 |
| Titel |
GROMOS-C, a novel ground-based microwave radiometer for ozone measurement campaigns |
| VerfasserIn |
S. Fernandez, A. Murk, N. Kämpfer |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 7 ; Nr. 8, no. 7 (2015-07-02), S.2649-2662 |
| Datensatznummer |
250116471
|
| Publikation (Nr.) |
 copernicus.org/amt-8-2649-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
Stratospheric ozone is of major interest as it absorbs most harmful UV
radiation from the sun, allowing life on Earth. Ground-based microwave remote
sensing is the only method that allows for the measurement of ozone profiles up to the
mesopause, over 24 hours and under different weather conditions with high time
resolution.
In this paper a novel ground-based microwave radiometer is presented. It is
called GROMOS-C (GRound based Ozone MOnitoring System for Campaigns), and it
has been designed to measure the vertical profile of ozone distribution in
the middle atmosphere by observing ozone emission spectra at a frequency of
110.836 GHz. The instrument is designed in a compact way which makes it
transportable and suitable for outdoor use in campaigns, an advantageous
feature that is lacking in present day ozone radiometers. It is operated
through remote control.
GROMOS-C is a total power radiometer which uses a pre-amplified heterodyne
receiver, and a digital fast Fourier transform spectrometer for the spectral
analysis. Among its main new features, the incorporation of
different calibration loads stands out; this includes a noise diode and a new type of
blackbody target specifically designed for this instrument, based on Peltier
elements. The calibration scheme does not depend on the use of liquid
nitrogen; therefore GROMOS-C can be operated at remote places with no
maintenance requirements. In addition, the instrument can be switched in
frequency to observe the CO line at 115 GHz.
A description of the main characteristics of GROMOS-C is included in this
paper, as well as the results of a first campaign at the High Altitude
Research Station at Jungfraujoch (HFSJ), Switzerland. The validation is
performed by comparison of the retrieved profiles against equivalent profiles
from MLS (Microwave Limb Sounding) satellite data, ECMWF (European
Centre for Medium-Range Weather Forecast) model data, as well as our nearby NDACC (Network for the Detection of
Atmospheric Composition Change) ozone
radiometer measuring at Bern. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|