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GB/T 41165-2021Accuracy evaluation methods of marine forecast results (English PDF)

海洋预报结果准确性检验评估方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

December 31, 2021

Implementation date

July 1, 2022

Scope

GB/T 41165-2021 is the English-translated version of 海洋预报结果准确性检验评估方法.

GB/T 41165-2021 gives the methods for checking and evaluating how accurate marine forecasts and warnings are along China's coasts and offshore waters.

It sets the general provisions - principles, data, forecast periods, elements and time limits - and then the method for each element: wind speed and direction at the sea surface, wave height and direction, surface seawater temperature, storm surge warnings with tide level assessment, wave warnings with alarm wave height, and sea ice warning levels.

An informative annex gives the conversion tables between forecast wind levels, observed wind speeds and wind or wave directions. It does not apply to the accuracy of numerical prediction results. It was issued on 31 December 2021 and has applied since 1 July 2022.

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Document preview — GB/T 41165-2021

National Standard of the People's Republic of China

ICS: 07.060
Classification: A 45

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1 Scope
2 Normative references
3 Terms and Definitions
4 General Provisions
4.1 Basic Principles
4.2 Data application
4.3 Forecast period
4.4 Inspection and evaluation elements
4.5 Inspection and Evaluation Time Limit
4.6 Relevant regulations on inspection and evaluation results
5 Inspection and evaluation method of sea surface wind
5.1 Wind speed inspection and evaluation
5.2 Wind direction inspection and evaluation
6 Wave inspection and evaluation method
6.1 Wave height inspection and evaluation
6.2 Evaluation of wave direction inspection
7 Inspection and evaluation method of surface seawater temperature
7.1 Surface seawater temperature conversion
7.2 Absolute error of surface seawater temperature
7.3 Surface seawater temperature assessment
7.4 Surface seawater temperature inspection
8 Storm surge warning verification and evaluation method
8.1 Inspection and evaluation of storm surge warning level
8.2 Tidal level assessment
8.3 Tidal assessment
9 Wave Warning Verification and Evaluation Method
9.1 Inspection and evaluation of wave warning level
9.2 Alarm wave height assessment
10 Sea ice warning assessment method
10.1 Sea ice warning level conversion
10.2 Absolute error of sea ice warning level
10.3 Assessment of sea ice alert levels
Appendix A (Informative) Conversion Table
A.1 Conversion table of forecast wind level, estimated wind level and estimated wind speed value
A.2 Conversion table of observed wind speed value and observed wind series
A.3 Conversion table of forecast wind direction/wave direction (azimuth) and estimated wind direction/wave direction (degree)
Reference

Foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1. Structure and Drafting Rules of Standardization Documents" drafted.

1 Scope

This document specifies the elements, timeliness, technical methods and application of the required observational data for the verification and evaluation of the accuracy of marine forecast results.

This document is applicable to the marine prediction of five elements of sea surface wind, waves, storm surge, surface sea temperature and sea ice in China's coastal and offshore waters.

The test and evaluation of the accuracy of the report and alarm results are not applicable to the test and evaluation of the accuracy of the numerical prediction results.

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document.

GB/T 14914.2 Ocean Observation Specification Part 2. Coastal Observation

GB/T 15920 Oceanographic Terminology Physical Oceanography

GB/T 17839 Code for Verification of Alert Tide Levels

GB/T 19721 (all parts) Marine forecast and warning release

3 Terms and Definitions

GB/T 14914.2, GB/T 15920, GB/T 17839, GB/T 19721 (all parts) and the following terms and definitions are applicable used in this document.

3.1 Forecast validity

The validity period of the forecast.

3.2 Forecast period

The text that defines a specific period of time and its corresponding time range in forecasting work.

Note: The forecast period includes daytime, nighttime, morning, morning, noon, afternoon, evening, first half of the night, midnight, and second half of the night. The specific time range is shown in Table 1.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 21 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 19721

Similar standards

GB/T 20481-2026|GB/T 20486-2026|GB/T 22482-2026|GB/T 28593-2026|GB/T 33670-2026|GB/T 33675-2026

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