Long Term Trends Of Ozone Change And Its Relation To Atmospheric Temperature Variation Over China

In this study, a long-time series of global ozone datasets during 1979-2012 from SBUV(/2) Which is 5°latitude interval and a long-time series(1979- 2013) of tropospheric ozone are used to investigate the trends of global total ozone and the trend of the tropospheric ozone in China. The analysis shows that global ozone trends mainly controlled by the EESC. Before 1997, the global ozone showed significant declining trend; after 1997, global ozone showing recovery trend. In the past three decades,tropospheric ozone in China has presented an downward trend overall, the seasonal analysis showed that tropospheric ozone has presented an upward trend during the summer and a downward trend during the other three seasons.The methods of Multivariate regression analysis and harmonic function fitting were used to quantitatively assess the influences of major impact factors on global ozone changes and china tropospheric ozone changes. The major impact factors of global ozone include EESC、ENSO、Solar、QBO10pha、QBO30hpa、EHF、AO/AAO, of which the most influential factor is EESC, the biggest impact can reach 100 DU. Followed by the EHF QBO30 hpa, QBO10 hpa, ENSO, AAO/AO and Solar. Worldwide, Solar only make positive effect and EESC only make negative effect on ozone changes, other factors influence differences in phase, the effects was sometimes positive, sometimes negative. The major impact factors of china tropospheric ozone include ENSO、Solar、QBO、Precipitation. The influence of the solar cycle ranged from 5 to 10 DU. and the effects of the ENSO were 1 to 4 DU. The effects of the QBO averaged less than 2 DU. Meanwhile, the effects of the precipitation were 3 to 4 DU.The stratospheric ozone long-time series are formed by processing the total ozone datasets and tropospheric ozone datasets from NASA. With the temperature datasets from NECP are used to analysis the possible relationship between stratospheric ozone change and temperature change over china. The results showed that decreased ozone in the stratosphere results in lower temperatures, and is likely to affect the troposphere temperature. Relationship between stratospheric ozone and temperature are according to altitude, latitude and seasonal change. On the height, the correlation coefficient of ozone and temperature in the stratosphere are greater than which in the troposphere; on the latitudes, which in the high latitudes is greater than the lower latitudes; on the seasons, in the spring and winter, ozone and temperature mainly correlation significant in the low latitudes; in the summer and autumn, ozone and temperature mainly correlation significant in the high latitudes.