Photo: ECC Ozonesonde being launched in Fairbanks, Alaska. Photo courtesy of NOAA/ESRL Global Monitoring Division.
The DMT/EN-SCI ECC Ozonesonde was developed by Dr. Walter Komhyr and sold for decades by EN-SCI Corporation. It is now manufactured exclusively by DMT.
The Model DAS-2 Data Acquisition and Processing System allows for data acquisition, data processing, and post-processing analysis. The DAS-2 system includes the following components:
The user supplies the personal computer the DAS-2 system runs on.
Unlike some ozonesondes, ECC sondes do not require an external electrical potential. The ECC gets its driving electromotive force from the difference in the concentration of the potassium iodide solutions in the instrument’s cathode and anode chambers. When ozone enters the sensor, iodine is formed in the cathode half cell. The cell then converts the iodine to iodide, a process during which electrons flow in the cell’s external circuit. By measuring the electron flow (i.e., the cell current) and the rate at which ozone enters the cell per unit time, ozone concentrations can be calculated.
Information about the accuracy, precision and resolution of the DMT/EN-SCI ECC Ozonesonde appears below.
At 1000 hPa: ±5% accuracy, ±4% precision, 0.3 km resolution
At 200 hPa: ±12% accuracy, ±12% precision, 0.3 km resolution
At 100 hPa: ±5% accuracy, ±3% precision, 0.3 km resolution
At 10 hPa: ±5% accuracy, ±3% precision, 0.4 km resolution
At 4 hPa: ±10% accuracy, ±10% precision, 0.4 km resolution
Resolution figures correspond to approximately a 90% step change in ozone in one minute. Additional specifications appear below.
|Technique||Electrochemical process that generates electrical current in proportion to ozone concentrations|
|Measured Parameters||Ozone partial pressure, sonde housekeeping parameters|
|Operating Pressure||1050-4 hPa|
|Operating Temperature||0 – 40 °C
Inside flight box ambient temperature to -90 °C
|Power Requirements||12 – 18 VDC, 120 mA|
|Weight (including battery)||480 g for instrument, including wet battery
240 g for polystyrene flight box
|Instrument Dimensions||7.6 cm x 7.9 cm x 13.3 cm|
|Flight Box Dimensions||19.1 cm x 19.1 cm x 25.4 cm|
Specifications are subject to change without notice.
The DMT/EN-SCI ECC Ozonesonde is available in several models to accommodate different types of radiosondes or operating environments:
|Model Z||Fits Vaisala RS92 digital and analog radiosondes|
|Model 2Z-V2D(E)||Fits older Vaisala radiosondes|
|Model 2Z-V7||Fits InterMet radiosondes|
|Model 4Z||Designed for ground use|
Contact DMT for pricing or more information.
Phone: +001 303 440 5576
Komhyr, W.D., “Electrochemical Concentration Cells for Gas Analysis,” Ann. Geophys., 25: 203–210, 1969.
Komhyr, W.D., J.A. Lathrop, D.P. Opperman, R.A. Barnes, and G.B. Brothers, “ECC Ozonesonde Performance Evaluation during STOIC 1989,” J. Geophys. Res., 100(D5): 9231-9244, 1994.
Reid S.J., G. Vaughan, A.R. Marsh, and H.G.J. Smit (1996), “Intercomparison of Ozone Measurements by ECC Sondes and BENDIX Chemiluminescent Analyser,” J. Atm. Chem., 25, 215-226.
Smit, H. G.J, W. Straeter, B. J. Johnson, S. J. Oltmans, J. Davies, D. W. Tarasick, B. Hoegger, R. Stubi, F. J. Schmidlin, T. Northam, A. M. Thompson, J. Witte, I. Boyd, F. Posny (2007), “Assessment of the Performance of ECC-ozonesondes under Quasi-flight Conditions in the Environmental Simulation Chamber: Insights from the Jülich Ozone Sonde Intercomparison Experiment (JOSIE),” J. Geophys. Res., 112, D19306, doi:10.1029/2006JD007308.
Stübi R., Levrat G., Hoegger B., Viatte P., Staehelin J., Schmidlin F. J.: 2008, “In-flight Comparison of Brewer-Mast and Electrochemical Concentration Cell Ozonesondes,” J. Geophys. Res., 113, D13302, doi:10.1029/2007JD009091.
Terao, Y., and J. A. Logan (2007), “Consistency of Time Series and Trends of Stratospheric Ozone as seen by Ozonesonde, SAGE II, HALOE, and SBUV(/2),” J. Geophys. Res., 112, doi:10.1029/2006JD007667.