Dyrland, M.E. and Hall, C.M. and Mulligan, F.J. and Tsutsumi, M. and Sigernes, F.
Improved estimates for neutral air temperatures at 90 km and
78°N using satellite and meteor radar data.
Radio Science, 45 (4006).
A technique for using satellite‐derived temperatures to calibrate initial estimates of
90 km temperatures measured by meteor wind radar is presented. Temperatures derived
from the Nippon/Norway Svalbard Meteor Radar, situated on Svalbard at 78°N, 16°E, are
calibrated using data from the Aura spacecraft’s Microwave Limb Sounder (MLS)
experiment. The calibration was performed in a two‐step process: after an initial calibration
of first‐guess temperatures, results were used to adjust the MLS values to reflect daily
means rather than the 0200–1100 UT observation period of the satellite instrument;
thereafter the calibration was repeated with the revised MLS temperatures. The resulting
temperature time series represents a marked improvement on earlier results calibrated
using hydroxyl emission and potassium/K‐Lidar observations, as the uncertainty is
reduced from 17 to 7 K. These latest results represent a new step toward reliable and
continual monitoring of upper mesosphere/lower thermosphere temperature.
||An edited version of this paper was published by AGU. Copyright (2010) American Geophysical Union. Acknowledgments: The satellite data used in this study were
acquired as part of the activities of the NASA Earth‐Sun System Division,
and are archived and distributed by the Goddard Earth Sciences
(GES) Data and Information Services Center (DISC). We are highly
appreciative of the NASA EOS Aura MLS and NASA TIMED SABER
teams for providing free access to the data. We are also grateful to
Chuck Deehr at the Geophysical Institute, University of Alaska Fairbanks,
and Takehiko Aso, National Institute of Polar Research, Tokyo,
for their initiatives for putting the ground‐based instruments in Svalbard
and for sharing the data. We would also like to thank the two anonymous
reviewers for their valuable input.
||neutral air temperatures; satellite; meteor radar data; 90 km temperatures; Nippon/Norway Svalbard Meteor Radar; Microwave Limb Sounder; MLS;
||Faculty of Science and Engineering > Experimental Physics
Dr. Frank Mulligan
||08 Sep 2011 08:15
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