QX/T 371-2017 in English
VALIDIndex of atmospheric blocking high
- Issued on:2017-02-10
- Implemented on:2017-06-15
- File Format:PDF
- Delivery:Via email within 1~3 business days
$146.00
| Standard No: | QX/T 371-2017 |
| Document status: | VALID |
| Title in English: | Index of atmospheric blocking high |
| Title in Chinese: | 阻塞高压监测指标 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2017-02-10 |
| Implemented on: | 2017-06-15 |
| ICS Classification: | 07.060-Geology. Meteorology. Hydrology |
| Chinese Classification: | A47-Meteorology |
| Professional Classification: | QX-Meteorology |
| Related Keywords: | high introduction standard overview
high pressure standardized intensity index european blocking event intermittent blocking |
| Related Topics: | block
Monitoring indicators HF Zeeman HF Zeeman Monitoring indicators high voltage test Autoclave Monitoring QX Hot pressed iron detection index Performance Monitoring Index High pressure indicator Saving atmospheric monitoring indicators Rotor blocked High temperature and high voltage resistance wire |
本标准规定了阻塞高压的客观确定方法。 本标准适用于北（南）半球中高纬度阻塞高压监测。
Introduction
Standard Overview and Technical Background
QX/T 371-2017 specifies the analysis method of the 500 hPa potential height field for monitoring blocking high pressure, filling the gap in the standard for monitoring persistent circulation anomalies in my country. The standard is based on the latest research results of the World Meteorological Organization (WMO) on blocking high pressure and is formulated in combination with the observation data of the National Climate Center of my country in the past 20 years.
Analysis of core monitoring indicators
| Indicator type | Northern Hemisphere parameters | Southern Hemisphere parameters | Calculation method |
|---|---|---|---|
| Altitude gradient | GHGS>0, GHGN<-10gpm/° | GHGS>0, GHGN<-10gpm/° | Formula (1)-(7) |
| Spatial requirements | Continuous ≥12.5° longitude | Continuous ≥12.5° longitude | 5 grid points |
| Duration | ≥5 days (1 day of interruption allowed) | Appendix A | |
Key Technology Implementation
Data Preprocessing Requirements
The standard explicitly requires the use of 2.5°×2.5° or higher resolution grid data, and must be processed with a 5-day sliding average. For example, in the analysis of the northern hemisphere blocking event in June 2010, downscaling was required when using ECMWF's 0.25° high-resolution data.
Intensity quantification method
The standardized intensity index is calculated by equations (11)-(12):
I = 100×(Hc - Havg)/Havg
where Hc is the central potential height and Havg is the average value of upstream and downstream. In the case of East Asian blocking high in July 2012, the intensity was measured to be 35%, resulting in continuous heavy rains in the Yangtze River Basin.
Implementation recommendations
- Data quality control: It is recommended to integrate reanalysis data (such as ERA5) with real-time observation data
- Automated discrimination: Develop an automatic tracking algorithm for spatiotemporal continuity based on Chapter 5 of the standard
- Forecast application: Incorporate blocking index into the extended-range forecast model, referring to the 72-hour warning case of the European blocking event in 2013
Standard evolution direction
Compared with the 2007 trial method, the main improvements of this standard include:
1. Increase applicability to the southern hemisphere (Article 4.2.2)
2. Refine the rules for handling intermittent blocking (Article 5.1c)
3. Introduce standardized intensity indicators (Article 5.3)
Future revisions should considerHigh Resolution Mode outputs data for direct application needs.
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