Several studies in the June 1 issue of Geophysical Research Letters, published by the American Geophysical Union, analyze new data on ozone depletion. The obvious global decline in the ozone layer due to the rise in chlorofluorocarbons is marked by year-to-year and spatial variability. Stanley C. Solomon of the NOAA Aeronomy Laboratory in Boulder, Colorado, et al., analyze satellite data and model the period of ozone depletion from 1979 to 1997. The authors find that northern midlatitude ozone is sensitive not only to chlorine and volcanic aerosols but also to stratospheric temperature fluctuations and inferred circulation changes. The layered structure, always seen in ozonesonde data, makes it difficult to detect trends. R. Bradley Pierce and William B.Grant of NASA's Langley Research Center in Hampton, Virginia, examine the data for Wallops Island, Virginia, and distinguish between the influences of Rossby waves and gravity waves on the ozone laminae and evaluate the seas onal evolution and trends in ozone. Grant, et al., apply similar wave corrections to sonde data from the tropics and subtropics.