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GB/T 20484-2017: Grade of cold air
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 20484-2017	English	109	Add to Cart	3 days [Need to translate]	Grade of cold air
GB/T 20484-2006	English	279	Add to Cart	3 days [Need to translate]	Grading of cold air

GB/T 20484-2017: Grade of cold air

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Grade of cold air ICS 07.060 A47 National Standards of People's Republic of China Replacing GB/T 20484-2006 Cold air rating 2017-05-12 released 2017-12-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People 's Republic of China China National Standardization Management Committee released

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 20484-2006 "cold air rating". Compared with GB/T 20484-2006, in addition to editorial changes, The main technical changes are. - modified the definition of all terms (see Chapter 2, Chapter 2 of the.2006 edition); - combine "medium strong cold air" and "strong cold air" in five cold air grades into a "strong cold air" level (see Table 1, Chapter 3 of the.2006 edition). This standard is proposed by the China Meteorological Administration. The standard by the National Meteorological Disaster Prevention and Disaster Reduction Standardization Technical Committee (SAC/TC345) centralized. The drafting of this standard. National Meteorological Center. The main drafters of this standard. Zhou Qingliang, Li Yanxiang, Lin Yucheng, Zhang Guochen, Qin Huafeng, Liu Xinhua. This standard replaced the previous version of the standard release. --- GB/T 20484-2006.

Introduction

Cold air, especially strong cold air and cold wave is one of China's major disaster weather, with a wide range of effects, long duration, disaster Heavy and so on. The frequent occurrence of cold air will not only cause the national economy, especially the huge loss of agriculture and animal husbandry, but also the environment and people's health Live, health and cause serious impact and harm. In order to unify and regulate the impact of China's cold air classification standards, so that cold air monitoring, forecasting, Police, assessment, research and prevention work more standardized, the development of this standard. Cold air rating

1 Scope

This standard specifies the cold air rating and grading method. This standard applies to cold air monitoring, forecasting, early warning, assessment and scientific research.

2 terms and definitions

The following terms and definitions apply to this document. 2.1 Cold air So that the air at which the temperature has dropped. 2.2 Day minimum temperature dailyminimumtemperature The lowest temperature between 14 o'clock and 14 o'clock on the day before the observation. 2.3 24 hours of temperature reduction rate decreasedofdailyminimumtemperaturein24hours The difference between the daily minimum temperature in the 24 hours after 14.00 and the minimum daily temperature. 2.4 48 hours of temperature reduction rate of lessofdailyminimumtemperaturein48hours The minimum daily minimum temperature in the 48 hours after 14.00 and the minimum temperature of the day. 2.5 72 hours of temperature reduction rate of lessofdailyminimumtemperaturein72hours The minimum daily minimum temperature within 72 hours after 14 o'clock in a day and the difference between the minimum daily temperature.

3 level division

The use of cold air affected by a certain period of time in the minimum daily temperature drop and the minimum daily temperature of the two indicators, the cold air Divided into weak cold air, strong cold air, strong cold air and cold four levels. The division method is shown in Table 1. Table 1 Cold Air Rating Table Classification of indicators Weak cold air daily minimum temperature within 48 hours temperature range is less than 6 ℃ Stronger cold air Day minimum temperature within 48 hours cooling rate greater than or equal to 6 ℃ but less than 8 ℃; or daily minimum temperature within 48 hours of cooling Amplitude greater than or equal to 8 ℃, but failed to make the lowest temperature to 8 ℃ or below Strong cold air daily minimum temperature within 48 hours cooling rate greater than or equal to 8 ℃, and the lowest temperature to the day to 8 ℃ or below Cold wave Day minimum temperature within 24 hours cooling rate greater than or equal to 8 ℃, or 48 hours temperature range greater than or equal to 10 ℃, or 72 hours down the temperature greater than or equal to 12 ℃, and the lowest temperature to the ground to 4 ℃ or below. 48 hours, The minimum daily temperature for cooling within 72 hours should drop continuously ...