STN 174 (Lindenberg, Germany) Ozonesonde Report 
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From 1975-1992 DWD-MOL used to launch a sonde called OSE. This sonde was manufactured
in the former GDR and was very similar to a Brewer-Mast-sonde.  These sondes used to 
work with the radiosonde RKS(MRZ), which were produced in Russia. The measurment cycle 
of these sondes was not continious. DWD-MOL received informations about a specific 
component for a period of twenty to thirty  seconds, i.e. 20 sec temperature, 
20 sec humidity, 20 sec fix value, 20 sec ozone and then 20 sec temperature again and so on. 
 
In 1990, DWD-MOL determined a new pump correction factor for OSE sondes 
(lab-examinated by Steinhagen and Goersdorf):
 
pressure pump-cor-old pump-cor-new
1000       1.000      1.029
 500       1.000      1.037
 300       1.000      1.044
 200       1.000      1.046
 100       1.010      1.051
  50       1.035      1.076
  30       1.065      1.123
  20       1.092      1.199
  10       1.170      1.388
   5       1.300      1.686 
 

From March 1992 to July 1992 DWD-MOL used to launch both types of sondes in parallel, 
ECC and OSE sondes, to establish the differences in measurements between these types.
 
In 1994 DWD-MOL corrected the ozone measurements from 1975 to 1992 (for the OSE sondes) by 
recalculation of all launches with a new pump correction factor. 
 
Due to this recalculation, it was determined that the differences between the OSE and ECC 
sondes were minimal, in vertical profiles. This result was examinated by 9 tandem-soundings
of both OSE and ECC sondes.
 
The corrected dataset for OSE-data is marked with the commented notation:
"with pump correction values 1990/94".  
 
Since 01. Apr 1992 DWD-MOL has used the ECC-sonde together with the RS80 radiosonde.

 
H. Dier (DWD-MOL)
February 2004