NDLI: Weak-wind mesoscale meandering in the nocturnal boundary layer

Content Provider	Springer Nature Link
Author	Mahrt, Larry
Copyright Year	2007
Abstract	This study examines the strength and statistical behavior of mesoscale motions on time scales up to 1 h using eight data sets over different surface types. The mesoscale motions include internal gravity waves, microfront-like structures, horizontal modes, and a complex variety of other signatures, perhaps resulting from superposition of different modes. With weak large-scale flow, the mesoscale motions lead to meandering of the wind direction, as found in previous studies. However, the meandering often takes the form of sudden wind shifts rather than oscillation of wind direction.The relative strength and impact of such mesoscale motions are examined in terms of the constancy of the wind vector, the within-record standard deviation of the wind direction and the ratio of a meso-velocity scale to the speed of the large-scale flow. The strength of the mesoscale flow varies by an order of magnitude between nights at a given site and varies systematically between sites. The statistics of the vertical structure of such motions are examined for two of the data sets, both with sonic anemometers at seven levels.
Starting Page	331
Ending Page	347
Page Count	17
File Format	PDF
ISSN	15677419
Journal	Environmental Fluid Mechanics
Volume Number	7
Issue Number	4
e-ISSN	15731510
Language	English
Publisher	Springer Netherlands
Publisher Date	2007-06-22
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dispersion Meandering Mesoscale Stratified boundary layer Nocturnal boundary layer Wind direction Oceanography Meteorology/Climatology Hydrogeology Mechanics Environmental Physics
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Water Science and Technology

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