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本文利用中国地面高时空分辨率的降水资料，分析台风“利奇马”(Lekima)登陆期间，其外雨带在浙江沿海地区产生的降水特征。结果表明，“利奇马”外雨带影响下浙江地区降水过程的累计降水、分钟雨强均呈现显著极端性，强降水中心呈现带状分布特征，在空间和时间上具有明显的非均匀性。同时，本次降水呈现出多种时间尺度的波动特征，周期128～192 min的波动信号贯穿了整个降水过程。外雨带主要位于台风移动方向前侧，其不同位置的降水波动特征有所不同，雨带外边缘降水小波功率谱有两个明显的大值中心，即除周期128～192 min波动信号外，还有准周期16～64 min的波动特征；雨带内侧则分为周期128～256 min的波动信号和多个周期在16 min以下的高频波动信号。本文的研究对提高登陆台风的降水精细化预测水平有重要意义。
Abstract：Based on the precipitation data of high spatial and temporal resolution on the ground in China, the precipitation characteristics generated by the outer rainband of typhoon Lekima in the coastal areas of Zhejiang during its landfalling were analyzed. The results showed that the cumulative precipitation, minute rain intensity and process precipitation in the precipitation process in Zhejiang under the influence of the outer rainband of typhoon Lekima showed significant extremes, and the heavy precipitation center showed a zonal distribution. It has obvious non-uniformity in space and time. At the same time, the precipitation showed a variety of scale fluctuation characteristics, and the wave signal with a period of 128 to 192 min ran through the whole precipitation process. The outer rainband is mainly located in front of the typhoon moving direction, and the precipitation fluctuation characteristics are different at different locations. The wavelet power spectrum of precipitation at the outer edge of the rainband shows two obvious large value centers, that is, in addition to the periodic signal of 128～192 min, there is also a quasi-periodic wave characteristic of 16～64 min. In addition to the periodic 128～256 min wave signal, there are a number of high-frequency wave signals with a period below 16 min inside the rainband. These findings are of scientific value for understanding the distribution and evolution of fine structure of typhoon precipitation.
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基本信息:
DOI：10.16441/j.cnki.hdxb.20240055
中图分类号:P426.6;P444
引用信息:
[1]彭成祥,端义宏,冯佳宁.2019年超强台风“利奇马”外雨带降水精细结构分析[J].中国海洋大学学报(自然科学版),2025,55(03):1-12.DOI:10.16441/j.cnki.hdxb.20240055.
基金信息:
国家自然科学基金项目(42192554,61827901); 中国气象科学研究院科技发展基金项目(2022KJ012);中国气象科学研究院基本科研业务费项目(2022Y006); 上海台风研究基金项目(TFJJ202210)资助~~