Figure 7. Seasonal wind rose diagrams for the five sites and for Prudhoe Bay using three threshold minimum velocities

Figure 6. Eleven-day running averages of daily mean wind speed (m s1) , average maximum wind speed (m s1), and dispersion (standard deviation normalized by mean) for each day for the four seasonal periods

Figure 7. Seasonal wind rose diagrams for the five sites and for Prudhoe Bay using three threshold minimum velocities - continued - TR02-100029

TR02-10
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ERDC/CRREL TR-02-10

a. Threshold minimum velocity of 1.0 m s1.

Figure 7. Seasonal wind rose diagrams for the five sites and for Prudhoe Bay using three

threshold minimum velocities. The percentages listed for each season indicate the fractional

number of all data points for that season which met or exceeded the threshold criterion.

Labels for each octant indicate the mean wind speed for that direction for points that satisfied

the threshold criterion. Missing data values were excluded from all calculations.

By contrast, foothills IMN sees almost no winds with a significant easterly

component, while the intermediate SAG and WKU show a preponderance of SW

winds. Probabilities for strong winds (defined here as winds ≥10 m s1) are less

than 3% for any site in this season and less than 1% for the sites above the

coastal plain, while the rare strong winds tend to be from S to W. Though not

clearly evident from the plots shown here, during WS the upland sites, unlike

BET and FRA, did not show wind regimes that persisted several days. Also, the

strong wind events were frequently (though not always) quite transient and often

occurred near the end of the diurnal heating cycle consistent with outflow from

so-called air-mass convection. No winds exceeding 20 m s1 were seen at any site

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