Exchange grid & multi-ice categories coupling: comparison of two flux computation strategies

• Main Authors: Maisonnave Eric, Voldoire Aurore
• Format: Other/Unknown Material
• Language: unknown
• Published: 2019
• Subjects: Arctic; Antarctic; Antarc*; Sea ice
• Online Access: https://zenodo.org/record/3480080; https://doi.org/10.5281/zenodo.3480080

We evaluate the impact on fluxes over ice, particularly non solar heat, and the coupled effects to the NEMO/GELATO ocean/sea-ice model, of a separate flux calculation by SURFEX for each of the five ice categories represented in the GELATO ice model. We compare these effects with those produced by a flux computing via an exchange grid. The significance of the results is too small to conclude to the relative level of relevance of an implementation in ARPEGE of the exchange grid in one hand, and of the separate coupling of multi-ice category surface field on the other hand, but it could be established that (i) spatial ice temperature variability under atmosphere mesh is bigger than variability of per category ice temperature interpolated on the same atmosphere grid point, but its average temperature is smaller and, consequently, (ii) one year integrated effect of exchange grid fluxes in ocean modifies, although marginally, total ice volume in both Arctic and Antarctic regions, which is less significantly the case for multi-ice category coupling