An Investigation of the Atmospheric Boundary Layer over the Arctic Ocean Using SODAR (Sound Detection and Ranging).

An attempt to describe the atmospheric boundary layer during the (Marginal Ice Zone Experiment) MIZEX 84 from 11 July to 17 July was made using a sodar system. The computation of the temperature structure parameter CT2 in the surface layer using in situ measurements allowed the calibration of the sy...

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Bibliographic Details
Main Author: Rouge,Etienne de
Other Authors: NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Format: Text
Language:English
Published: 1985
Subjects:
Atmospheric Physics
Acoustic Detection and Detectors
*BOUNDARY LAYER
*SOUND WAVES
*ATMOSPHERIC SOUNDING
COMPUTER PROGRAMS
COMPUTATIONS
REFRACTIVE INDEX
ACOUSTIC DETECTION
THESES
BACKSCATTERING
CALIBRATION
SEA ICE
ARCTIC REGIONS
TEMPERATURE INVERSION
HEIGHT FINDING
MIZEX(Marginal Ice Zone Experiment)
Atmospheric boundary layer
SODAR(Sound Detection and Ranging)
Polar queen research vessel
Arctic
Arctic Ocean
Sea ice
Online Access:http://www.dtic.mil/docs/citations/ADA161057
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA161057
Description
Summary:An attempt to describe the atmospheric boundary layer during the (Marginal Ice Zone Experiment) MIZEX 84 from 11 July to 17 July was made using a sodar system. The computation of the temperature structure parameter CT2 in the surface layer using in situ measurements allowed the calibration of the system. A program was developed to obtain the inversion layer height Zi, where the signal reaches a maximum. The thickness of the inversion layer was also computed and was used with the calibration law to compute CT(2) at the inversion layer. Refractive trapping conditions were evident on 15 July although the generally small value of the heat flux did not indicate a strongly unstable boundary layer. Comparison with two radiosonde profiles shows good agreement in one case. It is the purpose of this thesis to calibrate the sodar system deployed by the research vessel POLAR QUEEN during MIZEX 84 to obtain the refractive-index structure parameter. The tme-height structure of the boundary layer will also be investigated. Efforts will also be made to compute the height of the inversion layer and to estimate its thickness, the jump of potential temperature, and the refractive-index gradient. Abstract in French.

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