Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 17, 11389-11401, 2017
https://doi.org/10.5194/acp-17-11389-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
26 Sep 2017
Anthropogenic dust emissions due to livestock trampling in a Mongolian temperate grassland
Erdenebayar Munkhtsetseg1, Masato Shinoda2, Masahide Ishizuka3, Masao Mikami4, Reiji Kimura5, and George Nikolich6 1Meteorology, Hydrology and Permafrost Laboratory, National University of Mongolia, Ulaanbaatar, Mongolia
2Graduate School of Environmental Studies, Nagoya University, Nagoya, Japan
3Kagawa University, Takamatsu, Japan
4Meteorological Research Institute, Tsukuba, Japan
5Arid Land Research Center, Tottori University, Tottori, Japan
6Desert Research Institute, Nevada University, Las Vegas, USA
Abstract. Mongolian grasslands are a natural dust source region and they contribute to anthropogenic dust due to the long tradition of raising livestock there. Past decades of abrupt changes in a nomadic society necessitate a study on the effects of livestock trampling on dust emissions, so that research studies may help maintain a sustainable ecosystem and well-conditioned atmospheric environment. In this study, we conducted a mini wind tunnel experiment (using a PI-SWERL® device) to measure dust emissions fluxes from trampling (at three disturbance levels of livestock density, N) and zero trampling (natural as the background level) at test areas in a Mongolian temperate grassland. Moreover, we scaled anthropogenic dust emissions to natural dust emissions as a relative consequence of livestock trampling. We found a substantial increase in dust emissions due to livestock trampling. This effect of trampling on dust emissions was persistent throughout all wind friction velocities, u* (varying from 0.44 to 0.82 m s−1). Significantly higher dust loading occurs after a certain disturbance level has been reached by the livestock trampling. Our results suggest that both friction velocity (u*) and disturbance level of livestock density (N) have an enormous combinational effect on dust emissions from the trampling test surface. This means that the effect of livestock trampling on dust emissions can be seen or revealed when wind is strong. Our results also emphasize that better management for livestock allocation coupled with strategies to prevent anthropogenic dust loads are needed. However, there are many uncertainties and assumptions to be improved on in this study.

Citation: Munkhtsetseg, E., Shinoda, M., Ishizuka, M., Mikami, M., Kimura, R., and Nikolich, G.: Anthropogenic dust emissions due to livestock trampling in a Mongolian temperate grassland, Atmos. Chem. Phys., 17, 11389-11401, https://doi.org/10.5194/acp-17-11389-2017, 2017.
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Short summary
Anthropogenic dust emissions induced by livestock trampling were measured using a mini wind tunnel device in Mongolian temperate grassland. A scale factor in dust emissions revealed an enhanced effect of trampling on dust emissions. The enhancement rate in dust emissions was enlarged by increased friction velocity. Our results emphasize that better livestock management is crucial to prevent dust loads by reducing the effect of trampling on dust emissions in dust seasons driven by strong winds.
Anthropogenic dust emissions induced by livestock trampling were measured using a mini wind...
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