39 research outputs found
Atmospheric deposition fluxes over the Atlantic Ocean: a GEOTRACES case study
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 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 0.15±0.1 and 0.27±0.13 g mâ2 yrâ1
for the South and North Atlantic Ocean (>40â S and >40â N) respectively, and the highest fluxes of 1.8
and 3.09 g mâ2 yrâ1 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
Emissions and Energy Impacts of the Inflation Reduction Act
If goals set under the Paris Agreement are met, the world may hold warming
well below 2 C; however, parties are not on track to deliver these commitments,
increasing focus on policy implementation to close the gap between ambition and
action. Recently, the US government passed its most prominent piece of climate
legislation to date, the Inflation Reduction Act of 2022 (IRA), designed to
invest in a wide range of programs that, among other provisions, incentivize
clean energy and carbon management, encourage electrification and efficiency
measures, reduce methane emissions, promote domestic supply chains, and address
environmental justice concerns. IRA's scope and complexity make modeling
important to understand impacts on emissions and energy systems. We leverage
results from nine independent, state-of-the-art models to examine potential
implications of key IRA provisions, showing economy wide emissions reductions
between 43-48% below 2005 by 2035
Lattice-preferred orientations of late-Variscan granitoids derived from neutron diffraction data: implications for magma emplacement mechanisms
Brazilian young dental practitioners' use and acceptance of digital radiographic examinations
Atmospheric deposition fluxes over the Atlantic Ocean : a GEOTRACES case study
CITATION: Barraqueta, J., et al. 2019. Atmospheric deposition fluxes over the Atlantic Ocean : a GEOTRACES case study. Biogeosciences, 16:1525â1542. doi:10.5194/bg-16-1525-2019The original publication is available at https://www.biogeosciences.net/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 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 0.15±0.1 and 0.27±0.13âgâmâ2âyrâ1 for the South and North Atlantic Ocean (>40ââS and >40ââN) respectively, and the highest fluxes of 1.8 and 3.09âgâmâ2âyrâ1 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.Department of Scientific Politics of the Basque GovernmentGEOMAR Helmholtz Center for Ocean Research Kielhttps://bg.copernicus.org/articles/16/1525/2019/Publisherâs versio
Atmospheric deposition fluxes over the Atlantic Ocean: A GEOTRACES case study
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 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 th e surface mixed layer for each separate cruise to calculate the atmosphericdeposition fluxes. We calculated the lowest deposition fluxes of 0:150:1 and 0:27 0:13 gm2 yr1 for the South and North Atlantic Ocean (> 40 S and > 40 N) respectively, and the highest fluxes of 1.8 and 3.09 gm2 yr1 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