Iowa State University Iowa Atmospheric Observatory 120-m Tall tower measurements (5-min statistics)
Datasets usually provide raw data for analysis. This raw data often comes in spreadsheet form, but can be any collection of data, on which analysis can be performed.
The data contains monthly netCDF formatted files from the
ISU tall tower instrumentation at the Iowa Atmospheric Observatory.
At five minute intervals, the 1 hertz data is
statistically summarized to determine the mean, median, minimum, maximum,
standard deviation, median absolute deviation, and the number of samples for
each five-minute averaging period. Data
is collected for each of the following meteorological variables (wind speed,
wind direction, air temperature, relative humidity, and air pressure) using
instruments (cup anemometer, wind vane, air temperature/relative humidity
probe, and barometer, respectively) mounted on two tall towers at six heights
above the ground surface (5 m, 10 m, 20 m, 40 m, 80 m, and 120 m). Duplicate measurements of wind speed, and
wind direction refer to cup anemometer and wind vane instrumentation on the WNW
and S oriented tower booms. One tower is
located in Rural Story Co. Iowa within a 200-turbine wind farm and the other
tower is located in Rural Hamilton Co. Iowa outside of the wind farm.
The data are supporting the analysis and
results contained within the article: “Observations show that wind farms
substantially modify the atmospheric boundary layer thermal stratification
transition in the early evening” submitted to Geophysical Research Letters (Rajewski
et al. 2020) to determine day-to-night changes in atmospheric stability,
buoyancy, and wind shear, in the wakes of single turbines and in the wake of a
utility-scale wind farm. Monthly
used in this article were taken from a portion of the June 2016- May
2018 data record to produce Figures 1-4 in the manuscript.
Data were also used from June 2016-September 2016 in the analysis presented in the IAO introductory publication (Takle et al. 2019).
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