Particulate and dissolved aluminum and titanium in the upper water column of the Atlantic Ocean.

Dammshäuser, Anna, Wagener, Thibaut, Garbe-Schönberg, Dieter and Croot, Peter (2013) Particulate and dissolved aluminum and titanium in the upper water column of the Atlantic Ocean. Deep Sea Research Part I: Oceanographic Research Papers, 73 . pp. 127-139. DOI 10.1016/j.dsr.2012.12.002.

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Abstract

This study investigates the oceanic behavior of the lithogenic trace elements Al and Ti in the upper 200 m of the Atlantic Ocean. The distribution of both metals in the dissolved and particulate phases was assessed along an E-W transect in the eastern tropical North Atlantic (December 2009) and along a meridional Atlantic transect (April-May 2010). The surface water concentrations of particulate and dissolved Al and Ti reflected the previously observed pattern of atmospheric inputs into the Atlantic Ocean. Subsurface minima at stations with pronounced fluorescence maxima were observed, suggesting a link between biological productivity and the removal of both dissolved and particulate Al and Ti. This may include uptake mechanisms, adsorption and aggregation processes on biogenic particle surfaces and the formation of large, fast sinking biogenic particles, e.g., fecal pellets. Residence times in the upper water column (100 m) of the tropical and subtropical North Atlantic were estimated to range in the order of days to weeks in the particulate phases (Al: 3-22 days, Ti: 4-37 days) and were 0.9-3.8 years for Al and 10-31 years for Ti in the dissolved phases. Longer residence times in both phases in the South Atlantic are consistent with lower biological productivity and decreased removal rates. In the upper water column, Al was predominantly present in the dissolved form, whereas Ti mostly occurred in the particulate form. Largest deviations in the partition coefficients between the particulate and dissolved phases were found in the surface waters, together with excess dissolved Al over Ti compared to the crustal source. This likely reflects elevated dissolution of Al compared to Ti from atmospheric mineral particles

Document Type: Article
Keywords: Aluminum; Titanium; Suspended particulate matter; Dust; Residence times; Scavenging; Central Equatorial Pacific; surface waters; Tropical Atlantic Ocean; trace elements; Sargasso Sea; deep ocean; suspended particles; biogenic sediment; Saharan dust
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
Kiel University
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.dsr.2012.12.002
ISSN: 0967-0637
Projects: SOPRAN
Expeditions/Models/Experiments:
Date Deposited: 11 Apr 2013 07:16
Last Modified: 02 Nov 2016 10:51
URI: http://oceanrep.geomar.de/id/eprint/21036

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