Abstract
We utilize the tropospheric NO2 columns derived from the observations of Ozone Monitoring Instrument (OMI) onboard AURA to analyze the spatial distributions and temporal trends of NO2 in Wanjiang City Belt (WCB) of China from 2005 to 2016. The aim of this study is to assess the effect of industrial transfer policy on the air quality in WCB. Firstly, we used the surface in situ NO2 concentrations to compare with the OMI-retrieved tropospheric NO2 columns in order to verify the accuracy of the satellite data over the WCB area. Although it is difficult to compare the two datasets directly, the comparison results prove the accuracy of the OMI-retrieved tropospheric NO2 columns in cities of WCB. Then, the spatial distributions of the annual averaged tropospheric NO2 total columns over Anhui Province show that NO2 columns were considerably higher in WCB than those in other areas of Anhui. Also, we compared the spatial distributions of the total NO2 columns in 2005 through 2010 and in 2011 through 2016 and found that the total NO2 columns in WCB increased by 19.9%, while the corresponding value increased only 13.9% in other Anhui areas except the WCB area. Furthermore, the temporal variations of NO2 columns show that although the NO2 columns over WCB and Anhui increased significantly from 2005 to 2011, they decreased sharply from 2011 to 2016 due to the strict emission reduction measures in China. Finally, the HYSPLIT model was used to analyze the origins of NO2 and transport pathways of air masses in a typical city, Ma’anshan city.
Highlights
Nitrogen dioxide (NO2) is a reactive, short-lived atmospheric trace gas with both natural and anthropogenic sources
E aim of this study is to describe the spatial distributions and temporal trends of tropospheric NO2 based on satellite observations in twelve years in Anhui, in order to assess the effect of industrial transfer policy on the air quality in Wanjiang City Belt (WCB). is paper is organized as follows
We used the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model developed by National Oceanic and Atmospheric Administration (NOAA) to simulate the back trajectories of air mass [37]. e HYSPLIT model is a complete system, which has been extensively used in calculation of air mass trajectories, atmospheric transport, and dispersion. e model is often used to locate the origin of air masses and build the relationships between source and receptor by back trajectory analysis [38]. e input for the HYSPLIT model is the Global Data Assimilation System (GDAS) meteorological data, which are available at the GDAS website
Summary
Nitrogen dioxide (NO2) is a reactive, short-lived atmospheric trace gas with both natural and anthropogenic sources. A series of sun-synchronous satellites were launched with spectrometers, which allowed scientists to observe the global distribution of several important tropospheric trace gases including NO2, SO2, and O3 Satellite observations make it easy to understand the spatiotemporal variations of atmospheric NO2 [10,11,12,13]. Lamsal et al examined the seasonal variation in lower tropospheric NO2 by the observation of the OMI, in situ surface measurements, and a global GEOS-Chem model [9]. Gu et al used the NO2 columns observed from OMI and the Community Multiscale Air Quality (CMAQ) model to derive the ground-level NO2 concentrations in China [15]. E aim of this study is to describe the spatial distributions and temporal trends of tropospheric NO2 based on satellite observations in twelve years in Anhui, in order to assess the effect of industrial transfer policy on the air quality in WCB.
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