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@ARTICLE{Swenson:902572,
      author       = {Swenson, G. R. and Vargas, F. and Jones, M. and Zhu, Yu and
                      Kaufmann, M. and Yee, J. H. and Mlynczak, M.},
      title        = {{I}ntra‐annual {V}ariation of {E}ddy {D}iffusion (k zz )
                      in the {MLT}, from {SABER} and {SCIAMACHY} {A}tomic {O}xygen
                      {C}limatologies},
      journal      = {Journal of geophysical research / D},
      volume       = {126},
      number       = {23},
      issn         = {0148-0227},
      address      = {Hoboken, NJ},
      publisher    = {Wiley},
      reportid     = {FZJ-2021-04371},
      pages        = {e2021JD035343},
      year         = {2021},
      abstract     = {Atomic oxygen (O) in the mesosphere and lower thermosphere
                      (MLT) results from a balance between production via
                      photo-dissociation in the lower thermosphere and chemical
                      loss by recombination in the upper mesosphere. The transport
                      of O downward from the lower thermosphere into the
                      mesosphere is preferentially driven by the eddy diffusion
                      process that results from dissipating gravity waves and
                      instabilities. The motivation here is to probe the
                      intra-annual variability of the eddy diffusion coefficient
                      (kzz) and eddy velocity in the MLT based on the climatology
                      of the region, initially accomplished by Garcia and Solomon
                      (1985, https://doi.org/10.1029/JD090iD02p03850). In the
                      current study, the intra-annual cycle was divided into 26
                      two-week periods for each of three zones: the northern
                      hemisphere (NH), southern hemisphere (SH), and equatorial
                      (EQ). Both 16 years of SABER (2002–2018) and 10 years of
                      SCIAMACHY (2002–2012) O density measurements, along with
                      NRLMSIS® 2.0 were used for calculation of atomic oxygen
                      eddy diffusion velocities and fluxes. Our prominent findings
                      include a dominant annual oscillation below 87 km in the NH
                      and SH zones, with a factor of 3–4 variation between
                      winter and summer at 83 km, and a dominant semiannual
                      oscillation at all altitudes in the EQ zone. The measured
                      global average kzz at 96 km lacks the intra-annual
                      variability of upper atmosphere density data deduced by Qian
                      et al. (2009, https://doi.org/10.1029/2008JA013643). The
                      very large seasonal (and hemispherical) variations in kzz
                      and O densities are important to separate and isolate in
                      satellite analysis and to incorporate in MLT models.},
      cin          = {IEK-7},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-7-20101013},
      pnm          = {2112 - Climate Feedbacks (POF4-211)},
      pid          = {G:(DE-HGF)POF4-2112},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000729996000026},
      doi          = {10.1029/2021JD035343},
      url          = {https://juser.fz-juelich.de/record/902572},
}