4.5 Article

The Impact of Lead Patterns on Mean Profiles of Wind, Temperature, and Turbulent Fluxes in the Atmospheric Boundary Layer over Sea Ice

期刊

ATMOSPHERE
卷 13, 期 1, 页码 -

出版社

MDPI
DOI: 10.3390/atmos13010148

关键词

atmospheric boundary layer; sea ice leads; turbulent fluxes; microscale modeling; regional climate modeling; convection over leads; sea ice; turbulence parameterization; vertical entrainment; counter-gradient transport

资金

  1. Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) via the Transregional Collaborative Research Center ArctiC Amplification (AC)3 [268020496-TRR 172]
  2. Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [SPP 1158, LU 818/5-1]

向作者/读者索取更多资源

This study investigates the impact of convection over leads in the polar regions on atmospheric boundary layer (ABL) characteristics. The simulations show significant effects of considering both the leads and their geometry on ABL patterns. Additional evaluations of different turbulence parameterizations indicate large effects by gradient-independent heat transport and vertical entrainment.
In the polar regions, the atmospheric boundary layer (ABL) characteristics are strongly influenced by convection over leads, which are elongated channels in the sea ice covered ocean. The effects on the ABL depend on meteorological forcing and lead geometry. In non-convection-resolving models, in which several leads of potentially different characteristics might be present in a single grid cell, such surface characteristics and the corresponding ABL patterns are not resolved. Our main goal is to investigate potential implications for such models when these subgrid-scale patterns are not considered appropriately. We performed non-eddy-resolving microscale simulations over five different domains with leads of different widths separated by 100% sea ice. We also performed coarser-resolved simulations over a domain representing a few grid cells of a regional climate model, wherein leads were not resolved but accounted for via a fractional sea ice cover of 91% in each cell. Domain size and mean sea ice concentration were the same in all simulations. Differences in the domain-averaged ABL profiles and patterns of wind, temperature, and turbulent fluxes indicate a strong impact of both the leads and their geometry. Additional evaluations of different turbulence parameterizations show large effects by both gradient-independent heat transport and vertical entrainment.

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