[1] Georgia Inst Technol, Sch Earth & Atmospher Sci, Atlanta, GA 30332 USA
[2] Natl Tech Univ Athens, Laser Remote Sensing Lab, Athens 15780, Greece
[3] Natl Observ Athens, IAASARS, Athens 15236, Greece
[4] Natl Ctr Sci Res Demokritos, Environm Radioact Lab, Inst Nucl & Radiol Sci & Technol Energy & Safety, Athens 15310, Greece
[5] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA
[6] Natl Observ Athens, Inst Environm Res & Sustainable Dev, Athens 15236, Greece
[7] Fdn Res & Technol Hellas, Inst Chem Engn Sci, Patras 26504, Greece