The evolution of the Fram Strait sea ice volume export decomposed by age: estimating with parameter-optimized sea ice-ocean model outputs
The evolution of the Fram Strait sea ice volume export decomposed by age: estimating with parameter-optimized sea ice-ocean model outputs
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DOI：
10.1088/1748-9326/acaf3b
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发表时间：
2022-12
影响因子：
6.7
通讯作者：
Yijun Yang;C. Min;Hao Luo;F. Kauker;R. Ricker;Qinghua Yang
中科院分区：
文献类型：
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作者：
Yijun Yang;C. Min;Hao Luo;F. Kauker;R. Ricker;Qinghua Yang
通过弗拉姆海峡的海冰输出对北极海冰的动态演变至关重要，并能进一步调节北极海冰质量平衡以及海洋温盐环流。基于一个参数优化的全物理海洋-海冰耦合模式的输出和海冰年龄观测资料，估算了弗拉姆海峡的海冰体积通量及其年龄演变。年平均SIV通量的估计值约为1605 ± 315 km 3 yr−1，1979-2021年没有显著趋势。结合海冰年龄资料，得到了1984-2020年海冰年龄及其对应的SIV通量的变化。第一年冰的SIV通量如预期的那样显著增加，但在2010年代对总通量的贡献仍然很小，仅占3.5%。多年冰中不同年龄的SIV通量呈现不同的变化。2010年SIV年通量中第2年冰和第3年冰所占的比例分别从20世纪80年代的6.8%和25.0%增加到49.0%和38.8%。而4年冰和5年以上冰的比例则从80年代的22.8%和45.0%显著下降到7.1%和1.6在2010年代，分别。与此同时，通过弗拉姆海峡的年输出量的主要年龄从第4年和第5+年的冰转移到2007/2008年左右的第2年和第3年的冰。值得注意的是，在2008年之前，弗拉姆海峡冰输出的变化对北极SIV的变化具有调节作用，但在2008年之后则相反，表明随着海冰年龄的减小，弗拉姆海峡SIV输出对北极SIV变化的影响逐渐减弱。研究结果有助于加深对北极变暖背景下弗拉姆海峡SIV输出演变的认识。
Sea ice export through the Fram Strait is crucial in the dynamic evolution of Arctic sea ice and can further modulate Arctic sea ice mass balance as well as the ocean thermohaline circulation. In this study, based on outputs from a parameter-optimized and fully physical ocean–sea ice coupled model and sea ice age observation, we estimate sea ice volume (SIV) flux and its age evolution via the Fram Strait. The estimate of mean annual SIV flux is about 1605 ± 315 km3 yr−1 without a significant trend for 1979–2021. Combining with sea ice age data, the variation of the sea ice age and its corresponding SIV flux are obtained for 1984–2020. The SIV flux of 1st-year ice significantly increases as expected, but it still contributes very little to the total flux in the 2010s with a proportion of 3.5%. SIV fluxes of different ages in multi-year ice present diverse variations. The proportions of 2nd-year ice and 3rd-year ice in the annual SIV flux show an extreme increase from 6.8% and 25.0% in the 1980s to 49.0% and 38.8% in the 2010s, respectively, while the proportions of 4th-year ice and 5th-year and older (5+ year) ice significantly decrease from 22.8% and 45.0% in the 1980s to 7.1% and 1.6% in the 2010s, respectively. Meanwhile, the prevailing age of annual volume export via Fram Strait shifts from 4th-year and 5+ year ice to 2nd-year and 3rd-year ice around 2007/2008. It is worth noticing that the variation in Fram Strait ice export modulates the variation in Arctic SIV prior to 2008, but the reverse is true after 2008, indicating a decreasing influence of Fram Strait SIV export on Artic SIV variability with decreasing sea ice age. The results are beneficial to promote the understanding of the evolution of Fram Strait SIV export under the warming Arctic.