GB/T 34293-2017 in English
VALIDMonitoring indices of low temperature extremes and temperature drop extremes
- Issued on:2017-09-07
- Implemented on:2018-04-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 34293-2017极端低温和降温监测指标》由TC540（全国气候与气候变化标准化技术委员会）归口，主管部门为中国气象局。
Introduction
GB/T 34293—2017 Interpretation and Application of the Standard
Background of Standard Formulation
With the intensification of global climate change, the impact of extreme low temperature and cooling events on agriculture, ecology and human life is becoming increasingly significant. GB/T 34293—2017 "Monitoring Indicators for Extreme Low Temperature and Cooling" aims to provide unified technical specifications for scientific assessment and response to these extreme meteorological events.
Overview of the Standard Framework
| Chapter | Abstract | Key Indicators |
|---|---|---|
| Chapter 1 Scope | Specifies the monitoring indicators and calculation methods for daily extreme low temperature, extreme daily cooling and extreme continuous cooling at a single station. | Daily minimum temperature, daily temperature drop, continuous temperature drop |
| Chapter 2 Terms and Definitions | Defines key terms such as climate standard period, percentile, extreme threshold, etc. | Climate standard period (such as 1981-2010), daily temperature drop, continuous temperature drop |
| Chapter 3 Monitoring Indicators | Defines and calculation methods for extreme low temperature, extreme daily temperature drop and extreme continuous temperature drop. | Low temperature extreme threshold, daily temperature drop extreme threshold, continuous temperature drop extreme threshold |
Technical points analysis
1. Determination method of extreme threshold
The standard uses the percentile method to determine the extreme threshold:
- Low temperature extreme threshold: Take the minimum and second minimum values of the daily minimum temperature during the climate standard period, sort and take the 5th percentile.
- Daily temperature drop extreme threshold: Take the maximum daily temperature drop in the year, sort and take the 95th percentile.
- Continuous temperature drop extreme threshold: Take the maximum continuous temperature drop in the year, sort and take the 95th percentile.
Implementation Recommendations
Data Collection and Processing:Ensure the integrity and accuracy of meteorological observation data and establish a long-term monitoring database.
Threshold Calculation:Use standardized methods and adjust the threshold range in combination with regional climate characteristics.
Probability Model Application:Use the generalized extreme value distribution (GEV) theory to calculate the return period and provide a scientific basis for risk assessment.
Early Warning System Construction:Establish an early warning mechanism based on monitoring indicators to enhance the ability to respond to extreme weather.
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