Abstract
A multi-experiment ensemble is performed using the WRF (Weather Research and Forecasting) model at high spatial resolution (1 km) over the Antisana glacier region (Ecuador), during the year 2005. Our goal is to identify the best model configurations to simulate atmospheric processes at diurnal and seasonal scales. The model is able to reproduce the complex zonal gradient of precipitation between the wet Amazon and the drier inter-Andean region. The main precipitation biases are (i) an overestimation in the afternoon (up to 6 mm/day) in the Antisana region related to local surface circulation patterns and (ii) a nighttime overestimation (up to 20 mm/day) in the Andes-Amazon transition zone associated with the regional circulation. Changing the microphysics scheme and/or the cumulus scheme primarily affect nighttime processes, while changing the topography forcing and activating slope radiation and shading options mostly affects afternoon processes. An adequate choice of the model configuration allows a correct representation of the diurnal cycle of precipitation, and in particular: (i) the mid-level easterly regional flow, (ii) the local moisture transport along and across the valleys, and (iii) the orographic mountain waves on the Antisana summit. For this specific area and year, the best configuration retained defined as “dSRTM_LRad” shows nighttime (daytime) precipitation biases smaller than 2 mm/day (3 mm/day); it is based on non-smoothed SRTM digital elevation model (dSRTM), Lin Purdue microphysics (L), and slope and shading radiation options (Rad). This 1-km resolution configuration requires the activation of the cumulus scheme, that improves the regional nighttime convection induced by the easterly regional flow on the Amazon-Andes transition region. It allows also a realistic strengthening of the daytime upward moisture transport. This study demonstrates that in the Antisana region, 1 km is a resolution still too coarse to deactivate cumulus schemes for a correct representation of cloud convection.
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Acknowledgements
This research was partly funded by the French AMANECER-MOPGA project funded by ANR and IRD (ref. ANR-18-MPGA-0008). The co-author M.B.H. was funded by the IRD program LMI GREATICE and the OSUG@2020 labex. The simulations presented in this paper were performed using the Froggy platform of the CIMENT infrastructure (https://ciment.ujf-grenoble.fr), which is supported by the Rhône-Alpes region (GRANT CPER07_13 CIRA), the OSUG@2020 labex (reference ANR10 LABX56), and the Equip@Meso project (reference ANR-10- EQPX-29-01) of the programme Investissements d’Avenir supervised by the Agence Nationale pour la Recherche. The authors thank Miguel Saavedra (IGP, Peru) for SRTM data, Sly Wongchuig (IGE) for helping with Fig. 1c, and INAMHI (Ecuador), EPMAPS (Ecuador), FONAG (Ecuador), Luis Maisincho and the Service National d’Observation GLACIOCLIM (CNRS-INSU, IRD, IPEV, INRAE, UGA) for the in situ stations data. The authors also thank Jennie Thomas, Nicolas Jourdain, Juan Pablo Sierra and other colleagues of IGE for exchange of ideas that have improved the quality of the research.
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Junquas, C., Heredia, M.B., Condom, T. et al. Regional climate modeling of the diurnal cycle of precipitation and associated atmospheric circulation patterns over an Andean glacier region (Antisana, Ecuador). Clim Dyn 58, 3075–3104 (2022). https://doi.org/10.1007/s00382-021-06079-y
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DOI: https://doi.org/10.1007/s00382-021-06079-y