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====== 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: <ksuzuki@aori.u-tokyo.ac.jp>

Xianwen Jing: <jing_xw@aori.u-tokyo.ac.jp>

Johannes Mülmenstädt: <johannes.muelmenstaedt@uni-leipzig.de>