====== Warm rain diagnostics (COSP and non-COSP) ====== =====Objective===== Warm rain statistics may provide a process-based observational constraint on parameterized precipitation in GCMs, specifically on the cloud lifetime effect. We have received base-state warm rain diagnostics from [[aerocom:warm-rain-diagnostics#Models participating so far|a number of models]], but it would be especially useful to see how the warm diagnostics respond to changes in the warm rain (autoconversion/accretion) parameterization. We would therefore like to piggyback on existing AeroCom experiments (e.g., the multi-model PPE) with as little extra work as possible required for the modeling groups. =====Required model diagnostics===== If you are interested in participating and are **COSP-enabled**, please see [[aerocom:warm-rain-diagnostics#COSP diagnostics|COSP diagnostics]]. If you **cannot run COSP**, we would still be delighted to receive [[aerocom:warm-rain-diagnostics#Non-COSP diagnostics|simpler, non-COSP, diagnostics]]. ====COSP diagnostics==== Consult the [[aerocom:warm-rain-cosp-table|COSP warm rain diagnostics table]]. ====Non-COSP diagnostics==== To participate, please save one of the following sets of diagnostics: - 3D snow and rain mixing ratios - 3D snow and rain fluxes - 2D snow and rain water paths The required time frequency is 6-hourly non-accumulated. If this is not feasible for the requested 3D fields, it is possible to implement the warm-rain fraction as an online diagnostic (with monthly-mean 2D output) in the model; please [[aerocom:warm-rain-diagnostics#Contact|contact Johannes]] for details. =====Models participating so far===== CAM5 (Contact: Shipeng Zhang, Minghuai Wang) SPRINTARS (Contact: Takuro Michibata, Toshi Takemura) IFS (Contact: Amund Søvde, Gunnar Myhre) HadGEM-UKCA (Contact: Tom Langton, Philip Stier) ECHAM-HAM (Contact: Johannes Mülmenstädt) =====Contact===== Kenta Suzuki: Xianwen Jing: Johannes Mülmenstädt: