QX/T 495-2019 in English
VALIDMonitoring indices of rainy season in China-Rainy season in North China
- Issued on:2019-09-18
- Implemented on:2019-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
Introduction
Standard Framework and Technology Evolution
This standard, as a northern regional supplement to the QX/T series rainy season monitoring standards, establishes a unified rainy season monitoring system in North China (Beijing-Tianjin-Hebei, Shanxi, and Inner Mongolia) for the first time. Compared with the traditional empirical judgment method proposed by Zhao Hanguang in 1994, it innovatively introduces a dual-factor judgment model of the position of the subtropical high pressure ridgeline in the northwest Pacific and precipitation.
Analysis of core monitoring indicators
| Indicator type | Beijing-Tianjin-Hebei standard | Shanxi standard | Inner Mongolia standard |
|---|---|---|---|
| Starting threshold | 5-day precipitation ≥35mm and single-day ≥10mm | Same as Beijing-Tianjin-Hebei | 5-day precipitation ≥25mm and single-day ≥10mm |
| Ending threshold | 5-day precipitation ≤35mm in 10 consecutive days | Same as Beijing-Tianjin-Hebei | 5-day precipitation ≤25mm in 10 consecutive days |
| Station ratio threshold | Start 70%/End 60% | Start 60%/End 60% | Start 50%/End 50% |
Intensity classification system
Precipitation level (Formula Z=(P-P₀)/S)
Typical case: In 2016, the Z value of the rainy season in North China reached 2.1, which was a significantly higher level (Ip=5), and the actual precipitation was 120% higher than the climate average
Comprehensive intensity index (Formula M)
Includes three dimensions: relative value of rainy season length (L/L₀), daily precipitation intensity ratio, and precipitation ratio. The critical value 1.25 is the boundary between strong and weak
Mechanism for handling special situations
- Delayed rainy season: When the starting day is later than August 10, the first precipitation day exceeding the climate mean is taken
- Empty rainy season: In 2014, a standard empty rainy season (annual precipitation <100mm) occurred in the monitoring area of Inner Mongolia
Implementation recommendations
- Data quality control: It is recommended to combine automatic weather stations with manual observation data
- Climate benchmark update: According to WMO regulations, the 1981-2010 benchmark value is updated every 10 years
- Regional application: The monitoring area of Inner Mongolia needs to pay special attention to grassland ecological impact assessment
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