Partners save 15% on every standard

Valid

GB/T 44955-2024Climate prediction verification—El Nino/La Nina (English PDF)

气候预测检验厄尔尼诺/拉尼娜

Open the GB/T 44955-2024 preview as PDF

Preview — first pages of GB/T 44955-2024 (full document: 15 pages)

This is a limited preview

Buy now to download the full PDF (15 pages)

Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

November 28, 2024

Implementation date

March 1, 2025

Scope

GB/T 44955-2024 is the English-translated version of 气候预测检验厄尔尼诺/拉尼娜.

GB/T 44955-2024 is the Chinese national standard covering the scoring of an El Nino or La Nina forecast against what the ocean actually did — the hindcast test and the real-time forecast test, the variables taken from the monthly mean NINO3.4 index and the sea surface temperature anomaly behind it, the indicators computed from them, and the evaluation requirements, which fix how long a hindcast run has to be before its score counts. First edition, under the China Meteorological Administration, with the weather forecast verification standard GB/T 44956-2024. In force from 1 March 2025. Issued on 28 November 2024, it has been in force since 1 March 2025.

Document preview — GB/T 44955-2024

National Standard of the People's Republic of China

ICS: 07.060
Classification: A 47

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

PrefaceIII
1 Scope1
2 Normative references1
3 Terms and Definitions1
4 Historical Return Test1
5 Real-time prediction test2
References4

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 for standardization documents" Drafting.

Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.

This document was proposed by the China Meteorological Administration.

This document is under the jurisdiction of the National Technical Committee on Climate and Climate Change Standardization (SAC/TC540).

This document was drafted by: National Climate Center, 61540 Troops of the Chinese People's Liberation Army, Meteorological Cadre Training Institute of China Meteorological Administration, China People's Liberation Army Unit 61741.

The main drafters of this document are: Lu Bo, Shi Wenjing, Ji Cuiling, Zhang Baichao, Wan Jianghua, Jiang Mingbo, Fan Haiyan and Liu Yanyan.

Climate predictions tested for El Nino/La Nina

1 Scope

This document specifies the variables, indicators and evaluation requirements for the verification of El Niño/La Niña historical returns and real-time forecasts.

This document applies to operations, services and scientific research for El Niño/La Niña climate prediction verification.

2 Normative references

This document has no normative references.

3 Terms and definitions

The following terms and definitions apply to this document.

3.1 [Source. GB/T 33666-2017, 2.1]

The numerical value of the ocean surface temperature.

Note. The unit is Celsius (°C).

3.2 climatologicalnormal

Climate Annual value The average value of meteorological elements in the last three consecutive full decades.

Note. According to the relevant regulations of the World Meteorological Organization (WMO), it is updated every decade, that is, during the period from 2011 to 2020, the 1981-2010 The average is taken as its climate average, and so on.

[Source. GB/T 21983-2020, 2.2]

3.3 Sea surface temperature anomaly SSTanomaly; SSTA

The difference between the sea surface temperature (3.1) and the climate mean (3.2).

3.4 El Niño/La Niña index

A monitoring index for sea surface temperature anomalies (3.3) reflecting El Niño/La Niña phenomena.

Note. Including NINO3.4 index, NINO3 index, NINO4 index, etc.

4 Historical Return Test

4.1 Test variables

The historical returns of El Nino/La Nina climate forecasts (hereinafter referred to as “historical returns”) should be based on historical data with observation samples of more than 18 months.

The monthly average of the NINO3.4 index reported in history and observed is used as the test variable. Among them, the monthly average of the NINO3.4 index should be determined by the sea surface temperature.

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

Editions of GB/T 44955

Edition	Title	Revision	Status
GB/T 44955-2024	Climate prediction verification - El Nino/La Nina	current edition	Current

This page sells the current edition, GB/T 44955-2024. Earlier editions are listed for reference only.

How to Buy GB/T 44955-2024

1Add to cart. Click the "Buy GB/T 44955-2024" button on this page. You can add more standards before checkout.
2Checkout. Enter your email and billing details. Payment is processed securely by Stripe (cards, Apple Pay, Google Pay supported).
3Instant delivery (0–9 sec). Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
4Invoice included. A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.