Definition of variables
| Variables | Measuring Device Material | Unit | Description |
|---|---|---|---|
Wind speed (average on 20 min)
|
AANDERAA AWS 2700 (2740) | m/s |
Average wind speed during 20 min. |
Wind gust on 20 min
|
AANDERAA AWS 2700 (2740) | m/s |
Maximum wind speed over a 2-second period at any time during 20 min |
Wind direction |
AANDERAA AWS 2700 (3590) | ° |
φMET is the METEOROLOGICAL WIND DIRECTION - Wind direction - "where it comes from"and "counting clockwise from the North" |
u = Wind speed X component |
AANDERAA AWS 2700 (3455) | m/s |
u is the ZONAL VELOCITY, i.e. the component of the horizontal wind TOWARDS EAST. |
v = Wind speed Y component |
AANDERAA AWS 2700 (3455) | m/s |
v is the MERIDIONAL VELOCITY, i.e. the component of the horizontal wind TOWARDS NORTH. |
Air temperature |
AANDERAA AWS 2700 (3455) | °C |
Air temperature in Celsius degree |
Air relative humidity |
AANDERAA AWS 2700 (3445) | % |
The amount of water vapor in the air, compared to the amount the air could hold if it was totally saturated. |
Atmospherical pressure |
AANDERAA AWS 2700 (2810) | mb or hPa |
Atmospherique pressure reduced to sea level obtained by adding 20 mb at the measure taken at the station level (+/- 163 m) |
Solar radiation |
AANDERAA AWS 2700 (2770) | W/m² |
Direct and scattered solar radiation, as well as thermal radiation from the earth and the atmosphere (300 nm - 60 000 nm) |
More info is available at http://mst.nerc.ac.uk/wind_vect_convs.html or in the frame below.