Difference between revisions of "UKCA Chemistry and Aerosol Tutorial 1"
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| − | [[UKCA Chemistry and Aerosol Tutorials | Back to UKCA Chemistry and Aerosol Tutorials]] |
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| − | |||
| − | ==What you will do in this tutorial== |
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| − | In this tutorial you will now take a copy of a UKCA job and send it to compile and run on the supercomputer. While this is going on we will explore various UMUI panels that you may find useful in your future work with UKCA. This can be done as fast or as slowly as you like, although future tutorials will assume that you have a general knowledge of the UMUI. |
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| − | |||
| − | ==Exploring the UMUI== |
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| − | |||
| − | ===Getting hold of an existing UM-UKCA job=== |
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| − | |||
| − | Before you can start using UKCA (and the UM generally), you first need to copy a UM or UKCA job from somewhere. You may be given a job from someone for a specific purpose, or you may just copy a standard job. In the UMUI there are two repositories of standard jobs, under the '''umui''' and '''ukca''' UMUI users. The '''umui''' user contains a series of standard jobs provided and maintained by NCAS-CMS. The '''ukca''' user contains jobs provided by the UKCA team. |
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| − | |||
| − | ====Task 1.1: Copy a UM-UKCA job and then run it==== |
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| − | |||
| − | More details on how to copy UMUI jobs can be found in the NCAS-CMS [http://cms.ncas.ac.uk/wiki/UmTraining/IntroToUMUI Introduction to the UMUI] tutorial video. |
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| − | |||
| − | <span style="color:green">'''TASK 1.1:''' Make a new experiment and take a copy of the UKCA Tutorial Base Job, filter for the '''ukca''' user and choose the correct experiment for the machine that you will be running on (ARCHER: <span style="color: red">'''x???'''</span>, MONSooN: <span style="color: red">'''x???'''</span>). Select the '''a''' job, labeled '''''Tutorial: Base UM-UKCA Chemistry and Aerosol Job''''' and copy this one to your own experiment.</span> |
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| − | |||
| − | <span style="color:green">Now take your copy of the Tutorial Base Job and make the required changes to allow this job to run. Once you have made these changes you can submit your job. First click '''Save''', then '''Process''', and once this has completed, click '''Submit'''. This will then extract the code from the FCM repositories and submit them to the supercomputer. If you are running on MONSooN you will need to enter your passcode at this stage.</span> |
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| − | '''Note:''' To allow the jobs in this tutorial to run quickly this job is only set to run for 2 days. This means that there will be no '''climate-mean''' files produced (see the [[UKCA_&_UMUI_Tutorial_3#Climate_Mean_files | what is STASH?]] tutorial '''INSERT CORRECT LINK HERE''') produced, which require run lengths of a month or more. |
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| − | |||
| − | ===What is the UMUI?=== |
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| − | |||
| − | The UMUI is the ''Unified Model User Interface''. It is used to configure UM model options and parameters, and, for climate simulations, is also used to manage submission of the job to the supercomputer. As well as inserting values into the Fortran namelists used by the model, it also checks the logical of those choices. It is also possible to add variables into the namelists directly using '''hand-edits''', which will be discussed in more detail in the [[UKCA & UMUI Tutorial 4 | adding new chemical tracers]] tutorial ('''INSERT CORRECT LINK HERE'''). |
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| − | The UMUI itself is rather complicated, with many different panels, but no search function. Without experience it can be difficult to find which panels are useful. While this tutorial will go through many of the panels that are useful or relevant to using UKCA, it is recommended that you take some time to familiarise yourself generally with the UMUI. |
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| − | This list is not exhaustive, but should be useful as a reference. Only the panels that are directly relevant to configuring and running UKCA jobs will be discussed in any detail. |
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| − | ====Task 1.2: Explore your new job==== |
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| − | <span style="color:green">'''TASK 1.2:''' Open your job and browse around it as you read through the list below.</span> |
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| − | '''Note:''' It is very easy, when exploring a UMUI job, to accidentally make a change. For this reason if you don't want to change anything on a panel it is best to exit by using the '''abandon changes''' button, rather than the '''close''' button (as this will save any accidental changes that you may have made). |
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| − | If in later tutorials you find that you are having problems running you job, you may have accidentally made changes to it while you look through the UMUI now. You can see if this is the case by '''differencing''' your job with the original '''a''' job that you copied (''Tutorial: Base UM-UKCA Chemistry Job''). To do this you first need to '''Search → Filter...''' for both your experiment and the [[UKCA Chemistry and Aerosol Tutorials: Things to know before you start#PUMA and ARCHER/MONsooN | UKCA Tutorial experiment]], then go to '''Job → Difference''' and select '''Long'''. The only differences between these jobs should be in the '''Model Selection → User Information and Submit Method → General details''' (called '''personal_gen''' in the difference window) where you have changed your user-name, email address, and TIC-code. |
