Observing crosswind over urban terrain using scintillometer and Doppler lidar

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http://hdl.handle.net/10138/161777

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van Dinther , D , Wood , C R , Hartogensis , O K , Nordbo , A & O'Connor , E J 2015 , ' Observing crosswind over urban terrain using scintillometer and Doppler lidar ' , Atmospheric Measurement Techniques , vol. 8 , no. 4 , pp. 1901-1911 . https://doi.org/10.5194/amt-8-1901-2015

Title: Observing crosswind over urban terrain using scintillometer and Doppler lidar
Author: van Dinther, D.; Wood, C. R.; Hartogensis, O. K.; Nordbo, A.; O'Connor, E. J.
Contributor: University of Helsinki, Department of Physics
Date: 2015
Language: eng
Number of pages: 11
Belongs to series: Atmospheric Measurement Techniques
ISSN: 1867-1381
URI: http://hdl.handle.net/10138/161777
Abstract: In this study, the crosswind (wind component perpendicular to a path, U-perpendicular to) 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-perpendicular to ((U-perpendicular to) over bar), while the lidar allows acquisition of path-resolved U-perpendicular to (U-perpendicular to(x), where x is the position along the path). The goal of this study is to evaluate the performance of scintillometer estimates for conditions under which U-perpendicular to(x) is variable. Two methods are applied to estimate (U-perpendicular to) over bar 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-perpendicular to) over bar of both methods compare well with the lidar estimates, with root-mean-square deviations of 0.71 and 0.73 ms(-1). This indicates that, given the data treatment applied in this study, both measurement technologies are able to obtain estimates of (U-perpendicular to) over bar in the complex urban environment. The detailed investigation of four cases indicates that the cumulative-spectrum method is less susceptible to a variable U-perpendicular to (x) /than the look-up-table method. However, the look-up-table method can be adjusted to improve its capabilities for estimating (U-perpendicular to) over bar under conditions under for which U-perpendicular to (x) is variable.
Subject: LARGE-APERTURE SCINTILLOMETER
FLEVOLAND FIELD EXPERIMENT
SENSIBLE HEAT FLUXES
HETEROGENEOUS SURFACE
WIND MEASUREMENTS
HELSINKI
TURBULENCE
FINLAND
SCINTILLATIONS
ANEMOMETRY
114 Physical sciences
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