UKCA Chemistry and Aerosol Tutorial 10

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What you will learn in this Tutorial

In this tutorial you will learn about the GLOMAP-mode aerosol module and how it tracks different aerosol types within several size classes. You will understand the standard configuration used in the UKCA jobs so far whereby the mass mixing ratios of sulphate, sea-salt, black carbon and organic carbon in each mode are transported via separate tracers. GLOMAP-mode is an aerosol microphysics scheme and therefore, as well as transporting the mass of several components in the modes, the scheme also transports the number concentrations of particles in each mode. In this task you will run a copy of the standard UKCA job with a different GLOMAP-mode configuration tracking two separate organic carbon components rather than the usual 1. With this 2-component OC configuration, the model tracks primary (emitted) organic carbon and secondary organic carbon (formed following oxidation in the atmosphere) separately.

Task 10.1: Understand how the GLOMAP aerosol module tracks aerosol species and modes

TASK 10.1: Read section 12 (page 32) of the UKCA UMDP and refer to Tables 18, 19 and 20 on pages 33, 34 and 35.

Task 10.2: Run the copy of the standard UKCA job tracking two OC components in the GLOMAP modes

Take a copy of the XXXXX job from the Tutorial experiment labelled two-component OC job and submit it for the 2-day run. Note that this uses the same branch as the standard job but allows you to run either the standard GLOMAP configuration in UKCA (MS2) or the two-component OC configuration (MS4).

Task 10.3 Examine the simulated total organic carbon in the original and two-cpt OC configurations

We recommend you use xconv for this task although you may prefer to use IDL.---- Written by Graham Mann 2014