The Atmospheric Boundary Layer Above the Marginal Ice Zone: Scaling, Surface Fluxes, and Secondary Circulations
The Atmospheric Boundary Layer Above the Marginal Ice Zone: Scaling, Surface Fluxes, and Secondary Circulations
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边缘冰区上方的大气边界层：结垢、表面通量和二次环流
DOI：
10.1007/s10546-023-00825-x
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发表时间：
2023
影响因子：
4.3
通讯作者：
Bou-Zeid, Elie
中科院分区：
文献类型：
--
作者：
Fogarty, Joseph;Bou-Zeid, Elie
由于全球变暖，北极正在经历快速变化，包括边缘冰区（MIZ）的扩张，这是一个混合冰和开放水面的区域。为了预测大气与这些表面的相互作用，气候模式中的一个关键过程，本文研究了一个简化的理论框架，以无量纲化的混合冰水表面（MIZ-ABL）上的大气边界层（ABL）的动力学。本文提出了一个非均匀的Richardson数来解释冰和水面之间的温度差与天气压力梯度强迫的关系。与风的角度相对于冰-水界面，这个框架假设，这两个无量纲的数字，无论个人的维度变量（表面温度和地转风速）是足以预测MIZ-ABL动态。为了检验这一框架，大涡模拟采用了半冰和半水面，不同的表面温度和地转风速。虽然冰，水，和聚合物表面的表面热通量似乎被捕获合理以及由和Ri，平均风和湍流动能（TKE）的配置文件没有，这表明不仅在两个表面之间的稳定性的差异，但也在每个表面的个人稳定性影响的动态。风的角度有显着的影响的结果，无论是在表面的热通量，湍流和色散通量在MIZ-ABL，和二次环流的结构。当风垂直于水-冰界面吹时，内部边界层是有利的，除了在最高的Risimulated。在风平行于界面的情况下，出现了平行于海岸的大卷。本文提出的问题至少与它回答的问题一样多，强调了对MIZ-ABL进行进一步研究的必要性。
The Arctic is undergoing rapid changes due to global warming, including the expansion of the marginal ice zone (MIZ), a zone of mixed ice and open water surfaces. To predict the atmospheric interaction with these surfaces, a critical process in climate models, this paper examines a simplified theoretical framework to non-dimensionalize the dynamics of the atmospheric boundary layer (ABL) over a mixed ice-water surface (MIZ–ABL). A heterogeneity Richardson number,, is proposed to account for the difference in temperature between the ice and water surface in relation to the synoptic pressure gradient forcing. With the wind angle relative to the ice-water interface,, this framework hypothesizes that these two dimensionless numbers, regardless of individual dimensional variables (surface temperature and geostrophic wind speed) are sufficient to predict the MIZ–ABL dynamics. To test this framework, large-eddy simulations were employed over half-ice and half-water surfaces, with varying surface temperatures and geostrophic wind velocities. While the surface heat fluxes over ice, water, and the aggregate surface seem to be captured reasonably well byand Ri, the mean wind and turbulent kinetic energy (TKE) profiles were not, suggesting that not only the difference in stability between the two surface, but also the individual stabilities over each surface influence the dynamics. The wind angle had a significant impact on the results, both in terms of heat fluxes at the surface, turbulent and dispersive fluxes in the MIZ–ABL, and the structure of the secondary circulations. When wind blows perpendicular to the water-ice interface, internal boundary layers are favoured except at the highest Risimulated. For cases with wind parallel to the interface, large rolls parallel to the shore emerge. The paper raises at least as many questions as it answers, highlighting the need for further studies of the MIZ–ABL.
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