Study On The Trends And Chemical Process Of Trace Gases In Stratosphere

Since the stratospheric trace gases play an important role in the ecological environment and climate system on the earth, more attentions are paid on the trends of stratospheric trace gases including ozone, nitrogen oxide, nitrogen dioxide, chlorine hydride, water vapor, and methane etc. Firstly, this study investigates the trends of stratospheric trace gases, the correlation between ozone and ozone-relevant trace gases, and the correlation between ozone and temperature by analyzing the data from HALOE, SAGE II and ECMWF/ERA-40. And then the simulations were carried out by using the NCAR interactive chemical, dynamical and radioactive two-dimensional (SOCRATES) model to investigate the contribution of dynamical transport and photochemical processes to the budgets of ozone and the other trace gases. Another simulation has been done to investigate the effects of the increase of Chloro-Fluoro-Carbon release on the stratospheric trace gases. The obtained results are below:Firstly, by analyzing the HALOE data, the trends of O₃, NO, NO₂, HCl, HF, H₂O and CH₄ since 1992 are obtained, most of the tracer evolutions are discontinuous between 1997 and 1998 due to the Montreal Protocol. Ozone mixing ratio decreased slightly in stratosphere before 1998, after 1998 ozone mixing ratio was relatively stable and began to increase. NO_x, HF and HCl mixing ratio increased year by year before 1998, respectively. After 1998, NO_x, HF and HCl mixing ratio was relatively stable and began to decrease. Water vapor increased from 1992 to 1995, kept high value from 1996 to 2000, and decreased since 2000. The variation of Methane is not significant. In the middle and upper stratosphere, methane decreased slightly before 1998, while after 1998 methane kept the value or increased a little. The changes of Methane in the lower stratosphere opposed to that in the upper stratosphere. The tracers in HALOE data reveals dominant modes of variability consisting of annual, semiannual, and quasi-biennial oscillations (QBO). At low latitude zone, the semiannual variations occur most in the upper stratosphere, the QBO variations occur most in the middle stratosphere and the annual variations occur most in the lower...