Idealized dry quasi 2‐D mesoscale simulations of cold‐air outbreaks over the marginal sea ice zone with fine and coarse resolution

• DOI: 10.1002/jgrd.50679
• Publication Date: 2013-07-25T22:42:58Z
• Authors: Dmitry G. Chechin; Christof Lüpkes; Irina A. Repina; Vladimir M. Gryanik
• Keywords: Forcing (mathematics)

A nonhydrostatic model (NH3D) is used for idealized dry quasi 2‐D simulations of Arctic cold‐air outbreaks using horizontal grid spacings between 1.25 and 60 km. Despite the setup, results agree well with observations over Fram Strait. It shown that an important characteristic flow regime during ice‐breeze jet (IBJ) a maximum wind speed exceeding often large‐scale geostrophic speed. According to present simulations, which very those another mesoscale (METRAS), occurrence, strength, extent L this depend strongly on external forcing especially direction relative orientation ice edge. The latter dependency explained by effects thermally induced open water Coriolis force. found coarse‐resolution runs underestimate strength jet. This underestimation has consequences surface fluxes heat momentum, are also underestimated about 10–15% average region edge 120–180 km downstream. Our suggest spacing /7 required (about 10–30 km) simulate IBJ accuracy at least 10%. Thus, models as might contain uncertainties regard simulated would influence energy budget in large along marginal sea zones.