Moisture sources of precipitation using convection‐permitting simulations: A study over South America
Claros, E., Dominguez, F., Liu, C.. (2025). Moisture sources of precipitation using convection‐permitting simulations: A study over South America. Geophysical Research Letters, doi:https://doi.org/10.1029/2025gl118806
| Title | Moisture sources of precipitation using convection‐permitting simulations: A study over South America |
|---|---|
| Genre | Article |
| Author(s) | E. Claros, F. Dominguez, Changhai Liu |
| Abstract | Climatological analyses of moisture sources of precipitation have traditionally relied on reanalyses or models that parameterize convection. Convection-permitting models (CPMs) are increasingly used in climate studies, as they better represent many precipitation processes than non-CPMs. We found significant differences in precipitation moisture sources over the Amazon Basin using 1-year CPM and non-CPM WRF simulations with moisture tracers. Notably, the CPM estimates that about half of precipitation in the central Andes comes from the Amazon basin; a 20%–30% higher estimate than the non-CPM. This suggests long-term CPMs with tracers could improve climatological estimates. However, their high computational cost is prohibitive. To overcome this, we developed a revised 2L-DRM model that replicates CPM-with-tracers estimates at a fraction of the cost, using only standard outputs. We applied this model to South America, analyzing precipitation moisture sources across 15 regions. 2L-DRM can be used for other regions as continental-scale CPM climatological simulations become available. |
| Publication Title | Geophysical Research Letters |
| Publication Date | Dec 16, 2025 |
| Publisher's Version of Record | https://doi.org/10.1029/2025gl118806 |
| OpenSky Citable URL | https://n2t.net/ark:/85065/d70g3qpr |
| OpenSky Listing | View on OpenSky |
| RAL Affiliations | HAP |