Preprints
https://doi.org/10.5194/gmd-2023-177
https://doi.org/10.5194/gmd-2023-177
Submitted as: development and technical paper
 | 
04 Sep 2023
Submitted as: development and technical paper |  | 04 Sep 2023
Status: this preprint is currently under review for the journal GMD.

Truly Conserving with Conservative Remapping Methods

Karl E. Taylor

Abstract. Conservative mapping of data from one horizontal grid to another should preserve certain integral or mean properties of the original data. This may be essential in some model applications, including ensuring realistic exchange of energy and mass between coupled model components. It can also be essential for certain types of analysis, such as evaluating how far a system is from an equilibrium state. For some common grids, existing remapping algorithms may fail to perfectly represent the shapes and sizes of grid cells, which leads to errors in the remapped fields. A procedure is presented here that enables users to rely on the mapping weights generated by remapping algorithms but corrects for their deficiencies. With this procedure, for a given pair of source and destination grids, a single set of remapping weights can be applied to remap any variable, including those with grid cells that are partially or fully masked.

Karl E. Taylor

Status: open (until 30 Oct 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on gmd-2023-177', Moritz Hanke, 11 Sep 2023 reply
  • RC1: 'Comment on gmd-2023-177', Anonymous Referee #1, 13 Sep 2023 reply

Karl E. Taylor

Karl E. Taylor

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Short summary
Remapping gridded data in a way that preserves the conservative properties of the climate system can be essential in coupling model components and for accurate assessment of the system’s energy and mass constituents. Remapping packages capable of handling a wide variety of grids can, for common grids, calculate remapping weights that are somewhat inaccurate. Correcting for these errors, guidelines are provided to ensure conservation when the weights are used in practice.