Quiz: Idealised Configurations

--- title: Idealised Configuration Quiz description: Test your understanding of idealised applications of LFRic-Atmosphere. shuffle: true show_answers: true show_score: true show_correct_answers: true show_incorrect_answers: true show_question_count: true --- ## What planetary parameters are hard-wired and cannot be changed in LFRic-Atmosphere? > hint: Think of different science cases discussed in the training. 1. [ ] Surface gravity > Try again! This parameter can certainly be changed! 1. [x] All these can be changed > Correct! LFRic-Atmosphere is quite flexible! 1. [ ] Gas constants of the background air (it is always assumed to be Earth air.) > Try again! This can be changed! 1. [ ] Stellar constant (it is a constant after all!) > No, even for Earth simulations this could be changed. ## What is the heat capacity of the atmosphere set by, and can it be changed? > hint: It lives alongside other planetary constants such as gravity and the gas constant. 1. [ ] It is hard-coded for Earth's air and cannot be changed > Try again! Just like gravity and the gas constant, the heat capacity is a configurable planetary parameter. 1. [x] It is set by the `cp` parameter and can be changed for other atmospheres > Correct! `cp` is the specific heat capacity at constant pressure, defined in `[namelist:planet]`, and can be modified to represent non-Earth atmospheres. 1. [ ] It is calculated automatically from the gas constant `rd` and cannot be set directly > Try again! `cp` is set directly as its own namelist parameter, independently of `rd`. 1. [ ] It only matters for configurations that include an ocean > Try again! The idealised configurations in this practical are atmosphere-only; `cp` describes the heat capacity of the atmosphere itself. ## Which namelist section would you look in to change the planet's gravity, and where would you look to change the amount of CO2 in the atmosphere? > hint: One section groups physical constants of the planet, the other groups atmospheric composition. 1. [ ] Both are set in the same `[namelist:planet]` section > Try again! Gravity is a planetary constant, but CO2 concentration is configured elsewhere. 1. [x] Gravity is set in `[namelist:planet]`, while CO2 concentration is set in `[namelist:radiative_gases]` > Correct! Planetary constants such as `gravity`, `cp`, `omega` and `radius` belong to `[namelist:planet]`, whereas gas concentrations such as `co2_mix_ratio` belong to `[namelist:radiative_gases]`. 1. [ ] Both are set in `[namelist:radiative_gases]` > Try again! Gravity is not a radiative gas property; it belongs in `[namelist:planet]`. 1. [ ] Gravity is set in `[namelist:radiative_gases]`, while CO2 concentration is set in `[namelist:planet]` > Try again! This is the wrong way round - gravity is a planetary constant, CO2 concentration is a radiative gas property. ## What parameters control the effect of rotation in LFRic? 1. [x] The global switch is ``rotating`` in the ``formulation`` section, while the rotation rate itself is controlled by ``omega``. > Correct! LFRic-Atmosphere is quite flexible! 1. [ ] It's ``omega`` in the ``planet`` namelist of course! > Try again! There's another parameter that switches rotation on/off. 1. [ ] The rotation rate is fixed to be that of the modern-day Earth and cannot be changed. > Try again! The rotation rate cn be changed. 1. [ ] The parameter is called ``rotation_omega`` and if it's zero the rotation is off. > No, the parameter name is wrong, although setting ``omega=0.0`` in ``[namelist:planet]`` is valid. ## What does "CRM" stand for? 1. [x] Cloud-Resolving Model > Correct! A CRM resolves convection explicitly rather than parameterising it, making it ideal for studying cloud processes in detail. 1. [ ] Climate Radiation Module > Try again! CRM is not about a standalone radiation module. 1. [ ] Convective Representation Method > Try again! CRM does not refer to a parameterisation method; it refers to a model that resolves convection directly. 1. [ ] Coupled Regional Model > Try again! CRM is not about regional coupling.