@article{fdi:010085264,
  title = {{C}irculation patterns and associated rainfall over {S}outh {T}ropical {S}outh {A}merica : {GCM}s evaluation during the dry-to-wet transition season},
  author = {{O}lmo, {M}. {E}. and {E}spinoza, {J}. {C}. and {B}ettolli, {M}. {L}. and {S}ierra, {J}. {P}. and {J}unquas, {C}l{\'e}mentine and {A}rias, {P}. {A}. and {M}oron, {V}. and {B}almaceda-{H}uarte, {R}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he representation of the {S}outh {A}merican {M}onsoon {S}ystem ({SAMS}) by general circulation models ({GCM}s) is of key relevance for a better understanding of the physical rationale behind the recent climate changes over {S}outh {T}ropical {S}outh {A}merica ({STSA}) and their expected changes in a global warming scenario. {D}uring the last four decades, {STSA} experienced a lengthening of the dry season associated with diverse forcings. {I}n this work, a set of 16 {GCM}s historical {C}oupled {M}odel {I}ntercomparison {P}roject {P}hase 6 coupled simulations were evaluated during 1979-2014 in terms of how well they reproduced the atmospheric circulation over {STSA} through a circulation-patterns ({CP}s) approach. {N}ine {CP}s were first identified based on low-level winds from the {ERA}5 reanalysis. {F}ocus was put on the representation of {CP}s during the dry-to-wet transition season ({J}uly-{O}ctober). {M}odel performance depended on the seasonal cycle and spatial structure of the {CP}s. {GCM}s adequately reproduced the different {CP}s, with lower skills in the transition seasons. {GCM}s tended to go from dry to wet conditions too quickly, evidencing deficiencies in the representation of the {SAMS} onset, related to a poor representation of the southerly wind intrusions to {STSA} and the variability of the {S}outh {A}merican low-level jet. {S}ome {GCM}s were able to associate the occurrence of anomalous dry and wet years with specific {CP}s, suggesting well-represented physical mechanisms controlling precipitation variability. {T}his study could identify a few {GCM}s that adequately simulated the {CP}s in {STSA} (among them, {CESM}2, {CMCC}-{CM}2-{HR}4 and {MPI}-{ESM}1-2-{HR}), which is relevant for driving high-resolution models and the analysis of future projections.},
  keywords = {{A}mazon region ; circulation patterns ; {S}outh {A}merican monsoon ; precipitation ; general circulation models ; {CMIP}6 ; {AMERIQUE} {DU} {SUD} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch : {A}tmospheres},
  volume = {127},
  numero = {12},
  pages = {e2022{JD}036468 [20 ]},
  ISSN = {2169-897{X}},
  year = {2022},
  DOI = {10.1029/2022jd036468},
  URL = {https://www.documentation.ird.fr/hor/fdi:010085264},
}