UNIDEF   23986
UNIDAD DE INVESTIGACION Y DESARROLLO ESTRATEGICO PARA LA DEFENSA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
A new millimeter wave radiometer installed in the NDACC site of Río Gallegos, Argentina
Autor/es:
MIZUNO, A., T. NAGAHAMA, Y. KOJIMA, R. TANADA, T. KUWAHARA, A. MORIHIRA, , H. NAKANE ; J. SALVADOR, P. F. ORTE, E. WOLFRAM, R. DELIA, E. QUEL
Lugar:
Isla de La Reunión
Reunión:
Simposio; 2011 NDACC Symposium; 2011
Institución organizadora:
Université de la Reunion
Resumen:
With the
aim of contribution to the study of atmospheric ozone layer, a new sensitive radiometer
for atmospheric minor constituents has been installed in the Observatorio
Atmosférico de la Patagonia Austral, División LIDAR, CEILAP (CITEDEF-CONICET),
in October 2010. This observatory is established in the city of Río Gallegos
(51º 36 S, 69º 19 W) Argentina, close to the spring ozone hole. The
millimeter wave radiometer (MWR) was developed in STEL (Solar Terrestrial
Environment Laboratory), Nagoya University, Japan. This passive remote sensing
instrument is able to measure the ozone (O3) amount in the high
stratosphere and mesosphere continuously and automatically with a high time
resolution each thirty minutes. The ozone profiles from MWR will be
supplemented with the ozone profiles obtained from the DIAL system existent in
the observatory as part NDACC.
Its based
on the spectral signal detection from the atmosphere due to the molecular
rotational transition of molecules under study. The operation is based on a
superheterodyne system which uses a Superconductor-Insulator-Superconductor
(SIS) mixer receiver operating at 203.6GHz. The SIS mixer junction consists of
a sandwich structure of Nb/AlOx/Nb, and is cooled to 4.2K with a closed cycle
He-gas refrigerator. Two additional heterodyne-mixed stages are realized with
the objetive to shift the measured spectral line until a frequency around of
500 MHz. A FFT (Fast Fourier Transform) spectrometer system is used as a back
end. The aims of this work are to show the potential of the millimeter wave
radiometer installed in the subpolar latitudes close to the polar ozone hole
and to present the preliminary result of the first measurements.