Balme, Matthew; Metzger, Stephen; Towner, Martin; Ringrose, Tim; Greeley, Ronald and Iversen, James
(2003).
| DOI (Digital Object Identifier) Link: | http://dx.doi.org/doi:10.1029/2003GL017493 |
|---|---|
| Google Scholar: | Look up in Google Scholar |
Abstract
Using in-situ field measurements, we determined surface friction velocities (u*) and aerodynamic roughness heights (z0) at the base of 10 dust devils. z0 values agree closely with previous studies in this region and range from 0.1 to 1.0 cm. The peak u* coincide with the largest wind speed measurements within the dust devil and range from 0.9 to 2.4 ms−1. Surface friction velocities are sufficient to lift all types of windblown material from dust to pebble sized particles. Peak u* values for dust devils appear to be a linear function of the peak wind speed measured at ~2 m height within the dust devil. This provides a simple approximation for estimating surface shear stress for dust devils.
| Item Type: | Journal Article |
|---|---|
| Copyright Holders: | 2003 American Geophysical Union. |
| ISSN: | 1944-8007 |
| Funders: | NASA (Planetary Geology and Geophysics program), United Kingdom Particle Physics and Astronomy Research Council |
| Academic Unit/Department: | Science > Physical Sciences ?? scie-pssr ?? |
| Interdisciplinary Research Centre: | Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR) |
| Item ID: | 4954 |
| Depositing User: | Users 6044 not found. |
| Date Deposited: | 29 Nov 2006 |
| Last Modified: | 18 Sep 2012 14:43 |
| URI: | http://oro.open.ac.uk/id/eprint/4954 |
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