双月刊

ISSN 1006-9895

CN 11-1768/O4

江淮流域暖切变型暖区暴雨的客观识别与分析
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1.南京信息工程大学气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心;2.华东地区空中交通管理局安徽分局

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Objective Identification and Analysis of Warm-Sector Rainstorm with Warm Shear Pattern over Yangtze-Huaihe River Region
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1.Key Laboratory of Meteorological Disaster,Ministry of Education/Joint International Research Laboratory of Climate and Environment Change/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology;2.Air Traffic Management Bureau,Anhui Province in east China branch

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    摘要:

    暖切变型暖区暴雨(WSWR)是存在暖式切变线作为天气背景的暖区暴雨(WR)类型。本研究基于WR与切变线的定义,综合中尺度暴雨团(CRA)、锋面、切变线等客观识别标准,利用中国自动站与CMORPH降水产品融合的逐小时网格数据集以及ERA5的再分析资料对2010~2017年的江淮流域WSWR进行客观识别与验证。8年共确定WR雨团1268个,WSWR雨团451个,其高频区位于皖赣鄂三省交界处及江浙沿海区域,且WSWR雨团与WR雨团的频次大值区分布基本一致。WSWR雨团多出现在6月中旬到7月中旬,此期间WR雨团中40%以上是WSWR雨团,雨团出现的位置随主雨带一致向北推进,其平均最大降水量为29mm/h。WSWR出现频次的日变化呈现双峰结构,分别出现在08~13时、20~22时(LST),雨团的小时降水量高峰值主要出现在午后(13~19时LST)和清晨(01~05时LST)。

    Abstract:

    The warm-sector rainstorm (WR) with warm shear pattern (WSWR) over Yangtze-Huaihe river region were studied in this paper. Based on the definition of WR and shear-line, and the objective identification criteria of meso-scale rainstorm cluster (CRA), front and shear-line, this study use the merged rain gauge-satellite gridded hourly precipitation dataset and ERA5 reanalysis data to identify the WSWR over Yangtze-Huaihe River Basin (YHRB) during 2010~2017. A total of 1268 WR clusters have been identified over the 8 years. There are 451 WSWR clusters of the total WR clusters, and frequently occur over the junction of the Anhui, Jiangxi, and Hubei province and the coastal areas of Jiangsu and Zhejiang province. In addition, the WSWR clusters exhibit similar horizontal distribution with the WR clusters over YHRB. The WSWR clusters occur mainly from mid-June to mid-July. During this period, the WSWR clusters, with averaged hourly precipitation of 29mm, account for more than 40% of the total WR clusters and gradually move northward, consistent with the migration of the main rainfall belt. The occurrence of WSWR clusters show significant diurnal variation, with one peak from morning to early-afternoon (0800~1300 LST) and the other after sunset (2000~2200 LST). The maximum precipitation of WSWR clusters appeared during afternoon (1300~1900 LST) and early morning (0100~0500 LST), respectively.

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  • 收稿日期:2021-11-24
  • 最后修改日期:2022-07-06
  • 录用日期:2022-07-28
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