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

Ward, H.C.; Evans, J.G. ORCID: https://orcid.org/0000-0003-4194-1416; Grimmond, C.S.B.. 2014 Multi-scale sensible heat fluxes in the suburban environment from large-aperture scintillometry and eddy covariance. Boundary-Layer Meteorology, 152 (1). 65-89. 10.1007/s10546-014-9916-4

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Official URL: https://link.springer.com/article/10.1007/s10546-0...

Abstract/Summary

Sensible heat fluxes (QH ) are determined using scintillometry and eddy covariance over a suburban area. Two large-aperture scintillometers provide spatially integrated fluxes across path lengths of 2.8 and 5.5 km over Swindon, UK. The shorter scintillometer path spans newly built residential areas and has an approximate source area of 2–4 km2, whilst the long path extends from the rural outskirts to the town centre and has a source area of around 5–10 km2. These large-scale heat fluxes are compared with local-scale eddycovariance measurements. Clear seasonal trends are revealed by the long duration of this dataset and variability in monthly QH is related to the meteorological conditions. At shorter time scales the response of QH to solar radiation often gives rise to close agreement between the measurements, but during times of rapidly changing cloud cover spatial differences in the net radiation (Q∗) coincide with greater differences between heat fluxes. For clear days QH lags Q∗, thus the ratio of QH to Q∗ increases throughout the day. In summer the observed energy partitioning is related to the vegetation fraction through use of a footprint model. The results demonstrate the value of scintillometry for integrating surface heterogeneity and offer improved understanding of the influence of anthropogenic materials on surface-atmosphere interactions.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1007/s10546-014-9916-4
UKCEH and CEH Sections/Science Areas:	Acreman Reynard
ISSN:	0006-8314
Additional Keywords:	energy balance, large-aperture scintillometer, seasonality, sensible heat, flux, urban areas
Date made live:	13 Mar 2019 16:06 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/522496

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1007/s10546-014-9916-4

UKCEH and CEH Sections/Science Areas:

Acreman
Reynard

ISSN:

0006-8314

Additional Keywords:

energy balance, large-aperture scintillometer, seasonality, sensible heat, flux, urban areas

Date made live:

13 Mar 2019 16:06 +0 (UTC)