Bioclimate.org: Changes in Atmospheric Constituents and in Radiative Forcing. In: AR4 WG1. Chapter 2

Authors	Forster P. , Ramaswamy V. , Artaxo P. , Berntsen T. , Betts R.A. , Fahey D.W. , Haywood J. , Lean J. , Lowe D.C. , Myhre G. , Nganga J. , Prinn R. , Raga G. , Schulz M. , Dorland R.V.
Source	Intergovernmental Panel on Climate Change (IPCC) (45)
Type	C - Chapter (105)
Peer Review	1 - High (2301)
Audience	S - Specialist (3514)
Pages	129-234
Notes	IPCC fourth assessment report: Climate Change 2007. Working Group I Report “The Physical Science Basis” Introduction: This chapter updates information taken from Chapters 3 to 6 of the IPCC Working Group I Third Assessment Report (TAR; IPCC, 2001). It concerns itself with trends in forcing agents and their precursors since 1750, and estimates their contribution to the radiative forcing (RF) of the climate system. Discussion of the understanding of atmospheric composition changes is limited to explaining the trends in forcing agents and their precursors. Areas where signifi cant developments have occurred since the TAR are highlighted. The chapter draws on various assessments since the TAR, in particular the 2002 World Meteorological Organization (WMO)-United Nations Environment Programme (UNEP) Scientifi c Assessment of Ozone Depletion (WMO, 2003) and the IPCC-Technology and Economic Assessment Panel (TEAP) special report on Safeguarding the Ozone Layer and the Global Climate System (IPCC/TEAP, 2005).