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

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: ,  ,  ,  ,  ,  ,   and    
Open Access
|Jan 2014
Figures & tables

Figures & Tables

Fig. 1

Map of Hong Kong and the Pearl River Delta region of South China (HKO: Hong Kong Observatory), based on Croquant, 2007 (http://commons.wikimedia.org./wiki/File:Pearl_River_Delta_Area.png).

Fig. 2

Daily maximum and mean ozone concentrations versus daily maximum temperature in Hong Kong (Central Western) 1994–2008.

Fig. 3

Mean ozone concentrations in Hong Kong (Central Western, Tsuen Wan and Sha Tin) in autumn 1994/1997–2010.

Fig. 4

Seasonal increase of ozone (mid/late 1990s to 2010) and air temperature trend (1971–2010) in Hong Kong (10% error bars).

Table 1. Observed ozone trend in Hong Kong 1994/97/98–2010 (µg m−3 change per year)

Observed O3 trend (µg/m3 change per year), Hong KongCentral Western (1994–2010)Sha Tin (1997/98–2010)Tsuen Wan (1998–2010)Spring0.961.220.86Summer0.760.620.54Autumn1.311.621.00Winter0.751.190.56
Fig. 5

Seasonal ozone concentrations in Guangzhou in the Pearl River Delta, 2006–2010 showing linear curve fit and upward trends.

Fig. 6

Temperature anomaly (at 925 hPa) in (a) spring (b) summer (c) autumn and (d) winter in South China 1996–2010.

Fig. 7

(a) Correlation between OMI column amount ozone (DU) and AIRS surface air temperature (Kelvin), NEESPI, for the period of 1 July–30 September of 2005, 2008 and 2010 for the Pearl River Delta and 2010 for South/SW China. (b) Column amount ozone for the same period and years: PRD.

Fig. 8

(a) Trend of ozone sensitivity (correlation coefficients/slopes of regression) to temperature in Hong Kong (Sha Tin) 1997–2010 (b) Relationship between temperature sensitivity and maximum ozone in Hong Kong (spring, summer and autumn) (Sha Tin and Central Western) 1996/1998–2010.

Table 2. Trends of ozone precursors and temperature sensitivity, Hong Kong/Pearl River Delta (PRD)

O3 precursors & temperature sensitivity of O3Trendp-value of slope of trendHong Kong Temperature sensitivity of isoprenea (correlation coefficientb vs. yr) (2000–2009)0.022/yr0.26 Temperature sensitivity of ozonec (correlation coefficientb vs. yr) (1997–2010)0.0148/yr<0.05d NOxa (1997–2010)−0.056 µg m−3/yr0.236 NO2a (1997–2010)−0.035 µg m−3/yr0.259 COe (1997–2010)−0.204 µg m−3/yr<0.001d Total VOCa (2000–2010)−2.59 µg m−3/yr0.003d Formaldehyde  Summer−0.0106 µg m−3/yr0.023d  Autumn−0.0106 µg m−3/yr0.025dGuangzhou (October, 2004–2010) NO2 (tropospheric column amount)−0.004 (1015 molecules/cm2)/yr0.002d Formaldehyde (column amount)0.003 (1015 molecules/cm2)/yr<0.001d

[i] aCentral Western (Hong Kong island).

[ii] bCorrelation coefficient is unitless.

[iii] cSha Tin.

[iv] dSignificant at 95% confidence level.

[v] eTsuen Wan.

Fig. 9

NOx, NO2 and VOC (total) (Central Western) and CO concentrations (Tsuen Wan) in Hong Kong 1997–2010. Notes: (a) VOC measurement commenced in 2000. (b) No CO data are available from Central Western.

Fig. 10

NO2 OMI tropospheric column amount (clear, 0–30% cloud) and HCHO column amount, Guangzhou (PRD), Oct 2004–Dec 2010 (1015 molecules/cm2).

Fig. 11

(a) OMI NO2 tropospheric column amount in the Pearl River Delta/South China Region, autumn 2005 and 2010 and summer 2010 (b) AIRS total column concentration of carbon monoxide (CO) (1018 molecules/cm2) in 2002 and 2010 autumn.

Fig. 12

Reactive VOCs: formaldehyde, acetaldehyde and isoprene in Hong Kong (Central Western), to 2010 in summer.

Fig. 13

OMI Formaldehyde column amount in autumn of 2004–2010 in the Pearl River Delta/South China region.

Fig. 14

Ozone trend (July–November) 2002–2051 by CESM (under RCP 4.5).

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

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