QX/T 477-2019 in English
VALIDSand and dust storm,blowing sand and suspended dust identification for meteorological observation
- Issued on:2019-01-26
- Implemented on:2019-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
| Standard No: | QX/T 477-2019 |
| Document status: | VALID |
| Title in English: | Sand and dust storm,blowing sand and suspended dust identification for meteorological observation |
| Title in Chinese: | 沙尘暴、扬沙和浮尘的观测识别 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2019-01-26 |
| Implemented on: | 2019-05-01 |
| ICS Classification: | 07.060-Geology. Meteorology. Hydrology |
| Chinese Classification: | A47-Meteorology |
| Professional Classification: | QX-Meteorology |
| Related Keywords: | dust storm
dust identification blowing sand dust weather level meteorological observation introduction technical background |
| Related Topics: | dust
dust Lao Dust Storm sandstorm dust or Dust northern dust Dust conditions Dust measurement Dust measurement dust box The difference between planktonic bacteria and dust particles Falling sand test |
Introduction
Technical Background of the Standard
This standard, serving as a supporting implementation specification for GB/T 20479-2006, establishes for the first time a quantitative indicator system for assessing the frequent occurrence of sandstorms in northern my country. This standard innovatively introduces the PM10/PM2.5 concentration ratio parameter, resolving the confusion between dust and haze in traditional observations.
Analysis of core terms
| Phenomenon type | Visibility range | Wind speed requirement | Particle matter characteristics |
|---|---|---|---|
| Sandstorm | <1.0km | ≥5.0m/s | PM10>300μg/m³ and PM2.5/PM10<0.5 |
| Blowing sand | 1.0-10.0km | ≥5.0m/s | Same as above |
| Floating dust | <10.0km | <5.0m/s | Same as above |
Key Technical Indicators
Visibility Determination: Visibility is measured using a transmissive visibility meter, which must meet the Class I accuracy standard of GB/T 36542-2018. A typical example is the 2021 Beijing sandstorm, when visibility dropped to 800 meters and wind speeds reached 6.2m/s, triggering a sandstorm warning. Particulate matter monitoring: Beta-ray or oscillating balance monitoring equipment must be used to ensure a PM10 data resolution of ≤1 hour. Data from the Taklamakan Desert Observatory in Xinjiang shows that PM10 concentrations can reach over 2000 μg/m³ during sandstorms.
Key Points for Implementation
- Interference Elimination: Precipitation, smoke and other visibility obstructions must be eliminated first, and the relative humidity must be <50%
- Collaborative Observation: It is recommended to be used in conjunction with GB/T 20480-2017 "Dust Weather Level"
- Equipment Calibration: Wind speed sensors should undergo dynamic response testing every quarter
Comparison of Standard Evolution
| Version | Main Differences | Technological Advances |
|---|---|---|
| GB/T 20479-2006 | Qualitative Description Only | No quantitative indicators |
| QX/T 477-2019 | Increase PM10/PM2.5 ratio | Introduce particle size analysis |
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