Multi - scale sensible heat fluxes in the suburban environment from 1 large aperture scintillometry and eddy covariance

10 Sensible heat fluxes (QH) are determined using scintillometry and eddy covariance over a 11 suburban area. Two large aperture scintillometers provide spatially integrated fluxes across path 12 lengths of 2.8 km and 5.5 km over Swindon, UK. The shorter scintillometer path spans newly built 13 residential areas and has an approximate source area of 2-4 km, whilst the long path extends from 14 the rural outskirts to the town centre and has a source area of around 5-10 km. These large-scale 15 heat fluxes are compared with local-scale eddy covariance measurements. Clear seasonal trends are 16 revealed by the long duration of this dataset and variability in monthly QH is related to the 17 meteorological conditions. At shorter time scales the response of QH to solar radiation often gives 18 rise to close agreement between the measurements, but during times of rapidly changing cloud 19 cover spatial differences in the net radiation (Q*) coincide with greater differences between heat 20 fluxes. For clear days QH lags Q*, thus the ratio of QH to Q* increases throughout the day. In 21 summer the observed energy partitioning is related to the vegetation fraction through use of a 22 footprint model. The results demonstrate the value of scintillometry for integrating surface 23 heterogeneity and offer improved understanding of the influence of anthropogenic materials on 24 surface-atmosphere interactions. 25