2013 Supplement to the 2006 IPCC Guidelines for
National Greenhouse Gas Inventories: Wetlands

Reports of Review Editors
Compilation

Note by Technical Support Unit for the IPCC Task Force on National Greenhouse Gas
Inventories (28 February 2014):
As defined in the Procedures for the Preparation, Review, Acceptance, Adoption, Approvaland Publication of IPCC Reports, the role of the Review Editors in production of an IPCC
Report is, among others, to ensure that all substantive expert and government review
comments are afforded appropriate consideration, advise lead authors on how to handle
contentious/controversial issues and ensure genuine controversies are reflected adequately
in the text of the Report.
This document is a compilation of reports submitted by the Review Editors of the 2013
Supplement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories:
Wetlands (Wetlands Supplement) in accordance with the IPCC Procedures. The signaturesof Review Editors have been removed in this document for data protection reasons.
The Review Editors’ reports are part of the quality control of the review process of the IPCC
Report. They are not intended to be additional reviews of the content of the drafts of theWetlands Supplement.

Compilation of Reports of Review Editors for the Wetlands Supplement

28 February 2014

Report by Review Editors of Overview Chapter of Wetlands
Supplement to the IPCC
We acted as Review Editors for Overview Chapter of the 2013 Supplement to the 2006 Guidelines for
National Greenhouse Gas Inventories: Wetlands (Wetlands Supplement). Overview Chapter of theWetlands Supplement received 96 comments from expert reviewers and 79 from governments that
underwent review by Governments and Experts as mandated by the IPCC principles and procedures.
Also, there were 127 other comments from expert reviewers and 47 other comments fromgovernments that are relevant to the entire Wetlands Supplement1.
We assisted in the process of handling of comments by the authors of Overview Chapter in order toensure that all substantive expert and government review comments are afforded appropriate
consideration as well as to advise Lead Authors on handling contentious/controversial issues. We aresatisfied that the Lead Authors of Overview Chapter of Wetlands Supplement have given appropriate
consideration to all the comments received in the review process to produce a balanced text thatreflects the range of views on the topics covered.
We understand that a table containing all the comments received and proposed responses by theauthors will be made available on the IPCC website by the final publication of the Report.
The following are some of the important features of the review comments on Overview Chapter:a) Most of the comments were on editorial issuesb) Almost all substantive issues were acceptedc) Those who were not accepted were in general on explanations which were covered infollowing chapters in the Wetlands Supplement
The Lead Authors addressed the abovementioned appropriately in the text of the Final Draft ofWetlands Supplement.
[signature removed][signature removed]

Erda Lin

Steen Gyldenkærne1

These review comments include those on Glossary as well as general comments on the entire Wetlands
Supplement.

Report by Review Editors of Chapter 1 of the Wetlands Supplement to theIPCC
We acted as Review Editors for Chapter 1 of the 2013 Supplement to the 2006 Guidelines forNational Greenhouse Gas Inventories: Wetlands (Wetlands Supplement). This Chapter
received 900 comments from expert reviewers and 148 comments from governments over
the two rounds of review as mandated by the IPCC principles and procedures.
We assisted in the process of handling of comments by the authors of Chapter 1 in order toensure that all substantive expert and government review comments are afforded
appropriate consideration as well as to advise Lead Authors of Chapter 1 on handling
contentious/controversial issues. We are satisfied that the Lead Authors of Chapter 1 havegiven appropriate consideration to all the comments received in the review process toproduce a balanced text that reflects the range of views on the topics covered.
We understand that a table containing all the comments received and responses by theauthors will be made available on the IPCC website by the final publication of the Report.
The following are some of the important features of the review comments on Chapter 1:a) For FOD of Chapter 1, there were about 638 comments, of which 457, 42, and 139
were accepted and/or accepted but addressed differently, noted and rejected,respectively. The major issues in Chapter 1 were related to (1) the definitions ofwetland, peatland, peat, peat soils, and wet/dry/organic/mineral soils, (2) what is oris not covered in this Wetlands Supplement in relation to the 2006 IPCC Guidelines,and (3) the ease of use of Chapter 1 to refer inventory compilers to appropriate
chapters. Task allocation among authors, discussions, and responding to reviewer
comments were realized successfully to complete FOD of Chapter 1. Reasons forrejection of some comments were mostly related to different definitions adopted,
redundancy of text additions already incorporated in other chapters, scientific issues
on which no agreements exist, and out-of-scope issues.
The high number of comments in Chapter 1 is mainly due to many spelling errors,differences in naming, lack of consistency etc. among the Chapters. A better
coordination and timing among the different chapters could have avoided much ofthis.
b) After FOD, the revised version of Chapter 1 has improved significantly. Cross-cutting
issues such as harmonization, consistency, and practicality, and an internal reorganization of titles and subtitles of Chapter 1 were addressed. The content ofChapter 1 was shortened to avoid redundancy for a better flow. Decision tree andFig. 1.3 have been improved on so as to meet needs of each chapter. A better linkbetween management activities and land use categories was provided in Chapter 1.
Section 1.7.2 aimed at provision of what is contained in each chapter of thesupplement. Confusion over how an inventory compiler would use the Wetlands
Supplement in conjunction with the 2006 IPCC Guidelines was overcome through theimprovement of decision tree in Chapter 1. All text that is not essential to “cookbook guidance” to inventory compilers on how to use this supplement for theestimation of emissions/removals from wetlands was removed.
c) Definitions and wording in the Wetlands Supplement have created many commentsand discussions during the process as there are many different definitions worldwide
of wet land and soils with raised content of organic matter. Soils which are coveredin the Wetlands Supplement. Chapter 1 will very likely in the future raise questions
on the definitions used in the Wetland Supplement. It is our impression that the LeadAuthors have made their outmost to make the definitions as clear as possible.
Having completed SOD, Chapter 1 has been refined to its final version in accordance withboth the accepted and rejected comments. All the comments have been taken into accountand addressed satisfactorily in accordance with related scientific literature. Therefore, theREs have agreed on the final version of Chapter 1 to be submitted for consideration ofpublication in the Wetlands Supplement.

