Jennifer A. Logan
OZONE TRENDS IN THE STRATOSPHERE AND TROPOSPHERE.
Stratospheric ozone decreased at northern mid-latitudes between the end of the 1970s and the mid-1990s. More recently, ozone levels have leveled off in the lower stratosphere, 12-25 km. The main sources of information on trends in the vertical distribution of ozone are balloon-borne sounding (ozonesondes), and satellite data. We examined the consistency of the long-term records of ozonesondes and three satellite instruments, SAGE II, HALOE, and SBUV (a newly released data set).
Long-term (25 year) trends in tropospheric ozone profile averaged over the northern extratropics are essentially zero. However, the trends vary regionally, and with the particular time considered, as summarized in Chapter 3 of the 2006 Assessment.
We analyzed trends in multiple data sets for tropospheric ozone over Europe, where there are more long time series os measurements than anywhere else in the world. However, they do not become self-consistent until the late 1990s (Logan et al., 2012).
PAST WORK ON OZONE TRENDS:
Cunnold, D. M., H. J. Wang, L. Thomason, J. Zawodny, J. A. Logan and I. A. Megretskaia, SAGE (v.5.96) ozone trends in the lower stratosphere, J. Geophys. Res., 105, 4445-4457, 2000.
Logan, J.A., I. A. Megretskaia, A. J. Miller, et al., Trends in the vertical distribution of ozone: a comparison of two analyses of ozonesonde data, J. Geophys. Res., 104, 26373-26399, 1999. [PDF]
Randel, W. J., R. S. Stolarski, D. M. Cunnold, J. A. Logan, M. J. Newchurch, and J. Zawodny, Trends in the vertical distribution of ozone, Science, 285, 1689-1692, 1999.
Logan, J. A., Trends in the vertical distribution of ozone: An analysis of ozonesonde data, J. Geophys. Res., 99, 25553-25585, 1994. [PDF]
Logan J. A., Tropospheric ozone: seasonal behavior, trends and anthropogenic influence. J. Geophys. Res., 90, 10,463-10,482, 1985.
SUPPORT: NASA, NSF