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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Effect of High-Resolution SST on 60km-AGCM Simulated Snowfall in Japan
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Effect of High-Resolution SST on 60km-AGCM Simulated Snowfall in Japan

机译：高分辨率SST对日本60km-AGCM模拟降雪的影响

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References(16) Cited-By(2) Supplementary materials(1) The effects of sea-surface temperature (SST) on snowfall in Japan were investigated using a high-resolution 60-km-mesh atmospheric general circulation model (AGCM). We used a high-resolution SST dataset (original resolution, ～20 km); the high-resolution SST data resolve warm boundary currents, such as those of the Kuroshio and Tsushima warm currents. The AGCM experiment using high-resolution SST data simulates snowfall increase (decrease) over warm (cold) SST regions in January better than the AGCM based on coarse-resolution SST data. A moisture budget analysis shows significant rainfall increase over a warm-SST band along the boundary current, where large evaporative fluxes supply moisture to the atmosphere. On the other hand, the moisture convergence anomaly is generally opposite to that of the evaporative flux anomaly, and hence acts to reduce rainfall. The surface moisture flux change is generally similar to the dynamical term, while the thermodynamic term also plays a non-negligible role. A comparison of satellite observations and AGCM experimental results shows that fine-scale SST variations affect surface wind patterns. Furthermore, we diagnosed surface convergence anomaly using two terms: one that describes the vertical mixing effect and the other that describes the pressure adjustment effect. This analysis shows that both vertical mixing mechanisms and pressure adjustment may contribute to surface convergence anomaly over the Japan Sea.
机译：参考文献（16）被引用的补充资料（2）补充资料（1）使用高分辨率的60公里网眼大气总循环模型（AGCM）研究了日本海面温度（SST）对降雪的影响。我们使用了高分辨率的SST数据集（原始分辨率约为20 km）;高分辨率的SST数据解析出诸如黑潮和对马暖流的暖边界流。使用高分辨率SST数据的AGCM实验比基于粗分辨率SST数据的AGCM更好地模拟了1月温暖（寒冷）SST地区的降雪量（减少）。水分预算分析显示，沿边界电流在温暖的SST带上降雨显着增加，在该处，较大的蒸发通量向大气供应水分。另一方面，水分收敛异常通常与蒸发通量异常相反，因此起到减少降雨的作用。表面水分通量的变化通常类似于动力学项，而热力学项也起着不可忽略的作用。卫星观测结果与AGCM实验结果的比较表明，小尺度的SST变化会影响地面风型。此外，我们使用两个术语诊断了表面会聚异常：一个描述垂直混合效果，另一个描述压力调节效果。该分析表明，垂直混合机制和压力调节都可能导致日本海上的表面收敛异常。

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