Surface water dissolved aluminum and titanium: Tracers for specific time scales of dust deposition to the Atlantic?
Article first published online: 17 DEC 2011
© 2011 by the American Geophysical Union
Geophysical Research Letters
Volume 38, Issue 24, 28 December 2011
How to Cite
2011), Surface water dissolved aluminum and titanium: Tracers for specific time scales of dust deposition to the Atlantic? Geophys. Res. Lett., 38, L24601, doi:10.1029/2011GL049847., , and (
- Issue published online: 17 DEC 2011
- Article first published online: 17 DEC 2011
- Manuscript Accepted: 9 NOV 2011
- Manuscript Revised: 8 NOV 2011
- Manuscript Received: 29 SEP 2011
 Surface water distributions of dissolved Al (dAl) and dissolved Ti (dTi) were investigated along a meridional Atlantic transect and related to dust deposition estimates. In the zone of Saharan dust deposition, highest dAl concentrations occurred in the tropical salinity minimum and suggest increasing Al dissolution from Saharan aerosols with wet deposition. By contrast, the dTi distribution is not related to precipitation but agrees with the pattern of annual dust deposition. In the zone of Patagonian dust deposition, elevated dTi concentrations contrasted with decreased dAl concentrations, indicating excess dAl scavenging onto biogenic particles in surface waters. Estimated residence times range from months to years for dAl and are ∼10 times higher for dTi. This suggests that dAl reflects seasonal changes in dust deposition, while dTi is related to longer temporal scales. However, spatial variations in input and removal processes complicate the quantification of dust deposition from surface water concentrations.