Evaluation of Cloud Feedback at Local Scale: Warming or Cooling?

To evaluate cloudiness and its feedback at local scale, a radiation station was set up, which used two CM21 Kipp & Zonen pyranometers (one inverted), and two CGI Kipp & Zonen pyrgeometers (one inverted) in Logan, Utah, USA The pyranometers and pyrgeometers were ventilated using four CV2 Kipp & Zonen ventilation systems. Ventilation of pyranometers and pyrgeometers prevented dew, frost and snow accumulation, which otherwise would disturb the measurement. All radiation sensors were installed at about 3‐m above the ground. Radiation budget components such as (downward and upward solar radiation, Rsi, Rso, respectively) and downward atmospheric and upward terrestrial (Rli and Rlo, respectively) along with the 2‐m air temperature, humidity, and pressure have been continuously measured since 1996. These parameters have been measured every 2 seconds and averaged into 20 minutes. An algorithm has been developed for evaluation of cloudless‐sky incoming (atmospheric) longwave radiation. Also other equations were ap...