Remote sensing of trace Na element in sea salt aerosol with a sensitivity level of 10 pg/m3 [Invited]

This is the authors' abstract. We don't add key points for this paper.

We have developed a remote sea salt aerosol fluorescence spectroscopy system integrating a high-power industrial-grade femtosecond laser to enhance detection sensitivity and precision in complex environments.This system successfully detects sea salt aerosol particles, achieving a detection limit of 0.015 ng/m 3 for neutral Na element (Na I) at 589 nm, with a detection range of 30 m.Our findings demonstrate significant improvements in remote aerosol monitoring, addressing previous challenges in long-range and high-precision sensing with a detection accuracy previously unattainable below 10 ng/m 3 .