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Chemistry and dynamics of tropospheric ozone in the background atmosphere of the Qinghai-Tibet Highland

Tropospheric ozone in remote regions of the Northern Hemisphere typically shows maximum in spring, however it peaks in summer northeastern part (Mt Wualiguan (WLG) Global Baseline Station) of the Qinghai-Tibet Plateau in western China. To find out reasons, we conducted two field measurements and modeling studies. The results show that (1) local NOx concentrations are high enough to sustain net formation of ozone summer; (2) downward transport of ozone from the stratosphere and the horizontal transport from developed eastern China contributed to surface ozone at WLG.


Figure 1. Average diurnal patterns of O3, CO, NO, NOy, and surface winds at WLG for (a) spring and (b) summer, error bars indicate standard errors.


Figure 2. Modeled O3 in situ productions, destruction, and net rates at WLG in (a)spring and (b) summer


Figure 3. (a) the 340K IPV map and back trajectories ending at 2-6 km over WLG at 1200 UTC 18 June, and (b) cross section of PV, wind speed and clear-air-turbulence on 100.9 E at 1200 UTC 18 June.

Related references:

  1. Xue, L. K., T. Wang*, H. Guo, D. R. Blake, J. Tang, X. C. Zhang, S. M. Saunders, and W. X. Wang. "Sources and Photochemistry of Volatile Organic Compounds in the Remote Atmosphere of Western China: Results from the Mt. Waliguan Observatory." Atmospheric Chemistry and Physics 13, no. 17 (2013): 8551-67.

  2. Xue, L. K., T. Wang*, J. M. Zhang, X. C. Zhang, Deliger, C. N. Poon, A. J. Ding, X. H. Zhou, W. S. Wu, J. Tang, Q. Z. Zhang, and W. X. Wang. "Source of Surface Ozone and Reactive Nitrogen Speciation at Mount Waliguan in Western China: New Insights from the 2006 Summer Study." Journal of Geophysical Research-Atmospheres 116 (Apr 2011): 12.

  3. Zhang, J. M., T. Wang *, A. J. Ding, X. H. Zhou, L. K. Xue, C. N. Poon, W. S. Wu, J. Gao, H. C. Zuo, J. M. Chen, X. C. Zhang, and S. J. Fan. "Continuous Measurement of Peroxyacetyl Nitrate (PAN) in Suburban and Remote Areas of Western China." Atmospheric Environment 43, no. 2 (Jan 2009): 228-37.

  4. Wang, T. *, H. L. A. Wong, J. Tang, A. Ding, W. S. Wu, and X. C. Zhang. "On the Origin of Surface Ozone and Reactive Nitrogen Observed at a Remote Mountain Site in the Northeastern Qinghai-Tibetan Plateau, Western China." Journal of Geophysical Research-Atmospheres 111, no. D8 (Apr 2006): 15.

  5. Ding, A. J. and T. Wang*. "Influence of Stratosphere-to-Troposphere Exchange on the Seasonal Cycle of Surface Ozone at Mount Waliguan in Western China." Geophysical Research Letters 33, no. 3 (Feb 2006): 4.

  6. Qing SG.; Ding AJ.; Wang T.*, Transport patterns of biomass burning in Euroasia and their impact on China, China Environmental Science(in Chinese), 2006.

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