Influence of leads in sea ice on the temperature of the atmospheric boundary layer during polar night
Influence of leads in sea ice on the temperature of the atmospheric boundary layer during polar night
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DOI：
10.1029/2007gl032461
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发表时间：
2008-02
影响因子：
5.2
通讯作者：
C. Lüpkes;T. Vihma;G. Birnbaum;U. Wacker
中科院分区：
文献类型：
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作者：
C. Lüpkes;T. Vihma;G. Birnbaum;U. Wacker
海冰内开放引线对近地表大气温度的最大影响是使用一维大气模型与热力学雪/海冰模型相结合来估计的。该研究仅限于极夜期间的晴朗天空条件。该模型初始化与一个典型的冬季大气温度廓线。结果分析了在不同的积分时间对应于不同的fetches作为风速和海冰浓度A的函数的断裂海冰。结果表明，当A > 90%时，海冰分数的微小变化对近地表温度有很大影响。1%的变化导致高达3.5 K的温度信号。对于10 m风速，约4 m s−1的阈值将空气-冰相互作用过程分为弱风和强风状态。
The maximum effect of open leads within sea ice on the near‐surface atmospheric temperature is estimated using a 1D atmospheric model coupled with a thermodynamic snow/sea ice model. The study is restricted to clear‐sky conditions during polar night. The model is initialized with a typical wintertime atmospheric temperature profile. Results are analyzed at different integration times corresponding to different fetches over the fractured sea ice as a function of wind speed and sea ice concentration A. The results demonstrate that for A > 90% small changes in the sea ice fraction have a strong effect on the near‐surface temperature. A change by 1% causes a temperature signal of up to 3.5 K. A threshold value of about 4 m s−1 for the 10‐m wind speed divides the air‐ice interaction process into a weak‐wind and strong‐wind regime.