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首页> 外文期刊>SOLA: Scientific Online Letters on the Atmosphere >Relation between a Rossby Wave-Breaking Event and Enhanced Convective Activities in August 2016
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Relation between a Rossby Wave-Breaking Event and Enhanced Convective Activities in August 2016

机译：2016年8月罗斯比突浪事件与增强对流活动之间的关系

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This study analyzes a Rossby wave-breaking event east of Japan that enhanced the convective activities over the subtropical western North Pacific Ocean. In August 2016, Rossby-wave packets in the upper troposphere above Eurasia reached over and around the seas east of Japan. The wave-breaking event accompanied the amplification of a blocking ridge and the southward intrusion of upper-level high-potential vorticity (PV) south of the ridge. The high PV (i.e., the enhanced mid-Pacific trough) promoted upward motion and enhancement of convective activities over the subtropical western North Pacific Ocean through a quasi-geostrophic balance. In the lower troposphere, large-scale cyclonic circulation anomalies, including tropical disturbances, were observed south and southeast of Japan, and the anomalies caused significant wet climate conditions in the eastern and northern parts of the country. A linear baroclinic model experiment indicates that the lower-level cyclonic circulation anomalies were the Rossby-wave responses to heating anomalies associated with the enhanced convective activities. These results suggest the existence of dynamic interaction between extratropical and tropical circulation over the western North Pacific Ocean and its influence on boreal summer climate in Japan.
机译：这项研究分析了日本东部的一次罗斯比海浪破裂事件，该事件增强了北亚热带副热带西太平洋的对流活动。 2016年8月，欧亚大陆对流层上方的Rossby波包到达了日本以东的海洋。破波事件伴随着阻塞脊的放大和脊南以南的高层高位涡（PV）的向南侵入。高PV（即增强的中太平洋海槽）通过准地转平衡促进了北亚热带西部太平洋的上升运动和对流活动的增强。在对流层低层，在日本的南部和东南部观察到了大规模的气旋环流异常，包括热带干扰，这些异常在日本东部和北部造成了明显的潮湿气候条件。线性斜压模型实验表明，较低水平的气旋环流异常是与对流活动增强有关的对加热异常的罗斯比波响应。这些结果表明，北太平洋西部上热带和热带环流之间存在动态相互作用，并且对日本夏季的夏季气候有影响。

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