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 a copy of the standard UKCA job which tracks two OC components in the GLOMAP modes

Take a copy of the xjluc (owner gmann) job from the UMUI and change the settings to be run by you. This xjluc is identical to the 2-day UKCA tutorial job from the earlier exercises but uses the 2-component OC GLOMAP configuration. The job xjlub is the UKCA tutorial job with the standard GLOMAP configuration.

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