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| − | If you have had problems and have had to revert the job to the original '''a''' job, you may find that you need to clear all the directories that have been produced on the supercomputer. On ARCHER you may need to remove the |
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| − | /home/n02/n02/<span style="color:blue">userid</span>/um/<span style="color:blue">jobid</span> |
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| − | /work/n02/n02/<span style="color:blue">userid</span>/um/<span style="color:blue">jobid</span> |
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| − | directories, and on MONSooN you may need to remove the |
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| − | /projects/<span style="color:red">group</span>/<span style="color:blue">userid</span>/um/<span style="color:blue">jobid</span> |
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| − | /nerc/<span style="color:red">group</span>/<span style="color:blue">userid</span>/<span style="color:blue">jobid</span> |
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| − | directories. |
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| − | '''Sample output''' from this job can be found in |
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| − | /work/n02/n02/ukca/Tutorial/vn8.4/sample_output/Base/ |
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| − | on ARCHER, and in |
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| − | /projects/ukca/Tutorial/vn8.4/sample_ouput/Base/ |
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| − | on MONSooN. |
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| − | ==The UMUI: Quick Reference== |
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| − | |||
| − | ===The Main Window and the Interface Bar=== |
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| − | When you start-up the UMUI you will be given a list of all your experiments. Along the top of this window there is a bar which gives a number of useful options |
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| − | |||
| − | ====Search==== |
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| − | The '''Filter''' option is very useful. This allows you to filter UMUI jobs by user, experiment ID, version etc. You will mostly be copying a job from another user (as you have done for this tutorial) and so will need to use the search function for this. |
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| − | |||
| − | ====Experiment==== |
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| − | This menu is used primarily to make a '''New''' experiment. It is advisable to use different experiments for different studies, as keeping multiple studies in a single experiment can become confusing. Each experiment has a unique 4-letter identifier, and you can have up to 26 jobs under each experiment, labelled a-z. |
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| − | |||
| − | ====Job==== |
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| − | You will often use the Job menu to '''Copy''' jobs from other users experiments, as described in the NCAS-CMS [http://cms.ncas.ac.uk/wiki/UmTraining/IntroToUMUI Introduction to the UMUI] tutorial video. Another useful function is the '''Difference''' option, which allows you to compare, in detail, two different UMUI jobs (of the same UM version). |
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| − | You can also use this menu to change the '''job description''' text or the '''job identifier''' (i.e. the a-z label) within the experiment. |
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| − | If the UMUI is not closed down correctly, when you start it again and try to edit an existing job which you had open when the UMUI crashed you will get an error message telling you that the job is already open. In this case you can '''Force Close''' the job from this menu. |
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| − | There is also a '''Help''' menu which may be useful. |
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| − | |||
| − | ===Navigating a Job=== |
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| − | [[Image:Vn8.4_Job_Explore_01.png|thumb|right|Figure 1: A UMUI Job showing the Input/Output Control and Resources options.]] |
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| − | When you open a job from the UMUI, either as read-write or as read-only, you are given a new window with several buttons along the bottom and a single tab labeled ''Model Selection''. Clicking on this tab will give you a number of options, and we will go over the more relevant of these below. |
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| − | ====User information and Submit Method==== |
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| − | |||
| − | =====General details===== |
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| − | In this panel you will set your user-id on the remote supercomputer (the '''$USERID''' variable), your email address (which may be different from your user-id), and the accounting (or ''TIC'') code. These changes will also have been covered in the NCAS-CMS [http://cms.ncas.ac.uk/wiki/UmTraining/IntroToUMUI Introduction to the UMUI] tutorial video. |
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| − | |||
| − | =====Job submission method===== |
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| − | This panel determines what computer you will be running on, and how long the NRUN step (see information on the ''Compile and Run Options'' below) will request in the supercomputer queue. To access this information you will need to select either '''LoadLev''' (for MONSooN) or '''Qsub''' (for ARCHER). |
