@article{fdi:010053111,
  title = {{W}eather regimes over {S}enegal during the summer monsoon season using self-organizing maps and hierarchical ascendant classification. {P}art {I} : synoptic time scale},
  author = {{G}u{\`e}ye, {A}. {K}. and {J}anicot, {S}erge and {N}iang, {A}. and {S}awadogo, {S}. and {S}ultan, {B}enjamin and {D}iongue-{N}iang, {A}. and {T}hiria, {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he aim of this work is to define over the period 1979-2002 the main synoptic weather regimes relevant for understanding the daily variability of rainfall during the summer monsoon season over {S}enegal. "{P}ure" synoptic weather regimes are defined by removing the influence of seasonal and interannual time scales, in order to highlight the day by day variability of the atmospheric circulation. {T}he {S}elf-{O}rganizing {M}aps ({SOM}) approach, a clustering methodology based on non-linear artificial neural network, is combined with a {H}ierarchical {A}scendant {C}lassification to compute these regimes. {N}ine weather regimes are identified using the mean sea level pressure and 850 h{P}a wind field as variables, and gathered into three classes. {T}wo of these weather regimes represent the classical 3-5-day {A}frican easterly waves with a mean wavelength of about 3,000 km. {T}hree others are characterized by a modulation of the semi-permanent trough located along the western coast of {W}est {A}frica and might be interpreted in terms of the 6-9-day easterly waves. {T}he last four weather regimes are characterized by a more or less strong north south dipole of circulation. {T}hey can be interpreted as a northward/southward displacement of the {S}aharan {H}eat {L}ow for two of them, and a filling/deepening of this depression for the other two. {T}he circulation patterns of all these nine weather regimes are very consistent with the associated anomaly patterns of precipitable water, mid-troposphere vertical velocity, outgoing longwave radiation, and finally rainfall. {R}ainfall distribution is also highlighted over the southwestern area of {S}enegal.},
  keywords = {{W}eather regimes ; {S}enegal ; {S}elf-{O}rganizing {M}aps ; {H}ierarchical {A}scendant ; {C}lassification},
  booktitle = {},
  journal = {{C}limate {D}ynamics},
  volume = {36},
  numero = {1-2},
  pages = {1--18},
  ISSN = {0930-7575},
  year = {2011},
  DOI = {10.1007/s00382-010-0782-6},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053111},
}