Regridding Methods Available In MAPL

Introduction

MAPL supports regridding methods with underlying ESMF regridding capabilities as a base but provides extensions on top of this that can be invoked in a Fortran procedure that uses MAPL. Note all regridding methods respect MAPL_UNDEF and will not include the contributions any source point that is MAPL_UNDEF when computing destination point.

Using MAPL Regridders in code

Specifying Methods in ExtData and History (in MAPL v2.22.0 and greater)

keyword values for regrid_method in both History collection and in an ExtData2G entry:

• BILINEAR - ESMF bilinear
• CONSERVE - ESMF 1st order conservative
• VOTE - ESMF custom dynamic regridding options on 1st order conservative regridding to implement method that provide for “voting” (majority of tiles on exchange grid wins)
• FRACTION - ESMF custom dynamic regridding options on 1st order conservative regridding to implement method that provide for “fraction” (what fraction of tiles on exchange grid have a specific value)
• CONSERVE_2ND - ESMF 2nd order conservative
• PATCH - ESMF 2nd order bilinear
• CONSERVE_HFLUX - regrid horizontal fluxes in an exact manner for integral grid resolution ratios.
• BILINEAR_MONOTONIC - ESMF bilinear + custom dynamic mask to ensure they any destination values that are greater than a source value are renormalized to maximum source value. This can
• CONSERVE_MONOTONIC - ESMF 1st order conserve + the above details the same as the BILINEAR_MONOTONIC