Acknowledgment

The authors sincerely thank NASA and the Institute of Space Technology for providing AERONET data (http://aeronet.gsfc.nasa.gov/). We gratefully acknowledge the working team (http://ready.arl.noaa.gov) for the global HYSPLIT data set. This research was funded by the Austrian Science Fund (FWF) through the Doctoral College GIScience (DK W 1237-N23) at the University of Salzburg. The authors would like to thank the anonymous reviewers for the critical comments and constructive suggestions toward improvement of the paper.

The authors would like to apologize for any inconvenience caused.

REFERENCE

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