مدل سازی و پیش بینی وضعیت آلاینده های هوای شهر تهران کاربرد مدل خود رگرسیونی با ویژگی حافظه بلندمدت
الموضوعات :
1 - کارشناس ارشد اقتصاد محیط زیست، دانشگاه علامه طباطبایی *(مسوول مکاتبات)
2 - استادیار گروه اقتصاد کشاورزی و محیط زیست دانشکده اقتصاد دانشگاه علامه طباطبایی
الکلمات المفتاحية: پیش بینی, حافظه بلندمدت, مدل خودرگرسیونی هم انباشته کسر, آزمون GPH, آزمون R/S اصلاح شده,
ملخص المقالة :
زمینه و هدف: مدلسازی آلایندههای زیست محیطی یکی از نیازهای اساسی در زمینه پایش کیفیت هوا محسوب می شود که با بهرهگیری از نتایج حاصله میتوان اقدامات پیشگیرانهای جهت بهبود شرایط آتی اتخاذ کرد. ادبیات موجود در زمینه الگوسازی آلایندههای زیست محیطی را می توان به دو دسته کلی تقسیم کرد، دسته اول شامل مطالعاتی میشود که علاوه بر دادههای مربوط به آلایندهها با وارد کردن عوامل محیطی از قبیل دمای هوا، جهت وزش باد، سرعت وزش باد و میزان رطوبت، وضعیت انتشار را مورد بررسی قرار داده اند. دسته دوم مطالعات -که تحقیق حاضر در این دسته می گنجد- با استفاده از الگوهای رگرسیون سری های زمانی و غالباً با استفاده از دادههای موجود هر آلاینده، پیشبینی وضعیت آتی آن را مد نظر قرار دادهاند. روش بررسی: در این مقاله با استفاده از سه الگوی ARIMA(AutoRegressive Integrated Moving Average) ، ARFIMA(AutoRegressive Fractionaly Integrated Moving Average)و ARIMA-GARCH(Generalized AutoRegressive Conditional Heteroskedasticity) و رویکرد باکس-جنکینز وضعیت آتی آلایندههای CO ، PM10 ،NO2 ،SO2 ،O3 و PM2.5در شهر تهران پیشبینی شد و در مورد هر آلاینده بهترین مدل بر اساس معیارهای MSE(Mean Squared Error)،RMSE(Root Mean Squared Error) ،MAE(Mean Absolute Error) و MAPE(Mean Absolute Percent Error) معرفی گردید. یافته ها: آن چه این مطالعه را از مطالعات قبلی متمایز می سازد، مد نظر قرار دادن ویژگی حافظه بلندمدت و مقایسه دقت خروجی مدل مربوطه با الگوهای رایج خود رگرسیونی است. نتایج نشان میدهد که فرض وجود حافظه بلندمدت پذیرفته خواهد شد، ولی این که بهترین پیش بینیها همواره توسط مدل ARFIMA ارایه میشود، رد می شود. بحث و نتیجه گیری: این مطالعه کاربرد مدلهای اقتصادسنجی را برای پیشبینی وضعیت آلایندهها اثبات میکند. براین اساس توصیه میشود با توجه به هزینه های اجتماعی بالای انتشار آلاینده ها، با بکارگیری این الگوها، آلایندههای تأثیرگذار بر آینده هوای شهر شناسایی و در جهت کاستن از سطح انتشار آن ها طرحهای کارآمدی پیاده شود.
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- Tehran Air Quality Annual Report, 2012. Technical Report of the Air Quality Control Company, No. QM92/03/03/(U)/01. (In Persian)
- Bodaghpour, S., Charkestani, A., 2011. Prediction of gas pollutant's concentration by means of artificial neural network in Tehran urban air. Journal of environmental science and technology Volume 13 , Number 1 (48); 1-10.
- Ibarra-Berastegi, G., Elias, A., Barona, A., Saenz, J., Ezcurra, A., Diaz de Argandona, J., 2008. From diagnosis to prognosis for forecasting air pollution using neural networks: Air pollution monitoring in Bilbao. Environmental modeling and software, 23, 622-637.