[signature removed][signature removed]

Fatih Evrendilek

Steen Gyldenkærne

Report by Review Editors of Chapter 2 of the Wetlands Supplement tothe IPCC
We acted as Review Editors for Chapter 2 of the 2013 Supplement to the 2006 Guidelines for
National Greenhouse Gas Inventories: Wetlands (Wetlands Supplement). This Chapter received 2603
comments from expert reviewers and 154 comments from governments over the two rounds ofreview as mandated by the IPCC principles and procedures.
We assisted in the process of handling of comments by the authors of Chapter 2 in order to ensurethat all substantive expert and government review comments are afforded appropriate
consideration as well as to advise Lead Authors of Chapter 2 on handling contentious/controversial
issues. We are satisfied that the Lead Authors of Chapter 2 have given appropriate consideration to
all the comments received in the review process to produce a balanced text that reflects the rangeof views on the topics covered.
We understand that a table containing all the comments received and responses by the authors will
be made available on the IPCC website by the final publication of the Report.
The following are some of the important features of the review comments on Chapter 2:a) The updating from the 2006 guidelines of the estimates of CO 2 emission factors for drained
tropical organic soils generated numerous comments. The scientific literature for tropicalecosystems does not provide as complete a picture of the ecosystem carbon exchange withthe atmosphere as that found for temperate and boreal systems. These systems are highly
complex and most studies were not undertaken with the objective to estimate net C
emissions or removals. In addition, very few Eddy Covariance Flux measurements, useful toclose carbon budgets, or studies comparing methodologies were available for theseconditions. In Chapter 2, two methods were considered (flux and subsidence methods)
similarly to the approach that was used for other land-use types and other climate zones
when studies were available. Both methods are prone to a wide range of potential
methodological issues and uncertainties which are discussed in the main text and in theappendix. The authors have included as much as possible of the pertinent literature toprovide a wide temporal and geographical coverage. The methodological approach that wasused to come up with a single emission factor per land use type is described both in themain text and in the appendices. The consensus that was reached took into consideration
major sources of uncertainties. The final estimates that were produced showed wide
confidence intervals indicating that as knowledge matures, consideration of higher tier levels
when possible would reduce uncertainty and increase accuracy. Nevertheless, given thecurrent state of knowledge, the approach that was used is considered balanced and robust.
b) The report provided for the first time guidance and emission factors for CH 4 emissions fromdrainage ditches, for off-site CO 2 emissions originating from dissolved organic carbon and
for GHG emissions from peat fire, all of which generated comments mostly aimed atclarifying the methodologies used to derive these new emission factors. The author’s teamwas rigorous in taking into consideration these comments and in making the new
methodologies transparent. The new emission factors can be considered rigorous. Againsources of uncertainties are discussed in the text and provide insights for future
improvements.
In conclusion, the Lead Authors addressed the comments that were made during the review rounds
appropriately in the text of the Final Draft of Chapter 2 of the Wetlands Supplement.

