Sensitivity of Air‐Sea Heat Exchange in Cold‐Air Outbreaks to Model Resolution and Sea‐Ice Distribution
Sensitivity of Air‐Sea Heat Exchange in Cold‐Air Outbreaks to Model Resolution and Sea‐Ice Distribution
复制标题
冷空气爆发时海气热交换对模型分辨率和海冰分布的敏感性
DOI：
10.1029/2020jd033610
复制
发表时间：
2020
期刊：
影响因子：
--
通讯作者：
T. Spengler
中科院分区：
文献类型：
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作者：
C. Spensberger;T. Spengler
模拟冷空气爆发期间的海气相互作用是一项重大挑战，因为涉及的尺度和物理过程范围很广。利用极地WRF模式，我们研究了下游空气质量特性对(A)模式分辨率、(B)边缘冰区(MIZ)的锐度和(C)海冰边缘几何形状的敏感性。MIZ分辨率的锐化对峰值热通量和大气水循环有很大影响。对于更尖锐的MIZ，滚流对流是在更接近海冰边缘的地方启动的，从而增加了蒸发和降水。这增加了进入大气的热量传递，而对大气水分收支的净影响很小。总体而言，较高的大气分辨率会增加从海洋中提取的峰值和净热量。海冰边缘的几何形状会引起影响海-气交换的辐合区或辐散区。
Modeling air‐sea interactions during cold air outbreaks poses a major challenge because of the vast range of scales and physical processes involved. Using the Polar WRF model, we investigate the sensitivity of downstream air mass properties to (a) model resolution, (b) the sharpness of the marginal‐ice zone (MIZ), and (c) the geometry of the sea ice edge. The resolved sharpness of the MIZ strongly affects peak heat fluxes and the atmospheric water cycle. For sharper MIZs, roll convection is initiated closer to the sea ice edge, increasing both evaporation and precipitation. This yields an increased heat transfer into the atmosphere while the net effect on the atmospheric moisture budget is small. Overall, higher atmospheric resolution increases both the peak and net heat extracted from the ocean. The geometry of the sea ice edge can induce convergence or divergence zones that affect the air‐sea exchange.