Response And Related Mechanism Of Stratospheric Ozone In The Summer Northern Hemisphere To The Quasi-11 Years Ultraviolet Cycle Of The Sun

The ozone is the main heat source in the stratosphere which can affect the temperature structure of the atmospheric. The stratosphere and troposphere mutual coupling will ultimately affect the climate of the troposphere. The ultraviolet radiation play an important role in ozone formation and dissolution. The latest spectral data detect by SIM detector on SORCE satellite show that the change of ultraviolet radiation in solar cycle have 4 to 6 times higher than ever before to know. Therefore, we use the CESM model which coupling dynamic, radiation and chemical process and SIM spectral data conduct sensitivities numerical simulation experiment than analyzed stratospheric ozone response to the solar ultraviolet circulation at the northern hemisphere in summer and its chemical and dynamic mechanism. The main conclusions listed as follows:(1) At first we use the ozone in MLS satellite data and the ERA-interim reanalysis data of temperature and wind field to evaluate the performance of CESM model found that the model have a good simulation effect in ozone, temperature, wind field and the Tibetan Plateau ozone valley.(2) Second we put SIM ultraviolet radiation data of relatively strong and weak years into model as sensitivity experimental. The difference between the two experimental indicated that in relatively strong year of the solar ultraviolet radiation stratospheric ozone concentration increase in summer. The total ozone column is increase in most of the northern hemisphere in summer. The Tibetan Plateau also increase. But the extent of increase is smaller than the same latitude which lower the ozone low center in this region.(3) Moreover we using reaction rate of ozone related chemical reaction which from the model output to analyzes the chemical mechanism of the response in the northern hemisphere in summer. The results show that the solar ultraviolet radiation in relatively high years that stratospheric ozone concentration increased by chemical reaction. The strongest increased is ozone-generated reaction and the magnitude is 1010 molecule per cubic centimeter per second, other ozone-depleting reaction magnitude less than or equal to 107 molecule per cubic centimeter per second. In the region of the Tibetan Plateau the ozone generation is the largest also, but the range of the increased is smaller than the same latitude, lead to the low center is lower.(4) At last we using the output of the model ozone and wind speed to calculate the ozone flux and the flux divergence analyses the dynamic mechanism of the response in the northern hemisphere in summer. The results show that the ultraviolet radiation in relatively strong years net convergence at 30°N in the stratosphere. Tibetan Plateau divergence to northwest lead to lower the center of ozone.