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Turner, D. D., Wulfmeyer, V., Berg, L. K. and Schween, J. H. (2014). Water vapor turbulence profiles in stationary continental convective mixed layers. J. Geophys. Res.-Atmos., 119 (19). S. 11151 - 11166. WASHINGTON: AMER GEOPHYSICAL UNION. ISSN 2169-8996

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Abstract

The U. S. Department of Energy Atmospheric Radiation Measurement (ARM) program's Raman lidar at the ARM Southern Great Plains site in north central Oklahoma has collected water vapor mixing ratio (q) profile data more than 90% of the time since October 2004. Three hundred (300) cases were identified where the convective boundary layer was quasi-stationary and well mixed for a 2 h period, and q mean, variance, third-order moment, and skewness profiles were derived from the 10 s, 75 m resolution data. These cases span the entire calendar year, and demonstrate that the q variance profiles at the mixed layer (ML) top changes seasonally and is strongly related to the gradient of q across the interfacial layer. The q variance at the top of the ML shows onlyweak correlations (r < 0.3) with sensible heat flux, Deardorff convective velocity scale, and turbulence kinetic energy measured at the surface. The median q skewness profile is most negative at 0.85 z(i), zero at approximately z(i), and positive above z(i), where z(i) is the depth of the convective ML. The spread in the q skewness profiles is smallest between 0.95 z(i) and z(i). The q skewness at altitudes between 0.6 z(i) and 1.2 z(i) is correlated with the magnitude of the q variance at z(i), with increasingly negative values of skewness observed lower down in the ML as the variance at z(i) increases, suggesting that in cases with larger variance at z(i) there is deeper penetration of the warm, dry free tropospheric air into the ML.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Turner, D. D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wulfmeyer, V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Berg, L. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Schween, J. H. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-425676
DOI:	10.1002/2014JD022202
Journal or Publication Title:	J. Geophys. Res.-Atmos.
Volume:	119
Number:	19
Page Range:	S. 11151 - 11166
Date:	2014
Publisher:	AMER GEOPHYSICAL UNION
Place of Publication:	WASHINGTON
ISSN:	2169-8996
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language LARGE-EDDY SIMULATIONS; BOUNDARY-LAYER; RAMAN LIDAR; ATMOSPHERIC RADIATION; AIRCRAFT OBSERVATIONS; ENTRAINMENT; TEMPERATURE; VARIANCE; VELOCITY; SKEWNESS Multiple languages Meteorology & Atmospheric Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42567