Wind characteristics recorded at the Czech Carbon Observation System (CzeCOS) site Rajec (original) (raw)
2018, EUROPEAN JOURNAL OF ENVIRONMENTAL SCIENCES
The main aim of this study is to investigate general and temporal characteristics of wind speed and direction at Rajec Ecosystem Station (ES), which is part of the Czech Carbon Observation System (CzeCOS) network and located in the Czech-Moravian highlands in the Czech Republic. Four years (2013-2016) of eddy covariance data recorded in a mature monoculture of spruce (Picea abies) was used to build wind roses and analyse the temporal wind characteristics. The prevailing wind directions at Rajec ES were SouthEast and NorthWest and the highland orography in this region does not affect wind flow. Changes in wind direction were recorded each year mainly due to changes in the general atmospheric circulation patterns over Europe. This paper records the occurrence of calm conditions and a threshold of horizontal wind speed (u) of less than 1 m s-1 , was used to define calm periods. The average percentage of calm conditions over 4 years was 6% and when the data was separated into daytime and nighttime occurrence of calm conditions, it was 8% and 4%, respectively.
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