Memorandum submitted by the Institute of Physics (CRU 39)
The disclosure of climate
data from the Climatic Research Unit at the
The Institute is pleased to submit its views to inform the House
of Commons Science and Technology Committee's inquiry, 'The disclosure of
climate data from the Climatic Research Unit at the
The submission details our response to the questions listed in the call for evidence, which was prepared with input from the Institute's Science Board, and its Energy Sub-group.
What are the implications of the disclosures for the integrity of scientific research?
1. The Institute is concerned that, unless the disclosed e-mails are proved to be forgeries or adaptations, worrying implications arise for the integrity of scientific research in this field and for the credibility of the scientific method as practised in this context.
2. The CRU e-mails as published on the internet provide prima facie evidence of determined and co-ordinated refusals to comply with honourable
scientific traditions and freedom of information law. The principle that
scientists should be willing to expose their ideas and results to independent
testing and replication by others, which requires the open exchange of data,
procedures and materials, is vital. The lack of compliance has been confirmed
by the findings of the Information Commissioner. This extends well beyond the
CRU itself - most of the e-mails were exchanged with researchers in a number of
other international institutions who are also involved in the formulation of
3. It is important to recognise that there are two completely different categories of data set that are involved in the CRU e-mail exchanges:
· those compiled from direct instrumental measurements of land and ocean surface temperatures such as the CRU, GISS and NOAA data sets; and
· historic temperature reconstructions from measurements of 'proxies', for example, tree-rings.
4. The second category relating to proxy reconstructions are the basis for the conclusion that 20th century warming is unprecedented. Published reconstructions may represent only a part of the raw data available and may be sensitive to the choices made and the statistical techniques used. Different choices, omissions or statistical processes may lead to different conclusions. This possibility was evidently the reason behind some of the (rejected) requests for further information.
The e-mails reveal doubts as to the reliability of some of the reconstructions
and raise questions as to the way in which they have been represented; for
example, the apparent suppression, in graphics widely used by the
6. There is also reason for concern at the intolerance to challenge displayed in the
e-mails. This impedes the process of scientific 'self correction', which is vital to the integrity of the scientific process as a whole, and not just to the research itself. In that context, those CRU e-mails relating to the peer-review process suggest a need for a review of its adequacy and objectivity as practised in this field and its potential vulnerability to bias or manipulation.
7. Fundamentally, we consider it should be inappropriate for the verification of the integrity of the scientific process to depend on appeals to Freedom of Information legislation. Nevertheless, the right to such appeals has been shown to be necessary. The e-mails illustrate the possibility of networks of like-minded researchers effectively excluding newcomers. Requiring data to be electronically accessible to all, at the time of publication, would remove this possibility.
8. As a step towards restoring confidence in the scientific process and to provide greater transparency in future, the editorial boards of scientific journals should work towards setting down requirements for open electronic data archiving by authors, to coincide with publication. Expert input (from journal boards) would be needed to determine the category of data that would be archived. Much 'raw' data requires calibration and processing through interpretive codes at various levels.
9. Where the nature of the study precludes direct replication by experiment, as in the case of time-dependent field measurements, it is important that the requirements include access to all the original raw data and its provenance, together with the criteria used for, and effects of, any subsequent selections, omissions or adjustments. The details of any statistical procedures, necessary for the independent testing and replication, should also be included. In parallel, consideration should be given to the requirements for minimum disclosure in relation to computer modelling.
Are the terms of reference and scope of
the Independent Review announced on
The scope of the UEA review is, not inappropriately, restricted to the
allegations of scientific malpractice and evasion of the Freedom of Information
Act at the CRU. However, most of the e-mails were exchanged with researchers in
a number of other leading institutions involved in the formulation of the
11. The first of the review's terms of reference is limited to: "...manipulation or suppression of data which is at odds with acceptable scientific practice..." The term 'acceptable' is not defined and might better be replaced with 'objective'.
12. The second of the review's terms of reference should extend beyond reviewing the CRU's policies and practices to whether these have been breached by individuals, particularly in respect of other kinds of departure from objective scientific practice, for example, manipulation of the publication and peer review system or allowing pre-formed conclusions to override scientific objectivity.
How independent are the other two international data sets?
13. Published data sets are compiled from a range of sources and are subject to processing and adjustments of various kinds. Differences in judgements and methodologies used in such processing may result in different final data sets even if they are based on the same raw data. Apart from any communality of sources, account must be taken of differences in processing between the published data sets and any data sets on which they draw.
The Institute of Physics