@article{fdi:010086087,
  title = {{A}n update on dissolved methane distribution in the subtropical {N}orth {A}tlantic {O}cean},
  author = {{K}olomijeca, {A}. and {M}arx, {L}. and {R}eynolds, {S}. and {C}ariou, {T}hierry and {M}awji, {E}. and {B}oulart, {C}.},
  editor = {},
  language = {{ENG}},
  abstract = {{M}ethane ({CH}4) is a potent greenhouse gas and plays a significant role in recent increasing global temperatures. {T}he oceans are a natural source of methane contributing to atmospheric methane concentrations, yet our understanding of the oceanic methane cycle is poorly constrained. {A}ccumulating evidence indicates that a significant part of oceanic {CH}4 is produced in oxygenated surface waters as a by-product of phytoplanktonic activity. {T}his study focused on the subtropical {N}orth {A}tlantic {O}cean (26 degrees {N}, 80 ' {W} and 26 degrees {N}, 18 ' {W}) where the distribution of dissolved {CH}4 concentrations and associated air-sea fluxes during winter 2020 were investigated. {W}ater samples from 64 stations were collected from the upper water column up to depths of 400 m. {T}he upper oxic mixed layer was oversaturated in dissolved {CH}4 with concentrations ranging 3-7 nmol {L}-1, with the highest concentrations of 7-10 nmol {L}-1 found to the east of the transect, consistent with other subtropical regions of the world's oceans. {T}he high anomalies of dissolved {CH}4 were found to be associated with phosphate-depleted waters and regions where the abundance of the ubiquitous picocyanobacteria {S}ynechococcus and {P}rochlorococcus were elevated. {A}lthough other phytoplanktonic phyla cannot be excluded, this suggests that cyanobacteria contribute to the release of {CH}4 in this region. {T}he calculation of air-sea fluxes further confirmed the subtropical {N}orth {A}tlantic {O}cean as a source of {CH}4. {T}his study provides evidence to corroborate the key role that picocyanobacteria play in helping to explain the oversaturation of {CH}4 found in surface mixed layer of the open ocean, otherwise known as the "ocean methane paradox".},
  keywords = {{ATLANTIQUE} {NORD} ; {ZONE} {SUBTROPICALE}},
  booktitle = {},
  journal = {{O}cean {S}cience},
  volume = {18},
  numero = {5},
  pages = {1377--1388},
  ISSN = {1812-0784},
  year = {2022},
  DOI = {10.5194/os-18-1377-2022},
  URL = {https://www.documentation.ird.fr/hor/fdi:010086087},
}