QX/T 393-2017 in English
VALIDMonitoring indices of cold air processes
- Issued on:2017-10-30
- Implemented on:2018-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$175.00
| Standard No: | QX/T 393-2017 |
| Document status: | VALID |
| Title in English: | Monitoring indices of cold air processes |
| Title in Chinese: | 冷空气过程监测指标 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2017-10-30 |
| Implemented on: | 2018-03-01 |
| Professional Classification: | QX-Meteorology |
| Related Topics: | Monitoring indicators
hj/t 393 cold air in late august air index Monitoring indicators process blank process blank process monitoring process monitoring gas phase process how cold the air Foreign air monitoring equipment Atmospheric aerial monitoring process gas Seaside Air Index Performance Monitoring Index bubble process airflow process Air Monitoring Parameters 5 indicators of air air monitor Refrigeration index air monitor monitoring process multi-indicator process Process monitoring and evaluation Monitoring indicators of six parameters of ambient air Saving atmospheric monitoring indicators Airborne Pesticide Residue Monitoring |
Introduction
Interpretation of the core content of the standard
This standard establishes a complete cold air monitoring technology system, and for the first time combines the daily minimum temperature data of national meteorological observation stations with dynamic process judgment. The core innovations are reflected in:
| Technical Dimension | QX/T393-2017 | GB/T20484-2006 |
|---|---|---|
| Monitoring Object | Dynamic Process Monitoring | Single Cold Air Event |
| Judgment Indicator | Temperature Drop in Three Periods + Minimum Temperature Threshold | Temperature Drop in Single Period |
| Regional Judgment | 170 Stations/20% of Stations Continuously Meet the Standards | No Regional Process Definition |
Analysis of Key Technical Indicators
The cold air level at a single station adopts a three-level classification system:
- Moderate intensity: ΔT48≥6℃ and <8℃
- Severe cold air: ΔT48≥8℃
- Cold wave: ΔT24≥8℃ or ΔT48≥10℃ or ΔT72≥12℃ and Tmin≤4℃
Special emphasis is placed on the fact that the 48/72-hour temperature drop must meet the continuous drop condition.
Regional process judgment algorithm
Intensity index formula I=(3N3+2N2+N1)/(N3+N2+N1):
| Parameter | Meaning | Weight coefficient |
|---|---|---|
| N3 | Number of cold wave stations | 3 |
| N2 | Number of strong cold air stations | 2 |
| N1 | Number of medium-intensity stations | 1 |
Recommendations for the implementation of the standard
Application case: Monitoring of the cold wave process in January 2021 showed that the comprehensive intensity index M=2.18 calculated using this standard accurately reflected the super cold wave characteristics of this process, and improved the judgment accuracy by about 23% compared with traditional methods.
Key points of implementation:
- It is necessary to ensure that the time series of meteorological station data is ≥30 years
- Pay attention to the spatial representativeness of the station when making regional judgments
- Cold wave judgment must verify the continuous decrease in temperature
Technological evolution analysis
This standard inherits and develops basic standards such as GB/T20484-2006. The main progress is reflected in:
- Process monitoring replaces single event judgment
- Introduction of dynamic intensity index algorithm
- Establishment of a comprehensive intensity evaluation system
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