Universität zu Köln

Zhang, Jie ORCID: 0000-0003-1379-5976, Teng, Zhenjiao, Huang, Ning, Guo, Lei and Shao, Yaping ORCID: 0000-0002-2041-5479 (2016). Surface renewal as a significant mechanism for dust emission. Atmos. Chem. Phys., 16 (24). S. 15517 - 15529. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1680-7324

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Abstract

Wind tunnel experiments of dust emissions from different soil surfaces are carried out to better understand dust emission mechanisms. The effects of surface renewal on aerodynamic entrainment and saltation bombardment are analyzed in detail. It is found that flow conditions, surface particle motions (saltation and creep), soil dust content and ground obstacles all strongly affect dust emission, causing its rate to vary over orders of magnitude. Aerodynamic entrainment is highly effective, if dust supply is unlimited, as in the first 2-3 min of our wind tunnel runs. While aerodynamic entrainment is suppressed by dust supply limits, surface renewal through the motion of surface particles appears to be an effective pathway to remove the supply limit. Surface renewal is also found to be important to the efficiency of saltation bombardment. We demonstrate that surface renewal is a significant mechanism affecting dust emission and recommend that this mechanism be included in future dust models.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Zhang, Jie UNSPECIFIED orcid.org/0000-0003-1379-5976 UNSPECIFIED Teng, Zhenjiao UNSPECIFIED UNSPECIFIED UNSPECIFIED Huang, Ning UNSPECIFIED UNSPECIFIED UNSPECIFIED Guo, Lei UNSPECIFIED UNSPECIFIED UNSPECIFIED Shao, Yaping UNSPECIFIED orcid.org/0000-0002-2041-5479 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-252436
DOI:	10.5194/acp-16-15517-2016
Journal or Publication Title:	Atmos. Chem. Phys.
Volume:	16
Number:	24
Page Range:	S. 15517 - 15529
Date:	2016
Publisher:	COPERNICUS GESELLSCHAFT MBH
Place of Publication:	GOTTINGEN
ISSN:	1680-7324
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WIND EROSION; RESUSPENSION; MODEL; SPEED Multiple languages Environmental Sciences; Meteorology & Atmospheric Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/25243