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How well can we quantify dust deposition to the ocean?

R F Anderson1,2, H Cheng3,4, R L Edwards3

  • 1Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, USA boba@ldeo.columbia.edu.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|October 17, 2017
PubMed
Summary

Estimating mineral aerosol (dust) deposition in the Eastern Tropical North Atlantic Ocean showed significant variations among methods. Further research is needed to refine techniques for accurate dust flux mapping.

Keywords:
GEOTRACESaerosolsdustnortheast tropical Atlantic

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Area of Science:

  • Oceanography
  • Geochemistry
  • Atmospheric Science

Background:

  • Continental mineral aerosols, commonly known as dust, play a crucial role in marine biogeochemical cycles.
  • Understanding dust deposition is vital for assessing its impact on ocean ecosystems and climate.

Purpose of the Study:

  • To estimate mineral aerosol (dust) deposition in the Eastern Tropical North Atlantic Ocean.
  • To compare various observational strategies for dust flux estimation against a global model.
  • To identify uncertainties and areas for improvement in dust deposition measurement techniques.

Main Methods:

  • Utilized multiple strategies including aerosol measurements, dissolved trace metals in seawater, particulate matter filtration, sediment traps, and sediment core analysis.
  • Integrated data from US GEOTRACES expeditions (2010-2011) and existing literature.
  • Compared observational results with dust deposition generated by a global model.

Main Results:

  • Observation-based dust flux estimates varied by up to two orders of magnitude.
  • Most methods showed consistency with the reference model within a factor of 5.
  • Calculated dust deposition using methods with lower uncertainties was 2-5 times lower than the model, suggesting potential model overestimation.

Conclusions:

  • Significant discrepancies exist among different dust deposition estimation methods, highlighting the need for further refinement.
  • Current observational strategies require improvement to reduce uncertainties for routine dust flux mapping.
  • The reference global model might overestimate dust deposition in the study region.