# Presentation: 923887

## CMIP Integrations and Vertical Diffusion

- Suru Saha made several CMIP runs, including
- --cmip1 coupled integration with operational CFS
- --cmip6 coupled integration with operational GFS
- 	(changes to diffusion, mountain forcing, NOAH
- 	land model, RTM long wave)
- --monin cmip6 without changes to diffusion
- --GFS-Monin effect of removing vertical diffusion
- All T126, 64 levels
- 				Glenn.White@noaa.gov

## Monin-cfs

- Cooling due to changes in vertical diffusion
- Cooling develops gradually in cmip6

***Monin-cfs***

***GFS-CFS***

***GFS-monin***

- Effect of removing vert diff in free atmos

***Zonal mean 2 meter T***

## CFS

- All 3 runs show 2-m cooling after first year

***CFS***

***GFS***

***Monin***

- Zonal mean 2-meter T drift from 1st year of integration

## GFS-Monin

- More cooling over land than ocean

***GFS-Monin***

***Effect of removing vertical diffusion***

**Land**

**Ocean**

**50N**

***30N***

## Monin-CFS

- CMIP6 less dsw at surface from 1st year

***Monin-CFS***

***GFS-CFS***

***Effect of removing diffusion***

***Zonal mean dsw sfc***

## Difference in dsw greater over ocean than land

***Difference in dsw greater over ocean than land***

***Effect of removing vertical diffusion in free atmosphere***

***Land***

***Ocean***

## Monin-CFS

**Monin-CFS**

**GFS-CFS**

***Removing vertical diffusion***

***Zonal mean usw sfc***

## Monin-CFS

***Monin-CFS***

**GFS-CFS**

**Removing vertical diffusion**

- Removing vertical diffusion means less nsw at surface

***Zonal mean nsw sfc***

## Monin-CFS

**Monin-CFS**

**GFS-CFS**

**GFS-Monin**

***Zonal mean dlw sfc***

## Monin-CFS

**Monin-CFS**

**GFS-CFS**

**GFS-Monin**

***Zonal mean ulw sfc***

## Monin-CFS

**Monin-CFS**

**GFS-CFS**

**GFS-Monin**

- Negative—cooling of surface
- Positive—warming of surface

***Zonal mean nlw sfc***

## Monin-CFS

- Both monin and cmip6 more cloud than cmip1, but monin warmer than cmip1 and little difference in dsw at surface

**Monin-CFS**

**GFS-CFS**

**GFS-Monin**

***Zonal mean total cloud***

## Monin-CFS

- GFS-CFS

- GFS-Monin

***Zonal mean low cloud***

## Monin-CFS

**Monin-CFS**

**GFS-CFS**

**GFS-Monin**

**Zonal mean bdry clouds**

## Monin-CFS

**Monin-CFS**

**GFS-CFS**

**GFS-Monin**

***T2m 2011***

## CFS

**CFS**

**GFS**

***Monin***

**GFS-Monin**

## GFS-Monin

- Effect of removing vertical diffusion

***GFS-Monin***

**Dsw sfc**

**USW Sfc**

**T2m**

**NSW sfc**

**2011**

## GFS-Monin 2011

***GFS-Monin 2011***

**DLW SFC**

**ULW SFC**

**NET SFC RAD**

**NLW SFC**

## GFS-Monin Clouds 2011

***GFS-Monin Clouds 2011***

**HIGH**

**LOW**

**TOTAL**

**BDRY**

## --Removing vertical diffusion in free atmosphere leads to less downward short wave at surface, more clouds, cooler 2-meter T

***-New system with and without vertical diffusion increases cloudiness over old system (CFS)***
***-New system with and without vertical diffusion warmer in polar regions—changes in ice?***
***-New system without vertical diffusion warmer at 2 meters than old system, even though it has more clouds***

## Monin-CFS

**Monin-CFS**

**GFS-CFS**

**Monin-CFS**

**GFS-CFS**

***Diabatic heating***

***Clouds***

## Monin-CFS

**Monin-CFS**

**GFS-CFS**

**Monin-CFS**

**GFS-CFS**

***Short Wave***

***Long wave***

## Convective heating

**Monin-CFS**

**GFS-CFS**

**Monin-CFS**

**GFS-CFS**

***Convective heating***

***Shallow convection***

## Monin-CFS

**Monin-CFS**

**GFS-CFS**

**Monin-CFS**

**GFS-CFS**

***Large-Scale Heating***

***Vertical diffusion***