taking temperature measurements using unmanned aerial vehicles (UAV) with iMET-XQ sensors, the UAV either fly at 3 m s−1, be embedded in winds of those speeds, or to use the propeller wash of the UAV to aspirate the sensors.
Highlights
By providing sources of energy, the atmospheric boundary layer (ABL) plays a major role in the development of many meteorological phenomena, including convective initiation and tornado-genesis [1]
Each of the absolute temperature difference (ATD) (TD) values for all daytime experiments are assigned to a 2 m wind speed bin to quantify the improved precision of the iMET-XQ temperature measurements as the wind speed increases (Figure 5), and to define an optimal wind speed threshold above which precision and accuracy are at an acceptable level
Conclusions iMET-XQ temperature precision and accuracy was assessed in outdoor conditions, while the sensors were mounted on an instrumented tower under a range of solar radiation and wind speed conditions
Summary
By providing sources of energy, the atmospheric boundary layer (ABL) plays a major role in the development of many meteorological phenomena, including convective initiation and tornado-genesis [1]. [6], chamber experiments to assess the bias (accuracy) and precision of iMET-XF PT 100 thermistors were conducted, as well as the effects from using aspirated shields. It was concluded that the iMET-XQ temperature measurements were within the manufacturer specified accuracy of a NIST-traceable standard [2]. In the past, only one experiment was conducted with iMET-XQ sensors in a stationary location on an instrumented tower [2] This experiment involved only iMET-XQ sensors in a radiation shield and results from varying weather conditions were not addressed. Aluminum coated iMET-XQ sensors were used to address their accuracy and precision in a stationary position on an instrumented tower, while being subjected to varying weather conditions. Past studies have confirmed that radiation shields may warm under sunny conditions [6,11], the aluminum coating may be a good alternative
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