Government Comments on the Final Draft of the SPM IPCC Working ...

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<strong>Government</strong> <strong>Comments</strong> on the Final Draft of the SPM IPCC Working Group I Fourth Assessment Report Batch Page:line No. From To Comment SPM-458 A 7:27 7:27 It is difficult to interpret the meaning of this sentence. We propose the following wording: Paleoclimate information supports the notion that the recent warming is unusual also in a longer time perspective, i.e. a few thousand years. Paleoclimate information also suggests that……etc. [Govt. of Sweden (Reviewer’s comment ID #: 2019-17)] SPM-459 A 7:27 7:27 Suggest changing to “…suggests that past warming has also driven large-scale…” [Govt. of United States of America (Reviewer’s comment ID #: 2023-53)] SPM-460 A 7:27 7:28 This sentence is really two points that are totally independent as articulated in the two paragraphs that follow, and has to be read very carefully to properly interpret the message. The danger for policymakers is that one can easily assume that “unusual nature of the recent warming” and “past warming” are the same warming, whereas the paragraphs that follow indicate that one is past recent warming during the second half of the 20th century and the other past warming was 125,000 years ago. At the very least, break the statement into two sentences, as edited and as follows: “Paleoclimate information supports the unusual nature of the recent warming. Paleoclimate evidence suggests that more distant past warming (glacier-free periods of the last 500,000 years) has driven large-scale ice sheet retreat and sea level rise.” [Govt. of United States of America (Reviewer’s comment ID #: 2023-54)] SPM-461 A 7:27 8:2 The key finding for this section is that it is very likely that 20th century temperatures were the hottest in the Northern Hemisphere in the past 500 years. This should be more prominent. Suggest that the last sentence of the first dot point in this section, is moved to become the second sentence of the bolded section header. [Govt. of Australia (Reviewer’s comment ID #: 2002-75)] SPM-462 A 7:27 8:2 The TAR had a figure showing a millennium-scale temperature reconstruction (the so-called "hockeystick curve") that sparked an unusually heated controversial discussion, including by policymakers. The present text should therefore be complemented by an updated version of this figure from the Technical summary. [Govt. of European Community (Reviewer’s comment ID #: 2008-9)] SPM-463 A 7:30 7:30 Insert "over the past 1000 years" between "temperatures" and "than" to make it clear what the recent studies have found. [Govt. of Australia (Reviewer’s comment ID #: 2002-76)] SPM-464 A 7:30 7:33 Awkward and long sentence and one that does not follow directly from the bolded sentence above and the message gets lost. Suggest restructuring the paragraph. The phrasing is better in Technical Summary (page TS-30 lines 31-33). Also, suggest adding to end of line 31 the phrase from the Technical Summary (TS-31 lines 14-15) “these are likely linked to natural forcings due to volcanic eruptions and/or solar activity.” [Govt. of Canada (Reviewer’s comment ID #: 2004-33)] SPM-465 A 7:30 7:30 Insert ’multidecadal’ between greater and variability. [Govt. of Netherlands (Reviewer’s comment ID #: 2014-17)] SPM-466 A 7:30 7:31 Suggest replacing the first sentence of the bullet with “Some studies since the TAR have indicated greater cooling during the so-called Little Ice Age, particularly during the 12 to 14th, 17th, and 19th centuries.” [Govt. of United States of America (Reviewer’s comment ID #: 2023-55)] SPM-467 A 7:30 8:2 It would be extremely useful to provide a figure in support of this bullet point, such as the top panel of Figure TS-20. It would deal with the contentious part of the "hockey stick curve" and is something most policy makers will expect to be clearly Page 50 of 99
<strong>Government</strong> <strong>Comments</strong> on the Final Draft of the SPM IPCC Working Group I Fourth Assessment Report Batch Page:line No. From To Comment addressed in the SPM. [Govt. of Canada (Reviewer’s comment ID #: 2004-34)] SPM-468 A 7:31 7:31 For the sentence to make grammatical sense suggest inserting "finding that cooler periods existed" after "particularly". [Govt. of Australia (Reviewer’s comment ID #: 2002-77)] SPM-469 A 7:32 7:32 The second sentence ("Warmer periods….the TAR") is too obtuse for policy readers. For example: What is the uncertainty range?; and Why is the connection made to the TAR? [Govt. of Australia (Reviewer’s comment ID #: 2002-78)] SPM-470 A 7:32 7:32 It should be noted that only one study found that slightly warmer conditions may have existed in the 11th century than was indicated in the TAR. [Govt. of Australia (Reviewer’s comment ID #: 2002-79)] SPM-471 A 7:32 7:33 " Average Northern.." replace with "In the FAR average Northern.." . The goal is to clarify which results are new. [Govt. of Italy (Reviewer’s comment ID #: 2012-12)] SPM-472 A 7:32 7:33 "Average Northern Hemisphere temperatures….": are these surface temperatures? [Govt. of Italy (Reviewer’s comment ID #: 2012-37)] SPM-473 A 7:32 7:32 Clarification: Warmer periods before the 20th century are within the uncertainty range given in the TAR. [Govt. of Sweden (Reviewer’s comment ID #: 2019-18)] SPM-474 A 7:32 please insert here the top part of figure TS-20, representing the NH temperature reconstructions, which shows very clearly the evolution of temperatures in the last 1300 years, and the uncertainties associated to these estimations. [Govt. of France (Reviewer’s comment ID #: 2010-27)] SPM-475 A 7:33 7:33 Replace "very likely warmer" by "very likely higher" (a temperature can not be warm) [Govt. of Netherlands (Reviewer’s comment ID #: 2014-18)] SPM-476 A 7:33 8:1 "...temperatures during the second half of the 20th century were very likely warmer than during any other 50-year period in the last 500 years and likely the warmest in at least the past 1300 years." What is the difference between 500 and 1300 years, e.g., the confidence level of " very likely " and "likely" ? It should be mentioned that the 500 years include LIA and the 1300 years include MWP. [Govt. of China (Reviewer’s comment ID #: 2006-28)] SPM-477 A 8:1 8:1 Replace "warmest"by "highest". [Govt. of Netherlands (Reviewer’s comment ID #: 2014-20)] SPM-478 A 8:4 8:9 A sea level rise between 4 and 6 m linked with a polar temperature rise between 3 and 5 °C looks inconsistent with i) the forecast 0,19m to 0,58m sea level rise by 2100, which is associated with a +1 to +6,3 °C temperature rise (see page 11, lines 11 to 26) and ii) the indication that "warming is expected to be greatest (...) at high northern latitudes" (see page 11, lines 48 and 49).This apparent discrepancy needs to be explained? [Govt. of Belgium (Reviewer’s comment ID #: 2003-34)] SPM-479 A 8:4 8:9 We would also like to know the global temperature estimate for this interglacial period. [Govt. of Norway (Reviewer’s comment ID #: 2016-20)] SPM-480 A 8:5 8:5 Insert "the" between "to" and "retreat", as it was not the retreat that cause the sea level rise per se but rather the effect of the Page 51 of 99
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