Satellite measurements of the Madden–Julian oscillation in wintertime stratospheric ozone over the Tibetan Plateau and East Asia
- 87 Downloads
We investigate the Madden–Julian Oscillation (MJO) signal in wintertime stratospheric ozone over the Tibetan Plateau and East Asia using the harmonized dataset of satellite ozone profiles. Two different MJO indices—the all-season Real-Time multivariate MJO index (RMM) and outgoing longwave radiation-based MJO index (OMI)—are used to compare the MJO-related ozone anomalies. The results show that there are pronounced eastward-propagating MJO-related stratospheric ozone anomalies (mainly within 20–200 hPa) over the subtropics. The negative stratospheric ozone anomalies are over the Tibetan Plateau and East Asia in MJO phases 4–7, when MJO-related tropical deep convective anomalies move from the equatorial Indian Ocean towards the western Pacific Ocean. Compared with the results based on RMM, the MJO-related stratospheric column ozone anomalies based on OMI are stronger and one phase ahead. Further analysis suggests that different sampling errors, observation principles and retrieval algorithms may be responsible for the discrepancies among different satellite measurements. The MJO-related stratospheric ozone anomalies can be attributed to the MJO-related circulation anomalies, i.e., the uplifted tropopause and the northward shifted westerly jet in the upper troposphere. Compared to the result based on RMM, the upper tropospheric westerly jet may play a less important role in generating the stratospheric column ozone anomalies based on OMI. Our study indicates that the circulation-based MJO index (RMM) can better characterize the MJO-related anomalies in tropopause pressure and thus the MJO influence on atmospheric trace gases in the upper troposphere and lower stratosphere, especially over subtropical East Asia.
KeywordsMadden–Julian Oscillation stratospheric ozone tropopause subtropical jet stream
Unable to display preview. Download preview PDF.
- Garfinkel, C. I., S. B. Feldstein, D. W. Waugh, C. Yoo, and S. Lee, 2012: Observed connection between stratospheric sudden warmings and the Madden–Julian Oscillation. Geophys. Res. Lett., 39, L18807, doi: 10.1029/2012GL053144.Google Scholar
- Liebman, B., and C. A. Smith, 1996: Description of a complete (interpolated) outgoing longwave radiation dataset. Bull. Amer. Meteor. Soc., 77, 1275–1277.Google Scholar
- Liu, C. X., Y. Liu, Z. N. Cai, S. T. Gao, D. R. Lu, and E. Kyrola, 2009: A Madden-Julian Oscillation-triggered record ozone minimum over the Tibetan Plateau in December 2003 and its association with stratospheric “low-ozone pockets”. Geophys. Res. Lett., 36, L15830, doi: 10.1029/2009GL039025.Google Scholar
- Liu, C. X., B. J. Tian, K.-F. Li, G. L. Manney, N. J. Liversey, Y. L. Yung, and D. E. Waliser, 2014: Northern Hemisphere mid-winter vortex-displacement and vortex-split stratospheric sudden warmings: Influence of the Madden-Julian Oscillation and Quasi-Biennial Oscillation. J. Geophys. Res., 119, 12599–12620, doi: 10.1002/2014JD021876.Google Scholar
- Tian, B. J., Y. L. Yung, D. E. Waliser, T. Tyranowski, L. Kuai, E. J. Fetzer, and F. W. Irion, 2007: Intraseasonal variations of the tropical total ozone and their connection to the Madden-Julian Oscillation. Geophys. Res. Lett., 34, L08704, doi: 10.1029/2007GL029451.Google Scholar
- Tian, B., and D. E. Waliser, 2012: Chemical and biological impacts. Intraseasonal Variability in the Atmosphere-Ocean Climate System, 2nd ed., W. K. M. Lau and D. E. Waliser, Eds., Springer-Verlag, Berlin, Heidelberg, 569–585.Google Scholar
- Waliser, D. E., 2012: Predictability and forecasting. Intraseasonal Variability in the Atmosphere-Ocean Climate System. 2nd ed., W. K. M. Lau and D. E. Waliser, Eds., Springer-Verlag, Berlin, Heidelberg, 433–476.Google Scholar
- Zhang, C. D., 2005: Madden-Julian Oscillation. Rev. Geophys., 43, RG2003, doi: 10.1029/2004RG000158.Google Scholar