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首页> 外文期刊>Estuarine Coastal and Shelf Science >Importance of high resolution wind forcing on eddy activity and particle dispersion in a Norwegian fjord
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Importance of high resolution wind forcing on eddy activity and particle dispersion in a Norwegian fjord

机译：高分辨率风对挪威峡湾涡流活动和颗粒扩散的重要性

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摘要

The circulation in fjords with characteristic branched structure and mountainous surroundings are strongly influenced by the local wind pattern. Sufficiently high atmospheric resolution is needed in weather prediction models to resolve the impacts of the topography on atmospheric circulation. We evaluate the effect of using high versus low resolution atmospheric forcing in a numerical ocean model of Porsangerfjorden in northern Norway. For the high resolution case we applied a weather prediction model (WRF-1km) to downscale the atmospheric flow and in the low resolution case we extracted forcing from the global reanalysis ERA-interim. The results show that the reanalysis provides an unrealistic wind pattern within the fjord and a dynamical downscaling is necessary to capture the observed spatial variability in atmospheric circulation. Coarse wind forcing erroneously gives too frequent wind across the fjord, which affects the computed surface circulation and under-predicts eddy activity. A realistic representation of eddy activity is crucial when modeling transport of planktonic organisms. The cod stock in Porsangerfjorden has declined dramatically since the 1970s. We have modeled particle transport within the fjord, identifying retention areas and drift patterns. The results are discussed focusing on historically known cod spawning and nursery areas in the fjord.
机译：具有特色分支结构和山区环境的峡湾的循环受当地风型的强烈影响。在天气预报模型中需要足够高的大气分辨率，以解决地形对大气环流的影响。我们评估在挪威北部的Porsangerfjorden数值海洋模型中使用高分辨率和低分辨率大气强迫的影响。在高分辨率情况下，我们应用了天气预报模型（WRF-1km）来缩小大气流量，而在低分辨率情况下，我们从全球再分析ERA中期中提取了强迫。结果表明，重新分析在峡湾内提供了一种不切实际的风型，并且有必要进行动态缩小以捕获大气环流中观测到的空间变异性。粗风强迫错误地使整个峡湾的风过于频繁，这会影响计算得出的地表环流并低估了涡旋活动。在对浮游生物的运输进行建模时，涡流活动的真实表示至关重要。自1970年代以来，Porsangerfjorden的鳕鱼存量急剧下降。我们对峡湾内的颗粒运输进行了建模，确定了保留区域和漂移模式。讨论结果时，重点关注峡湾中历史悠久的鳕鱼产卵场和育苗场。

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