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...
Heo, Bok-Haeng; Jacoby-Koaly, Sandra; Kim, Kyung-Eak; Campistron, Bernard; Benech, Bruno; Jung, Eun-Sil
2000-09-25 00:00:00
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.pngJournal of Atmospheric and Oceanic TechnologyAmerican Meteorological Societyhttp://www.deepdyve.com/lp/american-meteorological-society/use-of-the-doppler-spectral-width-to-improve-the-estimation-of-the-0pB6gTOEK1
Use of the Doppler Spectral Width to Improve the Estimation of the Convective Boundary Layer Height from UHF Wind Profiler Observations
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 Technology
– American Meteorological Society
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