New CH4 lifetime diagnostic

[FranziskaWinterstein]

Description

This diagnostic calculates the CH4 lifetime and plot it in several different plot types.

This is work in progress

• CH4 lifetime calculated in Troposphere only

• lifetime plotted as timeseries only

• use of model data on modellevels and on pressurelevels possible but comparability not fully tested

• calculates a climatological tropopause-pressure,

• relies on grmass for calculating CH4 mass, other option needs debugging

• Link to documentation:

• • *

Checklist

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New or updated recipe/diagnostic

• [ ] 🧪 Recipe runs successfully
• [ ] 🧪 Recipe is well documented
• [ ] 🧪 Figure(s) and data look as expected from literature
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