Assessing long-term climatology of convection permitting simulation of precipitation and associated local circulation over southeastern South America

DA ROCHA, R.P.; DA SILVA, LEIDINICE; BETTOLLI, MARIA LAURA; REBOITA, M; LLOPART, M.

Viena

Conferencia; EGU 2023; 2023

EGU

The convection permitting (CP) version of Regional Climate Model (RegCM) has been applied to investigate extreme events in southeastern South America in the context of CORDEX collaborative network Flagship Pilot Studies. In this context, we developed a long-term RegCM simulation (from June 2018 to June 2021) at CP resolution (4 km of horizontal grid spacing). RegCM simulation was forced by ERA5 reanalysis and its domain extends from center to southeast (from ~ 15o to 35oS) of South America. In this assessment, simulated daily climatology was compared with both ERA5 reanalysis and with a great number of local stations. These comparisons will help us to understand if CP simulation aggregates relevant information to the ERA5 reanalysis in reproducing local aspects of the climate. Using the winds from stations, the ability of CP simulation in reproducing the local circulations, such as sea-breeze, is also investigated. We also discuss how well long-term CP simulation captures long dry and wet periods that were observed in southeastern South America.