SODBatch A&B SPM Comments co-chair response final ... - ipcc-wg3

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Comments
IPCC WGIII Fourth Assessment Report, Second Order Draft
A 6 1 0 0
consistent.
(Lenny Bernstein, L. S. Bernstein & Associates, L.L.C.)
Table SPM.1: This table contains a lot of information, some of
which is critical to policymakers, some of which is more of a
technical supporting nature. On balance, I feel this table is
overloaded with information that distracts from the main message. I
would suggest replacing this table with Table TS.6, which contains
all the key information and uses both graphical and text elements
and is much more accessible to non-experts.
(Andy Reisinger, TSU IPCC Synthesis Report)
A 6 1 0 0 Table SPM.1, footnote 4: Please consult with WG1 about the
consistent treatment of uncertainty in deriving the specific
information in this table, and ensure that this trickles down to the
TS and chapter level. I'm not sure the translation of "likely" into an
80% log-normal confidence interval is necessarily the best way.
Please contact experts from WG1 to ensure consistency across
IPCC WG reports.
(Andy Reisinger, TSU IPCC Synthesis Report)
A 6 1 0 0 Table SPM 1: stabilisation level CO2, quoted 350-420 ppm in first
row for category A, compare TS page 25: "attainability of very low
targets of 350 ppmv CO2 and below (category A)", TS suggest
concentration levels below 350 can be needed, SPM gives from 350
onwards, contradiction. This results also in unrealistic targets for
non CO2 GHGs (range 375-510), e.g. leaving 375-350=25 CO2eq
for the non CO2 GHGs)
(Hans Eerens, MNP)
A 6 1 6 1 Table SPM1 is a very valuable and powerful tool. It would be very
good to add the year at which the equilibrium temperature is
reached and express the probability of staying below a given
temperature by indicating the associated probability in numbers.
Furthermore references to emissions peaking in 2000 seem
irrelevant (as it is already 2006) and should be updated. It would
also be helpful to include or comment on the probability of
exceeding 2/3ºC at any time, not just at equilibrium. A sustained
Expert Review of Second-Order-Draft
Confidential, Do Not Cite or Quote
Response suggested by cochairs
Action
for
chapter
Considerations
by the writing
team
DISCUSS, see also a-418 Suggested to
keep table SPM
1
DISCUSS; FULL
CONSISTENCY NEEDED
ACC; ranges to accurately
reflect what studies are
available; TS and chapter to be
consistent with SPM
TIA; consider info on
equilibrium timeframe
REJ addition of %/yr
information (much too detailed)
REJ adding probability at any
time (too detailed and for most
studies not relevant)
3,1 Noted. See
comment SPM-
421.
(3)
3 Noted. See
comment SPM-
421.
(3)
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