@article{fdi:010062483, title = {{E}ffects of soot deposition on particle dynamics and microbial processes in marine surface waters}, author = {{M}ari, {X}avier and {L}ef{\`e}vre, {J}{\'e}r{\^o}me and {T}orr{\'e}ton, {J}ean-{P}ascal and {B}ettarel, {Y}van and {P}ringault, {O}livier and {R}ochelle {N}ewall, {E}mma and {M}archesiello, {P}atrick and {M}enk{\`e}s, {C}hristophe and {R}odier, {M}artine and {M}igon, {C}. and {M}otegi, {C}. and {W}einbauer, {M}. {G}. and {L}egendre, {L}.}, editor = {}, language = {{ENG}}, abstract = {{L}arge amounts of soot are continuously deposited on the global ocean. {E}ven though significant concentrations of soot particles are found in marine waters, the effects of these aerosols on ocean ecosystems are currently unknown. {U}sing 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 {N}ew {C}aledonia. {D}eposition 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 similar to 2 increase in the activity of particle-attached bacteria suggesting that soot introduced in the system favored bacterial growth. {T}hese patterns were confirmed by experiments with natural seawater conducted with both soot aerosols collected in the study area and standard diesel soot. {T}he data suggest a strong impact of soot deposition on ocean surface particles, {DOC}, and microbial processes, at least near emission hot spots.}, keywords = {{NOUVELLE} {CALEDONIE}}, booktitle = {}, journal = {{G}lobal {B}iogeochemical {C}ycles}, volume = {28}, numero = {7}, pages = {662--678}, ISSN = {0886-6236}, year = {2014}, DOI = {10.1002/2014gb004878}, URL = {https://www.documentation.ird.fr/hor/fdi:010062483}, }