@article{fdi:010069526,
  title = {{W}ater biogeochemistry of a mangrove-dominated estuary under a semi-arid climate ({N}ew {C}aledonia)},
  author = {{L}eopold, {A}. and {M}archand, {C}yril and {D}eborde, {J}. and {A}llenbach, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{M}angrove water biogeochemistry has been frequently studied under tropical climates, but less is known regarding mangroves in semi-arid climates. {I}n this study, we examine the carbon and nutrient biogeochemistry in a mangrove tidal creek and in the main branch of a semi-arid estuary in {N}ew {C}aledonia. {P}orewater seepage represents a source of nutrients ({DON}, {NH}4 (+), and {DIP}), carbon ({DOC} and {CO}2), and alkalinity for the water column, but seawater dilution of the mangrove inputs is observed. {S}patial and tidal variations in {CO}2 fluxes along the tidal creek suggest that porewater seepage is a driver of {CO}2 emission into the atmosphere. {L}arge seasonal and spatial differences in the biogeochemical functioning of the main channel are observed and are mainly related to the seasonal rainfall pattern. {D}uring the rainy season, the watershed influences the entire estuary, which exhibits a typical positive circulation. {D}uring the dry season, the estuary turns into a salt-plug region with positive and negative circulations in the upper and lower reaches, respectively. {I}n this case, the upper and lower reaches seem to function independently, and the biogeochemical functioning of their water column is not controlled by the same processes. {S}urprisingly, p{CO}(2)@27 {A} degrees {C} values tend to be higher during the dry season, as do the total alkalinity ({TA}lk) values, while the p{H} values exhibit an opposite trend. {M}oreover, the {TA}lk values are higher in the lower reaches during the wet season and in the upper reaches during the dry season. {T}hese results indicate high in situ biogeochemical reactions and high porewater influence during the dry season, likely because of a low flushing rate and high water residence time after salt plug establishment. {A}lthough our results suggest that salt plugs may significantly affect the water column's biogeochemistry and may promote {CO}2 emissions of mangrove-derived carbon, further investigations, especially mass balance studies, are required to quantify their role in the biogeochemical functioning of such estuarine systems.},
  keywords = {{M}angrove ; {W}ater column biogeochemistry ; {S}emi-arid climate ; {E}stuary ; {N}ew {C}aledonia ; {NOUVELLE} {CALEDONIE} ; {ZONE} {SEMIARIDE}},
  booktitle = {},
  journal = {{E}stuaries and {C}oasts},
  volume = {40},
  numero = {3},
  pages = {773--791},
  ISSN = {1559-2723},
  year = {2017},
  DOI = {10.1007/s12237-016-0179-9},
  URL = {https://www.documentation.ird.fr/hor/fdi:010069526},
}