Increase of ozone concentrations, its temperature sensitivity and the precursor factor in South China

Y. C. Lee; D. T. Shindell; G. Faluvegi; M. Wenig; Y. F. Lam; Z. Ning; S. Hao; C. S. Lai

doi:10.3402/tellusb.v66.23455

Increase of ozone concentrations, its temperature sensitivity and the precursor factor in South China

Tellus B: Chemical and Physical Meteorology

Volume 66 (2014): Issue 1

By: Y. C. Lee, D. T. Shindell, G. Faluvegi, M. Wenig, Y. F. Lam, Z. Ning, S. Hao and C. S. Lai

Open Access

|Jan 2014

Abstract

Concerns have been raised about the possible connections between the local and regional photochemical problem and global warming. The current study assesses the trend of ozone in Hong Kong and the Pearl River Delta (PRD) in South China and investigates the interannual changes of sensitivity of ozone to air temperature, as well as the trends in regional precursors. Results reveal, at the three monitoring sites from the mid-1990s to 2010, an increase in the mean ozone concentrations from 1.0 to 1.6 µg m⁻³ per year. The increase occurred in all seasons, with the highest rate in autumn. This is consistent with trends and temperature anomalies in the region. The increase in the sensitivity of ozone to temperature is clearly evident from the correlation between ozone (OMI [Ozone Monitoring Instrument] column amount) and surface air temperature (from the Atmospheric Infrared Sounder) displayed in the correlation maps for the PRD during the prominently high ozone period of July–September. It is observed to have increased from 2005 to 2010, the latter being the hottest year on record globally. To verify this temporal change in sensitivity, the ground-level trends of correlation coefficients/regression slopes are analysed. As expected, results reveal a statistically significant upward trend over a 14-year period (1997–2010). While the correlation revealed in the correlation maps is in agreement with the corresponding OMI ozone maps when juxtaposed, temperature sensitivity of surface ozone also shows an association with ozone concentration, with R=0.5. These characteristics of ozone sensitivity are believed to have adverse implications for the region. As shown by ground measurements and/or satellite analyses, the decrease in nitrogen oxides (NO₂) and NO_x in Hong Kong is not statistically significant while NO₂ of the PRD has only very slightly changed. However, carbon dioxide has remarkably declined in the whole region. While these observations concerning precursors do not seem to adequately support an increasing ozone trend, measured surface levels of formaldehyde, a proxy for volatile organic compound (VOC) emissions, have risen significantly in the PRD (2004–2010). Hence, the reactive VOCs in the PRD are likely to be the main culprit for the increase of ozone, as far as precursors are concerned. Despite the prevailing problem, model simulations suggest prospects for improvement in the future.

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Articles in this issue

DOI: https://doi.org/10.3402/tellusb.v66.23455 | Journal eISSN: 1600-0889

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Language: English

Page range: 23455 - 23455

Submitted on: Nov 28, 2013

Accepted on: Jul 9, 2014

Published on: Jan 1, 2014

Published by: Stockholm University Press

In partnership with: Paradigm Publishing Services

Keywords:

ozone trends,

temperature sensitivity of ozone,

sensitivity and concentration,

ozone precursors,

future ozone,

South China

© 2014 Y. C. Lee, D. T. Shindell, G. Faluvegi, M. Wenig, Y. F. Lam, Z. Ning, S. Hao, C. S. Lai, published by Stockholm University Press
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 66 (2014): Issue 1