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African biomass burning is a substantial source of phosphorus deposition to the Amazon, Tropical Atlantic Ocean, and Southern Ocean. | LitMetric

AI Article Synopsis

  • * Researchers gathered data on total and soluble P from aerosols in Cayenne, French Guiana, revealing that African dust contributes significantly to P during boreal spring, but surprisingly high levels of soluble P were found in boreal fall due to biomass burning from southern Africa.
  • * The findings suggest that aerosols from African biomass burning are actually a major source of soluble P for the Amazon and Southern Hemisphere oceans, potentially playing a more critical role in enhancing marine productivity than previously thought.

Article Abstract

The deposition of phosphorus (P) from African dust is believed to play an important role in bolstering primary productivity in the Amazon Basin and Tropical Atlantic Ocean (TAO), leading to sequestration of carbon dioxide. However, there are few measurements of African dust in South America that can robustly test this hypothesis and even fewer measurements of soluble P, which is readily available for stimulating primary production in the ocean. To test this hypothesis, we measured total and soluble P in long-range transported aerosols collected in Cayenne, French Guiana, a TAO coastal site located at the northeastern edge of the Amazon. Our measurements confirm that in boreal spring when African dust transport is greatest, dust supplies the majority of P, of which 5% is soluble. In boreal fall, when dust transport is at an annual minimum, we measured unexpectedly high concentrations of soluble P, which we show is associated with the transport of biomass burning (BB) from southern Africa. Integrating our results into a chemical transport model, we show that African BB supplies up to half of the P deposited annually to the Amazon from transported African aerosol. This observational study links P-rich BB aerosols from Africa to enhanced P deposition in the Amazon. Contrary to current thought, we also show that African BB is a more important source of soluble P than dust to the TAO and oceans in the Southern Hemisphere and may be more important for marine productivity, particularly in boreal summer and fall.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6697889PMC
http://dx.doi.org/10.1073/pnas.1906091116DOI Listing

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