GROMOS-C, a novel ground-based microwave radiometer for ozone measurement campaigns
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...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2015-07-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | http://www.atmos-meas-tech.net/8/2649/2015/amt-8-2649-2015.pdf |
| _version_ | 1818151510275522560 |
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| author | S. Fernandez A. Murk N. Kämpfer |
| author_facet | S. Fernandez A. Murk N. Kämpfer |
| author_sort | S. Fernandez |
| collection | DOAJ |
| description | 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.
<br><br>
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.
<br><br>
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.
<br><br>
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. |
| first_indexed | 2024-12-11T13:39:58Z |
| format | Article |
| id | doaj.art-f0a8528f07654ceda0cd093e68d1ec11 |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-11T13:39:58Z |
| publishDate | 2015-07-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-f0a8528f07654ceda0cd093e68d1ec112022-12-22T01:04:50ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482015-07-01872649266210.5194/amt-8-2649-2015GROMOS-C, a novel ground-based microwave radiometer for ozone measurement campaignsS. Fernandez0A. Murk1N. Kämpfer2Institute of Applied Physics, University of Bern, Bern, SwitzerlandInstitute of Applied Physics, University of Bern, Bern, SwitzerlandInstitute of Applied Physics, University of Bern, Bern, SwitzerlandStratospheric 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. <br><br> 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. <br><br> 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. <br><br> 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.http://www.atmos-meas-tech.net/8/2649/2015/amt-8-2649-2015.pdf |
| spellingShingle | S. Fernandez A. Murk N. Kämpfer GROMOS-C, a novel ground-based microwave radiometer for ozone measurement campaigns Atmospheric Measurement Techniques |
| title | GROMOS-C, a novel ground-based microwave radiometer for ozone measurement campaigns |
| title_full | GROMOS-C, a novel ground-based microwave radiometer for ozone measurement campaigns |
| title_fullStr | GROMOS-C, a novel ground-based microwave radiometer for ozone measurement campaigns |
| title_full_unstemmed | GROMOS-C, a novel ground-based microwave radiometer for ozone measurement campaigns |
| title_short | GROMOS-C, a novel ground-based microwave radiometer for ozone measurement campaigns |
| title_sort | gromos c a novel ground based microwave radiometer for ozone measurement campaigns |
| url | http://www.atmos-meas-tech.net/8/2649/2015/amt-8-2649-2015.pdf |
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