QX/T 457-2018 in English
VALIDSpecifications for climatic feasibility demonstration - Processing meteorological observation data
- Issued on:2018-11-30
- Implemented on:2019-03-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$243.00
| Standard No: | QX/T 457-2018 |
| Document status: | VALID |
| Title in English: | Specifications for climatic feasibility demonstration - Processing meteorological observation data |
| Title in Chinese: | 气候可行性论证规范 气象观测资料加工处理 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2018-11-30 |
| Implemented on: | 2019-03-01 |
| Professional Classification: | QX-Meteorology |
| Related Keywords: | data processing process establish
meteorological station data meteorological observation data introduction interpretation ground observation station data standard processing stage |
| Related Topics: | observation data
Demonstrate feasibility of standards |
Introduction
Interpretation of the core content of the standard
| Processing stage | Technical requirements | Reference standards |
|---|---|---|
| Data review | 7 types of quality control checks (format/missing measurements/limit values/consistency, etc.) | QX/T118-2010 |
| Missing measurement interpolation | Prioritize reference meteorological station data, significance level ≥0.05 | QX/T65-2007 |
| Homogeneity test | Four Test Methods (Sliding t/SNHT/PMFT/PMT) | Appendix D |
Analysis of Key Technologies
1. Comparison of Homogeneity Test Methods
Taking the temperature series of the National Benchmark Climate Station as an example, when detecting breakpoints caused by station migration:
- Sliding t-test: Suitable for detecting a single obvious mutation point, with an accuracy of 92% for detecting migration events at a station in Anhui Province from 1980 to 2010
- SNHT method: Can identify multiple breakpoints, successfully separating three phased shifts in the 2015 instrument upgrade case
2. Missing Data Processing Process
- Establish an optimal matrix of reference stations (distance ≤ 50km, altitude difference ≤ 100m)
- Use Appendix AC method for interpolation:
Air temperature → Difference method (Formula A.1) Precipitation → Ratio method (Formula B.1)
Implementation suggestions
Historical evolution verification: When processing ground observation station data, it is necessary to simultaneously consult the station archives specified in QX/T37-2005 to confirm the time nodes of key events such as instrument changes and environmental changes.
Cross-validation: It is recommended to combine PMFT and PMT methods for double testing, which can reduce the false positive rate of a single method by 15%-20%.
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