Wind speed trends over the contiguous United States

• Published in: Journal of Geophysical Research - Atmospheres Vol. 114; no. D14; pp. D14105 - n/a
• Main Authors: Pryor, S. C., Barthelmie, R. J., Young, D. T., Takle, E. S., Arritt, R. W., Flory, D., Gutowski Jr, W. J., Nunes, A., Roads, J.
• Format: Journal Article
• Language: English
• Published: Washington, DC American Geophysical Union 27-07-2009; Blackwell Publishing Ltd
• Subjects: Atmosphere; Climate variability; Earth sciences; Earth, ocean, space; Exact sciences and technology; Global Change; Impacts of global change; Instruments and techniques; interannual variability; Regional climate change; temporal trends; wind speed; United States; temporal trends; wind speed; interannual variability; detection; trend-surface analysis; simulation; Regional scope; Spectral model; Wind velocity; exhibits; Climate models; global; climate; variability; North America; Interannual variation; winds; Reanalysis; boundary conditions
• ISSN: 0148-0227; 2156-2202
• DOI: 10.1029/2008JD011416

A comprehensive intercomparison of historical wind speed trends over the contiguous United States is presented based on two observational data sets, four reanalysis data sets, and output from two regional climate models (RCMs). This research thus contributes to detection, quantification, and attribution of temporal trends in wind speeds within the historical/contemporary climate and provides an evaluation of the RCMs being used to develop future wind speed scenarios. Under the assumption that changes in wind climates are partly driven by variability and evolution of the global climate system, such changes should be manifest in direct observations, reanalysis products, and RCMs. However, there are substantial differences in temporal trends derived from observational wind speed data, reanalysis products, and RCMs. The two observational data sets both exhibit an overwhelming dominance of trends toward declining values of the 50th and 90th percentile and annual mean wind speeds, which is also the case for simulations conducted using MM5 with NCEP‐2 boundary conditions. However, converse trends are seen in output from the North American Regional Reanalysis, other global reanalyses (NCEP‐1 and ERA‐40), and the Regional Spectral Model. Equally, the relationship between changing annual mean wind speed and interannual variability is not consistent among the different data sets. NCEP‐1 and NARR exhibit some tendency toward declining (increasing) annual mean wind speeds being associated with decreased (increased) interannual variability, but this is not the case for the other data sets considered. Possible causes of the differences in temporal trends from the eight data sources analyzed are provided.