Title Stability of temperatures from TIMED/SABER v1.07 (2002-2009) and Aura/MLS v2.2 (2004-2009) compared with OH(6-2) temperatures observed at Davis Station, Antarctica
Author French, W.J.R.; Mulligan, F.J.
Author Affil French, W.J.R., Australian Antarctic Division, Kingston, Tasmania, Australia. Other: National University of Ireland Maynooth, Ireland
Source Atmospheric Chemistry and Physics, 10(23), p.11439-11446, . Publisher: Copernicus, Katlenburg-Lindau, International. ISSN: 1680-7316
Publication Date 2010
Notes In English. Includes supplement, http://www.atmos-chem- phys.net/10/11439/2010/acp-10-11439-2010- supplemen t.pdf; published in Atmospheric Chemistry and Physics Discussions: 10 September 2010, http://www.atmos-chem-phys- discuss.net/10/21547/2010/acpd-10-21547-2010. html; accessed in June, 2011. 24 refs. Ant. Acc. No: 91496. GeoRef Acc. No: 309977
Index Terms accuracy; atmospheric pressure; measurement; remote sensing; statistical analysis; temperature; Antarctica; Davis Station; ground-surface temperature; hydroxyl ion; satellite methods; Sounding of the Atmosphere by Broadband Emission Radiometry; spatial distribution; standard deviation; temporal distribution; Thermosphere Ionosphere Mesosphere Electrodynamics
Abstract Temperature profiles from two satellite instruments -- TIMED/SABER and Aura/MLS -- have been used to calculate hydroxyl-layer equivalent temperatures for comparison with values measured from OH(6-2) emission lines observed by a ground-based spectrometer located at Davis Station, Antarctica (68S, 78E). The profile selection criteria -- miss-distance 500 km from the ground station and solar zenith angles 97 -- yielded a total of 2359 SABER profiles over 8 years (2002-2009) and 7407 MLS profiles over 5.5 years (2004-2009). The availability of simultaneous OH volume emission rate (VER) profiles from the SABER (OH-B channel) enabled an assessment of the impact of several different weighting functions in the calculation of OH-equivalent temperatures. The maximum difference between all derived hydroxyl layer equivalent temperatures was less than 3 K. Restricting the miss-distance and miss-time criteria showed little effect on the bias, suggesting that the OH layer is relatively uniform over the spatial and temporal scales considered. However, a significant trend was found in the bias between SABER and Davis OH of ~0.7 K/year over the 8-year period with SABER becoming warmer compared with the Davis OH temperatures. In contrast, Aura/MLS exhibited a cold bias of 9.9 0.4 K compared with Davis OH, but importantly, the bias remained constant over the 2004-2009 year period examined. The difference in bias behaviour of the two satellites has significant implications for multi-annual and long-term studies using their data.
URL http://www.atmos-chem-phys.net/10/11439/2010/acp-10-11439-2010.pdf
Publication Type journal article
Record ID 65006875