P4 Regional Arctic System Model (RASM) Diagnostics – Mean and Diurnal Output for Regional Climate Simulations

Seefeldt, Mark W., Jose C. Ramirez, and John J. Cassano, University of Colorado, Boulder, and Cooperative Institute for Research in Environmental Sciences

The Regional Arctic System Model (RASM) Diagnostics is a new output option for WRF as of v3.9 with a focus on improving output load for regional climate simulations. The RASM Diagnostics provides time-step averaged output for surface meteorology fields, fluxes at the surface, and fluxes at the top of the atmosphere (TOA). The averaging period can be set by the user with some interval of seconds, minutes, hours, days, or a month. Additionally, diurnal averaging is provided which creates monthly averages for

three hour periods of time over the course of the day (00-03, 03-06, etc.). The intended application for the RASM Diagnostics is for regional climate simulations and the elimination of the need to produce the high-volume and I/O intensive instantaneous WRF history files for long duration simulations.