کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6341493 1620392 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Estimation of sulfur dioxide air pollution concentrations with a spatial autoregressive model
ترجمه فارسی عنوان
برآورد غلظت آلودگی هوا دی اکسید گوگرد با یک مدل اتورگرسی فضایی
کلمات کلیدی
آلودگی هوا، دی اکسید گوگرد، مانیتورینگ موبایل، رگرسیون استفاده از زمین، مدل خطای فضایی، همیلتون، انتاریو، کانادا،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
چکیده انگلیسی


- Few land use regression models have evaluated spatial effects prompting this study.
- Application of OLS regression violated the independence of errors assumption.
- Spatial error model removed spatial autocorrelation of residuals.
- Locations' direction to source and wind direction alignment is a strong predictor.
- Mobile monitoring data are applicable for land use regression.

In this paper, we develop a land-use regression model for sulfur dioxide air pollution concentrations. We make use of mobile monitoring data collected in Hamilton, Ontario, Canada, between 2005 and 2010 inclusive. The observed SO2 concentrations are regressed against a comprehensive set of land use and transportation variables. Land use and transportation variables are assessed as the amount of each characteristic within buffers of 50, 100, 200, 400, 800, and 1600 m around pollution observation locations. In the first instance of regression modeling, we apply ordinary least-squares regression. The OLS model R2 for training data was 0.38, and an R2 of 0.3 for a 50% held out cross-validation data set. The residuals are spatially correlated with the OLS model as determined with Moran's I. We thus applied a simultaneous autoregressive model, specifically the spatial error model. The resulting model slightly improved fit as determined by a pseudo R2 = 0.4, improved log-likelihood, and reduced MSE, RMSE, and MAE. The spatial error model residuals were not spatially auto-correlated, resulting in a valid model. SAR modeling is a natural extension to OLS regression models and solves the issue of spatial autocorrelation in model residuals with a one-stage model.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Environment - Volume 79, November 2013, Pages 421-427
نویسندگان
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