![]() ![]() ![]() While the automated surface observing systems (ASOS) ceilometer at the Logan airport provides only the overhead cloud information, the proposed algorithm provides this information over the valley. In the proposed research, observations (fog which yields a zero cloud base height and satellite cloud imaging data) will be used throughout the year to confirm the validity of computed data. In consideration of theĪdditional longwave radiation during cloudy skies coming from the cloud in the waveband of 8-13 mm which the gaseous emission lacks, an algorithm was developed which provides continuous 20-min cloud information (cloud base height, cloud base temperature, percent of skies covered by cloud) over the area during day and night (Malek, 1997). Using air temperature and moisture and measured downward longwave (atmospheric) radiation, an appropriate formula (among four approaches) was chosen for computation of cloudless-sky atmospheric radiation. These parameters are measured every 2 seconds and averaged into 20 minutes. Wind speed and direction at three meters, the surface temperature (using an IR thermometer) and precipitation (using a heated rain gauge) are also measured. The 2-m air temperature, humidity, and pressure are measured continuously. The Bowen ratio system is not ventilated. Ventilation of pyranometers and pyrgeometers prevents dew, frost and snow accumulation, which otherwise would disturb the measurement. The pyranometers and pyrgeometers are ventilated using four CV2 Kipp & Zonen ventilation systems. ![]() Pyranometers (one inverted), and two CG1 Kipp & Zonen pyrgeometers (one inverted) to measure radiation components, and the Bowen ratio system measures energy balance components. The radiation station uses two CM21 Kipp & Zonen To study these effects at local scale, a radiation station (Kipp & Zonen) and a Bowen ratio system (Campbell Sci., Inc.) have been installed at the Logan airport. They affect the climate by positive and negative feedback. They make changes in the radiation and energy balances at local, regional, and planetary scales. Clouds are clearly an important and very uncertain component of climate and climate change. (2006) worked on the meteorological and environmental aspects of the worst national air pollution episodes (January 2004) in Logan, Cache Valley, little detailed information exists on the evaluation of annual radiation and energy balances components, and cloudiness and its effects on the microclimate of this valley. Among the weather-related phenomena in this Valley is the wintertime inversion and air pollution. Non Technical Summary The unique microclimate of Cache Valley in northern Utah, USA, is not well understood. ![]()
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