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To fundamentally address the over-deposition bias in dust, it requires some surgical change in the code - the aerosol turbulence transport term needs to be moved from CLUBB and add to the aerosol emission/deposition equation. This issue might also need affect other aerosols and water vapor, which probably requires extensive model evaluation. In view of the timeline for the V2, a simple fix is thus proposed. We will implement an alternative option that distribute dust evenly in the PBL, instead of the lowest model layer. As insufficient dust transport is common in large-scale models for various reasons, similar approaches have been adopted in other modeling studies to enhance the dust vertical transport. We propose to implement this simple fix as an option in the namelist so that we will have a short-term solution, while we are working on a more physically-based solution.

Requirements

Requirement: (1) update namelist options in the default compset; (2) update size distribution of dust emission fluxes; (3) update the dust emission

height 

distribution in the boundary layer

Date last modified: 2019-

05

06-

13

27
Contributors: Yan Feng

The first two updates have been implemented and tested in V1. The third update is implemented and tests are not completed.

Requirement: ..

.

.....

Date last modified: 
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.....description.....

.....reference......

Algorithmic Formulations, and Design Implementation


Design Solution:

......

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Design Solution: ......


(1) namelist change in &cam_inpam: dust optics and dust_emis_fact

(2) dust_model.F90: change fractional emissions in size bins

Date last modified:

 

2019-06-27
Contributors:

 

.....description.....

.....reference.....

 

Yan Feng


Planned Verification and Unit Testing 

Verification and Unit Testing: .......

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N/A


Planned Validation Testing 

Validation Testing: 

........


Implemented the new parameters and ran sensitivity simulations with V1. Evaluate the model outputs with observations

Date last modified:

 

2019-06-27
Contributors:

 

.....description.....

.....reference.....

Planned Performance Testing 

Performance Testing: .........

Date last modified: 
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Yan Feng

Table 1 list the model sensitivity studies and configurations.


Horizontal resolution

Vertical layers

Physics configuration

Dust emission size distribution

SW optics

Global scaling factor
LRes

ne30

72

FC5AV1C-04P2

Default

Default

2.05
LResTN

ne30

72

FC5AV1C-04P2

Kok (2011)

AERONET

0.95

LResTNs

ne30

72

FC5AV1C-H01A

Kok (2011)

AERONET

0.95


Planned Performance Testing 

No changes in performance