Currently Skimming:
4 Review of Individual Chapters
4 Review of Individual Chapters
Pages 10-21
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
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From page 10... ...
3.2. In some cases, these specific comments relate to the overarching comments provided in the previous two chapters of this review.
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From page 11... ...
This need not be a detailed performance evaluation; it would be adequate simply to state that intercomparison studies have shown that the performance of these models is comparable to other state of the art climate models. Finally, the methodology and its limitations should be made clearer at the outset and should also explain why new emissions scenarios are needed.
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From page 12... ...
The committee speculated that the intent was to show the similarities in surface temperature change and ozone change between the global and regional models, but was left wondering if there was more to the section. The committee agrees that more research is clearly needed to assess if downscaled RCM simulations improve our ability to characterize climate change (lines 1132-1145)
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From page 13... ...
L34786:Some discussion of the methodology employed to link MERGE output to MAGICC, particularly in the carbon cycle is needed. The MERGE model appears to have adjusted its ocean to reproduce essentially the same behavior as the other two models' combined ocean and terrestrial system models.
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From page 14... ...
However, the climate models do not use consistent forcing scenarios for the short-lived species, nor do they use consistent natural emissions of primary aerosols and ozone and aerosol precursors or consistent removal mechanisms for the short-lived species. This makes comparison of the model results challenging.
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From page 15... ...
At this point, there is sufficient information from present study and previous ones to get an approximate idea of what the feedbacks and control sensitivities are on the system to get a first order estimate of what controls on short-lived species and their precursors might do to climate. While the committee notes that the present document would benefit from these additional analyses, it may not be feasible given time and potential monetary constraints; in such a case, a recommendation for future analyses should be included in Chapter 4.
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From page 16... ...
The methane section could end with a brief description of other chemistry-climate feedbacks that could play a major role in the future climate. Processes involved in the feedbacks include: lightning NOx emissions, land cover change, changes in convection and transport, and changes in absolute humidity.
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From page 17... ...
Also in Table 3.3, the GFDL ozone production efficiency declines dramatically between 2000 and 2030 (7.19 to 2.24)
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From page 18... ...
This paragraph assumes that reducing surface transportation emissions of short-lived species and their precursors is done by reduced fuel consumption. This is not necessarily the case.
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From page 19... ...
1. The SAP model scenarios for long-lived species produce projections that are within the IPCC range, although it should be noted that the SAP response range tends to be lower than all but the IPCC "commitment scenario".
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From page 20... ...
In addition, there is a need for modeling studies with finer resolution models, both at regional and global scales, to determine the resulting impacts on derived effects from short-lived emissions This SAP examines only a subset of processes controlling short-lived species and their interactions with clouds. Other processes might be important but have not been addressed such as ice clouds and their interactions with short lived species and the climate system There is evidence that future biomass burning and land cover change could have a large effect on the climate response.
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From page 21... ...
From what is presented, reducing NOx will reduce tropospheric ozone. Reducing tropospheric ozone should reduce radiative forcing.
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