GB/T 21987-2017 English PDF

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GB/T 21987-2017: Grade of cold wave
Status: Valid

GB/T 21987: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21987-2017	119	Add to Cart	3 days	Grade of cold wave	Valid
GB/T 21987-2008	279	Add to Cart	3 days	Grades of cold wave	Obsolete

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Basic data

Standard ID: GB/T 21987-2017 (GB/T21987-2017)
Description (Translated English): Grade of cold wave
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A47
Classification of International Standard: 07.060
Word Count Estimation: 6,658
Date of Issue: 2017-10-14
Date of Implementation: 2018-05-01
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 21987-2017: Grade of cold wave

---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 wave ICS 07.060 A47 National Standards of People's Republic of China Replacing GB/T 21987-2008 Cold level 2017-10-14 Published 2018-05-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released Directory Preface Ⅰ Introduction Ⅱ 1 Scope 1 2 Terms and definitions 1 3 cold surge intensity classification 1 Reference 3

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 21987-2008. Compared with GB/T 21987-2008, in addition to editorial changes, the main technical changes as follows. --- Removed normative references (see Chapter 2 of the.2008 edition); --- Removed the terms "cold wave process" "average daily temperature" and "average daily temperature drop range"; revised the term "daily minimum temperature" Definition; added the term "within 24 hours of cooling rate" "48 hours of cooling rate" "72 hours of cooling rate" (see Chapter 2, Chapter 3 of the.2008 edition); --- Modify "Single Station Cold Tide Strength Level" as "Cold Tide Strength Level Division" and delete the original "4.3 Cold Tide", "4.4 Strong Cold Tide" and The "(or average daily temperature)" in "4.5 Extreme cold wave" (see Chapter 3, Chapter 4 of the.2008 edition); --- Removed the "regional cold tide intensity level" and "national cold tide intensity level" two chapters and all contents (see the.2008 edition of Chapter 5 and Chapter 6). This standard is proposed by China Meteorological Administration. This standard by the National Meteorological Disaster Prevention and Mitigation Standardization Technical Committee (SAC/TC345) centralized. This standard drafting unit. Xinjiang Uygur Autonomous Region Meteorological Bureau, National Meteorological Center. The main drafters of this standard. Wei Rongqing, Zong Zhiping, Tang Ye. This standard replaces the standards previously issued as. --- GB/T 21987-2008.

Introduction

Cold wave is one of the major disastrous weather, it has the characteristics of large temperature range, wide range of impact, serious disaster and so on, not only will cause nationals Economy, especially agriculture and forestry, animal husbandry production, but also on people's lives, health have a serious impact and harm. for To unify and standardize the grading standards that affect cold spell in our country so as to standardize and standardize the forecast, early warning, research and prevention of cold waves In.2008, the preparation of national standards GB/T 21987-2008 "cold level". For a long time, China's meteorologists have done a great deal of research on the cold wave standards. Due to the vast territory of our country, the natural geography around it Different in the environment, cold air activity varies greatly between the north and south, therefore, the cold surge standards adopted by different places are not uniform. The purpose of this standard revision is to simplify GB/T 21987-2008 content, the cold wave forecast, early warning services more standardized, standardized, scientific and operational. Cold level

1 Scope

This standard specifies the cold tide intensity level and its classification. This standard applies to cold wave monitoring, forecasting, alerting and assessment and scientific research.

2 Terms and definitions

The following terms and definitions apply to this document. 2.1 Coldwave Cold weather at high latitudes invaded the middle and low latitudes on a large scale, resulting in intense cooling of the weather. 2.2 Daily minimum temperature dailyminimumtemperature The lowest temperature observed between the 14th day of the previous day and the hour of the 14th of the same day. 2.3 The daily minimum temperature drop range of fire The lowest daily temperature in a fixed period of continuous decline, the lowest temperature in the period of the lowest and the highest value of the difference. 2.4 24-hour decrease in temperature within 24 hours The difference between the daily minimum temperature and the minimum daily minimum temperature within 24 hours after 14.00 on the day. 2.5 48-hour cooling rate decreaseofdailyminimumtemperaturein48hours The difference between the lowest day minimum temperature and the lowest day temperature in 48 hours after 14 o'clock on the day. 2.6 72-hour decrease in temperature decreaseofdailyminimumtemperaturein72hours The difference between the lowest daily minimum temperature and the lowest daily temperature in 72 hours after 14.00 on the day.

3 cold intensity level division

3.1 Division principle Using a certain area affected by the cold wave in a certain period of time the minimum temperature drop and daily minimum temperature of the two indicators to specific cold Tide level. 3.2 intensity level Cold wave is divided into three grades. Cold wave, strong cold wave, exceptionally strong cold wave. 3.3 cold wave So that a place on the minimum temperature within 24 hours of cooling rate ≥ 8 ℃, or within 48 hours of cooling rate ≥ 10 ℃, or 72 hours cooling ......

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