2025-01-15 Sherilyn Wells through 2025-01-06 Donna T.

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12 like to provide an"external but insider" assessment and perspective. My perspective is as a climate researcher that is not involved directly in any of the controversies and issues in the purloined HADCRU emails, but as one that is familiar with this research, the surrounding controversies, and many of the individuals who sent these emails. While the blogosphere has identified many emails that allegedly indicate malfeasance, clarifications especially from Gavin Schmidt have been very helpful in providing explanations and the appropriate context for these emails. However, even if the hacked emails from HADCRU end up to be much ado about nothing in the context of any actual misfeasance that impacts the climate data records, the damage to the public credibility of climate research is likely to be significant. In my opinion,there are two broader issues raised by these emails that are impeding the public credibility of climate research: lack of transparency in climate data, and "tribalism"in some segments of the climate research community that is impeding peer review and the assessment process. 1. Transparency. Climate data needs to be publicly available and well documented. This includes metadata that explains how the data were treated and manipulated, what assumptions were made in assembling the data sets, and what data was omitted and why. This would seem to be an obvious and simple requirement, but the need for such transparency has only been voiced recently as the policy relevance of climate data has increased. The HADCRU surface climate dataset and the paleoclimate dataset that has gone into the various "hockeystick" analyses stand out as lacking such transparency. Much of the paleoclimate data and metadata has become available only because of continued public pressure from Steve McIntyre. Datasets that were processed and developed decades ago and that are now regarded as essential elements of the climate data record often contain elements whose raw data or metadata were not preserved (this appears to be the case with HADCRUT). The HADCRU surface climate dataset needs public documentation that details the time period and location of individual station measurements used in the data set, statistical adjustments to the data, how the data were analyzed to produce the climatology, and what measurements were omitted and why. If these data and metadata are unavailable, I would argue that the data set needs to be reprocessed(presumably the original raw data is available from the original sources). Climate data sets should be regularly reprocessed as new data becomes available and analysis methods improve. There are a number of aspects of the surface climate record that need to be understood better. For example, the surface temperature bump ca. 1940 needs to be sorted out, and I am personally lacking confidence in how this period is being treated in the HADCRUT analysis. In summary, given the growing policy relevance of climate data, increasingly higher standards must be applied to the transparency and availability of climate data and metadata. These standards should be clarified, applied and enforced by the relevant national funding agencies and professional societies that publish scientific journals. 2. Climate tribalism. Tribalism is defined here as a strong identity that separates one's group from members of another group, characterized by strong in-group loyalty and regarding other groups differing from the tribe's defining characteristics as inferior. In the context of scientific research, tribes differ from groups of colleagues that collaborate and otherwise associate with each other professionally. As a result of the politicization of climate science, climate tribes (consisting of a small number of climate researchers)were