Trends in Wind Speed at Wind Turbine Height of 80 m over the Contiguous United States Using the North American Regional Reanalysis (NARR)

摘要: AbstractThe trends in wind speed at a typical turbine hub height (80 m) are analyzed using the North American Regional Reanalysis (NARR) dataset for 1979–2009. A method, assuming profile lower boundary layer as power-law functions of altitude, is developed to invert power exponent (in equation) from NARR data and compute following variables 80 m that needed estimation interpretation trend speed: air density, zonal u, meridional υ, speed. Statistically significant positive annual found be predominant over contiguous United States, with spring winter being two largest contributing seasons. Positive surface generally smaller than those m, less spatial coverage, reflecting stronger increases altitudes above 80-m level. Large winds southeastern region high-mountain primarily du...