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2.2.2.Upper-air land observationsÂ
DWD is providing the monthly statistics reports for both availability and quality monitoring categories. The availability results for the GCOS upper-air stations are based on DWD data assimilation system, whereas the quality results provided by DWD are based on the O-B departures from ECMWF data assimilation system. The availability reports contain information on all GCOS upper-air stations regarding the number of radiosonde soundings that reach the 30hPa level in the reported month. The quality reports contain the root mean square of O-B departures calculated for the sounding profiles of the following observed quantities: upper-air temperature, upper-air humidity and upper-air wind. Provision of these data reports (monthly), typically happens
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2 days after the end of the month.
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It is worth noting that contrary to the NWP monitoring, the monitoring of the GUAN stations only covers the radiosonde observations provided in the new Binary Universal Form for Representation of meteorological data (BUFR) reports.