Multi-beam MU radar measurements of advective accelerations in the atmosphere

A method is developed to calculate nonlinear zonal, s(x), and meridional, s (y), longitudinal advective accelerations from MU radar observations with a ntenna beam scanning in eight directions. The results of measurements of s( x) and s(y) at altitudes of 2 - 18 km on April 16 - 18, 1997, are presented . The values of s(x) and s(y) are mainly between -0.01 m s(-2) and 0.01 m s (-2) with increases up to +/-0.04 m s(-2) during tens of minutes to several hours in regions with vertical scales up to several kilometers. Such extre mes are more frequent at the altitudes of tropo-stratospheric jet at 10 - 1 5 km and may indicate regions of inclination from geostrophic balance and o f increased generation of atmospheric waves.