Universität zu Köln

Ishizuka, Masahide ORCID: 0000-0001-9296-4103, Mikami, Masao, Leys, John F., Shao, Yaping ORCID: 0000-0002-2041-5479, Yamada, Yutaka and Heidenreich, Stephan (2014). Power law relation between size-resolved vertical dust flux and friction velocity measured in a fallow wheat field. Aeolian Res., 12. S. 87 - 100. OXFORD: ELSEVIER SCI LTD. ISSN 2212-1684

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Abstract

Size-resolved dust flux measurements are important for estimation of concentration and physical properties of dust particles in the atmosphere and their impacts on cloud and radiation transfer. In this study, we evaluate the power law relationship between size-resolved dust flux, F-air,F-d, and friction velocity, u(*). During the Japan-Australia Dust Experiment, size-resolved dust fluxes were estimated with the gradient method by using data from optical particle counters and profile measurements of wind speed and air temperature in a dry, non-crusted fallow wheat field in Australia. When a power law is fitted to the U-*-F-air,F-d relation, i.e., F-air,F-d-u(*)(n), the coefficient of determination R-2 is largest for n = 4. However, when a power law is fitted separately to data of each particle size range, n is found to depend on the particle size with values of 2.54 (0.7 mu m), 3.40 (1.1 mu m), 3.80 (1.7 mu m), 4.32 (2.6 mu m), 4.67 (4.6 mu m), and 4.53 (7.0 mu m), respectively, and maximum n was 4.67 for the 4.6 mu m diameter. This suggests that the F-air,F-d-u(*)(n) relationship is not universal, and embedded in n is the nature of soil aggregation. For practical purposes, n should be determined separately for each particle size range when estimating size-resolved dust fluxes. (C) 2013 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Ishizuka, Masahide UNSPECIFIED orcid.org/0000-0001-9296-4103 UNSPECIFIED Mikami, Masao UNSPECIFIED UNSPECIFIED UNSPECIFIED Leys, John F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Shao, Yaping UNSPECIFIED orcid.org/0000-0002-2041-5479 UNSPECIFIED Yamada, Yutaka UNSPECIFIED UNSPECIFIED UNSPECIFIED Heidenreich, Stephan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-444334
DOI:	10.1016/j.aeolia.2013.11.002
Journal or Publication Title:	Aeolian Res.
Volume:	12
Page Range:	S. 87 - 100
Date:	2014
Publisher:	ELSEVIER SCI LTD
Place of Publication:	OXFORD
ISSN:	2212-1684
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WIND EROSION; MINERAL DUST; SALTATION BOMBARDMENT; NUMBER CONCENTRATION; TAKLIMAKAN DESERT; EMISSION SCHEME; AEROSOL; STORMS; MODEL; ENTRAINMENT Multiple languages Geography, Physical Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/44433