Program and Agenda

Abstract

CONTRASTING BEHAVIOR OF CD, FE AND MN IN THE EASTERN TROPICAL ATLANTIC COMPARED TO THE EASTERN TROPICAL PACIFIC

In the Eastern Tropical North Atlantic (ETNA) Ocean atmospheric dust is the main source of Mn to surface waters (Wuttig et al., in prep., 2013). However this study provides clear evidence that equatorial upwelling and sediment resuspension are important Mn sources in this region. In contrast to findings from the Eastern Tropical Pacific (ETP), where unexpected high surface concentrations were observed, no secondary Mn(II) maximum was found in the ETNA. This could have been introduced by a combination of lateral transport of Mn rich waters from the coastal margins and reduction of Mn-oxides. While Aeolian sources were predominantly influencing Mn and also Fe cycling in the ETNA, Cd was not controlled by dust deposition. These biologically relevant elements exhibited contrasting distribution patterns. For Fe and Mn, atmospheric depositions masked a classical nutrient type profile, while Cd was very depleted at the surface and concentrations steadily increased with depth. Cd was highly correlated to Phosphate. The Cd/P ratio was mainly controlled by P with elevated concentrations at depth resulting in strongly differing ratios in surface and subsurface layers.

ePoster:

Authors

Wuttig, K., GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany, kwuttig@geomar.de

Wagener, T., Université d'Aix-Marseille, CNRS/ INSU, IRD, Institut Méditerranéen d’Océanologie (MIO), UM 110, France, thibaut.wagener@univmed.fr

Streu, P., GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany, pstreu@geomar.de

Croot, P. L., Earth and Ocean Sciences, School of Natural Sciences, National University of Ireland, Galway (NUIG), Ireland, peter.croot@nuigalway.ie>,

Details

Poster presentation

Session #:080
Date: 2/27/2014
Time: 16:00 - 18:00
Location: Poster/Exhibit Hall

Presentation is given by student: No

PosterID: 120