[signature removed]
David Paré[signature removed]
Iman Rusmana

Bernard Siska

Report by Review Editors of Chapter 5 of the Wetlands Supplement tothe IPCC
We acted as Review Editors for Chapter 5 of the 2013 Supplement to the 2006 Guidelines forNational Greenhouse Gas Inventories: Wetlands (Wetlands Supplement). This Chapter received 528
comments from expert reviewers and 74 comments from governments over the two rounds ofreview as mandated by the IPCC principles and procedures.
We assisted in the process of handling of comments by the authors of Chapter 5 in order to ensurethat all substantive expert and government review comments are afforded appropriate
consideration as well as to advise Lead Authors of Chapter 5 on handling contentious/controversial
issues. We are satisfied that the Lead Authors of Chapter 5 have given appropriate consideration to
all the comments received in the review process to produce a balanced text that reflects the rangeof views on the topics covered.
We understand that a table containing all the comments received and responses by the authors will
be made available on the IPCC website by the final publication of the Report.
The following are some of the important features of the review comments on Chapter 5:a) discussions of definitions (such as: inland wet mineral soil);b) cross references, and the harmonization of terms and definitions used in otherchapters and glossary;c) discussion of inclusion the N 2 O emissions;d) verification and inclusion values of emission rates and carbon stocks found in theliterature and databases.

The Lead Authors addressed the above mentioned appropriately in the text of the Final Draft ofChapter 5of the Wetlands Supplement.

[signature removed][signature removed]

Michelle Garneau

Irineu Bianchini Jr.

Report by Review Editors :Chapter 6 of the Wetlands Supplement to the IPCC
We acted as Review Editors for Chapter 6 of the “2013 Supplement to the 2006 IPCC Guidelines for
National Greenhouse Gas Inventories: Wetlands" (Wetlands Supplement). The chapter received 561
comments from expert reviewers and 38 comments from governments over the two rounds ofreview as mandated by the IPCC principles and procedures.
We assisted in the process of handling of comments by the authors of Chapter 6 in order to ensurethat all substantive expert and government review comments were afforded appropriate
consideration as well as to advise Lead Authors of Chapter 6 on the handling ofcontentious/controversial issues.
We are satisfied that the Lead Authors of Chapter 6 have given appropriate consideration to all thecomments received in the review process and have produced a balanced text that reflects the rangeof views and comments on the topic covered.
We understand that a table containing all the comments received and responses by the authors will
be made available on the IPCC website by the time of the final publication of the Report.
The following are some of the important elements of the expert and government review comments
on Chapter 6:a) Remove duplication in and ensure consistency with the methodologies and general
guidelines of the 2006 IPCC document on National Greenhouse Gas Inventories: Wetlands;b) Provide the comprehensive argumentation, to the general and expert comments, based on
the most recent scientific publications;c) Update and modify the chapter with references checked in order to improve its accuracy
and completeness.
The Lead Authors have addressed the abovementioned appropriately in the text of the Final Draft ofChapter 6 of the Wetlands Supplement.

[signature removed]
Detelina Petrova[signature removed]
Chris Gordon

Report by Review Editors of Chapter 7 of the Wetlands Supplement tothe IPCC
We acted as Review Editors for Chapter 7 of the 2013 Supplement to the 2006 Guidelines forNational Greenhouse Gas Inventories: Wetlands (Wetlands Supplement). This Chapter received 382
comments from expert reviewers and 31 comments from governments over the two rounds ofreview as mandated by the IPCC principles and procedures.
We assisted in the process of handling of comments by the authors of Chapter 7 in order to ensurethat all substantive expert and government review comments are afforded appropriate
consideration as well as to advise Lead Authors of Chapter 7 on handling contentious/controversial
issues. We are satisfied that the Lead Authors of Chapter 7 have given appropriate consideration to
all the comments received in the review process to produce a balanced text that reflects the rangeof views on the topics covered.
We understand that a table containing all the comments received and responses by the authors will
be made available on the IPCC web site by the final publication of the Report.

The Lead Authors addressed the comments appropriately in the text of the Final Draft of Chapter 7of the Wetlands Supplement.

[signature removed]

Erda，Lin[signature removed]

Werner Leo Kutsch