当前位置：
X-MOL 学术
›
Atmos. Sci. Lett.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
An observational study of the inner core structure of Typhoon Meranti (2016) near landfall
Atmospheric Science Letters ( IF 2.0 ) Pub Date : 2020-02-27 , DOI: 10.1002/asl.962 Xiping Zhang 1, 2 , Jie Tang 1 , Chenfeng Wu 3 , Dan Wu 1
Atmospheric Science Letters ( IF 2.0 ) Pub Date : 2020-02-27 , DOI: 10.1002/asl.962 Xiping Zhang 1, 2 , Jie Tang 1 , Chenfeng Wu 3 , Dan Wu 1
Affiliation
|
When passing by Taiwan, Typhoon Meranti (2016) was deflected northwards and shrank on infrared images, while its intensity maintained above 50 m⋅s–1 with the radius of maximum wind (RMW) smaller than 30 km. In this paper, satellite and ground‐based dual‐Doppler data were adopted to document Meranti's inner core evolution after its interaction with Taiwan's topography. It was found that the eyewall of Meranti was highly asymmetric on radar reflectivity with maximum on the down motion left side during its landfalling stage in Taiwan Strait, whereas the environmental vertical shear (about 3 m⋅s–1) was not favorable for asymmetry of this strength. As Meranti was very close to Taiwan's southern tip when passing by, its deep convection distribution, especially part on the down motion right side, was impaired by the topography of Central Mountain Range, thus contributed to this asymmetry. The eyewall at 1645 UTC was examined in detail, and it was found that the primary circulation with weaker azimuth perturbations remained intact at this time, while vertical circulation differed with direction. Besides, there was a low level northeast‐southwest flow through the eye, same as the direction of Taiwan Strait. Perhaps this radial inflow, along with the primary circulation, had contributed to the maintenance of asymmetry in reflectivity, so the eyewall did not recover in the Strait despite the weak wind shear. In addition, stronger storm‐relative wind asymmetry in the mid‐troposphere was observed. This wind asymmetry was in favor of track deflection, so was the diabatic heating associated the rainfall asymmetry. The channel wind, along with downslope wind from Taiwan, may help to maintain the intensity of Meranti and the smaller RMW, which needed further investigation with high resolution numerical models.
更新日期：2020-02-27
京公网安备 11010802027423号