Ozone between 20 and 45 km altitude has been monitored since October 1990 and between 15 and 45 km altitude since February 1997.

The CGER ozone lidar is part of the Network for the Detection of Stratospheric Change (NDSC), which is an international network for observing stratospheric ozone and related species/parameters, and contributes to international cooperation.

Fig. 3 shows the seasonal variation in ozone number density which differs at each altitude, observed by the lidar, SAGE II, and ozonesonde.

In 1992, after the eruption of Mt. Pinatubo in the Philippines (June 1991), the ozone number density at 20 km altitude decreased but increased at 30 km altitude. This can be explained by the NOx decrease due to heterogeneous reactions on the sulfate aerosols and is consistent with the result of model calculations. The ozone number density at 25 to 35 km altitude seems to be continuously decreasing. Both anthropogenic causes as well as natural phenomena such as solar effects may be responsible, and studies to understand this phenomenon continue.

Figure 3. Time series of ozone mixing ratio at different altitudes, obtained
by lidar of NIES and sonde of JMA at Tsukuba

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-Information on Terms of Use-
Co-authorship shall be offered on publications using the Tsukuba lidar data within a two-year period after acquisition. Please contact Dr. Sugita (tsugita Add “@nies.go.jp” to the end of the address.). For the other Tsukuba-lidar data in a publication are requested to include the following acknowledgment: "The data used in this publication was obtained at National Institute for Environmental Studies(Japan) as part of the Network for the Detection of Stratospheric Change (NDSC) and is publicly available (see http://db.cger.nies.go.jp/gem/moni-e/, http://www.ndsc.ncep.noaa.gov).
You can download the data file for August 1988 to February 2010.
Show plots 1988 1989 1990 1991 1992 1993 1994 1995 1996(No data) 1997 1998 1999 2000 2001 2002 2003 2004 2005(No data)	Figure 4.  Example of vertical distribution of ozone over Tsukuba

• References
  • Nakane, H., S. Hayashida, Y. Sasano, N. Sugimoto, I. Matsui and A. Minato,Vertical profiles of temperature and ozone observed during DYANA campaign with the NIES ozone lidar system at Tsukuba, J. Geomag. Geoelectr., 44, 1071-1083, 1992.
    
  • Nakane,H., Y. Sasano, S. Hayashida-Amano, N. Sugimoto, I. Matsui, A. Minato and M. P. McCormick., Comparison of ozone profiles obtained with NIES DIAL and SAGE II measurements, J. Meteorol. Soc. Japan, 71, 153-159, 1993.