|
Ozone
Monitoring Network
|
- IMD's National Ozone Centre at New Delhi is designated as Regional
Ozone Centre for Regional Association II (Asia) of the World Meteorological
Organisation.
- The centre maintains and controls a network of ozone monitoring
stations including Maitri (Antarctica).
- Total ozone and Umkehr observations are recorded regularly during
the day at five stations using selective wavelengths in the UV region
with the help of Dobson Spectrophotometer.
- Brewer Spectrophotometers, having capability to monitor UV-B radiation
besides concentrations of total Ozone, SO2 and
NO2 simultaneously, were also introduced in
the existing network at two stations in 1994. One such additional
Brewer spectrophotometer was installed at Maitri(Antarctica) in July
1999.
- Vertical ozone profiles using indigenous balloon-borne ozone-sondes
are observed fortnightly at 4 stations including Maitri. Surface ozone
measurements using electrochemical method are recorded continuously
at 7 stations including Maitri.
- Ozone data is being regularly sent to World Ozone Data Centre, Canada
for archival. The data is available in the Internet on:
http://www.woudc.org..
- IMD is collaborating at both the national and international levels
through international intercomparison of instruments, conducting experiments
to study tropospheric ozone over the Indian ocean, comparing satellite
data with ground truth and studying diurnal and seasonal variations
in the ozone layer over Indian and Russian stations.
|