An Examination of the Pressure–Wind Relationship for Intense Tropical Cyclones
An Examination of the Pressure–Wind Relationship for Intense Tropical Cyclones
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DOI：
10.1175/2010waf2222344.1
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发表时间：
2010-06
影响因子：
2.9
通讯作者：
C. Kieu;Hua Chen;Da‐Lin Zhang
中科院分区：
文献类型：
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作者：
C. Kieu;Hua Chen;Da‐Lin Zhang
在本研究中，研究了强烈热带气旋（tc）的压风关系（PWR）的动力约束，特别关注最大地面风（VMAX）和最小海平面压力（PMIN）之间的物理联系。朗肯涡旋的使用表明，行星边界层（PBL）的摩擦强迫可以解释VMAX对压降的线性贡献的相当大一部分。对于小眼尺寸的强tc，这一贡献变得越来越重要，在这种情况下，PBL中的径向流入不能再被忽视。此外，当与表面摩擦耦合时，切向风倾向的包含可以对压降做出额外的贡献。对双眼壁结构的检查表明，外眼壁或组织良好的螺旋雨带的形成使压水堆变得复杂。对飓风Wilma（2005）的云分辨模拟分析表明，即使VMAX恒定，外眼壁也会导致PMIN持续加深。本文的研究结果表明：(1)TC大小应与VMAX耦合，而不是像目前的压水堆那样被视为一个独立的预测因子；(2)TC强度变化至少应与VMAX半径线性耦合；(3)PBL中的径向风与VMAX的线性贡献同等重要，其影响应包括在压水堆中。
In this study, the dynamical constraints underlining the pressure‐wind relationship (PWR) for intense tropical cyclones (TCs) are examined with the particular focus on the physical connections between the maximum surface wind (VMAX) and the minimum sea level pressure (PMIN). Use of the Rankine vortex demonstrates that the frictional forcing in the planetary boundary layer (PBL) could explain a sizeable portion of the linear contributions of VMAX to pressure drops. This contribution becomes increasingly important for intense TCs with small eye sizes, in which the radial inflows in the PBL could no longer be neglected. Furthermore, the inclusion of the tangential wind tendency can make an additional contribution to the pressure drops when coupled with the surface friction. An examination of the double-eyewall configuration reveals that the formation of an outer eyewall or wellorganized spiral rainbands complicates the PWR. An analysis of a cloud-resolving simulation of Hurricane Wilma (2005) shows that the outer eyewall could result in the continuous deepening of PMIN even with a constant VMAX. The results presented here suggest that (i) the TC size should be coupled with VMAX rather than being treated as an independent predictor as in the current PWRs, (ii) the TC intensity change should be at least coupled linearly with the radius of VMAX, and (iii) the radial wind in the PBL is of equal importance to the linear contribution of VMAX and its impact should be included in the PWR.