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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
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Volume 16, issue 18 | Copyright
Atmos. Chem. Phys., 16, 11807-11821, 2016
https://doi.org/10.5194/acp-16-11807-2016
© Author(s) 2016. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 22 Sep 2016

Research article | 22 Sep 2016

Can simple models predict large-scale surface ocean isoprene concentrations?

Dennis Booge1, Christa A. Marandino1, Cathleen Schlundt1, Paul I. Palmer2, Michael Schlundt1, Elliot L. Atlas3, Astrid Bracher4,5, Eric S. Saltzman6, and Douglas W. R. Wallace7 Dennis Booge et al.
  • 1GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
  • 2School of GeoSciences, University of Edinburgh, Edinburgh, UK
  • 3Rosenstiel School of Marine and Atmospheric Science (RSMAS), University of Miami, Miami, FL, USA
  • 4Alfred Wegener Institute – Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany
  • 5Institute of Environmental Physics, University Bremen, Bremen, Germany
  • 6Department of Earth System Science, University of California, Irvine, CA, USA
  • 7Department of Oceanography, Dalhousie University, Halifax, Canada

Abstract. We use isoprene and related field measurements from three different ocean data sets together with remotely sensed satellite data to model global marine isoprene emissions. We show that using monthly mean satellite-derived chl a concentrations to parameterize isoprene with a constant chl a normalized isoprene production rate underpredicts the measured oceanic isoprene concentration by a mean factor of 19±12. Improving the model by using phytoplankton functional type dependent production values and by decreasing the bacterial degradation rate of isoprene in the water column results in only a slight underestimation (factor 1.7±1.2). We calculate global isoprene emissions of 0.21TgC for 2014 using this improved model, which is twice the value calculated using the original model. Nonetheless, the sea-to-air fluxes have to be at least 1 order of magnitude higher to account for measured atmospheric isoprene mixing ratios. These findings suggest that there is at least one missing oceanic source of isoprene and, possibly, other unknown factors in the ocean or atmosphere influencing the atmospheric values. The discrepancy between calculated fluxes and atmospheric observations must be reconciled in order to fully understand the importance of marine-derived isoprene as a precursor to remote marine boundary layer particle formation.

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Isoprene, a biogenic trace gas, is an important precursor of secondary organic aerosol/cloud condensation nuclei. Here, we use isoprene and related field measurements from three different ocean data sets together with remotely sensed satellite data to model global marine isoprene emissions. Our findings suggest that there is at least one missing oceanic source of isoprene and possibly other unknown factors in the ocean or atmosphere influencing the atmospheric values.
Isoprene, a biogenic trace gas, is an important precursor of secondary organic aerosol/cloud...
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