Premium
Mineral particle size as a control on aerosol iron solubility
Author(s) -
Baker A. R.,
Jickells T. D.
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl026557
Subject(s) - aerosol , solubility , mineral dust , particle size , biogeochemical cycle , precipitation , particle (ecology) , atmospheric sciences , mineral , dissolution , environmental science , mineralogy , environmental chemistry , chemistry , materials science , geology , oceanography , meteorology , physics , metallurgy , organic chemistry
Aerosol iron solubility is a major uncertainty in the global biogeochemical cycle of iron and, via its impact on ocean productivity, the carbon cycle and their influence on global climate. Previous studies have reported widely different values for this solubility (0.01 – 80%). Here we show that the primary control on aerosol iron solubility is the surface area to volume ratio of mineral aerosol particles, which changes during atmospheric transport as mineral aerosol concentration decreases due to preferential removal of larger particles (assuming particle morphology to be relatively constant with particle size). This important result indicates that aerosol iron solubility is not fixed, but will change predictably as an inverse function of dust concentration on both spatial and temporal (e.g. glacial – interglacial) scales.