Wednesday

2.

At which of these grid sizes would you most likely NOT use cumulus parameterization?

1 km
10 km
100 km

Correct Answer

A. 1 km

Explanation

Cumulus parameterization is recommended for domains with a grid size greater than or equal to 10 km. You likely would not need to use cumulus parameterization below 3 km. In between 3 and 10 km, you would need a cumulus scheme that's aware of the smaller grid sizes.

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3.

Which of these statements is FALSE?

You should use a microphysics scheme for any grid size
You should only use a microphysics scheme when you don't use a cumulus scheme
You can use microphysics and cumulus schemes on the same domain

Correct Answer

A. You should only use a microphysics scheme when you don't use a cumulus scheme

Explanation

A cumulus scheme considers atmospheric conditions that are conditionally unstable and sub-saturated, while a microphysics scheme is only active in a grid volume that's saturated.

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4.

Which type of physics should you consider changing in multiple nested domains?

Land surface model
Cumulus scheme
Planetary boundary layer physics
Microphysics

Correct Answer

A. Cumulus scheme

Explanation

Cumulus schemes are designed for grid spacing large enough that cumulus clouds are consistent to occupy only a portion of the grid box, hence when the grid size becomes smaller, the scheme may be replaced by explicit clouds on the grid.

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5.

Which of these is a FALSE statement for land points?

The PBL scheme gets its heat flux from the LSM
The PBL scheme gets its moisture flux from the LSM
The PBL scheme gets its surface friction from the LSM
The PBL scheme gets its surface friction from the surface-layer scheme

Correct Answer

A. The PBL scheme gets its surface friction from the LSM

6.

Which of the following is/are required to build the WRF model?

A C compiler
A Fortran compiler
The netCDF library
All of the above

Correct Answer

A. All of the above

7.

Which circumstance(s) would require you to issue a 'clean -a' and reconfigure, prior to recompiling the code?

You are compiling with a different compiler
You made some edits to a physics routine
You made some modifications to the registry file
A and b
A and c
All of the above

Correct Answer

A. A and c

Explanation

Any time you make modifications to your configuration - using a different compiler, netcdf, versions, paths, setting new environment variables you would like to incorporate into your compilation, or when you make modifications to the registry files, you must clean and reconfigure before recompiling. If you only make modifications to any other files (e.g., physics routines), you can simply issue the compile command, and it should not take nearly as long as a full compile.

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Wednesday

In model output RAINNC is:

Quiz Preview

At which of these grid sizes would you most likely NOT use cumulus parameterization?

Which of these statements is FALSE?

Which type of physics should you consider changing in multiple nested domains?

Which of these is a FALSE statement for land points?

Which of the following is/are required to build the WRF model?

Which circumstance(s) would require you to issue a 'clean -a' and reconfigure, prior to recompiling the code?