Differences between Measured and Linearly Interpolated Synoptic Variables over a 12-h Period during AVE IV

摘要

Differences between measured values of synoptic variables and like variables interpolated linearly from 12-h data were computed over 3, 6, and 9-h intervals within bracketing 12-h rawinsonde soundings by using the unique 3-h rawinsonde data from NASA's fourth Atmospheric V arability Experiment (AVE IV) conducted on 24 and 25 April 1975. These differences represented the nonlinear change in the variables or the amount of change over a time interval (3, 6, or 9 h) that was not accounted for by assuming a linear change through a 12-h period.nResults of analyses revealed that nonlinear changes or differences formed centers or systems that were mesosynoptic in nature. These systems correlated well in space with upper-level short waves, frontal zones, and radar-observed convection, and were very systematic in time and space. Many of the centers of differences were well established in the vertical, extending up to the tropopause.