Arctic sea ice volume export through the Fram Strait: variation and its effect factors
Arctic sea ice volume export through the Fram Strait: variation and its effect factors
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DOI：
10.1007/s13131-022-2075-4
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发表时间：
2023-05
影响因子：
1.4
通讯作者：
Haili Li;C. Ke;Qinghui Zhu;Xiaoyi Shen
中科院分区：
文献类型：
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作者：
Haili Li;C. Ke;Qinghui Zhu;Xiaoyi Shen
北极海冰输出对于淡水和海冰质量的重新分布具有重要意义。本文利用海冰厚度、海冰速度和海冰密集度（SIC）估算了2011 - 2018年弗拉姆海峡的海冰输出量。进一步分析了海冰厚度、速度和密集度对海冰体积输出的贡献。讨论了北极涛动（AO）、北大西洋涛动（NAO）和北极偶极子（AD）等大气环流指数与海冰输出的关系。最后，我们分析了风驱动的海洋环流指数（Ekman运输（ET））的海冰体积输出的影响。海冰体积输出在冬季迅速增加，春季减少。未来冬季海冰输出量有可能超过春季。在海冰厚度、速度和SIC中，对海冰输出贡献最大的是速度。通过弗拉姆海峡分区门输出的海冰量（占弗拉姆海峡海冰输出总量的97%）远高于通过分区门的海冰输出量（3%），这是由于分区门流出的海冰具有厚度大的特点（主要大于1 m）、高流速（主要大于0.06 m/s）和高浓度（主要大于80%）。AD和ET分别解释了海冰体积输出变化的53.86%和38.37%。
Arctic sea ice export is important for the redistribution of freshwater and sea ice mass. Here, we use the sea ice thickness, sea ice velocity, and sea ice concentration (SIC) to estimate the exported sea ice volume through the Fram Strait from 2011 to 2018. We further analyse the contributions of the sea ice thickness, velocity and concentration to sea ice volume export. Then, the relationships between atmospheric circulation indices (Arctic Oscillation (AO), North Atlantic Oscillation (NAO), and Arctic Dipole (AD)) and the sea ice volume export are discussed. Finally, we analyse the impact of wind-driven oceanic circulation indices (Ekman transport (ET)) on the sea ice volume export. The sea ice volume export rapidly increases in winter and decreases in spring. The exported sea ice volume in winter is likely to exceed that in spring in the future. Among sea ice thickness, velocity and SIC, the greatest contribution to sea ice export comes from the ice velocity. The exported sea ice volume through the zonal gate of the Fram Strait (which contributes 97% to the total sea ice volume export of the Fram Strait) is much higher than that through the meridional gate (3%) because the sea ice flowing out of the zonal gate has the characteristics of a high thickness (mainly thicker than 1 m), a high velocity (mainly faster than 0.06 m/s) and a high concentration (mainly higher than 80%). The AD and ET explain 53.86% and 38.37% of the variation in sea ice volume export, respectively.