Abstract
A compact commercial Doppler lidar has been deployed in Indianapolis for two years to measure wind profiles and mixing layer properties as part of project to improve greenhouse measurements from large area sources. The lidar uses vertical velocity variance and aerosol structure to measure mixing layer depth. Comparisons with aircraft and the NOAA HRDL lidar generally indicate good performance, although sensitivity might be an issue under low aerosol conditions.
Highlights
The Indianapolis Flux Experiment (INFLUX) is aimed at improving methods for estimation of greenhouse gas emissions at urban scales
We discuss the role and utility of Doppler lidar observations to characterize the boundary layer during INFLUX
Utility of Doppler lidar for mass balance studies was demonstrated during the Uintah ozone study [1] where the NOAA High Resolution Doppler Lidar (HRDL, [2]) was used in conjunction with aircraft measurements to assess leakage from gas wells in the Uintah basin oil and gas field
Summary
The Indianapolis Flux Experiment (INFLUX) is aimed at improving methods for estimation of greenhouse gas emissions at urban scales. Current estimates rely on “bottoms-up” techniques, in which emissions from individual sources within the area of interest are summed to produce an overall estimate. The INFLUX experiment incorporates aircraft and surface-based observations, as well as chemical transport models, to investigate potential improvement in regional scale emissions gained by applying a topdown approach. INFLUX observational components include several-times-per-month aircraft measurements of gas concentrations and meteorological parameters, as well as a number of towers observing CO2, CH4, and CO and a single continuously operating Doppler lidar to estimate wind, turbulence and aerosol structure in the boundary layer.
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