Doppler lidar measurements at Mace Head

No Doppler lidar data available

Carrier-to-noise ratio (CNR) at line-of-sight measurement pointing to zenith.

No Doppler lidar data available

Vertical wind speed (radial wind at line-of-sight measurement pointing to zenith).
positive = updrafts; negative = downdrafts

No wind speed information available

Horizontal wind speed.

No wind direction information available

Wind from direction: 0 and 360 degrees = North (wind coming from North).

No low level jet detection available

Horizontal wind speed (at 15 degrees elevation) and height of low level jet.
Low level jet detection by M. Tuononen from FMI (Finnish Meteorological Institute).

The Doppler lidar at Mace Head is a WindCube 200S (manufacturer Leosphere). It emits at 1.54 µm and measures the intensity of backscattered light as well as the Doppler shift of the detected radiation. From the deviation of the detected wavelength from the emitted one, profiles of the radial wind can be determined. Subsequently, the radial wind is converted into profiles of the three wind components.

The horizontal wind speed and the wind direction are derived using a least squares fit of the radial wind. The goodness of the fit is influenced by clouds and wind velocity. This may cause gaps in the plots, where quality screening removed invalid fit results.

The wind measurements depend on the presence of scatterers in form of cloud droplets or aerosol particles. The lidar therefore is also suited for the detection of aerosol layers, like volcanic ash plumes. The WindCube is a scanning lidar and therefore does not only produce one vertical profile, but can also be used to monitor the horizontal distribution of aerosols and clouds.

The pictures shown here are updated every hour. Data are not quality assured.

Remote Sensing at Mace Head

The Remote Sensing Division of the Mace Head Atmospheric Research Station is run by the Centre for Climate & Air Pollution Studies (C-CAPS) at NUI Galway and supported by Irish Environmental Protection Agency (EPA), Irish Aviation Authority (IAA), and Science Foundation Ireland (SFI).