Davis ozonesonde measurements

The cathode solution (3.0cc) consists of 1% potassium iodide (KI) w/vol with potassium bromide (KBr) and buffers. The anode solution (1.5cc) is saturated KI solution. The solutions are made using 10g of KI, 25g of KBr, and added buffers, per litre of water.

Data holdings in the AADC consist of ASCII text files produced by BoM the World Ozone and Ultraviolet Radiation Data Centre (WOUDC). The WOUDC can also be accessed externally at woudc.org/data/explore.php by selecting 'OzoneSonde' under 'Dataset' and 'Davis (450)' under 'Station'. The data are obtained with approximately 10 metre vertical resolution (approximately 2 second sampling).

The data held at the AADC (including the WOUDC data) are provided in approximately 50 metre vertical resolution (10 second sampling). The 2 second data can be provided on request, although in practice, the time constant of the electrochemical cell (1/e time constant of approximately 20 seconds) means that the higher resolution does not necessarily provide more information. The WOUDC files contain the most detailed information, including information on applied calibrations and corrections, and integrated ozone amounts.

The main data fields presented are: air pressure (hPa), ozone partial pressure (mPa), temperature (K), wind speed (m/s), wind direction (degrees), elapsed time (sec), geopotential height (m), relative humidity (%), and electrochemical cell temperature (K). The BoM data contains a subset of this information, as well as accumulated ozone to each height (DU), and ozone remaining above this height to the top of the profile (DU).

The estimated total ozone column (from the ground to the top of the atmosphere) is also provided based on methods by the World Meteorological Organisation (see code 2 on page 27 of woudc.org/archive/Documentation/GuideBooks/O3_guide.pdf), and McPeters and Labow, 2011 (McPeters, R. D. and Labow, G. J.: Climatology 2011: An MLS and sonde derived ozone climatology for satellite retrieval algorithms, J. Geophys. Res.-Atmos., 117, D10303, doi:10.1029/2011JD017006, 2012).