station science winter snow methane ch4 research drone aerial atmospheric weather meteorology eddy, snowy frost

station science winter snow methane ch4 research drone aerial atmospheric weather meteorology eddy snowy frost measuring ozone o3 carbon dioxide co2 nitrogen oxides n2o mountain beech fagus europe oxygen 02 water sylvatica european common stitna tower pyranometer sulfur measurement sunshine global change radiation covariance temperature meteorological scientific gas monitoring technology