Revisiting atmospheric dust export to the Southern Hemisphere ocean: Biogeochemical implications
International audience Aerosol concentrations in the Southern Hemisphere are largely undersampled. This study presents a chemical and physical description of dust particles collected on board research vessels in the southeast Pacific (SEPS) and the Southern Ocean (SOKS). Concentrations of dust were...
Published in: | Global Biogeochemical Cycles |
---|---|
Main Authors: | , , , , |
Other Authors: | , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2008
|
Subjects: | |
Online Access: | https://hal.science/hal-02567410 https://hal.science/hal-02567410/document https://hal.science/hal-02567410/file/2007GB002984.pdf https://doi.org/10.1029/2007GB002984 |
Summary: | International audience Aerosol concentrations in the Southern Hemisphere are largely undersampled. This study presents a chemical and physical description of dust particles collected on board research vessels in the southeast Pacific (SEPS) and the Southern Ocean (SOKS). Concentrations of dust were 6.1 ± 2.4 ng m À3 for SEPS and 13.0 ± 6.3 ng m À3 for SOKS. Dust fluxes, derived from those concentrations, were 9.9 ± 3.7 mg m À2 d À1 for SEPS and 38 ± 14 mg m À2 d À1 for SOKS and are shown to be representative of actual fluxes in those areas. Dust and iron deposition are up to 2 orders of magnitude lower than former predictions. A map of dust deposition on the Southern Hemisphere is proposed by incorporating those in situ measurements into a dust model. This study confirms that dust deposition is not the dominant source of iron to the large high-nutrient low-chlorophyll Southern Ocean. |
---|