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Remote Sens. 2018, 10(9), 1353; https://doi.org/10.3390/rs10091353

An Analysis of Factors Influencing the Relationship between Satellite-Derived AOD and Ground-Level PM10

1
Karlsruhe Institute of Technology (KIT), Institute of Meteorology and Climate Research, H.-v.-Helmholtz-Platz 1, 76344 Leopoldshafen, Germany
2
Karlsruhe Institute of Technology (KIT), Institute of Photogrammetry and Remote Sensing, Englerstr. 7, 76131 Karlsruhe, Germany
*
Author to whom correspondence should be addressed.
Received: 27 July 2018 / Revised: 22 August 2018 / Accepted: 22 August 2018 / Published: 25 August 2018
(This article belongs to the Special Issue Remote Sensing of Air Quality)
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Abstract

Air pollution can endanger human health, especially in urban areas. Assessment of air quality primarily relies on ground-based measurements, but these provide only limited information on the spatial distribution of pollutants. In recent years, satellite derived Aerosol Optical Depth (AOD) has been used to approximate particulate matter (PM) with varying success. In this study, the relationship between hourly mean concentrations of particulate matter with a diameter of 10 micrometers or less (PM10) and instantaneous AOD measurements is investigated for Berlin, Germany, for 2001–2015. It is found that the relationship between AOD and PM10 is rarely linear and strongly influenced by ambient relative humidity (RH), boundary layer height (BLH), wind direction and wind speed. Generally, when a moderately dry atmosphere (30% < RH ≤ 50%) coincides with a medium BLH (600–1200 m), AOD and PM10 are in the same range on a semi-quantitative scale. AOD increases with ambient RH, leading to an overestimation of the dry particle concentration near ground. However, this effect can be compensated if a low boundary layer (<600 m) is present, which in turn significantly increases PM10, eventually leading to satellite AOD and PM10 measurements of similar magnitude. Insights of this study potentially influence future efforts to estimate near-ground PM concentrations based on satellite AOD. View Full-Text
Keywords: Aerosol Optical Depth; PM10; MAIAC; MODIS; air quality; boundary layer height; ambient relative humidity Aerosol Optical Depth; PM10; MAIAC; MODIS; air quality; boundary layer height; ambient relative humidity
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Stirnberg, R.; Cermak, J.; Andersen, H. An Analysis of Factors Influencing the Relationship between Satellite-Derived AOD and Ground-Level PM10. Remote Sens. 2018, 10, 1353.

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