In order to observe directly a detailed vertical distribution of ozone up to an elevation of about 35 km, ozonesondes are launched with a balloon for measuring ozone concentrations of intaken air. The RS2-KC96 ozonesonde used by JMA up to 2010 is an electrochemical ozonesonde utilizing the principle of galvanic cells, which measures the oxidation reduction current generated when air containing ozone is injected into a potassium iodide (KI) solution to obtain the ozone concentration. Starting from November 2008 at Naha, December 2009 at Sapporo and Tsukuba and April 2010 at Syowa Station, JMA uses a combination of ECC-type ozone sensor and GPS radiosonde. The ECC-type ozone sensor also uses KI solution but differs from the RS2-KC96 ozonesonde in that is utilizes the principle of concentration cells to measure oxidation reduction current.
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Fig. 7.2.9.1 KC Type (left) and ECC Type (right) ozonesonde. |
GAW stations for the ozone layer and ultraviolet radiation observation | Total ozone observation | Umkehr observation | Ozonesonde observation | Calibration for total ozone observation