Non-zonal Structures of Mesosphere/lower Thermosphere Dynamics at Middle Latitudes (NOSTHEM)

• Applicant: Professor Dr. Christoph Jacobi
• Subject Area: Atmospheric Science
• Term: from 2017 to 2022
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 389210623

• Final Report Year: 2023

Final Report Abstract

NOSTHEM is a joint project by the Leipzig Institute for Meteorology (LIM), Leipzig University, and Kazan Federal University, Russian Federation, jointly funded by DFG and RFBR. The project made use of observations with two very similar VHF meteor radars (MRs) at similar latitude, but with a 36° difference in longitude, namely the MR at Collm (53°N, 13°E) and the newly installed MR at Kazan (56°N, 49°E), in order to specify the influence of non-zonal structures on mean circulation, waves and tides in the mesosphere/lower thermosphere (MLT). This allowed to estimate the uncertainty of mean climatology and variability observed at single sites in terms of their representativeness for zonal mean values. The analyzed parameters were horizontal winds and temperatures derived from MR, together with winds, geopotential heights and temperatures from satellites. Regular seasonal changes in the difference between the wind parameters at the two sites are owing to ststionay planetary waves (SPWs), especially in winter, but the latitudinal difference in the zonal and meridional flow mean, even for only 5 degree of latitudinal difference, also contributes to a mean difference. Additional MR observations at different longitudes from an extended winter campaign could be used to analyze planetary waves and tidal variability in comparison with the satellite results.

Publications

• Implementing a whole atmosphere gravity wave parameterization in the Middle and Upper Atmosphere Model: preliminary results. Rep. Inst. Meteorol. Univ. Leipzig, 57 (59-70). (2019)
  Lilienthal, F., N. Samtleben, C. Jacobi & E. Yigit
  
• Longitudinal MLT wind structure at higher mid-latitudes as seen by meteor radars at central and Eastern Europe (13°E/49°E). Advances in Space Research, 63(10), 3154-3166.
  Korotyshkin, Dmitriy; Merzlyakov, Eugeny; Jacobi, Christoph; Lilienthal, Friederike & Wu, Qian
  
• Mesosphere/lower thermosphere winds measured with nearby SKiYMET meteor radars at Collm and Juliusruh, and comparison with Kazan winds. Kleinheubach Conference 2019.
  Jacobi, Ch., F. Lilienthal, G. Stober, D. Korotyshkin & E. Merzlyakov
  
• Trend analyses of solar tides in the middle atmosphere. Rep. Inst. Meteorol. Univ. Leipzig, 57, 85 –96. (2019)
  Löffelmann, J., F. Lilienthal & Ch. Jacobi
  
• Amplitude modulation of the semidiurnal tide based on MLT wind measurements with a European/Siberian meteor radar network in October – December 2017. Advances in Space Research, 66(3), 631-645.
  Merzlyakov, E.; Solovyova, T.; Yudakov, A.; Korotyshkin, D.; Jacobi, Ch. & Lilienthal, F.
  
• Some features of the day-to-day MLT wind variability in winter 2017–2018 as seen with a European/Siberian meteor radar network. Advances in Space Research, 65(6), 1529-1543.
  Merzlyakov, E.; Solovyova, T.; Yudakov, A.; Korotyshkin, D.; Jacobi, Ch. & Lilienthal, F.
  
• Variability of Gravity Wave Effects on the Zonal Mean Circulation and Migrating Terdiurnal Tide as Studied With the Middle and Upper Atmosphere Model (MUAM2019) Using a Nonlinear Gravity Wave Scheme. Frontiers in Astronomy and Space Sciences, 7.
  Lilienthal, Friederike; Yiğit, Erdal; Samtleben, Nadja & Jacobi, Christoph
  
• Influence of geomagnetic disturbances on mean winds and tides in the mesosphere/lower thermosphere at midlatitudes. Advances in Radio Science, 19, 185-193.
  Jacobi, Christoph; Lilienthal, Friederike; Korotyshkin, Dmitry; Merzlyakov, Evgeny & Stober, Gunter
  
• Long-period meteor radar temperature variations over Collm (51°N, 13°E) and Kazan (56°N, 49°E). Advances in Space Research, 67(10), 3250-3259.
  Merzlyakov, E.; Korotyshkin, D.; Jacobi, Ch. & Lilienthal, F.
  
• Migrating and nonmigrating tidal signatures in sporadic E occurrence rates. 2021 Kleinheubach Conference, 1-3. IEEE.
  Jacobi, Christoph; Lilienthal, Friederike; Kandieva, Kanykei; Yamazaki, Yosuke; Sobhkhiz-Miandehi, Sahar & Arras, Christina
  
• Radar observations of geomagnetic disturbance effects on midlatitude mesosphere/lower thermosphere dynamics. Rep. Inst. Meteorol. Univ. Leipzig, 59, 1 –11. (2021c)
  Jacobi, Ch., F. Lilienthal, D. Korotyshkini, E. Merzlyakov & G. Stober
  
• The sensitivity of the MUAM model to the variability of non-orographic gravity wave distributions. Rep. Inst. Meteorol. Univ. Leipzig, 60, 65 –77
  Kandieva, K., Ch. Jacobi, P. Pogoreltsev & E. Merzlyakov
  
• Migrating and nonmigrating tidal signatures in sporadic E layer occurrence rates. Advances in Radio Science, 20, 85-92.
  Jacobi, Christoph; Kandieva, Kanykei & Arras, Christina