@article{fdi:010054333,
  title = {{L}arge-scale circulation patterns and related rainfall in the {A}mazon {B}asin : a neuronal networks approach},
  author = {{E}spinoza, {J}.{C}. and {L}engaigne, {M}atthieu and {R}onchail, {J}. and {J}anicot, {S}erge},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his study describes the main circulation patterns ({CP}) in the {A}mazonian {B}asin over the 1975-2002 period and their relationship with rainfall variability. {CP}s in the {A}mazonian {B}asin have been computed for each season from the {ERA}-40 daily 850 h{P}a winds using an approach combining artificial neural network ({S}elf {O}rganizing {M}aps) and {H}ierarchical {A}scendant {C}lassification. {A} 6 to 8 cluster solutions (depending on the season considered) is shown to yield an integrated view of the complex regional circulation variability. {F}or austral fall, winter and spring the temporal evolution between the different {CP}s shows a clear tendency to describe a cycle, with southern wind anomalies and their convergence with the trade winds progressing northward from the {L}a {P}lata {B}asin to the {A}mazon {B}asin. {T}his sequence is strongly related to eastward moving extra tropical perturbations and their incursion toward low latitude that modulate the geopotential and winds over {S}outh {A}merica and its adjoining oceans. {D}uring {A}ustral summer, {CP}s are less spatially and temporally organized compared to other seasons, principally due to weaker extra tropical perturbations and more frequent shallow low situations. {E}ach of these {CP}s is shown to be associated with coherent northward moving regional rainfall patterns (both in in situ data and {ERA}-40 reanalysis) and convective activity. {H}owever, our results reveals that precipitation variability is better reproduced by {ERA}-40 in the southern part of the {A}mazonian {B}asin than in the northern part, where rainfall variability is likely to be more constrained by local and subdaily processes (e.g. squall lines) that could be misrepresented in the reanalysis dataset. {T}his analysis clearly illustrates the existing connections between the southern and northern part of the {A}mazonian {B}asin in terms of regional circulation/rainfall patterns. {T}he identification of these {CP}s provide useful information to understand local rainfall variability and could hence be used to better understand the influence of these {CP}s on the hydrological variability in the {A}mazonian {B}asin.},
  keywords = {{C}irculation patterns ; {S}outh {A}merica ; {A}mazon {B}asin ; {R}ainfall ; {L}ow level ; winds ; {S}elf-organizing maps ; {BRESIL} ; {AMAZONIE} ; {AMAZONE} {BASSIN}},
  booktitle = {},
  journal = {{C}limate {D}ynamics},
  volume = {38},
  numero = {1-2},
  pages = {121--140},
  ISSN = {0930-7575},
  year = {2012},
  DOI = {10.1007/s00382-011-1010-8},
  URL = {https://www.documentation.ird.fr/hor/fdi:010054333},
}