Significant Impact of Heat Supply From the Gulf Stream on a “Superbomb” Cyclone in January 2018
Significant Impact of Heat Supply From the Gulf Stream on a “Superbomb” Cyclone in January 2018
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DOI：
10.1029/2019gl082995
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发表时间：
2019-07
影响因子：
5.2
通讯作者：
Hidetaka Hirata;R. Kawamura;M. Nonaka;K. Tsuboki
中科院分区：
文献类型：
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作者：
Hidetaka Hirata;R. Kawamura;M. Nonaka;K. Tsuboki
2018年1月4日，墨西哥湾流上空出现了一个发展极其迅速的温带气旋（“超级炸弹”气旋）。为了阐明超级炸弹气旋增强的关键过程，我们通过进行云解析数值实验，专门研究了来自墨西哥湾流的热量供应的作用。当气旋快速发展时，来自暖流的感热通量和潜热通量在气旋冷传送带（CCB）周围占主导地位。这些通量在地表附近形成了一个对流不稳定层。当气旋中心周围的不稳定释放后，发生了潜热。LH的增加进一步增强了气旋及其相关的CCB。这些结果表明，CCB和LH之间的正反馈过程在墨西哥湾流上空的强化中发挥了关键作用。这样，来自墨西哥湾流的热量供应显著影响了超级炸弹气旋的发展。
On 4 January 2018, an extremely rapidly developing extratropical cyclone (“superbomb” cyclone) appeared over the Gulf Stream. To clarify the key process of the intensification of the superbomb cyclone, we specifically examined the role of heat supply from the Gulf Stream by performing cloud‐resolving numerical experiments. When the cyclone rapidly developed, sensible and latent heat fluxes from the warm current predominated around the cold conveyor belt (CCB) of the cyclone. These fluxes created a convectively unstable layer near the surface. When the instability was released around the cyclone center, latent heating (LH) occurred. The increased LH further intensified the cyclone and its associated CCB. These findings indicate that the positive feedback process between the CCB and LH played a key role in intensification over the Gulf Stream. In this way, the heat supply from the Gulf Stream significantly impacted the development of the superbomb cyclone.