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Infrared and Millimetre-wave Scintillometry in the Suburban Environment – Part 1: Structure Parameters : Volume 7, Issue 11 (17/11/2014)

By Ward, H. C.

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Book Id: WPLBN0004000057
Format Type: PDF Article :
File Size: Pages 52
Reproduction Date: 2015

Title: Infrared and Millimetre-wave Scintillometry in the Suburban Environment – Part 1: Structure Parameters : Volume 7, Issue 11 (17/11/2014)  
Author: Ward, H. C.
Volume: Vol. 7, Issue 11
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Evans, J. G., B. Grimmon, C. S., Bradford, J., & Ward, H. C. (2014). Infrared and Millimetre-wave Scintillometry in the Suburban Environment – Part 1: Structure Parameters : Volume 7, Issue 11 (17/11/2014). Retrieved from

Description: Centre for Ecology and Hydrology, Wallingford, Oxfordshire, OX10 8BB, UK. Scintillometry, a form of ground-based remote sensing, provides the capability to estimate surface heat fluxes over scales of a few hundred metres to kilometres. Measurements are spatial averages, making this technique particularly valuable over areas with moderate heterogeneity such as mixed agricultural or urban environments. In this study, we present the structure parameters of temperature and humidity, which can be related to the sensible and latent heat fluxes through similarity theory, for a suburban area in the UK. The fluxes are provided in the second paper of this two-part series. A unique millimetre-wave scintillometer was combined with an infrared scintillometer along a 5.5 km path over northern Swindon. The pairing of these two wavelengths offers sensitivity to both temperature and humidity fluctuations and the so-called bichromatic-correlation method is also used to retrieve the path-averaged temperature-humidity correlation. Comparison is made with structure parameters calculated from an eddy covariance station located close to the centre of the scintillometer path. The performance of the techniques under different conditions is discussed. Similar behaviour is seen between the two datasets at sub-daily timescales. For the two summer-to-winter periods presented here, similar evolution is displayed across the seasons. A higher vegetation fraction within the scintillometer source area is consistent with the lower Bowen ratio observed (midday Bowen ratio < 1) compared with more built-up areas around the eddy covariance station. The energy partitioning is further explored in the copanion paper.

Infrared and millimetre-wave scintillometry in the suburban environment – Part 1: Structure parameters

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