Abstract
Deserts are the major source of the dust greatly impact the biogeochemical cycles. However, quantitatively evaluating iron forms in the dust source areas is still a challenge due to large uncertainty in the iron mineralogy. Here we investigate iron mineralogy of 19 surface sand samples collected from seven deserts along the arid zone in North China and Mongolia.
Highlights
Sand emission and dust production at deserts can explain the large amount of iron nutrients that affect global biogeochemical cycle [1]
Most of the identified iron phases are minor in abundance (< 1%), they are not important in the iron content
The samples from the Chinese deserts are consistently high in Fe/Si ratios relative to Mongolia Gobi desert (Figure 3)
Summary
Sand emission and dust production at deserts can explain the large amount of iron nutrients that affect global biogeochemical cycle [1]. Mineral particle is the dominant component of iron deposition into the oceans, accounts for 95% of the globally averaged atmospheric sourced iron budget [2]. A large fraction of iron loading in mineral dust is in the form of iron oxide [3,4]. Et al [5] uses a direct synchrotron-based measurement (EXAFS) to reveal that the -deducible iron phases, e.g. goethite and ferrihydrite are “inherited” from the weathering of larger particles as hornblende. Et al [6] conducts acid-leaching experiments and observed that the illite (species of muscovite) contributed heavily for the -deducible iron. Et al [7] showed that, in Asian dust, Fe
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