@article{fdi:010092961,
  title = {{I}nfluence of local topographic structures on the atmospheric mechanisms related to the {A}ndean-{A}mazon rainiest zone},
  author = {{G}utierrez-{V}illarreal, {R}. {A}. and {J}unquas, {C}l{\'e}mentine and {E}spinoza, {J}han-{C}arlo and {B}aby, {P}atrice and {A}rmijos, {E}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {A}ndes-{A}mazon transition region features critically important ecological services on the local, regional and global scales. {T}his region is among the rainiest zones in the world, with rainfall rates of up to 7000 mm/year. {H}owever, the physical mechanisms leading to the existence of these "precipitation hotspots" remain poorly known. {H}ere, we attempt to disentangle the controlling atmospheric mechanisms exerted by local topographic structures that started to uplift about 5-10 million years ago in response to the {N}azca {R}idge subduction, in the vicinity of the {Q}uincemil hotspot, the most intense of them. {W}e first use the {W}eather {R}esearch and {F}orecasting model to conduct sensitivity tests to planetary boundary layer parameterizations at 5 km horizontal grid spacing during the austral summer of 2012-13. {A}fter finding the most suitable configuration in terms of the diurnal cycle of rainfall intensity and extent, we further perform topographic sensitivity tests by reducing the {F}itzcarrald {A}rch lowlands and, on top of it, by removing the {C}amisea mountain. {T}he {F}itzcarrald {A}rch deflects moisture flux towards {Q}uincemil, while the {C}amisea mountain induces local vortical circulations that increase moisture transport, convergence and rainfall over {Q}uincemil, ultimately controlling its location and intensity by up to 40 %. {W}hen reducing the height of the {A}ndes in half, we find that it sustains the development of precipitation hotspots, accounting for up to 60 % of rainfall, by providing a mechanical forcing to increase regional-scale moisture fluxes. {S}uch mechanisms dominate during nighttime, when rainfall peaks in the region, and might explain the existence of the rainiest zone in the {A}ndes-{A}mazon transition.},
  keywords = {{P}recipitation hotspots ; {A}ndes-{A}mazon transition region ; {WRF} model ; {T}opography ; {S}ensitivity experiments ; {P}eru ; {PEROU} ; {ANDES} ; {AMAZONIE}},
  booktitle = {},
  journal = {{A}tmospheric {R}esearch},
  volume = {320},
  numero = {},
  pages = {108068 [17 p.]},
  ISSN = {0169-8095},
  year = {2025},
  DOI = {10.1016/j.atmosres.2025.108068},
  URL = {https://www.documentation.ird.fr/hor/fdi:010092961},
}