Preferential dust sources: A geomorphological classification designed for use in global dust-cycle models

被引:144
作者
Bullard, Joanna E. [1 ]
Harrison, Sandy P. [2 ,3 ]
Baddock, Matthew C. [4 ]
Drake, Nick [5 ]
Gill, Thomas E. [6 ]
McTainsh, Grant [7 ]
Sun, Youbin [8 ]
机构
[1] Univ Loughborough, Dept Geog, Loughborough LE11 3TU, Leics, England
[2] Univ Bristol, Sch Geol Sci, Bristol, Avon, England
[3] Macquarie Univ, Sch Biol Sci, N Ryde, NSW 2109, Australia
[4] Univ Virginia, Dept Environm Sci, Charlottesville, VA 22904 USA
[5] Kings Coll London, Dept Geog, London WC2R 2LS, England
[6] Univ Texas El Paso, Dept Geol Sci, El Paso, TX 79968 USA
[7] Griffith Univ, Griffith Sch Environm, Brisbane, Qld 4111, Australia
[8] Chinese Acad Sci, Inst Earth Environm, Xian 711075, Peoples R China
关键词
WIND-SPEED VARIABILITY; OWENS DRY LAKE; DESERT DUST; MINERAL DUST; CHIHUAHUAN DESERT; SAHARAN DUST; SIZE DISTRIBUTIONS; EVAPORITE MINERALS; LATE PLEISTOCENE; SOUTHERN NEVADA;
D O I
10.1029/2011JF002061
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
We present a simple theoretical land-surface classification that can be used to determine the location and temporal behavior of preferential sources of terrestrial dust emissions. The classification also provides information about the likely nature of the sediments, their erodibility and the likelihood that they will generate emissions under given conditions. The scheme is based on the dual notions of geomorphic type and connectivity between geomorphic units. We demonstrate that the scheme can be used to map potential modern-day dust sources in the Chihuahuan Desert, the Lake Eyre Basin and the Taklamakan. Through comparison with observed dust emissions, we show that the scheme provides a reasonable prediction of areas of emission in the Chihuahuan Desert and in the Lake Eyre Basin. The classification is also applied to point source data from the Western Sahara to enable comparison of the relative importance of different land surfaces for dust emissions. We indicate how the scheme could be used to provide an improved characterization of preferential dust sources in global dust-cycle models.
引用
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页数:20
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