Instrument : Aethalometer (AETH)
The aethalometer is an instrument that provides a real-time readout of the concentration of “black” or “elemental” carbon aerosol particles (BC or E) in an air stream. It is a self-contained instrument that measures the rate of change of optical transmission through a spot on a filter where aerosol is being continuously collected and uses the information to calculate the concentration of optically absorbing material in the sampled air stream. The instrument measures the transmitted light intensities through the “sensing” portion of the filter, on which the aerosol spot is being collected, and a “reference” portion of the filter as a check on the stability of the optical source. A mass flowmeter monitors the sample air flow rate. The data from these three measurements is used to determine the mean BC content of the air stream.
The aethalometer performs the optical analysis and data readout “on the spot.” The results are available immediately to the user without having to wait to analyze a sample at a laboratory. It is a self-contained, automatic instrument, and it requires no consumable materials, no gas cylinders, and no operator attention. The only calibration required is a periodic check of the air flowmeter response.
The AETH is part of the Aerosol Observing System (AOS).
- aosaeth : AOS: Aethalometer, measures Black Carbon
- aosaeth1spot : Single spot AethalometerÂ®
- aosaeth2spot : Definition needed
The following measurements are those considered scientifically relevant.
|North Slope Alaska|
|NSA||X1||Browse Data||External Data (satellites and others)|
|ARM Mobile Facility|
|ASI||M1||Browse Data||Ascension Island, South Atlantic Ocean; AMF1|
|MAO||S1||Browse Data||Manacapuru, Amazonas, Brazil; MAOS|
|PVC||S1||Browse Data||Highland Center, Cape Cod MA; MAOS||retired|