Journal
TELLUS SERIES B-CHEMICAL AND PHYSICAL METEOROLOGY
Volume 64, Issue -, Pages -Publisher
TAYLOR & FRANCIS LTD
DOI: 10.3402/tellusb.v64i0.18184
Keywords
eddy covariance; urban; energy balance; flux uncertainty; flux error
Categories
Funding
- Academy of Finland Centre of Excellence [1118615]
- Academy of Finland [138328]
- EU
- Tekes
- Academy of Finland (AKA) [138328, 138328] Funding Source: Academy of Finland (AKA)
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Eddy covariance (EC) measurements of turbulent fluxes of momentum, sensible heat and latent heat - in addition to net radiation measurements - were conducted for three consecutive years in an urban environment: Helsinki, Finland. The aims were to: (1) quantify the detection limit and random uncertainty of turbulent fluxes, (2) assess the systematic error caused by EC calculation-procedure choices on the energy balance residual and (3) report the energy balance of the world's northernmost urban flux station. The mean detection limits were about 10% of the observed flux, and the random uncertainty was 9-16%. Of all fluxes, the latent heat flux - as measured with a closed-path gas analyser - was most prone to systematic calculation errors due to water vapour interactions with tube walls: using a lag window that is too small can cause a 15% lack of data (due to the dependency of lag time on relative humidity) and omitting spectral corrections can cause on average a 26% underestimation of the flux. The systematic errors in EC calculation propagate into the energy balance residual and can be larger than the residual itself: for example, omitting spectral corrections overestimates the residual by 13% or 18% on average, depending on the analyser.
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