| 黄艳,杨莲梅,唐鹏,刘泉泉.新疆伊犁河谷暖季不同历时短时强降水变化特征[J].沙漠与绿洲气象,2024,18(5): |
| 新疆伊犁河谷暖季不同历时短时强降水变化特征 |
| Variation characteristics of flash heavy rain with different durations in the warm seasonof the Yili River Valley in Xinjiang |
| 投稿时间：2023-09-28 修订日期：2024-01-21 |
| DOI： |
| 中文关键词: 伊犁河谷，不同历时，短时强降水，时空分布 |
| 英文关键词:Yili River Valley,different durations, flash heavy rain, spatial and temporal distribution |
| 基金项目:“第三次新疆综合科学考察项目”资助(2022xjkk0601) |
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| 中文摘要: |
| 利用新疆伊犁河谷高密度地面自动站逐小时降水观测资料，对2010-2022年暖季（5-9 月）短时强降水（flash heavy rain,FHR）逐1h、3h和6h时空分布特征进行分析，结果发现:伊犁河谷暖季不同历时短时强降水阈值空间分布具有一致性，1h、3h和6h极端降水阈值的平均值分别为 8.5mm?h-1 、12.6mm?（3h）-1和16.8mm?（6h）-1。不同历时FHR集中发生在5月中旬至8月中旬，其中6月最多,7月次之；不同历时FHR频次发生在中午13：00至下午18：00。不同历时FHR事件最大小时雨强的月分布与发生站次略有差异，除1h最大为62.6mm?h-1出现在7月外，其他雨强均出现在6月分别为89.9mm?（3h）-1、104.5mm?（6h）-1，较大值位于河谷东部和南部。伊犁河谷暖季不同历时FHR空间分布具有明显的不对称性特征，总体呈东高西低的分布格局，在南北方向上1h短时强降水呈北高南低，3h、6h短时强降水均无明显变化趋势。不同历时FHR降水贡献和发生频率的局地差异明显，存在多个大值中心，主要出现在新源县、昭苏县偏北地区、霍城县偏北地区、特克斯县偏西地区、尼勒克县偏西地区及伊宁县中部等地。FHR频次各站虽有显著差异，但未发生明显离散，地形对FHR的增幅作用显著。 |
| 英文摘要: |
| Using hourly precipitation observations from high-density automatic surface stations in the Yili River Valley of Xinjiang, the temporal and spatial distribution characteristics of flash heavy rain (FHR) in the warm season (May-September) from 2010 to 2022 were analyzed on an hourly, three-hourly, and six-hourly basis. The results showed that the spatial distribution of different duration flash heavy rain thresholds in the Yili River Valley was consistent, with the average values of extreme precipitation thresholds at 1h, 3h, and 6h being 8.5mm?h-1, 12.6mm?(3h）-1, and 16.8mm?(6h)-1, respectively. The FHR with different durations in the Yili River Valley occurred mainly from mid-May to mid-August, with the highest number occurring in June and the second highest in July; The
frequency of FHR in different durations occurred from 13:00 noon to 18:00 pm. The monthly distribution of maximum hourly rainfall intensity for different duration FHR events and the number of stations with occurrence are slightly different. Except for the maximum of 62.6mm?h-1 in July, the other rainfall intensities occurred in June, with values of 89.9mm?(3h)-1 and 104.5mm?(6h)-1, respectively. The larger values are located in the eastern and southern parts of the valley. The spatial distribution of FHR over different durations in the Yili River Valley shows obvious asymmetric characteristics, with a generally east-high-west-low distribution pattern. In the north-south direction, 1-hour short-term heavy precipitation is high in the north and low in the south, while there is no significant trend in 3-hour and 6-hour short-term heavy precipitation. There are significant local differences in the amount of FHR, precipitation contribution, and occurrence frequency over different durations, with multiple large value centers mainly located in the north of Xinjiang, including Xinyuan County, Zhaosu County, Huocheng County, the west of Tekes County, the west of Nilka County, and the central part of Yining County. Although there are significant differences in FHR frequency among stations, there is no significant dispersion, and the terrain has a significant effect on the increase in FHR. |
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