QX/T 379-2017 in English
VALIDTechnical guide for monitoring the onset of South China Sea summer monsoon by satellite remote sensing products
- Issued on:2017-06-09
- Implemented on:2017-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$175.00
Introduction
Analysis of the Standard Technical Framework
The QX/T 379-2017 standard establishes a technical system for monitoring the South China Sea summer monsoon based on the FY-2 series geostationary meteorological satellites. The core indicators include:
| Monitoring Indicators | Calculation Elements | Threshold Standards | Physical Significance |
|---|---|---|---|
| Cloud Conducting Wind Index (IAMV) | 150-300hPa Water Vapor Channel Zonal Wind | ≤0 m/s | High-Level Easterly Wind Turn |
| Convective Index (ITBB) | 10.3-12.5μm Channel TBB | ≤280K | Development of Deep Convection |
Detailed Explanation of Key Technical Parameters
1. Satellite Data Requirements
The standard stipulates the use of the following channel data from the VISSR Scanning Radiometer:
- Water Vapor Channel (6.3-7.6μm): Resolution 5000m, used for AMV calculation
- Infrared Window Channel (10-12.5μm): Resolution 5000m, used for TBB inversion
2. Core Algorithm Principles
Cloud Conducting Wind Index Calculation Example: Taking the 2016 monitoring data as an example, when the average zonal wind at the 150-300hPa layer turns to easterly wind (IAMV=-2.3m/s) for 10 consecutive days, combined with TBB≤275K, May 12 is determined to be the outbreak day.
Key Points for Implementation of the Standard
1. Data Processing Specifications
Special attention should be paid to the following:
- Time series requires 5-day moving average processing
- Spatial range is 10°N-20°N, 110°E-120°E
- AMV calculation requires correction for the influence of the Earth's curvature (see Appendix A)
2. Business Application Suggestions
It is recommended to make a comprehensive judgment based on the following factors:
| Auxiliary Indicators | Data Source | Reference Threshold |
|---|---|---|
| OLR | Polar-orbiting Satellite | ≤220 W/m² |
| 850hPa wind field | Reanalysis data | West wind ≥5m/s |
Technology Evolution Analysis
Compared with traditional sounding observations, satellite remote sensing technology has the following advantages:
- Advantages in temporal and spatial resolution: FY-2G visible light channel reaches 1250m
- Continuous monitoring capability: Geostationary satellites observe every 30 minutes
- Parameter complementarity: AMV reflects the dynamic field, and TBB represents the thermal field
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