Retrieved Thermodynamic Structure of Hurricane Rita (2005) from Airborne Multi–Doppler Radar Data
Retrieved Thermodynamic Structure of Hurricane Rita (2005) from Airborne Multi–Doppler Radar Data
复制标题
从机载多普勒雷达数据中检索飓风丽塔 (2005) 的热力学结构
DOI：
10.1175/jas-d-20-0195.1
复制
发表时间：
2021
影响因子：
3.1
通讯作者：
M. Bell
中科院分区：
文献类型：
--
作者：
A. Boehm;M. Bell
新开发的利用雷达和飞机仪器-热力学恢复(SAURAI-TR)的中尺度Spline分析用于从RAINEX现场活动期间的多多普勒雷达数据估计2005年9月23日丽塔飓风的三维温度和气压扰动。这被认为是来自TC的第一次全三维网格热力学观测。丽塔此时为主要飓风，受13米S−1级深层垂直风切变影响。分析运动场和反演的热力学场对不同方位波数的贡献，提出在平衡、准平衡和不平衡运动的三级框架内解释眼壁对流强迫。轴对称的波数为0的结构处于热-风平衡状态，导致中心压降和温升较大。波数-1结构是由风暴与环境垂直风切变相互作用决定的，导致切变和切变引起的运动学和热力学扰动之间的准平衡。观测到的波数为1的热力学不对称性证实了前人关于切变倾斜涡旋响应的研究结果，并增加了在波数为1的尺度上垂直运动几乎是流体静力的新证据。高阶波数与眼壁内运动不平衡和对流细胞有关。不平衡垂直加速度与热扰动产生的浮力强迫呈正相关，与相对于平衡涡旋的扰动气压梯度呈负相关。
The newly developed Spline Analysis at Mesoscale Utilizing Radar and Aircraft Instrumentation–Thermodynamic Retrieval (SAMURAI-TR) is used to estimate three-dimensional temperature and pressure perturbations in Hurricane Rita on 23 September 2005 from multi–Doppler radar data during the RAINEX field campaign. These are believed to be the first fully three-dimensional gridded thermodynamic observations from a TC. Rita was a major hurricane at this time and was affected by 13 m s−1 deep-layer vertical wind shear. Analysis of the contributions of the kinematic and retrieved thermodynamic fields to different azimuthal wavenumbers suggests the interpretation of eyewall convective forcing within a three-level framework of balanced, quasi-balanced, and unbalanced motions. The axisymmetric, wavenumber-0 structure was approximately in thermal-wind balance, resulting in a large pressure drop and temperature increase toward the center. The wavenumber-1 structure was determined by the interaction of the storm with environmental vertical wind shear resulting in a quasi balance between shear and shear-induced kinematic and thermodynamic perturbations. The observed wavenumber-1 thermodynamic asymmetries corroborate results of previous studies on the response of a vortex tilted by shear, and add new evidence that the vertical motion is nearly hydrostatic on the wavenumber-1 scale. Higher-order wavenumbers were associated with unbalanced motions and convective cells within the eyewall. The unbalanced vertical acceleration was positively correlated with buoyant forcing from thermal perturbations and negatively correlated with perturbation pressure gradients relative to the balanced vortex.