- Pires, J. C. M., Martins, F. G., Sousa, S. I. V., Alvim-Ferraz, M. C. M., Pereira, M. C., 2008. Prediction of the daily mean PM10 concentrations using linear models. American Journal of Environmental Sciences, 4(5), 445-453.
- Ibrahim, M. Z., Zailan, R., Marzuki, I., Lola, M. S., 2009. Forcasting and time series analysis of air pollutants in several area of Malaysia. American Journal of Environmental Sciences, 5(5), 625-632.
- Marzuki, I., Ibrahim, M. Z., Ibrahim, A., Ahmad Makmon, A., 2011. Time series analysis of surface ozone monitoring records in Kemaman, Malaysia. Sains Malaysiana, 40(5), 411-417.
- Kumar, U., Ridder, K. D., 2010. GARCH modelling in association with FFT-ARIMA to forcast ozone episodes. Atmospheric Environment, 44, 4252-4265.
- Diaz-Robles, L. A., Juan, C. O., Joshua, S. Fu., Gregory, D. R., Judith, C. C., Watson, J. G., Moncada-Herrea, J. A., 2008. A hybrid ARIMA and artificial neural networks model to forecast particulate mater in urban areas: The case of Temuco. Chile. Atmospheric Environment, 42, 8331-8340
- Siew, L. Y., Chin, L. Y., Wee, P. M. J., 2008. ARIMA and integrated ARFIMA models for forecasting air pollution index in Shah Alam, Selangor. The Malaysian Journal of Analytical Sciences, 12(1), 257-263.
- Bagheri Soltanabadi, H., 2009. comparison of genetic planning and ARIMA time series models in Short Term Forecasting of Crude Oil Prices in Iran. MSc thesis. Faculty of economics, Ferdowsi University of Mashhad, Iran. (In Persian).
- Kumar, A., Goyal, P., 2011. Forecasting of daily air quality index in Delhi. Sience of the total environment, 409, 5517-5523.
- Saffarini, G., Odat, S., 2008. Time series analysis of air pollution in AL-Hashimeya Town Zarqa, Jordan. Jordan Journal of Earth and Environmental Sciences, 1(2), 63-72.
- Hurst, H. E., 1951. Long-term storage capacity of reservoirs. Transactions of the American society of civil engineers, 116, 770-779.
- Mandelbrot, B. B., Wallis, J., 1968. Noah, Joseph and operational hydrology. Water resources research, 4(5), 909-918.
- Baillie, R. T., Bollerslev, T., 1994. The long memory of the forward premium. Journal of international money and finance, 13(5), 565-571.
- Baillie, R. T., 1996. Long memory processes and fractional integration in econometrics. Journal of Econometrics, 73: 5-59.
- Festic, M., Kavkler, A., Dajcman, S., 2012. Long memory in the Croatian and Hungurian stock market returns. Zb. Rad. Ekon. Fak. Rij, 30(1), 115-139.
- Erfani, A., Jafari samimi, A., 2009. Long memory forecasting of stock price index using a fractionally differenced ARMA model. Journal of Applied sciences research, 5(10), 1721-1731.
- Bollereslev, T., 1986. Generalized autoregressive conditional Hetrokedasticity. Journal of Econometrics, 31, 307-328.
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- Granger, C. W. J., Joyeux, R., 1980. An introduction to long memory time series models and fractional differencing. Journal of time series analysis, 1(1), 15-29.
- Hosking, J. R. M., 1981. Fractional differencing. Biometrika, 68(1), 165-176.
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- Varotsos, C., Kirk-Davidoff, D., 2006. long-memory processes in ozone and temperature variations at the region 60 ͘S-60 ͘N. Atmospheric Chemistry and Physics, 6(12), 4093-4100.
- Geweke, J., Porter-Hudak, S., 1983. The estimation and application of long memory time series models. Journal of time series analysis, 4(4), 221-238.
- Hurst, H. E., 1957. A suggested statistical model of some time series that occur in nature. Nature, 180-494.
- Lee, D., Schmidt, P., 1996. on the power of the KPSS test of stationary against fractionally-integrated alternatives. Journal of Econometrics, 73, 285-302.
- Baillie, R. T., Chung, C-F., Tieslau, M. A., 1996. Analysing inflation by the fractionally integrated ARFIMA-GARCH model. Journal of applied econometrics, 11, 23-40.