Loading...

Estimating urban ground-level PM10 using MODIS 3km AOD product and meteorological parameters from WRF model

Ghotbi, S ; Sharif University of Technology | 2016

744 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.atmosenv.2016.06.057
  3. Publisher: Elsevier Ltd , 2016
  4. Abstract:
  5. Satellite remote sensing products of AOD from MODIS along with appropriate meteorological parameters were used to develop statistical models and estimate ground-level PM10. Most of previous studies obtained meteorological data from synoptic weather stations, with rather sparse spatial distribution, and used it along with 10 km AOD product to develop statistical models, applicable for PM variations in regional scale (resolution of ≥10 km). In the current study, meteorological parameters were simulated with 3 km resolution using WRF model and used along with the rather new 3 km AOD product (launched in 2014). The resulting PM statistical models were assessed for a polluted and largely variable urban area, Tehran, Iran. Despite the critical particulate pollution problem, very few PM studies were conducted in this area. The issue of rather poor direct PM-AOD associations existed, due to different factors such as variations in particles optical properties, in addition to bright background issue for satellite data, as the studied area located in the semi-arid areas of Middle East. Statistical approach of linear mixed effect (LME) was used, and three types of statistical models including single variable LME model (using AOD as independent variable) and multiple variables LME model by using meteorological data from two sources, WRF model and synoptic stations, were examined. Meteorological simulations were performed using a multiscale approach and creating an appropriate physic for the studied region, and the results showed rather good agreements with recordings of the synoptic stations. The single variable LME model was able to explain about 61%–73% of daily PM10 variations, reflecting a rather acceptable performance. Statistical models performance improved through using multivariable LME and incorporating meteorological data as auxiliary variables, particularly by using fine resolution outputs from WRF (R2 = 0.73–0.81). In addition, rather fine resolution for PM estimates was mapped for the studied city, and resulting concentration maps were consistent with PM recordings at the existing stations
  6. Keywords:
  7. AOD ; Mixed effects model ; PM10 ; WRF ; Meteorology ; Optical properties ; Radiometers ; Remote sensing ; Statistics ; Acceptable performance ; Meteorological parameters ; Meteorological simulations ; Mixed effects models ; MODIS ; Multi-scale approaches ; Particulate pollution ; Satellite remote sensing ; Multivariable systems
  8. Source: Atmospheric Environment ; Volume 141 , 2016 , Pages 333-346 ; 13522310 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S1352231016304903