Hugo De Backer, KMI, Ringlaan 3, B-1180 Brussels

COST 723 MC+WG1 meeting, Bern, 6-7 Oct 2003

Royal Meteorological Institute Hugo De Backer

Ozone, Temperature and Humidity Profile Measurements with

Radiosondes at Uccle (Belgium)

Ozone & Radiodsondes at UccleLocation

All observations are at Uccle

50°48’N, 4°21’E at 100 m above sea level

suburb at the south of Brussels

Hugo De Backer, KMI, Ringlaan 3, B-1180 Brussels COST 723 MC+WG1 meeting, Bern, 6-7 Oct 2003

Ozone & Radiodsondes at UccleOzone Profiles

Time series since 1969 until now

Sonde type:• 1969-March 1997: Brewer-Mast• April 1997 - now: ECC (Ensci 0.5% solution)

Data set homogenised

Altitude range: 0 - ~32km

Vertical resolution: better than 200m

Errors:• 5% in troposphere• 15% near tropopause• 5% at ozone maximum• increasing at higher levels (10-15% at burst level)

Hugo De Backer, KMI, Ringlaan 3, B-1180 Brussels COST 723 MC+WG1 meeting, Bern, 6-7 Oct 2003

Ozone & Radiodsondes at UccleOzone Profiles

Frequency of observations:

Normally on Mondays, Wednesdays and Fridays (except holidays) at 12UT.Some interruptions (before 1989)Sometimes additional ascents (e.g. summer of 1997, daily)

Data were already used for comparison with SAGEII profiles

Data available for comparison/validation

Hugo De Backer, KMI, Ringlaan 3, B-1180 Brussels COST 723 MC+WG1 meeting, Bern, 6-7 Oct 2003

Ozone & Radiodsondes at UccleRadiosondes

Radiosondes measure (vertical resolution ~200m):

• Pressure• Temperature• Relative Humidity (in troposphere)• Wind

Soundings performed at 00UT and 12UT (until 31/10/2003, then as ozone soundings (Mo, We and Fr).

Note: Due to restrictions in funding we will have to review our contributions to COST723, especially our plans for participation in WG3.

Hugo De Backer, KMI, Ringlaan 3, B-1180 Brussels COST 723 MC+WG1 meeting, Bern, 6-7 Oct 2003

Ozone & Radiodsondes at UccleHugo De Backer

THE ENDTHE END

Hugo De Backer, KMI, Ringlaan 3, B-1180 Brussels COST 723 MC+WG1 meeting, Bern, 6-7 Oct 2003