Frank, Martin , Abouchami, W., Alexander, B., Balzer, W., Barnes, C., Camara-Mor, P., Ehlert, Claudia, Fichtner, V., Fischer, M., Galer, S., Goldstein, F., Hagenow, A., Haynert, Kristin, Heinze, Jutta, Masque, P., Merschel, G., Koschinsky, A., Kraft, Steffanie, Kretschmer, Kerstin, Kretschmer, S., Lorenzen, J., Ostendorf, M., Poehle, S., Roth, C., Staubwasser, M., Stumpf, Roland, Tang, X., Teschner, Claudia, Truscheit, T., Vogt, Martin and Zieringer, Moritz (2013) Trace Metals and Their Isotopes in the Tropical Atlantic Ocean - Cruise No. M81/1, February 04 – March 08, 2010, Las Palmas (Canary Islands, Spain) – Port of Spain (Trinidad & Tobago). . METEOR-Berichte, M81/1 . DFG-Senatskommission für Ozeanographie, Bremen, 36 pp. DOI 10.2312/cr_m81_1.

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Abstract

Summary

Meteor Cruise M81/1 was dedicated to the investigation of the distribution of dissolved and
particulate trace metals and their isotopic compositions (TEIs) in the full water column of the
tropical Atlantic Ocean and their driving factors including main external inputs and internal
cycling and ocean circulation. The research program is embedded in the international
GEOTRACES program (e.g. Henderson et al., 2007), which this cruise was an official part of
and thus corresponds to GEOTRACES cruise GA11. This cruise was completely dedicated to the
trace metal clean and contamination-free sampling of waters and particulates for subsequent
analyses of the TEIs in the home laboratories of the national and international participants.
Besides a standard rosette for the less contaminant prone metals, trace metal clean sampling was
realized by using a dedicated and coated trace metal clean rosette equipped with Teflon-coated
GO-FLO bottles operated via a polyester coated cable from a mobile winch that was thankfully
made available by the U.S. partners of the GEOTRACES program for this cruise. The particulate
samples were also collected under trace metal clean conditions using established in-situ pump
systems. The cruise track led the cruise southward from the Canary Islands to 11°S and then
continued northwestward along the northern margin of South America until it reached Port of
Spain, Trinidad & Tobago. The track crossed areas of major external inputs including exchange
with the volcanic Canary Islands, the Saharan dust plume, as well as the plume of the Amazon
outflow. In terms of internal cycling the equatorial high biological productivity band, as well as
increased productivity associated with the Amazon Plume were covered. All major water masses
contributing the Atlantic Meridional Overturning Circulation, as well as the distinct narrow
equatorial surface and subsurface east-west current bands were sampled. A total of 17 deep
stations were sampled for the different dissolved TEIs, which were in most cases accompanied
by particulate sampling. In addition, surface waters were continuously sampled under trace metal
clean conditions using a towed fish.

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