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Observing Crosswind Over Urban Terrain Using Scintillometer and Doppler Lidar : Volume 8, Issue 4 (24/04/2015)

By Van Dinther, D.

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Book Id: WPLBN0003999677
Format Type: PDF Article :
File Size: Pages 11
Reproduction Date: 2015

Title: Observing Crosswind Over Urban Terrain Using Scintillometer and Doppler Lidar : Volume 8, Issue 4 (24/04/2015)  
Author: Van Dinther, D.
Volume: Vol. 8, Issue 4
Language: English
Subject: Science, Atmospheric, Measurement
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

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Nordbo, A., Wood, C. R., Hartogensis, O. K., O'connor, E. J., & Dinther, D. V. (2015). Observing Crosswind Over Urban Terrain Using Scintillometer and Doppler Lidar : Volume 8, Issue 4 (24/04/2015). Retrieved from http://worldebookfair.com/


Description
Description: Meteorology and Air Quality Group, Wageningen University, Wageningen, the Netherlands. In this study, the crosswind (wind component perpendicular to a path, U) is measured by a scintillometer and estimated with Doppler lidar above the urban environment of Helsinki, Finland, for 15 days. The scintillometer allows acquisition of a path-averaged value of U (U), while the lidar allows acquisition of path-resolved U (U (x), where x is the position along the path). The goal of this study is to evaluate the performance of scintillometer U estimates for conditions under which U (x) is variable. Two methods are applied to estimate U from the scintillometer signal: the cumulative-spectrum method (relies on scintillation spectra) and the look-up-table method (relies on time-lagged correlation functions). The values of U of both methods compare well with the lidar estimates, with root-mean-square deviations of 0.71 and 0.73 m s−1. This indicates that, given the data treatment applied in this study, both measurement technologies are able to obtain estimates of U in the complex urban environment. The detailed investigation of four cases indicates that the cumulative-spectrum method is less susceptible to a variable U (x) than the look-up-table method. However, the look-up-table method can be adjusted to improve its capabilities for estimating U under conditions under for which U (x) is variable.

Summary
Observing crosswind over urban terrain using scintillometer and Doppler lidar

Excerpt
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