| 罗金芳,吴君涛,姜敏,张慧娟.鄂东北春季三类典型极端强降水特征分析[J].沙漠与绿洲气象,2024,18(2):44~51 |
| 鄂东北春季三类典型极端强降水特征分析 |
| Analysis of the Characteristics of Three Kinds of Typical Extreme Precipitation in Northeast Hubei in Spring |
| 投稿时间：2022-11-23 修订日期：2023-02-23 |
| DOI： |
| 中文关键词: 春季 极端强降水 异常度 |
| 英文关键词:Spring Extremely heavy precipitation Abnormal degree |
| 基金项目:武汉市气象局科技项目(WHY202202)资助 |
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| 摘要点击次数: 328 |
| 全文下载次数: 172 |
| 中文摘要: |
| 利用1961—2020年降水资料、NCEP／NCAR2.5°×2.5°和ERA5资料，对鄂东北春季极端强降水个例天气系统及物理量的异常度、配置与降水落区的关系进行了分类对比研究。结果发现：(1)鄂东北春季极端强降水有三种典型形势，即地面倒槽型、冷锋前沿型、暖低压型。三类极端强降水过程500 hPa均有南支槽缓慢东移，湖北以东、东北地区到日本有异常强的高压或高压脊，东高西低的形势使降水持续时间长。850 hPa偏南急流异常强盛,鄂东北位于切变辐合区。强降水发生前地面暖低压异常发展，为强降水提供了有利的环境条件。(2)鄂东北大多数春季极端强降水与低层水汽、中低层垂直速度的异常密切相关。鄂东北及周边为低层水汽辐合和垂直速度异常度绝对值之和大值区。 |
| 英文摘要: |
| Based on the precipitation data from 1961 to 2020, NCEP/NCAR and ERA5 data, the relationship between the precipitation area and abnormal degree of the weather system and physical quantity of the spring extremely heavy precipitation event in Northeast Hubei is classified and compared. The results show that: (1) There are three typical situations of extremely heavy precipitation, namely, ground inverted trough type, cold front type and warm low-pressure type. During the process of the three types of extremely heavy precipitation, the 500-hPa south branch trough moves slowly eastward, and there are abnormally strong high pressure or high-pressure ridges from the east of Hubei and Northeast China to Japan, and the east high-pressure situation and low-pressure in the west make the precipitation last for a long time. The 850-hPa southerly jet is abnormally strong, and Northeast Hubei is located in the shear convergence zone. Before the occurrence of heavy precipitation, the abnormal development of ground heating and low pressure provide favorable environmental conditions for extremely heavy precipitation. (2) Most of the spring’s extremely heavy precipitation in Northeast Hubei is closely related to the anomalies of low-level water vapor and low-level vertical velocity. The northeast and surrounding areas of Hubei are the large area of the sum of the absolute values of low-level water vapor convergence and vertical velocity anomaly. |
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