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171.
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173.
Sensitivity of Tropical Cyclone Precipitation to Atmospheric Moisture Content: Case Study of Bilis (2006)
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In this article, the authors used the Weather Research and Forecast model to investigate the sensitivity of tropical cyclone Bilis' total precipitation to ambient water vapor content. The tropical cycl... 相似文献
174.
G.S.GOLITSYN 《大气科学进展》2009,(3)
The goal of this paper is to quantitatively formulate some necessary conditions for the development of intense atmospheric vortices. Specifically, these criteria are discussed for tropical cyclones (TC) and polar lows (PL) by using bulk formulas for fluxes of momentum, sensible heating, and latent heating between the ocean and the atmosphere. The velocity scale is used in two forms: (1) as expressed through the buoyancy flux b and the Coriolis parameter lc for rotating fluids convection, and (2) as expresse... 相似文献
175.
A nondivergent barotropic model (Model 1) and a barotropic primitive equation vortex model (Model 2) are linearized respectively in this paper. Then their perturbation wave spectrums are computed with a normal mode approach to study the instability problem on an appointed tropical cyclone (TC)-like vortex, thereby, the dynamic instability properties of spiral cloud bands of TCs are discussed. The results show that the unstable mode of both models exhibits a spiral band-like structure that propagates away from the vortex outside the radius of maximum winds. The discrete modal instability of the pure vortex Rossby wave can account for the generation of the eyewall and the inner spiral band. The unstable mode in Model 2 has three parts, i.e., eyewall, inner and outer spiral bands. This mode can be interpreted as a mixed vortex Rossby-inertia gravitational wave. The unbalanced property of the wave outside the stagnation radius of the vortex Rossby wave is one of the important reasons for the formation of the outer spiral band in TCs. Accordingly, the outer spiral band can be identified to possess properties of an inertial-gravitational wave. When the formation of unstable inner and outer spiral bands is studied, a barotropic vortex model shall be used. In this model, the most unstable perturbation bears the attributes of either the vortex Rossby wave or the inertial-gravitational wave, depending on the vortex radius. So such perturbations shall be viewed as an unbalanced and unstable mixed wave of these two kinds of waves. 相似文献
176.
177.
IMPACTS OF TWO TROPICAL CYCLONES EXPERIENCING EXTRATROPICAL TRANSITION DURING NORTHWARD PROGRESSION
ON THE RAINFALL OF LIAODONG PENINSULA 总被引:2,自引:1,他引:1
Both of Typhoon Winnie (9711) and Matsa (0509) underwent an extratropical transition (ET)
process when they moved northward after landfall and affected Liaodong Peninsula. However, Matsa
produced half as much rainfall as Winnie, although it struck Liaodong Peninsula directly while Winnie
passed through the Bohai Sea. The relations between the ET processes and the precipitation over Liaodong
Peninsula are examined. The result shows that the precipitation difference between Winnie and Matsa was
closely related to the interactions between the westerly systems and typhoons during their ET processes.
Winnie was captured by the upper westerly trough and then coupled with it when moving to the
mid-latitudes, and the positive anomaly of moist potential vorticity (MPV) was transported downward from
the upper troposphere over the remnant circulation of the tropical cyclone (TC). It was favorable to the
interaction between tropical warm and wet air and westerly cold air, causing convective cloud clusters to
form and develop. The rain belt composed of several meso-β cloud clusters over the Liaodong Peninsula,
resulting in heavy rainfall. On the other hand, Matsa did not couple with any upper trough during its ET
process and the positive anomaly of MPV in the upper troposphere and its downward transfer were weak.
Only one meso-β cloud cluster occurred in Matsa’s rain belt during its ET process that tended to lessen
rainfall over Liaodong Peninsula. 相似文献
178.
影响登陆我国不同区域热带气旋活动的大尺度环流定量分析 总被引:4,自引:1,他引:3
利用日本的JRA-25 (Japanese 25-year Reanalysis) 逐日再分析风场资料以及美国联合台风预报中心的热带气旋(TC)数据, 以厦门为分界点, 分别对影响登陆我国厦门以北和厦门以南TC的西北太平洋副热带高压和季风槽作了相关的环流分析。通过定义副热带高压的西伸脊点和南北脊线指数, 以及季风槽的倾斜和强度指数, 定量研究它们与登陆我国不同区域TC的关系。研究结果表明, 所定义的指数对西北太平洋地区TC的生成位置、能量及登陆我国的路径有很好的指示作用。西北太平洋副高位置东西以及南北位置的偏移对登陆我国厦门以北TC的路径有很大影响; 西北太平洋季风槽线斜率对登陆我国厦门以南TC的路径有一定影响, 且倾斜程度与西北太平洋地区TC平均生成地的南北向偏移有密切的关系, 并且, 西北太平洋季风槽线的平均涡度对于西北太平洋地区TC生成时的能量也有很大影响。 相似文献
179.
利用NOAA-16/AMSU-B三水汽通道微波亮温差和GOES-9红外亮温阈值对热带气旋深厚对流云进行检测,同时利用GOES-9可见光、红外、水汽多光谱通道特征对热带气旋云系进行识别,通过一次台风“蒲公英”个例,对热带气旋在微波和光学遥感图像上的深厚对流云进行分析。结果表明,微波和光学遥感资料均能对热带气旋深厚对流云进行有效识别,检测结果基本一致,但识别出的对流云,微波范围较小,光学遥感范围较大,这可能是由于光学遥感仅能获得云顶信息,将对流云顶部覆盖的卷云错判造成的;即使采用较低亮温阈值,光学遥感也很难将这部分卷云完全分离,而微波对云更具穿透性,在深厚对流云的识别方面具有独特优势;三水汽通道间微波亮温差反映了深厚对流云的发展强度,可间接揭示热带气旋的发展情况。 相似文献
180.
华南登陆热带气旋“珍珠”和“派比安”的对流非对称分布观测分析 总被引:1,自引:1,他引:0
采用广东省中尺度地面气象站和天气雷达的观测资料,对2006年登陆华南的热带气旋(TC)"珍珠"和"派比安"的对流非对称分布进行了分析.结果表明:在登陆TC"珍珠"和"派比安"从登陆前12小时到登陆后6小时期间,强对流主要位于TC中心的"东"、"北"象限,即TC移动路径的右侧和前方;同时TC对流在垂直方向也存在明显的差异.分析还发现,虽然登陆TC"珍珠"和"派比安"都有相同的对流非对称分布,但是引起这种对流非对称分布的原因并不完全相同,登陆TC"珍珠"的对流非对称分布主要与强的环境垂直风切变、低层水平风场切变、低层辐合和辐散的影响有关,而登陆TC"派比安"的对流非对称分布主要与低层辐合和辐散的影响有关. 相似文献