Working Group I The Physical Science Basis

WG 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

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
Working Group Report

AR2: The Science of Climate Change

February 1995
Working Group Report

AR1: Scientific Assessment of Climate Change

June 1990

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

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.

 
Lead Author Meetings

Third Lead Author Meeting of the IPCC Working Group I Sixth Assessment Report

From 26 to 30 August 2019, IPCC Working Group I will organise the Third Lead Author Meeting (LAM3) of the …

August 26, 2019
Lead Author Meetings

Second Lead Author Meeting of the IPCC Working Group I Sixth Assessment Report

From 7 to 11 January 2019, IPCC Working Group I will organise the Second Lead Author Meeting of the Sixth …

January 7, 2019
Lead Author Meetings

First Lead Author Meeting of the IPCC Working Group I Sixth Assessment Report

First Lead Author Meeting of the IPCC Working Group I Sixth Assessment Report Guangzhou, China, from 25 to 29 June 2018. …

June 25, 2018
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News

 
Media Advisory

Media registration for IPCC Special Report on Ocean and Cryosphere

GENEVA, Aug 14 – The Intergovernmental Panel on Climate Change (IPCC) will consider the Special Report on the Ocean and …

August 2019
Press Release

Land is a Critical Resource, IPCC report says

GENEVA, Aug 8 – Land is already under growing human pressure and climate change is adding to these pressures. At …

August 2019
Media Advisory

Livestream of IPCC Press conference

GENEVA, Aug 7 – The Intergovernmental Panel on Climate Change (IPCC) will be holding a press conference at 10.00 am …

August 2019
Press Release

IPCC opens meeting to consider Special Report on Climate Change and Land

GENEVA, Aug 2 – The Intergovernmental Panel on Climate Change (IPCC) opened a meeting on Friday in Geneva, Switzerland, to …

August 2019
Media Advisory

Arrangements for broadcasters for interviews on IPCC Special Report Climate Change and Land

GENEVA, July 30 – Following the press conference at 10.00 a.m. Geneva time on Thursday 8 August 2019 in Geneva, …

July 2019
Media Advisory

Interviews with authors of IPCC Special Report on Climate Change and Land

GENEVA, July 29 – Following the press conference at 10.00 a.m. local time on Thursday, 8 August 2019, in Geneva, …

July 2019
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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

Yang Chen

Senior Science Officer
China

Robin Matthews

Senior Science Officer
France

Sarah Connors

Senior Science Officer
France

Xiao Zhou

Science Assistant
China

Elisabeth Lonnoy

Project Assistant
France

Tim Waterfield

IT Officer
France

Melissa Gomis

Graphics and Communication Officer
France

Rong Yu

Science Officer
China

Baiquan Zhou

Science Officer
China

Leah Goldfarb

Senior Science Officer
France

Mengtian Huang

Science Assistant
China

Rodrigo García Manzanas

Science Officer
France
 

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