Comparison of ground-based and satellite measurements of atmospheric temperature in the mesopause region in high-latitude eastern Siberia |
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Authors: | G A Gavrilyeva P P Ammosov I I Koltovskoi |
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Institution: | (1) Center for Atmospheric and Space Science, Utah State University, Logan, UT, USA;(2) Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, USA;(3) Computational Physics Inc., Boulder, CO, USA;(4) Electrical & Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA;(5) Center for Atmospheric Sciences, Hampton University, Hampton, VA, USA;(6) Department of Meteorology, Stockholm University, Stockholm, Sweden |
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Abstract: | The mesopause kinetic temperature at an altitude of 87 km measured with a SABER broadband radiometer installed on the TIMED
satellite and the hydroxyl molecule rotational temperature measured with a ground-spectrograph installed in high-latitude
eastern Siberia (Maimaga optical station; φ = 63°N, λ = 129.5°E) are compared. The data of the observations performed from
2002 to 2006 have been analyzed. The temperatures measured during the satellite passes at distances not larger than 300 km
from the intersection of the spectrograph sighting line with the hydroxyl emitting layer (∼87 km) have been compared. An analysis
of 130 cases of coincident measurements indicated that the average hydroxyl molecule rotational temperatures are systematically
lower than the average kinetic temperature at an altitude of the hydroxyl layer measured with SABER by 4.4 K (with a standard
deviation of 11.4 K). A seasonal dependence is observed regarding the difference between the ground-based and satellite measurements.
The difference decreases from 10 K in January to zero towards March. However, the time variations in the temperature obtained
with the ground-based device and on the satellite are similar. Based on the performed analysis, it has been concluded that
a series of hydroxyl rotational temperatures can be used to study temperature variations on different time scales, including
long-term trends at the temperature emission altitude (∼87 km). |
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