@article{fdi:010049180,
  title = {{T}rends in primary production, sea surface temperature and wind in upwelling systems (1998-2007)},
  author = {{D}emarcq, {H}erv{\'e}},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e take advantage of the longest high quality single-sensor global data set of ocean color available today to explore recent trends in the primary productivity of the main eastern boundary upwelling systems ({EBUE}s): {C}alifornia, {C}anary, {H}umboldt and {B}enguela. {T}he chlorophyll-a concentration is used as a proxy for primary production. {SST} data from {AVHRR} and wind speed data from {Q}uik{SCAT} are used in conjunction with this data set to analyse forcing mechanisms explaining the chlorophyll biomass. {W}hereas the worldwide prima ry-production biomass shows on average decreasing trends, as already observed in the stratified part of the worldwide ocean, the productivity of most {EBUE}s increases during the study period. {T}hese contrasting trends are both significant, at least for the mid latitude range of 50 degrees {S}-50 degrees {N}, where the data coverage is sufficient for accurate estimation. {P}robably due to the large scale atmospheric forcing, trends in sea surface temperature ({SST}) show nonsignificant relationships with the trends in biomass within upwelling systems, suggesting that {SST} anomalies cannot be used as an indicator of change in upwelling intensity in a continuous warming context. {O}n the other hand, upwelling favourable equatorward winds show a significant correlation with the observed trends in biomass, suggesting that the trends in the trade winds are probably linked to an increase in the intensity of the {H}adley cell circulation observed during the last several decades.},
  keywords = {},
  booktitle = {},
  journal = {{P}rogress in {O}ceanography},
  volume = {83},
  numero = {1-4},
  pages = {376--385},
  ISSN = {0079-6611},
  year = {2009},
  DOI = {10.1016/j.pocean.2009.07.022},
  URL = {https://www.documentation.ird.fr/hor/fdi:010049180},
}