Elevated stratified layers observed with SODAR during VTMX

A combination of low frequency sodar, radar wind profiler and in-situ balloon-borne measurements of temperature and water vapor have been used to investigate the structure of elevated stratified layers within the transition layer above the nocturnal boundary layer during the Vertical Transport and M...

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Bibliographic Details
Published in:Meteorology and atmospheric physics 2004, Vol.85 (1-3), p.115-123
Main Authors: COULTER, R. L, PEKOUR, M. S, MARTIN, T. J
Format: Article
Language:English
Subjects:
ACOUSTIC MEASUREMENTS
Audio equipment
BOUNDARY LAYERS
DISTANCE
Doppler radar
Earth, ocean, space
ENVIRONMENTAL SCIENCES
Evaporation
Exact sciences and technology
External geophysics
LAYERS
Meteorology
MIXING
MIXING RATIO
MOISTURE
RADAR
Temperature
TEMPERATURE MEASUREMENT
TRANSPORT
UTAH
WATER VAPOR
WIND
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Summary:A combination of low frequency sodar, radar wind profiler and in-situ balloon-borne measurements of temperature and water vapor have been used to investigate the structure of elevated stratified layers within the transition layer above the nocturnal boundary layer during the Vertical Transport and Mixing Field Campaign in Salt Lake City Utah, during October, 2000. Elevated layers determined from sodar and radar vertical time sections were penetrated with a balloon-born instrument package to determine the fine scale temperature and moisture structure of the layers. As expected a potential temperature increase was found in the upper half of the layers; however the magnitude was considerably smaller than found above the daytime well-mixed layer and the vertical distance of the increase was quite variable. Mixing ratio, in the mean was found to have a relative maximum in the lower portion of the layers. It was found that the potential temperature within the layers decreased with time relative to background values, regardless of whether the layer descended or ascended. [PUBLICATION ABSTRACT]
ISSN:0177-7971
1436-5065
DOI:10.1007/s00703-003-0039-6