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| − | It is unlikely you will need to change any information in this panel. |
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| − | |||
| − | ====Input/Output Control and Resources==== |
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| − | =====Output Choices===== |
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| − | In this window you can change the level information given by the output messages that are placed in the mode output '''.leave''' file (for more information on this file, see the [[UKCA & UMUI Tutorial 3 | running existing UKCA Job]] tutorial ('''INSERT CORRECT LINK HERE''')). |
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| − | =====Time Convention and SCRIPT Environment Variables===== |
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| − | Often the directory containing an input ancillary file is not specified explicitly, but is instead specified using an environment variable (e.g. <code>$UKCA_EMISS</code>). These environment variables are set here. |
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| − | This panel also defines the directories where the job will be run from, <code>$DATAM</code> and <code>$DATAW</code>. |
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| − | |||
| − | =====Start Date and Run Length Options===== |
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| − | A simple panel where the start date of the run and the number of years, months, days, etc of the run is set. It is best to use, e.g. 1 month rather than 30 days, or 1 year rather than 12 months. |
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| − | |||
| − | =====Re-submission pattern===== |
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| − | This panel sets whether or not re-submission is used (for most jobs over a few months in length, re-submission will always be used) and how long that job-step has requested in the queue on the supercomputer. This number may be different to that set in the ''User information and Submit Method → Job submission method'' window. |
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| − | ====FCM Configuration==== |
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| − | |||
| − | =====FCM Extract directories and Output levels===== |
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| − | This panel contains the directory that your source code will be extracted to, prior to compilation (the '''UM_ROUTDIR''' field). You may need to change this field. For ARCHER users this should be something like |
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| − | /home/n02/n02/$USERID/um |
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| − | as you should to extract to <tt>/home</tt> and not <tt>/work</tt>. For MONSooN users it is often the same as the directory your job will run from, which will be similar to |
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| − | /projects/<span style="color:red">group</span>/$USERID/um |
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| − | (setting the name of your MONSooN project <span style="color:red">group</span> as appropriate). Note that you will have already set the <tt>$USERID</tt> value in the '''User Information and Submit Method → General details''' panel. |
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| − | In this panel you can also force FCM to run a full extract and build of an existing directory, rather than just doing incremental extracts. |
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| − | =====FCM Options for Atmosphere and Reconfiguration===== |
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| − | This panel tells the UM which branches from the FCM repository to include in the build, or if you want to take source code from a working copy on PUMA. When you are adding new source code you will need to make changes here. |
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| − | ====Compilation and Run Options==== |
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| − | =====Compile and run options for Atmosphere and Reconfiguration===== |
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| − | [[Image:Vn8.4_Job_Explore_03.png|thumb|right|Figure 2: The compilation options window.]] |
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| − | An example of this window can be seen in Figure 2. This window is used to tell the UMUI if you want to compile and/or run the model. If you are just running the model you can also select a '''CRUN''' (''continuation run'') step, which is done during the automatic re-submission. |
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| − | This window gives the option to run the reconfiguration step or not. Reconfiguration will be discussed in more detail below. |
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| − | |||
| − | =====UM User Override Files===== |
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| − | In this panel you can define over-ride files which are used to change the compiler flags for some (or all) source files. It may be that you need to change the optimisation level of a routine, for example, and this is done here. |
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| − | ====Reconfiguration==== |
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| − | The reconfiguration step is used to create the initial conditions (''.astart'') file for the atmosphere model. Often this is done by supplying an existing restart (or ''dump'') file produced by another model run. If no changes need to be made to this file then the reconfiguration step does not need to be run, but if anything does need to be done, such as changing the year of the dump file, or inserting a new field (as will be done in the [[UKCA & UMUI Tutorial 4 | adding new chemical tracers]] tutorial ('''INSERT CORRECT LINK HERE''')) then this step needs to be performed. |
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| − | |||
| − | =====General Reconfiguration Options===== |
