Diurnal variation characteristics of warm season precipitation in the Bayanbuluke Basin of the Middle Tianshan Mountains
Received date: 2024-02-28
Revised date: 2024-05-08
Online published: 2026-03-11
Diurnal variation in precipitation is a fundamental aspect of climate change, providing valuable insights into its effects on regional water resources. This study analyzes the diurnal precipitation patterns in the Bayanbuluke Basin, Xinjiang, China during the warm season (May-September) from 2017 to 2023, using hourly precipitation data from 18 meteorological observation stations. The findings indicate that the diurnal variation characteristics of precipitation amount, frequency, and intensity during the warm season exhibit overall consistency, albeit with differences across time scales. On an annual scale, precipitation amount and intensity predominantly increase during the day, whereas frequency rises at night. On a monthly scale, all three metrics show significant increases from the afternoon to the first half of the night. During the 18:00—24:00 period, precipitation is not only more frequent but also exhibits higher amounts and intensity, while the 07:00—10:00 period reflects the opposite trend. In the warm season, low-intensity rainfall (R1≤2.0 mm) contributes the most to total precipitation, followed by moderate rainfall (2.1 mm≤R1≤4.0 mm). Regarding precipitation processes (R), light rain (0.1 mm≤R≤6.0 mm) occurs most frequently, yet heavy to torrential rain (R≥12.1 mm) contributes the most to total precipitation. The afternoon period experiences the highest precipitation frequency and contribution. Among different precipitation durations, long-duration events exceeding 6 hours account for the largest contributions, whereas short-duration events (1-3 h) are more frequent, particularly during 15:00—20:00.
Peng DIAO , Xueying ZHOU , NUJIA Nimicairen , Changyong LIU . Diurnal variation characteristics of warm season precipitation in the Bayanbuluke Basin of the Middle Tianshan Mountains[J]. Arid Land Geography, 2024 , 47(12) : 2093 -2103 . DOI: 10.12118/j.issn.1000-6060.2024.128
表1 不同时间尺度下降水量、降水频次和降水强度的相关性Tab. 1 Correlation coefficient of precipitation, precipitation frequency and precipitation intensity at different time scales |
| 相关类别 | 时间尺度 | ||
|---|---|---|---|
| 年 | 月 | 逐时 | |
| 降水量—降水频次 | 0.72* | 0.99** | 0.94** |
| 降水量—降水强度 | 0.31 | 0.96** | 0.93** |
| 降水频次—降水强度 | 0.43 | 0.93* | 0.75** |
注:∗、∗∗分别表示通过了0.05和0.01的置信度检验。 |
图6 不同量级降水过程在各时间尺度中的变化Fig. 6 Changes of precipitation processes of different magnitudes at different time scales |
表2 不同量级降水过程的降水量、频次及持续时间对比分析Tab. 2 Comparative analysis of precipitation amount, frequency and duration of precipitation processes of different magnitudes |
| 降水量级/mm | 降水贡献率/% | 降水频率/% | 持续时间占比/% | 平均降水量/mm·次-1 | 平均持续时间/h·次-1 |
|---|---|---|---|---|---|
| 0.1≤R≤6.0 | 36.12 | 85.64 | 59.83 | 1.21 | 2.51 |
| 6.1≤R≤12.0 | 25.81 | 8.67 | 19.41 | 8.53 | 8.05 |
| R≥12.1 | 38.07 | 5.69 | 20.77 | 19.20 | 13.15 |
注:R为降水量。下同。 |
表3 不同量级降水过程发生时段统计表Tab. 3 Statistical table of occurrence time of precipitation processes of different magnitudes |
| 时段 | 类别 | 降水量级/mm | 总计 | ||
|---|---|---|---|---|---|
| 0.1≤R≤6.0 | 6.1≤R≤12.0 | R≥12.1 | |||
| 上午 | 总降水量/mm | 142.64 | 94.46 | 116.36 | 353.47 |
| 总降水频次/次 | 125.44 | 11.22 | 6.61 | 143.28 | |
| 总持续时间/h | 315.67 | 90.44 | 65.11 | 471.22 | |
| 下午 | 总降水量/mm | 199.63 | 140.27 | 194.43 | 534.33 |
| 总降水频次/次 | 151.94 | 16.39 | 10.44 | 178.78 | |
| 总持续时间/h | 357.78 | 129.72 | 124.89 | 612.39 | |
| 前半夜 | 总降水量/mm | 161.36 | 124.02 | 198.80 | 484.17 |
| 总降水频次/次 | 116.06 | 14.56 | 9.50 | 140.11 | |
| 总持续时间/h | 328.89 | 115.83 | 131.28 | 576.00 | |
| 后半夜 | 总降水量/mm | 89.19 | 64.79 | 115.32 | 269.30 |
| 总降水频次/次 | 96.89 | 7.50 | 6.00 | 110.39 | |
| 总持续时间/h | 230.50 | 63.56 | 86.67 | 380.72 | |
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