| Popis: |
Fifty-five constant volume balloons (tetroons) were released in the fall of 1971 at Oklahoma City, Okla., and were ballasted to float at about 300 m over the city (elevation 400 m MSL) to trace local air currents. Twenty seven tetroons were recovered and, of these, the thirteen that were found between 400 and 1300 km from the city were included in this study. The trajectory end points of these thirteen tetroons were used to measure the accuracy of boundary-layer trajectory estimates begun at Oklahoma City and computed for the same time periods as the tetroon flights. Boundary-layer trajectory estimates were computed from sea level geostrophic vectors, layer-average winds (surface to 1000 m above terrain) and surface winds adjusted for “normal” shear to 300 m above terrain. Based on this study, it would appear that reasonably accurate boundary-layer trajectories can be estimated by making the following adjustments to generally available data: sea level geostrophic vectors should be backed by 20° i... |
