Separation and spatial variations of typhoon and non-typhoon rainfall at different timescales in typical region of southeast China

IF 3.5 3区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES International Journal of Climatology Pub Date : 2024-08-18 DOI:10.1002/joc.8599
Senzhen Wang, Xingwei Chen, Huaxia Yao, Weifang Ruan, Zipeng Gu, Xiaocheng Li, Ying Chen, Meibing Liu, Haijun Deng
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Abstract

Rainfall in East Asia is affected by two rain-bearing systems: tropical cyclones and monsoon-related frontal systems. Distinguishing typhoon rainfall (TR) and non-typhoon rainfall (non-TR) helps to understand the evolution process of regional rainfall at different timescales. Taking Fujian Province in the southeast coast of China as an example, based on the fixed box approach of separating TR, the method of determining the size of fixed box is explored. TR and non-TR are separated in Fujian Province, and the spatial variations of TR and non-TR at different timescales (annual, monthly, day of annual-maximum-rain) are analysed. The results showed that (1) according to the relationship between the sizes of fixed box and the rate of change of TR, the size of fixed box could be reasonably determined; thus, the expended size of fixed box suitable for separating TR in Fujian was 3.5°, namely the range of 20°–31.8°N and 112.3°–124.2°E. (2) The spatial variations of TR at different timescales in Fujian were similar: TR decreased from the coast to the inland, and the northeast coast of Fujian was the high-value region. Due to the difference of water vapour sources, non-TR in March–June increased from the coast to the inland, but the high value of non-TR in July–September was distributed in the eastern coast. (3) The contribution rates of average TR to the total rainfall of the year, July–September and 1 day were 12.8%, 34.6% and 35.7%, respectively. In eastern coast, TR in July–September accounted for 1/3–1/2 of total rainfall, and the rainfall in a day was mainly affected by TR; while in western inland, rainfall was mainly non-TR and the influence of TR was less than 1/4.

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中国东南典型地区台风与非台风降雨在不同时间尺度上的分离与空间变化
东亚的降雨量受两个降雨系统的影响:热带气旋和与季风相关的锋面系统。区分台风降雨(TR)和非台风降雨(Non-TR)有助于了解不同时间尺度下区域降雨的演变过程。以我国东南沿海的福建省为例,在采用固定方框法分离台风降雨的基础上,探讨了固定方框大小的确定方法。将福建省的 TR 和非 TR 区分开来,分析了不同时间尺度(年、月、年最大降雨日)下 TR 和非 TR 的空间变化。结果表明:(1)根据固定箱尺寸与 TR 变化率之间的关系,可以合理确定固定箱的尺寸,因此,适合于分离福建省 TR 的固定箱的极限尺寸为 3.5°,即 20°-31.8°N、112.3°-124.2°E 范围。(2)福建不同时间尺度的 TR 空间变化相似:TR 从沿海向内陆递减,福建东北沿海为高值区。由于水汽源的差异,3-6 月的非 TR 值从沿海向内陆增加,但 7-9 月的非 TR 高值分布在东部沿海。(3)平均 TR 对全年、7-9 月和 1 日总降雨量的贡献率分别为 12.8%、34.6% 和 35.7%。在东部沿海,7-9 月 TR 占总降雨量的 1/3-1/2,一日降雨量主要受 TR 影响;而在西部内陆,降雨量主要为非 TR,TR 的影响小于 1/4。
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来源期刊
International Journal of Climatology
International Journal of Climatology 地学-气象与大气科学
CiteScore
7.50
自引率
7.70%
发文量
417
审稿时长
4 months
期刊介绍: The International Journal of Climatology aims to span the well established but rapidly growing field of climatology, through the publication of research papers, short communications, major reviews of progress and reviews of new books and reports in the area of climate science. The Journal’s main role is to stimulate and report research in climatology, from the expansive fields of the atmospheric, biophysical, engineering and social sciences. Coverage includes: Climate system science; Local to global scale climate observations and modelling; Seasonal to interannual climate prediction; Climatic variability and climate change; Synoptic, dynamic and urban climatology, hydroclimatology, human bioclimatology, ecoclimatology, dendroclimatology, palaeoclimatology, marine climatology and atmosphere-ocean interactions; Application of climatological knowledge to environmental assessment and management and economic production; Climate and society interactions
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