Publication Date:
2017-04-04
Description:
On January 2009 a ground-based millimeter-wave spectrometer (GBMS) was installed
at Thule Air Base (76.5ºN, 68.8ºW), Greenland, for long-term winter monitoring of several stratospheric and mesospheric trace gases in the framework of the Network for the Detection of Atmospheric Composition Change. This work is aimed at characterizing the GBMS O3 vertical profiles between 35 and 80 km altitude obtained by applying the
optimal estimation method to O3 pressure-broadened spectral line measurements carried
out during three winters. In this altitude range, GBMS O3 retrievals are highly
sensitive to variations of the atmospheric state, and their accuracy is estimated to be
the larger of 11% or 0.2 ppmv. Comparisons of GBMS O3 profiles with colocated
satellite-based measurements from Aura Microwave Limb Sounder (MLS) and
Thermosphere Ionosphere Mesosphere Energetics and Dynamics Sounding of the
Atmosphere using Broadband Emission Radiometry (SABER) show a good agreement
below 65 km altitude once the known 10%–20% high bias of SABER O3 profiles is considered, with the GBMS displaying an averaged low bias of 9% and 17% with
respect to MLS and SABER. In the nighttime mesosphere, the GBMS detects the ozone tertiary maximum within 0.1 ppmv (6%) on average with respect to the convolved MLS, SABER, and global 3-D ROSE model profiles but shifts its position to lower altitudes by 4–5 km compared to the height obtained by the other three data sets. In the 50–80 km altitude range, estimates of mesospheric O3 diurnal variation obtained from the GBMS and the convolved satellite measurements agree well within the ±1 standard deviation (~ 0.6 ppmv) of the GBMS mean profile.
Description:
Published
Description:
D07307
Description:
1.7. Osservazioni di alta e media atmosfera
Description:
1.10. TTC - Telerilevamento
Description:
JCR Journal
Description:
restricted
Keywords:
NDACC microwave
;
03 diurnal variation
;
mesosphere
;
polar ozone
;
01. Atmosphere::01.01. Atmosphere::01.01.01. Composition and Structure
;
01. Atmosphere::01.01. Atmosphere::01.01.04. Processes and Dynamics
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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