|
UPSI Digital Repository (UDRep)
|
|
| ||||||||||||||||
| Abstract : |
| This paper investigates the persistency properties of ozone concentrations at eight selected air quality monitoring stations situated in uban and suburban area of Peninsular Malaysia. Daily maximum hourly data of ozone concentration in 1998-2009, is used in this study. In describing the persistency, the scaling analysis, namely Detrended Moving Median (DMM) method was used to estimate the degree of persistency, known as Hurst estimator, H. This method is the adaptation of the Detrended Moving Average (DMA) method. The finding showed that there are three different scaling regions separated by a critical time scale, nc 1 and nc 2 which is around 8 month and 2 years. For shorter time scale (n < nc 1) and larger time scale (n > nc 2), the ozone concentration are persist and it remain high which the H values are showed between 0.5 < H < 1 for the most of monitoring stations in urban area. While, in suburban area, the persistency of ozone concentration are as similar as result for urban area. But a weakly persistency of ozone concentration are seen on a middle time scale (nc 1 < n < nc 2). Therefore, these findings provide scaling behaviour and persistence in ozone concentration in the ambient air in urban and suburban area of Peninsular Malaysia. |
| References |
1.Cannon, M.J., Percival, D.B., Caccia, D.C., Raymond, G.M., Bassingthwaighte, J.B. Evaluating scaled windowed variance methods for estimating the Hurst coefficient of time series (1997) Physica A: Statistical Mechanics and its Applications, 241 (3-4), pp. 606-626. Cited 136 times. http://www.journals.elsevier.com/physica-a-statistical-mechanics-and-its-applications/ doi: 10.1016/S0378-4371(97)00252-5 2. Varotsos, C., Ondov, J., Efstathiou, M. Scaling properties of air pollution in Athens, Greece and Baltimore, Maryland (2005) Atmospheric Environment, 39 (22), pp. 4041-4047. Cited 143 times. doi: 10.1016/j.atmosenv.2005.03.024 3. Zhu, J., Liu, Z. Long-range persistence of acid deposition (2003) Atmospheric Environment, 37 (19), pp. 2605-2613. Cited 25 times. www.elsevier.com/locate/atmosenv doi: 10.1016/S1352-2310(03)00219-x 4. Chelani, A.B. Statistical persistence analysis of hourly ground level ozone concentrations in Delhi (2009) Atmospheric Research, 92 (2), pp. 244-250. Cited 26 times. doi: 10.1016/j.atmosres.2008.12.001 5. Beran, J. (1994) New York: Chapman & Hall 6. Air Quality Division of the Department of the Environment Malaysia, (DOE) 7. Alam Sekitar Sdn Bhd (ASMA) 8. Carbone, A., Castelli, G., Stanley, H.E. Analysis of clusters formed by the moving average of a long-range correlated time series (2004) Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 69 (2 2), art. no. 026105, pp. 026105-1-026105-4. Cited 122 times. doi: 10.1103/PhysRevE.69.026105 |
| This material may be protected under Copyright Act which governs the making of photocopies or reproductions of copyrighted materials. You may use the digitized material for private study, scholarship, or research. |