SEASONAL VARIATIONS OF THE VERTICAL TRANSPORT OF CO2 IN THE MLT REGION

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CORNELIUS CSAR JUDE H. SALINAS1, LOREN CHANG2, MAO-CHANG LIANG1,3, JIA YUE4 and JAMES RUSSEL III4

1Taiwan International Graduate Program V Earth Systems Science, Academia Sinica, Taipei City, Taiwan (R.O.C.)

2Graduate Institute of Space Science, National Central University, Zhongli City, Taiwan (R.O.C.)

 3Research Center for Environmental Change, Academia Sinica, Taipei City, Taiwan (R.O.C.)

4Hampton University, Hampton, Virginia, USA

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Abstract

In the middle atmosphere, a complete understanding of the variations of carbon dioxide only requires the knowledge of its transport because it is chemically inert. Unfortunately though, its variations and hence its modeling in the MLT region is poorly known. The struggles in modeling CO2 has been traced into eddy diffusion coefficient problems. Knowing and modeling these variations not only aids us in our knowledge of the radiative forcings of CO2 in the MLT Region; it actually also gives us a better idea of the dynamical variations in the MLT region and aids us in modeling the effects of the lower atmosphere on the upper atmosphere. This work aims to address these problems by first; presenting and modeling the observed seasonal spatio-temporal variations of CO2 in the MLT region using SABER/TIMED observations and the 1D JPL/CalTech Model. From the modeling, we estimate eddy diffusion coefficients, the vertical flux and species-independent transport time-scales behind the vertical transport of CO2. The struggles in modeling CO2 has been traced into eddy diffusion coefficient problems. This species-independent transport time-scale allows us to determine the regions of the atmosphere where a given chemical species is effectively transported by mass circulations.