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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 55. 55

Note for example that the Agung and El Chichon eruptions were hemispherically quite different. [Andrew Lacis] 9-387 A 15:24 On "Spatial and Temporal Patterns of the Response to Different Forcings and their This is what the detection and Uncertainties."?

 

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 168. 168

Hurricanes have warm ocean water as their basic source of energy. So, warmer ocean water and stronger hurricanes are again a likely expectation. [Andrew Lacis] 9-1280 A 62:3 64:33 These questions should be part of the Key Findings at the beginning of the text, not I don’t think they will be buried in the burried in back of the report. final assessment.

 

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 117. 117

[Sandrine Bony] 9-922 A 43:34 51:16 This discussion would be more at home in Chapter 3. Reject. We include references to [Andrew Lacis] chapter 3 for observed changes, but discuss mechanisms and the consistency of simulated and observed changes.

 

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 144. 144

(1984) express their radiative forcing for doubled CO2 (and 2% solar irradiance increase) in terms of Delta-T-zero, which is the equivalent of adjusted forcing, but expressed in terms of a global surface temperature change with no feedbacks allowed to operate. [Andrew Lacis] 9-1116 A 53:37 61:3 The whole section 9.6 is very well written and well organized. Noted, thanks [Sandrine Bony] 9-1117 A 53:37 Section 9.6: Chapters 8, 9 and 10 all contain information on Climate Sensitivity.

 

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 148. 148

Batch From To Comment Notes [Hermann Held] 9-1132 A 54:3 54:4 The conclusions of studies that have used radiosonde data should be qualified by the The effect of this uncertainty has been findings of inaccurate trends. qualified (is small since study in [Kevin Trenberth] question uses also surface T). 9-1133 A 54:5 54:6 It is wishful thinking to believe that climate sensitivity can actually be observed. Rejected, this is not said in the text. [Andrew Lacis] 9-1134 A 54:9 54:11 Please characterize this one “further variant” in a couple of words; the fact that “uncertain 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 113. 113

discussion of stratospheric trends seems [Kevin Trenberth] outside the scope of a brief summary. 9-880 A 41:18 43:32 It would be better to move this discussion to Chapter 5. Rejected. Quantitative comparison [Andrew Lacis] between modelled and observed estimates of oceanic climate change are made here. 9-881 A 41:18 Section 9.5: there are many overlaps between this section and chapters 3 - 5 Noted.

 

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 146. 146

[William Ingram] 9-1127 A 53:53 53:53 For estimating global climate change, this is actually a more robust quantity than adjusted Noted. The importance of feedbacks for forcing. Lacis and Mishchenko (1995) show that for a globally uniform forcing, such as sensitivity uncertainty has been doubled CO2, Delta-T-zero is essentially independent of latitude while the adjusted flux clarified.

 

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 78. 78

Waste Management Assoc. 54, 1351-1359 (2004). Hansen, J., L. Nazarenko, R. Ruedy, M. Sato, J. Willis, A. Del Genio, D. Koch, A. Lacis, K. Lo, S. Menon, T. Tovakov, Ju. Perlwitz, G. Russell, G.A. Schmidt, and N. Tausnev 2005. Earth's energy imbalance: Confirmation and implications.