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Project: Ground-based remote sensing systems and environmental meteorology

Staff: Petra Seibert

Co-operation:

Henk Klein-Baltink (KNMI, Utrecht, NL),

Matthias Langer (Environmental Meteorology, ZAMG, Vienna, A),

Job Verkaik (Meteorology Dept., Wageningen Agricultural University, NL)

and others.

Summary:

A number of smaller activities are or were carried out under this heading. Their basis is the sodar system which has been operated by the environmental working group since 1985 (at that time still at University of Vienna). From 1985 until 1993, a Remtech A0 system was used which was then replaced by a Remtech PA2 system. For more information on sodars in general, see the web pages of the International Society of Acoustic Remote Sensing (which are also hosted by IMP).

Deriving parameters of the CBL from sodar measurements of sigma w:
In the context of a diploma thesis of M. Langer at the Institute of Meteorology and Geosphysics at the University of Vienna, the possibility to derive the mixing height and the convective scaling velocity w* under convective conditions from vertical profiles of the standard deviation of the vertical wind velocity as measured by the Doppler sodar A0 of the Remtech S.A. was studied. For this purpose, an analytical profile was fitted to the measured data. Results (comparisons with evaluations of radio soundings and output of the OML preprocessor as well as Monte-Carlo-investigations of the general applicability of the method) were not encouraging.

Sodar - tower comparison at Cabauw / NL:
A comparison between the PA2 Doppler sodar of Remtech S.A., the boundary-layer wind profiler of Radian Inc., and in-situ measurements of the mean wind velocity and turbulence parameters at the 200 m tower of KNMI in Cabauw (Netherlands) has been carried out between September 1996 and January 1997. First results indicate that the mean horizontal wind is measured well by the sodar while there are major problems with the standard deviation of the vertical wind component.

COST Action 76 ("Development of VHF/UHF wind profiler radars and other vertical sounders for use in European observing systems"):
Petra Seibert is a member of WG 2/3 of this action and, together with Henk Klein-Baltink, taking care of the boundary-layer applications of wind profilers in the compilation of the final report of COST-76.

See also under COST-710 / Mixing Height Determination which is related to this topic, too.

Publications:

Seibert P., M. Langer (1994): Deriving characteristic parameters of the convective boundary layer from sodar measurements of the vertical velocity variance. Proc. 7th Int. Symp. on Acoustic Remote Sensing and Assoc. Techniques of the Atmosphere and Oceans, Boulder, 37 Oct. 1994, 225 230.

Seibert P., M. Langer (1996): Deriving characteristic parameters of the convective boundary layer from sodar measurements of the vertical velocity variance. Bound.-Layer Meteor. 81, 11-22.

Seibert P. (1996): The role of ground-based remote sensing techniques in providing input to modern dispersion models. Proc. 8th Int. Symp. on Acoustic Remote Sensing and Assoc. Techniques of the Atmosphere and Oceans, Moscow, 27-31 May 1996, 5-1 - 5-8.

Seibert P. (1997): Comparison measurements of a commercial sodar with in-situ instruments at the 200 m mast of KNMI in Cabauw / Netherlands. Final report for research grant GZ 30.558/1-II/A/3/96 of the Federal Ministry of Science and Tranport, Vienna. 21 pp.

Seibert P. (1998): Long-time comparison of Remtech PA2 sodar wind and turbulence measurements with Cabauw tower data. Österr. Beiträge zu Meteorologie und Geophysik, 17 (Preprints of the 9th Int. Symp. on Acoustic Remote Sensing and Associated Techniques of the Atmosphere and Oceans, Vienna, 6-10 July 1998), pp. 136-139.
[View or download postscript file : isars98.ps (8.2 MB) or isars98.ps.gz (1.0 MB)]

Mursch-Radlgruber E., M. Piringer, P. Seibert (1998): Österreichische Beiträge zur Sodar Technologie. 1. Fachgespräch Sodar, Neuherberg 23./24.6.1998, D-85764 Oberschleissheim, Bundesamt f. Strahlenschutz, pp. 151-165.

Seibert P. (1999): Special issue on acoustic remote sensing and associated techniques of the atmosphere and oceans - Introductory Comments. Meteor. Atmos. Phys., 71 (1-2), 1-2.

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Last update: 14.12.2003 by P. Seibert | URL of this page: http://www.boku.ac.at/imp/envmet/profiler.html