Title What do glaciers tell us about climate variability and climate change?
Author Roe, G.H.
Author Affil Roe, G.H., University of Washington, Department of Earth and Space Sciences, Seattle, WA
Source Journal of Glaciology, 57(203), p.567- 578, . Publisher: International Glaciological Society, Cambridge, United Kingdom. ISSN: 0022-1430
Publication Date 2011
Notes In English. Includes appendix. 43 refs. GeoRef Acc. No: 310260
Index Terms climatic change; glacial geology; glaciers; global change; global warming; United States--Washington--King County; United States--Washington--Mount Baker; United States--Washington--Whatcom County; climate change; climate effects; King County Washington; Mount Baker; United States; Washington; Whatcom County Washington
Abstract Glaciers respond to long-term climate changes and also to the year-to-year fluctuations inherent in a constant climate. Differentiating between these factors is critical for the correct interpretation of past glacier fluctuations and for the correct attribution of current changes. Previous work has established that century-scale, kilometer- scale fluctuations can occur in a constant climate. This study asks two further questions of practical significance: how likely is an excursion of a given magnitude in a given amount of time, and how large a trend in length is statistically significant? A linear model permits analytical answers wherein the dependencies on glacier geometry and climate setting can be clearly understood. The expressions are validated with a flowline glacier model. The likelihood of glacier excursions is well characterized by extreme-value statistics, although probabilities are acutely sensitive to some poorly known glacier properties. Conventional statistical tests can be used for establishing the significance of an observed glacier trend. However, it is important to determine the independent information in the observations which can be effectively estimated from the glacier geometry. Finally, the retreat of glaciers around Mount Baker, Washington State, USA, is consistent with, but not independent proof of, the regional climate warming that is established from the instrumental record.
URL http://hdl.handle.net/10.3189/002214311796905640
Publication Type journal article
Record ID 65007300