GB/T 21983-2020 English PDF

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GB/T 21983-2020: Warm winter grades
Status: Valid

GB/T 21983: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21983-2020	189	Add to Cart	3 days	Warm winter grades	Valid
GB/T 21983-2008	319	Add to Cart	3 days	Warm winter grade	Obsolete

Similar standards

GB/T 37254   GB/T 33679   GB/T 33673   GB/T 21987   GB/T 21984   

Basic data

Standard ID: GB/T 21983-2020 (GB/T21983-2020)
Description (Translated English): Warm winter grades
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A47
Classification of International Standard: 07.060
Word Count Estimation: 10,114
Date of Issue: 2020-07-21
Date of Implementation: 2020-07-21
Older Standard (superseded by this standard): GB/T 21983-2008
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 21983-2020: Warm winter grades

---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.
Warm winter grades ICS 07.060 A47 National Standards of People's Republic of China Replace GB/T 21983-2008 Warm winter grade 2020-07-21 released 2020-07-21 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Table of contents

Foreword Ⅰ 1 Scope 1 2 Terms and definitions 1 3 Warm winter classification, judgment and classification 2 Appendix A (normative appendix) Method for selecting warm winter threshold 3 Appendix B (Normative Appendix) National Warm Winter Index Calculation Method 5 Reference 7

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 21983-2008 "Warm Winter Grade". Compared with GB/T 21983-2008, the main technical The technical changes are as follows. --- Revised the "Scope" chapter (see Chapter 1, Chapter 1 of the.2008 edition); ---Modified the definitions of "warm winter", "single station warm winter threshold", "winter average temperature" and "climate average" (see Chapter 2,.2008 edition 2.1~2.4); ---Added the terms and definitions of "single station", "area", "warm winter index", "effective site" and "effective grid" (see 2.5, 2.6, 2.8~2.10); --- Added "Warm Winter Classification" (see 3.1); ---Modified the definition method of regional strong warm winter and national strong warm winter (see 3.2.2.2, 3.3.2.2, 3.2.2 and 3.3.2 of the.2008 edition); ---Added requirements for regional warm winter assessment sites (see 3.2.2.3); --- Added a description of the coverage of the national warm winter index calculation (see 3.2.3.3); ---Added the regulations for selecting the age of the climatic average of the target year (see Appendix A, A.1); ---Added anomaly calculation formula (see Appendix A, A.4); ---Modified the calculation formulas for the grid spacing and effective grid area of latitude and longitude grid division (see Appendix B, B.1,.2008 edition, 3.3. 1.1, 3.3.1.2); ---The calculation method of the National Strong Warm Winter Index has been added (see Appendix B, B.6 and B.7). This standard was proposed by the China Meteorological Administration. This standard is under the jurisdiction of the National Climate and Climate Change Standardization Technical Committee (SAC/TC540). Drafting organization of this standard. National Climate Center. The main drafters of this standard. Chen Yu, Xiang Yang, Zou Xukai, Wang Ling. The previous versions of the standard replaced by this standard are as follows. ---GB/T 21983-2008. Warm winter grade

1 Scope

This standard specifies the determination method and classification of single station, regional and national warm winter. This standard is applicable to the monitoring, forecasting, evaluation and service of warm winter.

2 Terms and definitions

The following terms and definitions apply to this document. 2.1 Average temperature in winter The average temperature from December of the previous year to February of the current year (target year). Note. The unit is degrees Celsius (°C). [GB/T 33675-2017, definition 2.1] 2.2 Climatological normal Climate Annual value The average values of meteorological elements for the most recent 3 consecutive whole years. Note. In accordance with the relevant regulations of the World Meteorological Organization (WMO), it is updated every year, that is, during the period from.2011 to 2020, the 1981-2010 The average value is taken as its climatic average value, and so on. 2.3 Winter average temperature anomaly winterean surface air temperature anomaly The difference between the average winter temperature and its climatic average. Note. The unit is degrees Celsius (°C). 2.4 Warmwinter A climatic phenomenon in which the average temperature in winter is higher than the climatic average to a certain extent. 2.5 Single station weatherstation A certain meteorological observation station, also called station or station. [GB/T 33675-2017, definition 2.4] 2.6 Region A given geographic area. Note 1.Such as administrative regions, climate regions, watershed regions, etc., excluding the entire country. Note 2.Rewrite GB/T 33675-2017, definition 2.5. 2.7 Single station warm winter threshold thresholdofwarmwinterforweatherstation The critical value to determine the warm winter of a single station and its degree. ......

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