A novel, reusable ozone filter design for the monitoring of biogenic volatile organic compounds using sorbent tubes and multi-tube samplers was evaluated. The ozone filters proved high efficiency in retaining high recovery rates across different environmentally relevant levels of relative humidity and ozone concentrations while safeguarding the sorbent material in both laboratory and field experiments. The filter design has the advantage of not requiring additional equipment or regular checks.

A method is introduced to expand the observational capability of a diode-laser-based lidar system. This method allows the lidar transmitter to change the laser pulse characteristics from one shot to the next. We use this capability to lower the minimum altitude of observation and to observe clouds with higher range resolution.