@article{fdi:010070297,
  title = {{A}ir-sea {CO}2 fluxes for the {B}razilian northeast continental shelf in a climatic transition region},
  author = {{C}arvalho, {A}. {C}. {O}. and {M}arins, {R}. {V}. and {D}ias, {F}. {J}. {S}. and {R}ezende, {C}. {E}. and {L}ef{\`e}vre, {N}athalie and {C}avalcante, {M}. {S}. and {E}schrique, {S}. {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{O}ceanographic cruises were carried out in {O}ctober 2012 (3 degrees {S} -5 degrees {S} and 38,5 degrees {W} -35,5 degrees {W}) and in {S}eptember 2014 (1 degrees {S}-4 degrees {S} and 43 degrees {W}-37 degrees {W}), measuring atmospheric and sea surface {CO}2 fugacity (f{CO}(2)) underway in the northeast coast of {B}razil. {S}ea surface water samples were also collected for chlorophyll a, nutrients and {DOC} analysis. {D}uring the second cruise, the sampling area covered a transition between semi-arid to more humid areas of the coast, with different hydrologic and rainfall regimes. {T}he seawater f{CO}(2)({SW}), in {O}ctober 2012, was in average 400.9 +/- 7.3 mu atm and 391.1 +/- 63 mu atm in {S}eptember 2014. {F}or the atmosphere, the f{CO}(2)(air) in {O}ctober 2012 was 375.8 +/- 2.0 mu atm and in {S}eptember 2014, 368.9 +/- 2.2 mu atm. {T}he super-saturation of the seawater in relation to the atmosphere indicates a source of {CO}2 to the atmosphere. {T}he entire study area presents oligotrophic conditions. {D}espite the low concentrations, {C}hl a and nutrients presented significant influence on f{CO}(2)({SW}), particularly in the westernmost and more humid part of the northeast coast, where river fluxes are three orders of magnitude larger than eastern rivers and rainfall events are more intense and constant. f{CO}(2)({SW}) spatial distribution presented homogeneity along the same transect and longitudinal heterogeneity, between east and west, reinforcing the hypothesis of transition between two regions of different behaviour. {T}he f{CO}(2)({SW}) at the eastern portion was controlled by parameters such as temperature and salinity. {A}t the western portion, or was influenced by nutrient and {C}hl a. {C}alculated instantaneous {CO}2 flux ranged from + 1.66 to + 724 mmol m(-2) d(-1) in the first cruise and + 0.89 to + 14.62 mmol m(-2) d(-1) in the second cruise.},
  keywords = {{CO}2 fugacity ; {D}ry season ; {E}quatorial {A}tlantic ; {C}hlorophyll a ; delta {C}-13 ; {ATLANTIQUE} ; {BRESIL} ; {ZONE} {EQUATORIALE}},
  booktitle = {},
  journal = {{J}ournal of {M}arine {S}ystems},
  volume = {173},
  numero = {},
  pages = {70--80},
  ISSN = {0924-7963},
  year = {2017},
  DOI = {10.1016/jjmarsys.2017.04.009},
  URL = {https://www.documentation.ird.fr/hor/fdi:010070297},
}