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Use of the Doppler Spectral Width to Improve the Estimation of the Convective Boundary Layer Height from UHF Wind Profiler Observations

Use of the Doppler Spectral Width to Improve the Estimation of the Convective Boundary Layer... Enhancement of the air refractive index structure parameter C 2 n often occurs at the top of the convective boundary layer (CBL), where the absolute values of the vertical gradients of virtual potential temperature and mixing ratio have a peak. This well-known behavior of the C 2 n profiles is often used to locate the height of the mixed layer Z i from UHF wind profiler observations. In the present study, Z i determination with the C 2 n -based technique was investigated for a case of clear-air CBL and a case of cloud-topped CBL. In certain circumstances, such as multifold C 2 n peaks or poorly defined peaks, these techniques fail to correctly retrieve CBL height. In order to improve Z i determination, a new method based on the conjoint use of C 2 n and Doppler spectral width profiles is proposed and discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Atmospheric and Oceanic Technology American Meteorological Society

Use of the Doppler Spectral Width to Improve the Estimation of the Convective Boundary Layer Height from UHF Wind Profiler Observations

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Publisher
American Meteorological Society
Copyright
Copyright © 2000 American Meteorological Society
ISSN
1520-0426
DOI
10.1175/1520-0426(2003)020<0408:UOTDSW>2.0.CO;2
Publisher site
See Article on Publisher Site

Abstract

Enhancement of the air refractive index structure parameter C 2 n often occurs at the top of the convective boundary layer (CBL), where the absolute values of the vertical gradients of virtual potential temperature and mixing ratio have a peak. This well-known behavior of the C 2 n profiles is often used to locate the height of the mixed layer Z i from UHF wind profiler observations. In the present study, Z i determination with the C 2 n -based technique was investigated for a case of clear-air CBL and a case of cloud-topped CBL. In certain circumstances, such as multifold C 2 n peaks or poorly defined peaks, these techniques fail to correctly retrieve CBL height. In order to improve Z i determination, a new method based on the conjoint use of C 2 n and Doppler spectral width profiles is proposed and discussed.

Journal

Journal of Atmospheric and Oceanic TechnologyAmerican Meteorological Society

Published: Sep 25, 2000

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