TURBULENT AND NET RADIATION FLUXES

The Eddy Covariance method uses the turbulent transport theory in the surface layer of the atmosphere, and estimates gas and energy fluxes from the covariance between vertical wind speed and the gas concentration and temperature at a measured height above the surface. With eddy covariance, the exchange of various gases and energy between the atmosphere and the underlying surface can be measured. The installed systems in Heraklion measure latent and sensible heat fluxes, as well as CO2 fluxes. Τhe measurements are representative of a wide area around the sensors (footprint) that are estimated to cover a significant part of the surrounded area.

REAL TIME MEASUREMENTS

HECKOR

The Eddy Covariance system, at Heraklion city centre is equipped with (IRGASON Integrated CO2 / H2O Open-Path Gas Analyser and 3D Sonic Anemometer, Campbell Scientific, Inc, Utah, USA) has been installed on the roof of a high building in the center of Heraklion (Kornarou Square) since October 2016. The sensor is mounted on a 10 meter telescopic mast in order to reach the appropriate height (27 m) over the urban canopy layer and measure a blended, spatially averaged signal. The system is also equipped with a CNR1 Net Radiometer (Kipp & Zonen B.V. Delft) to measure incoming and outgoing shortwave and longwave radiation.

REAL TIME MEASUREMENTS

HECMAS

The Eddy Covariance system, at Mastambas is equipped with (IRGASON Integrated CO2 / H2O Open-Path Gas Analyser and 3D Sonic Anemometer, Campbell Scientific, Inc, Utah, USA) has been installed on the roof of a public elementary school since April 2021. The sensor is mounted on a 17 meter tower in order to reach the appropriate height (24 m) over the urban canopy layer and measure a blended, spatially averaged signal. The system is also equipped with a CNR4 Net Radiometer (Kipp & Zonen B.V. Delft) to measure incoming and outgoing shortwave and longwave radiation and an air temperature and relative humidity probe (Rotronic).