Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2016-1101
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
22 Dec 2016
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Estimating daily surface NO2 concentrations from satellite data - A case study over Hong Kong using land use regression models
Jasdeep S Anand and Paul S Monks Atmospheric Chemistry Group, Department of Chemistry, University of Leicester, University Road, Leicester, LE1 7RH, UK
Abstract. Land Use Regression (LUR) models have been used in epidemiology to determine the fine-scale spatial variation in air pollutants such as nitrogen dioxide (NO2) in cities and larger regions. However, they are often limited in their temporal resolution, which may potentially be rectified by employing the synoptic coverage provided by satellite measurements. In this work a mixed effects LUR model is developed to model daily surface NO2 concentrations over the Hong Kong SAR during 2005-2015. In-situ measurements from the Hong Kong Air Quality Monitoring Network, along with tropospheric vertical column density (VCD) data from the OMI, GOME-2A and SCIAMACHY satellite instruments were combined with fine-scale land use parameters to provide the spatiotemporal information necessary to predict daily surface concentrations. Cross-validation with the in-situ data shows that the mixed effect LUR model using OMI data has a high predictive power (adj. R2 = 0.84), especially when compared with surface concentrations derived using the MACC-II reanalysis model dataset (adj. R2 = 0.11). Time series analysis shows no statistically significant trend in NO2 concentrations during 2005-2015, despite a reported decline in NOx emissions. This study demonstrates the utility in combining satellite data with LUR models to derive daily maps of ambient surface NO2 for use in exposure studies.

Citation: Anand, J. S. and Monks, P. S.: Estimating daily surface NO2 concentrations from satellite data - A case study over Hong Kong using land use regression models, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-1101, in review, 2016.
Jasdeep S Anand and Paul S Monks
Jasdeep S Anand and Paul S Monks
Jasdeep S Anand and Paul S Monks

Viewed

Total article views: 296 (including HTML, PDF, and XML)

HTML PDF XML Total BibTeX EndNote
222 63 11 296 6 12

Views and downloads (calculated since 22 Dec 2016)

Cumulative views and downloads (calculated since 22 Dec 2016)

Viewed (geographical distribution)

Total article views: 296 (including HTML, PDF, and XML)

Thereof 295 with geography defined and 1 with unknown origin.

Country # Views %
  • 1

Saved

Discussed

Latest update: 29 Mar 2017
Publications Copernicus
Download
Short summary
Previous investigations into Chinese urban air quality have been hampered by a lack of available data. In this work we present a new statistical modelling technique, in which sparse ground-based measurements of nitrogen dioxide (NO2) are combined with satellite data and other parameters (e.g. road networks) to create high resolution maps of daily surface NO2 concentrations over Hong Kong. These maps can be used to estimate population exposure, and to identify at-risk groups.
Previous investigations into Chinese urban air quality have been hampered by a lack of available...
Share