Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa24a..08h&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA24A-08
Physics
0322 Constituent Sources And Sinks, 0340 Middle Atmosphere: Composition And Chemistry, 0341 Middle Atmosphere: Constituent Transport And Chemistry (3334), 3332 Mesospheric Dynamics, 3334 Middle Atmosphere Dynamics (0341, 0342)
Scientific paper
The ozone and temperature measurements from SABER on the TIMED satellite are unique. They provide information from one instrument on a global basis, over the full range of local solar times, from the lower stratosphere into the lower thermosphere, over nearly 5 years. Based on these data, we present new results from 20 to 100 km in altitude and from 48ºS to 48ºN in latitude of a) ozone diurnal variations over 24 hours in local solar time and over an annual cycle, and b) mean (zonal and local time average) variations over an annual cycle. Such comprehensive results covering this range of temporal and spatial variations have not been available before. The diurnal variations provide information on the photochemistry of ozone and effects of transport over a diurnal cycle, which are important from the upper stratosphere into the lower thermosphere. Knowledge of diurnal variations also enables the estimation of realistic zonal means (averages over longitude and local time in a consistent manner), which provide the opportunity to better study the relative effects of dynamics and chemistry. Our estimates show the rapid decrease in ozone near sunrise with slower and smaller variations during the day, and the large increase at dusk. The diurnal variations can cover more than an order of magnitude at higher altitudes, and show significant variations with both altitude and with day of year. The mean values show significant semiannual and annual variations, with the semiannual amplitudes being especially large at higher altitudes. The semiannual variations are mostly symmetric with respect to the Equator, while the annual variations are more anti-symmetric. Qualitatively, our results show that the mean ozone values are positively correlated to those of the temperature above 80 km, and mostly anti-correlated with temperature between about 35 and 80 km. We compare with results from the MLS and HRDI instruments on UARS, from the solar mesosphere explorer (SME) satellite, from selected space shuttle experiments, and from ground-based measurements. We can only compare piecemeal with previous measurements, because these are generally more limited in temporal and spatial coverage. However, the comparisons are very encouraging, and they provide further confidence in the more comprehensive results from the SABER ozone and temperature measurements on TIMED.
Huang Fang
Mayr Hans
Mengel J. J.
Mlynczak M. M.
Reber Carl
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