Spatio-temporal variability of polynya dynamics and ice production in the Laptev Sea between the winters of 1979/80 and 2007/08
Spatio-temporal variability of polynya dynamics and ice production in the Laptev Sea between the winters of 1979/80 and 2007/08
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DOI：
10.3402/polar.v30i0.5971
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发表时间：
2011-01
期刊：
影响因子：
1.9
通讯作者：
S. Willmes;S. Adams;D. Schröder;G. Heinemann
中科院分区：
文献类型：
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作者：
S. Willmes;S. Adams;D. Schröder;G. Heinemann
Polynyas在拉普捷夫海的复发和年际冬季冰生产方面进行了检查。我们使用一个冰间湖分类方法的基础上被动微波卫星数据，以获得每日冰间湖面积从长期海冰浓度。这提供了对拉普捷夫海大陆架上的开放水域和薄冰区域的空间和时间变化的深入了解。使用热红外卫星数据，以获得一个经验的薄冰分布的厚度范围从0到20厘米，我们计算每日平均表面热量损失和由此产生的冬季冰形成的拉普捷夫海冰穴1979年和2008年之间使用再分析数据提供的国家环境预测中心，美国，作为大气强迫。结果表明，以前的研究显着高估了冰穴的冰生产在拉普捷夫海的贡献。冰穴的平均冬季产冰量约为55 km 3 ±27%，主要由冰穴面积、风速和相关的大尺度环流模式决定。在1979/80至2007/08年期间，没有发现冰产量的趋势。
Polynyas in the Laptev Sea are examined with respect to recurrence and interannual wintertime ice production. We use a polynya classification method based on passive microwave satellite data to derive daily polynya area from long-term sea-ice concentrations. This provides insight into the spatial and temporal variability of open-water and thin-ice regions on the Laptev Sea Shelf. Using thermal infrared satellite data to derive an empirical thin-ice distribution within the thickness range from 0 to 20 cm, we calculate daily average surface heat loss and the resulting wintertime ice formation within the Laptev Sea polynyas between 1979 and 2008 using reanalysis data supplied by the National Centers for Environmental Prediction, USA, as atmospheric forcing. Results indicate that previous studies significantly overestimate the contribution of polynyas to the ice production in the Laptev Sea. Average wintertime ice production in polynyas amounts to approximately 55 km3±27% and is mostly determined by the polynya area, wind speed and associated large-scale circulation patterns. No trend in ice production could be detected in the period from 1979/80 to 2007/08.