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| − | If reconfiguration has been requested in the ''Compilation and Run Options → Compile and run options for Atmosphere and Reconfiguration'' panel, then you can set more switches here, such as changing the year in the file. More reconfiguration options are also set in ''Atmosphere → Ancillary and input data files → Start dump''. |
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| − | ====Post Processing==== |
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| − | More information on the ''Initialization and processing of mean & standard PP files'' panel will be covered in the [[UKCA & UMUI Tutorial 3 | What is STASH?]] tutorial ('''INSERT CORRECT LINK HERE'''). |
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| − | |||
| − | =====Main Switch + General Questions===== |
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| − | This panel covers post-processing to be applied to a job as it runs, such as deleting superseded files, and the '''[[UKCA Chemistry and Aerosol Tutorials: Things to know before you start#Archiving|archiving]]''' of data to various places, depending on the supercomputer. On MONSooN this can be used to send data to the <tt>/nerc</tt> disk. |
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| − | |||
| − | ====Atmosphere==== |
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| − | The atmosphere tab is used to control the majority of the settings in the UM model, and so it is divided into a number of sub-levels. A few of the most relevant to UKCA are discussed below. |
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| − | =====Model Resolution and Domain → Vertical===== |
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| − | This panel gives the location (on the supercomputer) of the namelist giving the specification of the level structure. You will need this file to use with [http://cms.ncas.ac.uk/documents/xancil/ Xancil] when producing 3D ancillary and initial condition files. Xancil will be discussed in more detail in the [[UKCA & UMUI Tutorial 5 | adding new emissions]] tutorial ('''INSERT CORRECT LINK HERE''') and in the [[Using Xancil]] page.. |
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| − | =====Model Configuration → UKCA Chemistry and Aerosols===== |
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| − | This is a link to the UKCA panel (which can also be found in ''Atmosphere → Scientific Parameters and Sections → Section by section choices → Section 34: UKCA Chemistry and Aerosols''). This will be dicussed in detail [[UKCA & UMUI Tutorial 1#The UKCA Panel | below]]. |
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| − | =====Scientific Parameters and Sections → Section by section choices===== |
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| − | The panels in this menu contain a large number of the UM sections (including UKCA) and various options for each of these sections can be selected, and viewed, by clicking on the required tab, e.g. ''Section 1: SW Radiation'' etc. |
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| − | =====Scientific Parameters and Sections → Spec of trace gases===== |
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| − | The panels in this menu allow the values of the trace gases of CH4, N2O, CFC-11, CFC-12, CFC-113, CFC-114, HCFC-22, HFC-125, HFC-134a, and CO2 to be set for use in the radiation scheme. Depending on settings in the [[UKCA & UMUI Tutorial 1#The UKCA Panel | UKCA panel]], UKCA can use these values as the lower boundary conditions for the mixing ratios. |
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| − | |||
| − | =====Ancillary and input data files → Start dump===== |
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| − | In here you set the original restart ('''dump''') file that is read-in by the model, and the type of interpolation that will be applied to it, if it doesn't match the existing model resolution (i.e. it is possible to initialise a N96L85 model with a N48L60 start dump). |
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| − | |||
| − | =====Ancillary and input data files → In file related options===== |
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| − | The '''Ancillary version files''' is used to define two files which give a set of standard names and locations of input ancillary files, which are then used in the '''Ancillary and input data files → Climatologies & potential climatologies''' sections. |
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| − | =====Ancillary and input data files → Climatologies & potential climatologies===== |
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| − | This menu lists all the possible ancillary files that are read-in by the model. Key ones are the '''sea surface temperatures''' and '''sea ice fields''', where the SSTs and Sea-Ice ancillaries are specified. At UM8.2 you may find that the directory and file name are both environment variables (e.g. <tt>$UM_ANCIL_SST_DIR</tt> and <tt>$UM_ANCIL_SST_FILE</tt>). These are set in the ''Ancil versions'' and ''Ancil filenames'' files which are set in the '''Ancillary and input data files → In file related options → Ancillary version files''' panel. |
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| − | UKCA emissions are held in the '''user multi-level ancillary file & fields''' (for 3D emissions, e.g. aircraft NOx) and '''user single-level ancillary file & fields''' (for surface emissions, e.g. CO etc.). It is standard to have an update time of 5 days for these emissions (for monthly mean data). |
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| − | |||
| − | =====Ancillary and input data files → Other ancillary files and Lateral Boundary files===== |
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| − | In this menu you will find the '''orography''', '''land-sea-mask''', and '''land fraction''' file specifications. |
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| − | =====STASH===== |
