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Predicting the mineral composition of dust aerosols: Insights from elemental composition measured at the Izaña Observatory
Ist Teil von
Geophysical research letters, 2016-10, Vol.43 (19), p.10,520-10,529
Ort / Verlag
United States: Blackwell Publishing Ltd
Erscheinungsjahr
2016
Link zum Volltext
Quelle
Wiley Online Library
Beschreibungen/Notizen
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 Izaña 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.
Key Points
Brittle fragmentation theory is extended to represent emitted soil aggregates that are otherwise removed during soil characterization
We reproduce the dust concentration and the nearly size‐invariant fractional abundance of Fe off the coast of West Africa
By distinguishing structural and free forms of elemental Fe model improvement can be attributed to emission of soil aggregates