在 TC 到达以前,这研究使热带气旋(TC ) 导致的降水担心,它将被叫作 TC 遥远的降水(TRP ) 。在 20002009 的6月,7月,和8月期间基于与 45 个 TRP 事件的 TC ,副热带的高度,和 TRP 有关的非旋转的风和分叉风的垂直发行量的分发特征,在这三个实体之中的关系( TC ,副热带的高度,并且 TRP )能被分成四个模式。为 TRP 事件(59%) 的最高的比例的第一篇模式报道,和一个概念的模型然后被为这个模式提供。这个模型的主要特征如下:TC,副热带的高度,和 TRP 能在副热带的高度的山脉线的双方通过分叉风的第二等的发行量与对方一起交往(在副热带的高度和 TC 之间,并且在副热带的高度和 TRP 之间) 。在上面的水平(150 或 200 hPa ) ,从 TC 的向北方非旋转的风向副热带的高山脉线收敛了并且减退,并且在 950 hPa,从副热带的高度的山脉线的分叉的风向 TC 收敛了;这些构造了在 TC 和副热带的高度之间的第二等的发行量。同时,在从 TRP 的上面的水平(150 或 200 hPa ) 的向南方的 nonrotational 风和在从向 TRP 的副热带的高山脉线的 950 hPa 的分叉的风构造了在 TRP 和副热带的高度之间的第二等的发行量。当 TC 和 TRP 与对方一起交往了,副热带的高山脉线通常在整个空气的 downdraft 区域下面。另外的三个模式以紧张主要与第一个模式不同并且 non-rotational-wind 放第二等的循环。北京 721 暴风雨的数字模拟在 TC,副热带的高度,和 TRP 之中证实了关系,显示当相互作用变弱时, TRP 也变弱。
This study concerns the precipitation induced by a tropical cyclone (TC) before the TC arrives, which will be referred to as TC remote precipitation (TRP). Based on the distribution characteristics of the non-rotational wind and the divergent-wind vertical circulation related to TC, the subtropical high, and TRP of 45 TRP events during June, July, and August of 2000-2009, the relationships among these three entities (TC, subtropical high, and TRP) can be categorized into four patterns. The first pattern accounts for the highest proportion of the TRP events (59%), and a conceptual model is then provided for this pattern. The primary characteristics of this model are as follows: TC, the subtropical high, and TRP can interact with each other through the divergent-wind secondary circulation at both sides of the ridge line of the subtropical high (between the subtropical high and TC, and between the subtropical high and TRP). At the upper level (150 or 200 hPa), the northward non-rotational wind from the TC converged toward the subtropical high ridge line and subsided, and at 950 hPa the divergent wind from the ridge line of the subtropical high converged toward TC; these constructed the secondary circulation between TC and the subtropical high. In the meantime, the southward non- rotational wind at the upper level (150 or 200hPa) from TRP and the divergent wind at 950hPa from the subtropical high ridge line toward TRP constructed the secondary circulation between TRP and the subtropical high. As TC and TRP interacted with each other, the subtropical high ridge line was usually under the down- draft area of the whole atmosphere. The other three patterns are different from the first pattern mainly in terms of the intensity and position of the non-rotational-wind secondary circulation. The numerical simulation of the Beijing 7.21 rainstorm confirmed the relationship amongTC, the subtropical high, and TRP, indicating that when the interaction weakened, the TRP also weakened.