Comparing Frontal Structures of Extratropical Cyclones in the Northwestern Pacific and Northwestern Atlantic Storm Tracks
Comparing Frontal Structures of Extratropical Cyclones in the Northwestern Pacific and Northwestern Atlantic Storm Tracks
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DOI：
10.1175/mwr-d-21-0181.1
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发表时间：
2021-11
影响因子：
3.2
通讯作者：
Eigo Tochimoto;H. Niino
中科院分区：
文献类型：
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作者：
Eigo Tochimoto;H. Niino
在西北太平洋风暴轴发展的热带气旋的锋面结构，相对于那些在欧洲和大西洋，有代表性的概念模型已经开发出来的了解较少。本文利用日本55年再分析资料，研究了西北太平洋（NP）、鄂霍次克海和日本海（OJ）气旋及其相关锋面在发展和成熟阶段的结构。此外，在NP的锋面结构进行了比较，在西北大西洋（NA）。在最大加深率的时候，在NP的气旋伴随着强的暖锋和冷锋，而在OJ的气旋更频繁地伴随着冷锋比暖锋，往往有更强的冷锋比暖锋。赤道气旋东部和东北部的暖锋弱于冷锋，可能是由于气旋向北发展，远离环境位温水平梯度强的区域。通过对北太平洋和北大西洋成熟气旋的比较，发现北大西洋的暖锋倾向于向东北方向延伸，而北太平洋的暖锋则倾向于向东南方向延伸。NP和NA之间的暖锋的这些差异被认为是由于NP和NA之间的暖流的水平结构的差异。
The frontal structures of extratropical cyclones developing in the Northwestern Pacific storm track are relatively poorly understood compared with those in Europe and the Atlantic Ocean, for which representative conceptual models have been developed. In this paper, the structures of cyclones and their associated fronts in the Northwestern Pacific (NP), as well as in the Okhotsk Sea and Sea of Japan (OJ), are examined at their developing and mature stages using Japanese 55-year reanalysis dataset. Furthermore, the frontal structures in the NP are compared with those in the Northwestern Atlantic (NA). At the time of maximum deepening rate, cyclones in the NP are accompanied by strong warm and cold fronts, whereas cyclones in the OJ are more frequently accompanied by cold fronts than by warm fronts and tend to have stronger cold fronts than warm fronts. The weaker warm fronts than cold fronts to the east and northeast of cyclones in the OJ is likely due to the cyclones developing to the north and away from the region where the horizontal gradient of environmental potential temperature is strong. A comparison between mature cyclones in the NP and NA shows that the warm fronts in the NA tend to extend northeastward, whereas those in the NP extend more southeastward. These differences in warm fronts between NP and NA are suggested to be due to the difference in the horizontal structures of the warm currents between NP and NA.