Working Group I The Physical Science Basis

Working Group I assesses the physical science of climate change.

The IPCC Working Group I (WGI) examines the physical science underpinning past, present, and future climate change.

Scientists all over the world regularly assess the rich body of scientific literature, contributing to an ever-strengthening understanding of how the climate system works, and how it is changing in response to human activity.

The scientific topics assessed by WGI include: greenhouse gases and aerosols in the atmosphere; temperature changes in the air, land and ocean; the hydrological cycle and changing precipitation (rain and snow) patterns; extreme weather; glaciers and ice sheets; oceans and sea level; biogeochemistry and the carbon cycle; and climate sensitivity. The WGI assessment combines observations, palaeoclimate, process studies, theory and modelling into a complete picture of the climate system and how it is changing, including the attribution (or causes) of change.

The WGI assessment provides scientific information relevant for the global community to meet the challenge of climate change. As well as the global scale, WGI looks at variability and changes happening at a regional level, which is closely tied to how impacts and risks to human and natural systems are changing over time. This is, in turn, relates to the assessment of WGII and the need to design effective climate change adaptation policies. Other important policy dimensions of WGI are the assessment of the amount of carbon emissions compatible with climate and energy targets; interactions between land and the climate; and links between climate and air quality. All of these aspects are closely connected with the assessment of WGIII and strategies to mitigate against the impacts of climate change.

Reports

These are published materials composed of the full scientific and technical assessment of climate change, generally in three volumes, one for each of the Working Groups of the IPCC, plus a Synthesis Report. Each of the Working Group volumes is composed of individual chapters, an optional Technical Summary and a Summary for Policymakers.

 
Special Report

Climate Change and Land

August 2019
Special Report

Global Warming of 1.5°C

October 2018
Working Group Report

AR5 Climate Change 2013: The Physical Science Basis

September 2013
Working Group Report

TAR Climate Change 2001: The Scientific Basis

January 2001
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Resources

Resources related to the preparation of the Working Group I Report

Document
Date
File size
AR6 WGI FOD Guidance Note
April 29, 2019
117 KB
IPCC Visual Style Guide
April 17, 2019
3.9 MB
Climate Outreach IPCC Communications Handbook
November 13, 2019
2.9 MB
Role of Authors
November 13, 2019
914 KB
Role of Review Editors
November 13, 2019
90 KB
Code of Conduct
November 13, 2019
394 KB
Guidance note on Confidentiality during the preparation of IPCC reports
November 13, 2019
76 KB
Guidance note on communication and interacting with the media as an IPCC author
November 13, 2019
386 KB
Guidance note for Lead Authors of the IPCC Fifth Assessment Report on Consistent Treatment of Uncertainties
November 13, 2019
3.3 MB
Annex A to Guidance note for Lead Authors of the IPCC Fifth Assessment Report on Consistent Treatment of Uncertainties
November 13, 2019
214 KB
Expert Meeting on Regional Assessment - Meeting Report
November 13, 2019
1.4 MB
Expert Meeting on Short-lived Climate Forcers (SLCF) - Meeting Report
November 13, 2019
4.7 MB

Activities

One of the main IPCC activities is the preparation of comprehensive Assessment Reports about the state of scientific, technical and socio-economic knowledge on climate change, its causes, potential impacts and response strategies. The IPCC also produces Special Reports, which are an assessment on a specific issue, and Methodology Reports, which provide practical guidelines for the preparation of greenhouse gas inventories.

 
Event

IPCC at AGU 2021

December 13, 2021
UNFCCC

IPCC at COP 26

The IPCC will be taking part in the UN Climate Change Conference (COP26) in Glasgow from 31 October to 12 …

October 31, 2021
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News

 
Media Advisory

The IPCC at COP26 in Glasgow

GENEVA, Oct 26 – The Intergovernmental Panel on Climate Change (IPCC) will be taking part in the 26th Conference of …

October 2021
Vacancies

Information Technology Officer in the Technical Support Unit (IPCC WGI)

Working Group I of the Intergovernmental Panel on Climate Change is filling the position of Information Technology Officer in the …

September 2021
Post

IPCC advances work on final product of upcoming assessment report

GENEVA, Aug 16 – The Intergovernmental Panel on Climate Change (IPCC) opened a week-long virtual meeting of experts on Monday …

August 2021
Media Advisory

Press Conference for the Working Group I contribution to Sixth Assessment Report

GENEVA, Aug 5 – The Intergovernmental Panel on Climate Change (IPCC) will hold a press conference to present the Summary …

August 2021
Press Release

IPCC opens meeting to approve physical science report

GENEVA, July 26 – The Intergovernmental Panel on Climate Change (IPCC) opened a meeting on Monday to approve its next …

July 2021
Statement

IPCC Chair’s Statement at the opening of the 54th Session of the IPCC and 14th Session of Working Group I

CHECK AGAINST DELIVERY (Approval session for the Working Group I contribution to the Sixth Assessment Report) Statement to the Opening …

July 2021
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Co-Chairs

 

Valérie Masson-Delmotte

Co-Chair, Working Group I
France

Panmao Zhai

Co-Chair, Working Group I
China
 

Vice Chairs

 

Noureddine Yassaa

Vice-Chair
Algeria

Carolina Vera

Vice-Chair
Argentina

Muhammad Tariq

Vice-Chair, Working Group I
Pakistan

Jan Fuglestvedt

Vice-Chair, Working Group I
Norway

Gregory Flato

Vice-Chair, Working Group I
Canada

Fatima Driouech

Vice-Chair, Working Group I
Morocco

Edvin Aldrian

Vice-Chair, Working Group I
Indonesia
 

TSU Staff

 

Anna Pirani

Head of TSU
France

Clotilde Péan

Head of Operations
France

Sarah Connors

Head of Science Team
France

Yang Chen

Senior Science Officer
China

Robin Matthews

Senior Science Officer
France

Melissa Gomis

Senior Science Officer
France

Sophie Berger

Science Officer
France

Rong Yu

Science Officer
China

Baiquan Zhou

Science Officer
China

Nada Caud

Outreach Manager
France

Katherine Leitzell

Communications Manager
France

Tom Maycock

Science Editor

Mengtian Huang

Science Officer
China

Elisabeth Lonnoy

Project Assistant
France

Love Tsiane Koundjia

Team Assistant
France

Diego Cammarano

IT Officer
France
 

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