Commits on Dec 25, 2021

1. Adding Ristic microphysics scheme …

   TYPE: New feature
   
   KEYWORDS: microphysic, forecast, cloud, precipitation
   
   SOURCE: Ivan Ristic (Weather2 - www.weather2.rs)
   
   DESCRIPTION OF CHANGES:
   In order to improve cloud and precipitation forecast we developed new cloud prediction scheme and we implemented it in WRF model. Fractional cloud cover, cloud liquid water, cloud ice and cloud snow are explicitly predicted by adding three
   prognostic equations for fractional cloud cover, cloud mixing ratio and snow per cloud fraction to the model. Sedimentation of ice and snow is also included in parameterization. Precipitation of rain and snow are determined from cloud fields. Clouds predicted like this can be used also in radiation parameterization.
   
   Thermodynamic wet bulb temperature will be used for describing clouds because it is constant during water phase changes. By using this temperature moist static energy of model grid box and cloudy part inside the grid box is the same and principle of energy conservation is satisfied.
   
   A complete description is now found in Ristic I., Kordic I., 2018: Cloud parameterization and cloud prediction scheme in the Eta numerical weather model. NWCM - Serbian Academy of Sciences and Arts which can be found at https://www.sanu.ac.rs/wp-content/uploads/2018/10/11_Cloud%20parameterization%20and%20cloud%20prediction%20scheme%20in%20Eta%20numerical%20weather%20model.pdf .
   
   LIST OF MODIFIED FILES:
   modified:   Registry/Registry.EM_COMMON
   modified:   dyn_em/solve_em.F
   modified:   phys/Makefile
   modified:   phys/module_microphysics_driver.F
   new file:   phys/module_mp_ivanr_micro.F
   
   TESTS CONDUCTED:
   All the wrf-coop tests passed and the microphysics is being actively used for running a model with NMM.
   Integration of the model for test cases indicate that new cloud prediction scheme improved forecast compared to the original model. New fractional cloud cover formula showed good results in practice, since the fractional cloud cover, predicted in this way, was much closer to the real cloud cover values. Significant progress has been made in stratiform precipitation forecast. Positive impact on convection scheme is also noticed.
   One test was run on 17. November 2011 with the  Wrf model with ECMWF as boundary data. Model run for 72 hours in horizontal resolution of about 22 km and vertical resolution of 38 layers for the Europe domain. Fog was first to be tested.
   ![image](https://user-images.githubusercontent.com/51482208/97575741-7b35d080-19ed-11eb-8310-fc6a6e3c5ac8.png)
   ![image](https://user-images.githubusercontent.com/51482208/97576039-f303fb00-19ed-11eb-8410-7736be350b6d.png)
   
   The second test was run on 24. June 2015 with Wrf model with ECMWF as boundary data. Model was run for 24 hours in
   horizontal resolution of about 22 km and a vertical resolution of 38 layers for the Europe domain. The second test situation tested  mid-morning precipitation over northern Serbia.
   ![image](https://user-images.githubusercontent.com/51482208/97577542-dff22a80-19ef-11eb-9a86-e4d3b0a05e10.png)
   
   More details can be found in the aforementioned pdf file.
   
   RELEASE NOTE: Ivan Ristic: Custom implementation of microphysics

   

   Nikolar97 authored and davegill committed Dec 25, 2021
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2. Adding descriptions of custom fields

   

   Nikolar97 authored and davegill committed Dec 25, 2021
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