NDLI: Airborne Lidar Observations of the Transition Zone Between the Convective Boundary Layer and Free Atmosphere During the International H2O Project (IHOP) in 2002

Content Provider	Springer Nature Link
Author	Grabon, Jeffrey S. Davis, Kenneth J. Kiemle, Christoph Ehret, Gerhard
Copyright Year	2009
Abstract	Airborne, light detection and ranging (lidar) backscatter observations of the convective boundary layer from the International H2O Project (IHOP) in 2002 are analysed to study the structure of the transition zone; the backscatter gradient between the convective boundary layer and free atmosphere. A new mathematical algorithm is developed and used to extract high-resolution (15 m) transition-zone boundaries from 6,500 km (flight legs) of airborne observations. The cospectra of transition-zone boundaries and its thickness indicate that thickness changes occur from boundaries moving in opposite directions (vertically) at small wavelengths (<1 km), while at longer wavelengths (>1 km) both boundaries move coherently, with the lower boundary changing altitude more rapidly. Daily probability distributions of the transition-zone thickness are positively skewed with a mode of 60 m. The structure of the transition zone shows no dependence on the “overall” Richardson number, unlike the entrainment zone. This study provides the first quantitative characterization of the structure of the instantaneous transition zone, a contribution towards an improved understanding of convective boundary-layer entrainment.
Starting Page	61
Ending Page	83
Page Count	23
File Format	PDF
ISSN	00068314
Journal	Boundary-Layer Meteorology
Volume Number	134
Issue Number	1
e-ISSN	15731472
Language	English
Publisher	Springer Netherlands
Publisher Date	2009-11-08
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Convective boundary layer Entrainment zone International H2O project Lidar Transition zone Atmospheric Protection/Air Quality Control/Air Pollution Meteorology/Climatology
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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