@article{fdi:010092626,
  title = {{R}ecent changes in the dry-to-wet transition season in the {A}ndean {A}ltiplano and related atmospheric circulation patterns (1981-2022)},
  author = {{M}illa, {P}. and {E}spinoza, {J}han-{C}arlo and {G}utierrez-{V}illarreal, {R}. and {M}olina-{C}arpio, {J}. and {R}onchail, {J}. and {E}spinoza-{R}omero, {D}. and {J}unquas, {C}l{\'e}mentine},
  editor = {},
  language = {{ENG}},
  abstract = {{D}rought-related impacts in the southern {T}ropical {A}ndes are crucial for economic activities. {H}ere, precipitation decreases (p < 0.1) during the dry-to-wet transition season ({SON}) based on {CHIRPS} (1981-2023) and meteorological stations (1973-2016). {I}n addition, a decline in specific humidity and moisture flux is detected (1979-2022). {T}he precipitation trend is stronger (p < 0.05) in the southern {T}iticaca, {D}esaguadero, {P}oop & oacute; and {C}oipasa {S}alt {P}an hydrological system ({TDPS}) and extends southwards (20 degrees {S}-30 degrees {S}). {A} delayed onset and a reduced duration of the wet season are observed in the {TDPS} (p < 0.05), although precipitation intensifies during {DJF} in the southwestern {TDPS} (p < 0.05).{T}o analyze the atmospheric features related to these changes, we derive atmospherics circulation patterns ({CP}s) from standardized anomalies of daily 200-h{P}a winds (1979-2022) using a weather classification technique. {W}e identify 9 {CP}s, characterized by four 'dry' ({D}1, {D}2, {D}3, and {D}4), three 'wet' ({W}1, {W}2 and {W}3), and two 'transitional' patterns ({T}1 and {T}2). {D}uring {SON}, the frequency of the {W}1 ({D}3) is negatively (positively) correlated with the onset date of the wet season (p < 0.05). {T}hrough the period 1979-2022, the frequencies of the {D}3 and the predominantly dry {T}1 increase (p < 0.1 and p < 0.05, respectively). {C}onversely, {W}1 frequency diminishes substantially since 2010. {T}he physical mechanisms associated are discussed. {I}n conclusion, increased {D}3 and {T}1 frequencies, and decreased {W}1 are related to the diminution of precipitation during {SON} and to the shortening of the wet season length. {W}e also show that the extreme drought of 2022 was characterized by an unprecedented frequency of dry {CP}s, particularly during {N}ovember.},
  keywords = {{T}ropical {A}ndes ; {S}outh {A}merica ; {A}tmospheric circulation patterns ; {R}ainfall ; {I}nterannual variability ; {S}ub-seasonal variability ; {BOLIVIE} ; {PEROU} ; {CHILI} ; {ANDES} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{C}limate {D}ynamics},
  volume = {63},
  numero = {1},
  pages = {87 [22 p.]},
  ISSN = {0930-7575},
  year = {2025},
  DOI = {10.1007/s00382-024-07578-4},
  URL = {https://www.documentation.ird.fr/hor/fdi:010092626},
}