Quantification of ice production in Laptev Sea polynyas and its sensitivity to thin-ice parameterizations in a regional climate model
Quantification of ice production in Laptev Sea polynyas and its sensitivity to thin-ice parameterizations in a regional climate model
复制标题
拉普捷夫海冰间湖产冰量的量化及其对区域气候模型中薄冰参数化的敏感性
DOI：
10.5194/tc-10-2999-2016
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
C. Drüe
中科院分区：
文献类型：
--
作者：
O. Gutjahr;G. Heinemann;A. Preußer;S. Willmes;C. Drüe
抽象的。拉普捷夫海冰间湖海冰产生的量化对于北极海冰预算和大气热量损失非常重要。我们根据水平分辨率为 5 公里的区域气候模型 COSMO-CLM 的模拟估算了 2007/2008 年冬季（11 月至 4 月）的冰产量，并将其与遥感估算值进行了比较。使用分数海冰的平铺方法，对冰间湖内考虑的网格尺度和亚网格尺度冰厚度的不同假设进行了参考模拟和五次灵敏度模拟。此外，还研究了热损失对大气边界层的影响。参考模拟估计冬季总冰产量约为 29.1 平方公里，根据薄冰假设，其变化高达 +124%。对于基于冰厚度遥感的最现实的假设，冰产量增加了+39%。如果假设次网格规模的开放水域，使用平铺方法会扩大面积，并将冰间湖的热损失幅度提高至+110%，而对于实际假设则提高+20%。这种增加的热损失反过来导致更高的产冰率并对冰间湖上的大气边界层结构产生更强的影响。研究表明，冰的产生对海冰覆盖率的薄冰参数化高度敏感。总之，可以从我们的模拟中检索出实际的产冰量估计值。忽视次电网规模的能量通量可能会大大低估沿海冰间湖（例如拉普捷夫海）的冰产量，这可能会对北极海冰预算产生影响。
Abstract. The quantification of sea-ice production in the Laptev Sea polynyas is important for the Arctic sea-ice budget and the heat loss to the atmosphere. We estimated the ice production for the winter season 2007/2008 (November–April) based on simulations with the regional climate model COSMO-CLM at a horizontal resolution of 5 km and compared it to remote sensing estimates. A reference and five sensitivity simulations were performed with different assumptions on grid-scale and subgrid-scale ice thickness considered within polynyas, using a tile approach for fractional sea ice. In addition, the impact of heat loss on the atmospheric boundary layer was investigated. About 29.1 km3 of total winter ice production was estimated for the reference simulation, which varies by up to +124 % depending on the thin-ice assumptions. For the most realistic assumptions based on remote sensing of ice thickness the ice production increases by +39 %. The use of the tile approach enlarges the area and enhances the magnitude of the heat loss from polynyas up to +110 % if subgrid-scale open water is assumed and by +20 % for realistic assumptions. This enhanced heat loss causes in turn higher ice production rates and stronger impact on the atmospheric boundary layer structure over the polynyas. The study shows that ice production is highly sensitive to the thin-ice parameterizations for fractional sea-ice cover. In summary, realistic ice production estimates could be retrieved from our simulations. Neglecting subgrid-scale energy fluxes might considerably underestimate the ice production in coastal polynyas, such as in the Laptev Sea, with possible consequences on the Arctic sea-ice budget.
影响因子：
3.6
作者：
Bauch, D.;Dmitrenko, I. A.;Kassens, H.
通讯作者：
Kassens, H.
DOI：
10.3390/rs70505042
发表时间：
2015-04
期刊：
Remote. Sens.
影响因子：
--
作者：
S. Paul;S. Willmes;O. Gutjahr;A. Preußer;G. Heinemann
通讯作者：
S. Paul;S. Willmes;O. Gutjahr;A. Preußer;G. Heinemann
影响因子：
3.6
作者：
Aksenov, Yevgeny;Ivanov, Vladimir V.;Beszczynska-Moeller, Agnieszka
通讯作者：
Beszczynska-Moeller, Agnieszka