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| − | STASH will be discussed in more detail in the [[UKCA & UMUI Tutorial 3 | what is STASH?]] tutorial ('''INSERT CORRECT LINK HERE'''). |
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| − | |||
| − | ====The UKCA Panel==== |
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| − | The UKCA panel can be found in two ways, either by going to '''Atmosphere → Model Configuration → UKCA Chemistry and Aerosols''' or '''Atmosphere → Scientific Parameters and Sections → Section by section choices → Section 34: UKCA Chemistry and Aerosols'''. This contains a number of follow-on windows which are used to configure the options for UKCA. |
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| − | |||
| − | This tutorial will focus on chemistry only, and will not cover any aspects of the [http://www.see.leeds.ac.uk/research/icas/atmospheric-chemistry-and-aerosols/other-links/aerosol-modelling/the-glomap-model/ GLOMAP-mode] aerosol scheme. |
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| − | |||
| − | =====Main UKCA Panel===== |
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| − | [[Image:UKCA_vn8.4_Panel_Main.png|thumb|right|Figure 3: The main UKCA panel.]] |
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| − | In this panel you can turn UKCA on and off, choose the solver to use, and which scheme to use using that solver (changing the solver choice will change the available schemes). The '''Help''' button on this page is quite informative. This panel is shown in Figure 3. |
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| − | |||
| − | =====Main UKCA Panel → NEXT follow-on window===== |
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| − | [[Image:UKCA_vn8.4_Panel_Main_NEXT.png|thumb|right|Figure 4: The first follow-on window from the main UKCA panel.]] |
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| − | In this panel you can set some optional switches, which will be available depending on the scheme used. Again, the '''Help''' button is extensive. It is suggested for Stratospheric chemistry schemes (e.g. ''CheS/Strat'' and ''CheST/StratTrop'') that the UM specific humidity field is always used as the UKCA H2O tracer. This panel is shown in Figure 4. |
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| − | |||
| − | =====Main UKCA Panel → PHOTO follow-on window===== |
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| − | [[Image:UKCA_vn8.4_Panel_Main_PHOTO.png|thumb|right|Figure 5: The UKCA photolysis follow-on panel.]] |
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| − | This panel is used to define the photolysis scheme used, either using pure look-up tables, the (tropospheric) Fast-J scheme, or the (tropospheric and stratospheric) Fast-JX scheme. Within each scheme are possible other options, such as the location of required input files. The '''Help''' button has more information, and for ''CheST/StratTrop'' chemistry the options shown in Figure 5 are recommended. |
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| − | |||
| − | =====Main UKCA Panel → LOWBC follow-on window===== |
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| − | |||
| − | [[Image:UKCA_vn8.4_Panel_Main_LOWBC.png|thumb|right|Figure 6: The UKCA lower-boundary condition panel.]] |
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| − | This panel is shown in Figure 6, and also has useful information under the '''Help''' button. For some UKCA schemes, such as the Stratospheric or Stratospheric + Tropospheric (''CheST/StratTrop'') chemistry, a lower-boundary condition is required for some of the long-lived species, principally the CFCs. The default in the code is to take these from the WMO A1b scenario specified for CMIP3 (and as was used in the CCMVal-2 model intercomparison). However, this scheme is tied in to the date during the run, changing as this changes. If instead a ''timeslice'' run is to be performed (i.e. although the date is changing, all the forcings remain the same) then these lower-boundary conditions need to be set, and this is done in this panel. Only those species that are not defined already are set here, as the others are taken from the '''Scientific Parameters and Sections → Spec of trace gases''' panels. Also, these values are also used by the chemical solver when a constant field is used, which is why H2 and N2 are also defined here if required. |
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| − | |||
| − | If you need to get the values for these species, then the '''scenario''' program is available on PUMA at <tt>/home/ukca/bin/scenario</tt>. If you wanted the values for the 1st July 2000, you would run (and get the output) like this: |
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| − | |||
| − | $ scenario 2000/07/01 |
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| − | ----------------------------------------------- |
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| − | | 2000/07/01 WMOA1 SCENARIO: | |
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| − | ----------------------------------------------- |
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| − | | CFCl3 = 1.24350E-09 CFC11/F11 | |
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| − | | CF2Cl2 = 2.25150E-09 CFC12/F12 | |
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| − | | CF2ClCFCl2 = 5.31200E-10 CFC113/F113 | |
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| − | | CF2ClCF2Cl = 1.00400E-10 CFC114/F114 | |
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| − | | CF2ClCF3 = 4.68200E-11 CFC115/F115 | |
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| − | | CCl4 = 5.23050E-10 | |
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| − | | MeCCl3 = 2.10000E-10 CH3CCl3 | |
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| − | | CHF2Cl = 4.23850E-10 HCFC22 | |
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| − | | MeCFCl2 = 5.12950E-11 HCFC141b | |
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| − | | MeCF2Cl = 4.17500E-11 HCFC142b | |
