@article{fdi:010081036,
  title = {{I}ncreased {A}mazon {B}asin wet-season precipitation and river discharge since the early 1990s driven by tropical {P}acific variability},
  author = {{F}riedman, {A}. {R}. and {B}ollasina, {M}. {A}. and {G}astineau, {G}. and {K}hodri, {M}yriam},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {A}mazon {B}asin, the largest watershed on {E}arth, experienced a significant increase in wet-season precipitation and high-season river discharge from the early 1990s to early 2010s. {S}ome studies have linked the increased {A}mazon {B}asin hydrologic cycle to decadal trends of increased {P}acific trade winds, eastern {P}acific sea surface temperature ({SST}) cooling, and associated strengthening of the {P}acific {W}alker circulation. {H}owever, it has been difficult to disentangle the role of {P}acific decadal variability from the impacts of greenhouse gases and other external climate drivers over the same period. {H}ere, we separate the contributions of external forcings from those of {P}acific decadal variability by comparing two large ensembles of climate model experiments with identical radiative forcing agents but imposing different tropical {P}acific wind stress. {O}ne ensemble constrains tropical {P}acific wind stress to its long-term climatology, suppressing tropical {P}acific decadal variability; the other ensemble imposes the observed tropical {P}acific wind stress anomalies, simulating realistic tropical {P}acific decadal variability. {C}omparing the {A}mazon {B}asin hydroclimate response in the two ensembles allows us to distinguish the contributions of external forcings common to both simulations from those related to {P}acific trade wind variability. {F}or the 1992-2012 trend, the experiments with observed tropical {P}acific wind stress anomalies simulate strengthening of the {W}alker circulation between the {P}acific and {S}outh {A}merica and sharpening of the {P}acific-{A}tlantic interbasin {SST} contrast, driving increased {A}mazon {B}asin wet-season precipitation and high-season discharge. {I}n contrast, these circulation and hydrologic intensification trends are absent in the simulations with climatological tropical {P}acific wind stress. {T}his work underscores the importance of {P}acific decadal variability in driving hydrological cycle changes and modulating the hydroclimate impacts of global warming over the {A}mazon {B}asin.},
  keywords = {{W}alker circulation ; {P}acific decadal variability ; {A}mazon {R}iver discharge ; wind stress forcing ; {A}mazon {B}asin precipitation ; large ensemble ; simulations ; {AMAZONIE} ; {PACIFIQUE} ; {ZONE} {TROPICALE} ; {AMAZONE} {BASSIN}},
  booktitle = {},
  journal = {{E}nvironmental {R}esearch {L}etters},
  volume = {16},
  numero = {3},
  pages = {034033 [11 ]},
  ISSN = {1748-9326},
  year = {2021},
  DOI = {10.1088/1748-9326/abd587},
  URL = {https://www.documentation.ird.fr/hor/fdi:010081036},
}