Effects of soot deposition on particle dynamics and microbial processes in marine surface waters

Large amounts of soot are continuously deposited on the global ocean. Even though significant concentrations of soot particles are found in marine waters, the effects of these aerosols on ocean ecosystems are currently unknown. Using a combination of in situ and experimental data, and results from a...

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Vydané v:Global biogeochemical cycles Ročník 28; číslo 7; s. 662 - 678
Hlavní autori: Mari, Xavier, Lefèvre, Jérôme, Torréton, Jean-Pascal, Bettarel, Yvan, Pringault, Olivier, Rochelle-Newall, Emma, Marchesiello, Patrick, Menkes, Christophe, Rodier, Martine, Migon, Christophe, Motegi, Chiaki, Weinbauer, Markus G., Legendre, Louis
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: Washington Blackwell Publishing Ltd 01.07.2014
American Geophysical Union
Predmet:
Aerosols
aggregation
Air pollution
Atoms & subatomic particles
bacteria
Dissolved organic carbon
Earth Sciences
Ecosystems
Environmental Sciences
Marine ecosystems
Oceanography
particle
Sciences of the Universe
Seawater
Soot
Surface water
virus
ISEW, Pacific, New Caledonia
ISSN:0886-6236, 1944-9224, 1944-8224
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Shrnutí:Large amounts of soot are continuously deposited on the global ocean. Even though significant concentrations of soot particles are found in marine waters, the effects of these aerosols on ocean ecosystems are currently unknown. Using a combination of in situ and experimental data, and results from an atmospheric transport model, we show that the deposition of soot particles from an oil‐fired power plant impacted biogeochemical properties and the functioning of the pelagic ecosystem in tropical oligotrophic oceanic waters off New Caledonia. Deposition was followed by a major increase in the volume concentration of suspended particles, a change in the particle size spectra that resulted from a stimulation of aggregation processes, a 5% decrease in the concentration of dissolved organic carbon (DOC), a decreases of 33 and 23% in viral and free bacterial abundances, respectively, and a factor ~2 increase in the activity of particle‐attached bacteria suggesting that soot introduced in the system favored bacterial growth. These patterns were confirmed by experiments with natural seawater conducted with both soot aerosols collected in the study area and standard diesel soot. The data suggest a strong impact of soot deposition on ocean surface particles, DOC, and microbial processes, at least near emission hot spots. Key Points Soot deposition affects microbial pelagic ecosystemsSoot particles adsorb dissolved organic carbon and stimulate aggregationSoot stimulates the activity of particle‐attached bacteria
Bibliografia:ark:/67375/WNG-5TZL308N-5
istex:9A7B0EE5F492168B51AE54B88BAE89E006C3E959
ArticleID:GBC20175
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:0886-6236
1944-9224
1944-8224
DOI:10.1002/2014GB004878