The impact of latent heat release on synoptic-scale vertical motions and the development of an extratropical cyclone system
The impact of latent heat release on synoptic-scale vertical motions and the development of an extratropical cyclone system
复制标题
潜热释放对天气尺度垂直运动的影响和温带气旋系统的发展
DOI：
10.1175/1520-0493(1984)112
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发表时间：
1984
影响因子：
3.2
通讯作者：
S. Un
中科院分区：
文献类型：
--
作者：
Phillip Smith;P. M. Dare;S. Un
摘要本文研究了稳定潜热释放和对流潜热释放对天气尺度垂直运动的影响，以及在48小时的强发展过程中对流层外气旋的演变。气旋的早期演变受干动力过程控制。然而，到了中期，潜热释放的强迫占了上升垂直运动的50%以上，其中对流分量占主导地位。气旋的发展是最激烈的第二个24小时，尽管减少潜热释放。在后一时期，减少的直接潜热的影响可能已被增强的间接影响，其中预先存在的干动力强迫增强的非绝热涡度和温度梯度。
Abstract This study investigates the influence of stable and convective latent heat release on synoptic-scale vertical motions and the corresponding evolution of an extratropical cyclone during a 48 h period of strong development. The cyclone's early evolution was dominated by dry dynamical processes. By midway through the period, however, forcing by latent heat release accounted for over 50% of the upward vertical motions, with the convective component dominating. The cyclone's development was most intense during the second 24 h, despite a decrease in latent heat release. During the latter period, the reduced direct latent heat influence may have been augmented by an indirect influence, in which pre-existing dry dynamical forcing was enhanced by diabatic intensification of vorticity and thermal gradients.