I am trying to understand the subroutine ‘TROPIN’ (Met Office Science Repository Service).
The code refers to UMDP S1 for more details, but this paper is not listed at https://code.metoffice.gov.uk/doc/um/latest/umdp.html.
Do you know where I can find the following documentation paper:
Interpolation Techniques and Grid Transformation Used in the Unified Model, A. Dickinson, Unified Model Documentation Paper S1, version 11, 18 Feb 98.
Thank you very much for your help!