NH₃ Flux Measurements

We are measuring emissions and deposition of ammonia at sites with low to moderate fluxes (~ 10-100 ng m^-2 s^-1) using the eddy covariance technique. To accomplish the measurements, we developed an automated instrument to measure.  The instrument combines a QCL spectrometer (Aerodyne Res. Inc.) with a heated fast response inlet system, automated calibration system, sonic anemometer, and infrared gas analyzer for complementary measurements of CO₂ and H₂O fluxes.

A paper describing the instrument and measurements of NH₃ at a low background site in the Sierra Nevada, CA,
is available at the following link:
 Paper on NH3 flux measurements at  Blodgett Forest, USA

Some pictures of the instrument and deployments are shown below

 Instrument on stand at LBNL          Instrument deployed at 10m above Blodgett Forest                               




 
.