期刊
GEOPHYSICAL RESEARCH LETTERS
卷 43, 期 19, 页码 10520-10529出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016GL069873
关键词
soil dust; dust mineral composition; size distribution
资金
- Department of Energy [DE-SC0006713]
- NASA Modeling, Analysis and Prediction Program
- Aerosol Global Atmospheric Watch program of Izana Observatory
- AEMET
- Ministry of Economy and Competitiveness of Spain
- European Regional Development Fund (ERDF), POLLINDUST [CGL2011-26259]
- European Regional Development Fund (ERDF), AEROATLAN [CGL2015-66229-P]
- U.S. Department of Energy (DOE) [DE-SC0006713] Funding Source: U.S. Department of Energy (DOE)
Regional variations of dust mineral composition are fundamental to climate impacts but generally neglected in climate models. A challenge for models is that atlases of soil composition are derived from measurements following wet sieving, which destroys the aggregates potentially emitted from the soil. Aggregates are crucial to simulating the observed size distribution of emitted soil particles. We use an extension of brittle fragmentation theory in a global dust model to account for these aggregates. Our method reproduces the size-resolved dust concentration along with the approximately size-invariant fractional abundance of elements like Fe and Al in the decade-long aerosol record from the Izana Observatory, off the coast of West Africa. By distinguishing between Fe in structural and free forms, we can attribute improved model behavior to aggregation of Fe and Al-rich clay particles. We also demonstrate the importance of size-resolved measurements along with elemental composition analysis to constrain models.
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