Other
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012georl..3905807i&link_type=abstract
Geophysical Research Letters, Volume 39, Issue 5, CiteID L05807
Other
Atmospheric Composition And Structure: Aerosols And Particles (0345, 4801, 4906), Atmospheric Composition And Structure: Air/Sea Constituent Fluxes (3339, 4504), Atmospheric Composition And Structure: Biosphere/Atmosphere Interactions (0426, 1610), Atmospheric Composition And Structure: Constituent Sources And Sinks, Atmospheric Composition And Structure: Geochemical Cycles (1030)
Scientific paper
Global models have been used to deduce atmospheric iron supply to the ocean, but the uncertainty remains large. We used a global chemical transport model to investigate the effect of the estimated size distribution of dust on the bioavailable iron deposition. Simulations are performed with six different size distributions for dust aerosols at emission using similar aerosol optical depths (AODs) to constrain the total emission flux of dust. The global dust emission rate using a recent theoretical estimate for the dust size distribution at emission (2116 Tg yr-1) is about two times larger than the average of estimates using the other four empirical size distributions (1089 ± 469 Tg yr-1). In contrast to the large differences in total emissions, the emission of fine dust (diameter < 2.5 μm) is relatively robust (176 ± 34 Tg yr-1), due to the strong constraint of AOD on fine dust emission. Our model results indicate that soluble iron (SFe) deposition is relatively invariant to the dust size distribution at emission in regions where most soluble iron is provided by acid mobilization of fine dust. In contrast, the use of the theoretical size distribution suggests a larger deposition of SFe (by a factor of 1.2 to 5) in regions where the concentration of acidic gases is insufficient to promote iron dissolution in dust particles, such as the South Atlantic. These results could have important implications for the projection of marine ecosystem feedbacks to climate change and highlight the necessity to improve the dust size distribution.
Feng Yangyue
Ito Akinori
Kok Jasper F.
Penner Joyce E.
No associations
LandOfFree
Does a theoretical estimation of the dust size distribution at emission suggest more bioavailable iron deposition? does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Does a theoretical estimation of the dust size distribution at emission suggest more bioavailable iron deposition?, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Does a theoretical estimation of the dust size distribution at emission suggest more bioavailable iron deposition? will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1559263