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| − | | CF2ClBr = 2.31150E-11 H1211 | |
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| − | | CF2Br2 = 3.29800E-13 H1202 | |
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| − | | CF3Br = 1.40600E-11 H1301 | |
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| − | | CF2BrCF2Br = 3.68000E-12 H2402 | |
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| − | | MeCl = 9.58800E-10 CH3Cl | |
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| − | | MeBr = 2.82700E-11 CH3Br | |
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| − | | CH2Br2 = 1.80186E-11 | |
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| − | | N2O = 4.80605E-07 | |
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| − | | CH4 = 9.75050E-07 | |
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| − | | CF3CHF2 = 0.00000E+00 HFC125 | |
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| − | | CH2FCF3 = 0.00000E+00 HFC134a | |
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| − | | H2 = 3.45280E-08 | |
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| − | | N2 = 7.54682E-01 | |
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| − | | CO2 = 5.62075E-04 | |
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| − | ----------------------------------------------- |
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| − | UM/UKCA LBC MMRs for: 2000/07/01, using the WMOA1 scenario |
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| − | VALUES FOR USE IN THE UMUI (ZERO VALUES CAN BE TREATED AS "Excluded"): |
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| − | CH4 = 9.750E-07 |
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| − | N2O = 4.806E-07 |
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| − | CFC11 = 1.244E-09 |
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| − | CFC12 = 2.251E-09 |
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| − | CFC113 = 5.312E-10 |
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| − | HCFC22 = 4.238E-10 |
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| − | HFC125 = 0.00 |
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| − | HFC134a = 0.00 |
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| − | CO2 = 5.62075E-04 |
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| − | VALUES FOR USE IN THE UKCA HAND-EDIT: |
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| − | MeBrMMR=2.82700E-11, |
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| − | MeClMMR=9.58800E-10, |
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| − | CH2Br2MMR=1.80186E-11, |
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| − | H2MMR=3.45280E-08, |
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| − | N2MMR=0.75468 , |
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| − | CFC114MMR=1.00400E-10, |
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| − | CFC115MMR=4.68200E-11, |
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| − | CCl4MMR=5.23050E-10, |
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| − | MeCCl3MMR=2.10000E-10, |
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| − | HCFC141bMMR=5.12950E-11, |
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| − | HCFC142bMMR=4.17500E-11, |
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| − | H1211MMR=2.31150E-11, |
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| − | H1202MMR=3.29800E-13, |
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| − | H1301MMR=1.40600E-11, |
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| − | H2402MMR=3.68000E-12, |
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| − | |||
| − | [[Image:UKCA_vn8.4_Panel_Main_COUPL.png|thumb|right|Figure 7: The UKCA coupling panel.]] |
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| − | The default is to use the WMO A1b, but you can also request any of the RCP scenarios for CMIP5, by running one of, e.g. |
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| − | |||
| − | scenario 2000/07/01 RCP2.6 |
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| − | scenario 2000/07/01 RCP4.5 |
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| − | scenario 2000/07/01 RCP6.0 |
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| − | scenario 2000/07/01 RCP8.5 |
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| − | |||
| − | The WMO A1b scenario is only valid for the years 1950-2100 inclusive, whereas the RCP scenarios are valid from 1765-2500 inclusive. Note also that this script uses a 360-day calendar. |
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| − | |||
| − | =====Main UKCA Panel → COUPL follow-on window===== |
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| − | |||
| − | This panel is used to control which chemical species feed-back onto the Unified Model's radiation scheme, or if the dry deposition scheme is interactive with the land-surface, and is shown in Figure 7. If these trace gases feed-back, then, e.g. the N2O field from UKCA is used, rather than setting a constant value throughout the atmosphere. It is recommended that the interactive dry deposition scheme is always used. |
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| − | |||
| − | =====Main UKCA Panel → UKCA_TRA follow-on window===== |
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| − | |||
| − | This panel gives the listing of all the tracers which are turned on by default for the chemistry scheme chosen. If you are adding new tracers you are unable to change these values and must instead use a hand-edit. This will be covered in more detail in the [[UKCA & UMUI Tutorial 4 | adding new chemical tracers]] tutorial ('''INSERT CORRECT LINK HERE'''). |
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| − | |||
| − | |||
| − | ---- |
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| − | ''Written by [[User:Nla27 | Luke Abraham]] 2014'' |
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