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Intergovernmental Panel on Climate Change Papers; IPCC Fourth Assessment Report Papers: Working Group I, The Physical Science Basis of Climate Change, 2005-2007; Expert Review Comments on First-Order Draft, Chapter 9. ESPP IPCCAR4WG1. Environmental Science and Public Policy Archives. Harvard College Library, Cambridge, Mass. page 24. 24

The climate system simply hasn't had time to respond to the accumulated GHG radiative forcing. [Andrew Lacis] 9-126 A 3:49 3:51 This sentence seems to duplicate lines 10-12. First paragraph is an overall summary [Michael MacCracken] of the ES, so some repetition is inevitable. 9-127 A 3:50 Replace “is likely to “ with “could possibly” Rejected.

 

Intergovernmental Panel on Climate Change Papers; IPCC Fourth Assessment Report Papers: Working Group I, The Physical Science Basis of Climate Change, 2005-2007; Expert Review Comments on First-Order Draft, Chapter 9. ESPP IPCCAR4WG1. Environmental Science and Public Policy Archives. Harvard College Library, Cambridge, Mass. page 61. 61

Would an identical Pinatubo eruption actually produce and identical regional climate response? [Andrew Lacis] 9-440 A 17:56 17:56 "to within approximately 40%": 40% is a lot! Can we still consider that the response is Some particular efficacies are this Confidential, Do Not Cite or Quote Chapter 9: Batch AB (11/16/05) Page 61 of 186

 

Intergovernmental Panel on Climate Change Papers; IPCC Fourth Assessment Report Papers: Working Group I, The Physical Science Basis of Climate Change, 2005-2007; Expert Review Comments on First-Order Draft, Chapter 9. ESPP IPCCAR4WG1. Environmental Science and Public Policy Archives. Harvard College Library, Cambridge, Mass. page 71. 71

documented GHG increases, and the radiative consequences of these GHG changes (together with some inferred aerosol changes) fully account for the observed trends of global temperature increase. [Andrew Lacis] 9-518 A 22:27 22:50 Once again, the subject matter would seem to come under the purview of chapter 6, where Taken into account, but minimum a more detailed discussion is already provided.

 

Intergovernmental Panel on Climate Change Papers; IPCC Fourth Assessment Report Papers: Working Group I, The Physical Science Basis of Climate Change, 2005-2007; Expert Review Comments on First-Order Draft, Chapter 9. ESPP IPCCAR4WG1. Environmental Science and Public Policy Archives. Harvard College Library, Cambridge, Mass. page 149. 149

Regarding part one (the direct contribution), there should be little uncertainty - this part is only a question of radiation model accuracy. The time scale to actually reach equilibrium is a totally separate kind of concern. [Andrew Lacis] 9-1139 A 54:24 54:24 Maunder Minimum is a term to describe a period of low numbers of sunspots or low solar Accepted.

 

Intergovernmental Panel on Climate Change Papers; IPCC Fourth Assessment Report Papers: Working Group I, The Physical Science Basis of Climate Change, 2005-2007; Expert Review Comments on First-Order Draft, Chapter 9. ESPP IPCCAR4WG1. Environmental Science and Public Policy Archives. Harvard College Library, Cambridge, Mass. page 147. 147

Establishing how clouds respond to temperature change addresses the principal uncertainty affecting climate sensitivity. [Andrew Lacis] 9-1130 A 53:57 54:2 several studies have used observed surface temperature changes over the last 150 years Text has been edited.

 

Intergovernmental Panel on Climate Change Papers; IPCC Fourth Assessment Report Papers: Working Group I, The Physical Science Basis of Climate Change, 2005-2007; Expert Review Comments on First-Order Draft, Chapter 9. ESPP IPCCAR4WG1. Environmental Science and Public Policy Archives. Harvard College Library, Cambridge, Mass. page 156. 156

Furthermore, even if ERBE could measure this flux change, it would be a measurement related to ocean heat capacity and the rate of heat transport into the ocean, not climate sensitivity. [Andrew Lacis] 9-1177 A 56:36 56:36 Possibly worth reminding the reader what sort of increases are thought plausible for the Reader has been referred to ch 10.

 

Intergovernmental Panel on Climate Change Papers; IPCC Fourth Assessment Report Papers: Working Group I, The Physical Science Basis of Climate Change, 2005-2007; Expert Review Comments on First-Order Draft, Chapter 9. ESPP IPCCAR4WG1. Environmental Science and Public Policy Archives. Harvard College Library, Cambridge, Mass. page 43. 43

[William Ingram] 9-295 A 9:43 9:43 Is there any rationale as to which words get capitalized and which worrds are not This is an editorial detail for capitalized in subsection headings? consideration by the TSU. [Andrew Lacis] Confidential, Do Not Cite or Quote Chapter 9: Batch AB (11/16/05) Page 43 of 186

 

Intergovernmental Panel on Climate Change Papers; IPCC Fourth Assessment Report Papers: Working Group I, The Physical Science Basis of Climate Change, 2005-2007; Expert Review Comments on First-Order Draft, Chapter 9. ESPP IPCCAR4WG1. Environmental Science and Public Policy Archives. Harvard College Library, Cambridge, Mass. page 76. 76

[Vincent Gray] 9-561 A 24:50 41:25 It would be better to incorporate some of this discussion in Chapter 3. Rejected since it is appropriate to start [Andrew Lacis] off each subsection of 9.4 with a short summary of observational evidence 9-562 A 24:56 Insert after “planet” “since 1980” Rejected.