Atmospheric deposition fluxes over the Atlantic Ocean: a GEOTRACES case study

Jan-Lukas Menzel Barraqueta, Jessica K. Klar, Martha Gledhill, Christian Schlosser, Rachel Shelley, Hélène F. Planquette, Bernhard Wenzel, Geraldine Sarthou, Eric P. Achterberg
2019 Biogeosciences  
<p><strong>Abstract.</strong> Atmospheric deposition is an important source of micronutrients to the ocean, but atmospheric deposition fluxes remain poorly constrained in most ocean regions due to the limited number of field observations of wet and dry atmospheric inputs. Here we present the distribution of dissolved aluminium (dAl), as a tracer of atmospheric inputs, in surface waters of the Atlantic Ocean along GEOTRACES sections GA01, GA06, GA08, and GA10. We used the surface mixed-layer
more » ... ace mixed-layer concentrations of dAl to calculate atmospheric deposition fluxes using a simple steady state model. We have optimized the Al fractional aerosol solubility, the dAl residence time within the surface mixed layer and the depth of the surface mixed layer for each separate cruise to calculate the atmospheric deposition fluxes. We calculated the lowest deposition fluxes of <span class="inline-formula">0.15±0.1</span> and <span class="inline-formula">0.27±0.13</span>&amp;thinsp;g&amp;thinsp;m<span class="inline-formula"><sup>−2</sup></span>&amp;thinsp;yr<span class="inline-formula"><sup>−1</sup></span> for the South and North Atlantic Ocean (<span class="inline-formula">&amp;gt;40</span><span class="inline-formula"><sup>∘</sup></span>&amp;thinsp;S and <span class="inline-formula">&amp;gt;40</span><span class="inline-formula"><sup>∘</sup></span>&amp;thinsp;N) respectively, and the highest fluxes of 1.8 and 3.09&amp;thinsp;g&amp;thinsp;m<span class="inline-formula"><sup>−2</sup></span>&amp;thinsp;yr<span class="inline-formula"><sup>−1</sup></span> for the south-east Atlantic and tropical Atlantic Ocean, respectively. Overall, our estimations are comparable to atmospheric dust deposition model estimates and reported field-based atmospheric deposition estimates. We note that our estimates diverge from atmospheric dust deposition model flux estimates in regions influenced by riverine Al inputs and in upwelling regions. As dAl is a key trace element in the GEOTRACES programme, the approach presented in this study allows calculations of atmospheric deposition fluxes at high spatial resolution for remote ocean regions.</p>
doi:10.5194/bg-16-1525-2019 fatcat:nyec4kfmszewrnylixccqxaila