Preconditioning of Summer Melt Ponds From Winter Sea Ice Surface Temperature
Preconditioning of Summer Melt Ponds From Winter Sea Ice Surface Temperature
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DOI：
10.1029/2022gl101493
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发表时间：
2023-02
影响因子：
5.2
通讯作者：
Linda Thielke;Niels Fuchs;G. Spreen;B. Tremblay;G. Birnbaum;M. Huntemann;N. Hutter;P. Itkin;Arttu Jutila;M. Webster
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文献类型：
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作者：
Linda Thielke;Niels Fuchs;G. Spreen;B. Tremblay;G. Birnbaum;M. Huntemann;N. Hutter;P. Itkin;Arttu Jutila;M. Webster
比较冬季直升机携带的表面温度图和夏季来自为期一年的北极气候考察研究多学科漂流观测站的光学正交图，我们发现冬季温暖异常与次年夏季融化池位置之间存在很强的几何相关性。温暖异常与较薄的冰雪有关，即表面凹陷和再冻结的铅，这使得融化期间水分积聚。温暖的表面温度异常在1月0.3-2.5 K温暖的海冰，后来形成融化的池塘。一维稳态热力学模型表明，观测到的地表温差与观测到的冰厚和雪深一致。我们展示了潜在的季节性预测夏季融化池的位置和覆盖范围从冬季表面温度观测。基于阈值的分类实现了41%的融化池的正确分类。
Comparing helicopter‐borne surface temperature maps in winter and optical orthomosaics in summer from the year‐long Multidisciplinary drifting Observatory for the Study of Arctic Climate expedition, we find a strong geometric correlation between warm anomalies in winter and melt pond location the following summer. Warm anomalies are associated with thinner snow and ice, that is, surface depression and refrozen leads, that allow for water accumulation during melt. Warm surface temperature anomalies in January were 0.3–2.5 K warmer on sea ice that later formed melt ponds. A one‐dimensional steady‐state thermodynamic model shows that the observed surface temperature differences are in line with the observed ice thickness and snow depth. We demonstrate the potential of seasonal prediction of summer melt pond location and coverage from winter surface temperature observations. A threshold‐based classification achieves a correct classification for 41% of the melt ponds.