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Structural changes in long-term trends of the dynamics of the upper atmosphere


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To clarify the role of different sources in MLT long-term trends, time series of middle atmosphere winds are investigated with respect to structural changes in long-term trends. These analyses are complemented by comparison with variations and trends of troposphere-stratosphere parameters related to dynamics, ozone behaviour, lower ionospheric parameters, and external influence as solar flux, geomagnetic field and cosmic ray flux variations. Numerical modelling of the middle atmosphere response to lower atmosphere changes is performed using the MUAM model of the middle atmosphere. Time slice runs based upon reanalysis data are used to clarify the influence of the lower atmosphere on middle atmosphere trends. 

Collm winds
Collm radar June-August mean winds. 1979-07/2004: LF; 08/2004-date: MR.



Cooperation partners:
RSHU St. Petersburg
IEM Obninsk
IAP Kühlungsborn
ISAS Saskatoon
Institute of Atmospheric Physics, Czech Academy of Sciences


Publications related to the project:

Jacobi, Ch., A. Krug und E. Merzlyakov, 2017: Radar observations of the quarterdiurnal tide at midlatitudes: Seasonal and long-term variations, J. Atmos. Sol.-Terr. Phys., in press, doi: 10.1016/j.jastp.2017.05.014.

Jacobi, Ch., F. Lilienthal, C. Geißler, and A. Krug, 2015: Long-term variability of mid-latitude mesosphere-lower thermosphere winds over Collm (51°N, 13°E), J. Atmos. Sol.-Terr. Phys., 136, B, 174–186, doi:10.1016/j.jastp.2015.05.006.

Merzlyakov, E.G., Ch. Jacobi, and T.V.Solovjova, 2015: The year-to-year variability of the autumn transition dates in the mesosphere/lower thermosphere wind regime and its coupling with the dynamics of the stratosphere and troposphere, J. Atmos. Sol.-Terr. Phys., 122, 9-17, doi:10.1016/j.jastp.2014.11.002.

Jacobi, Ch., 2014: Long-term trends and decadal variability of upper mesosphere/lower thermosphere gravity waves at midlatitudes, J. Atmos. Sol.-Terr. Phys., 118, Part A, 90-95, doi:10.1016/j.jastp.2013.05.009.

Jacobi, Ch., 2012: Long-term trends and decadal variability of upper mesosphere/lower thermosphere gravity waves at midlatitudes, Rep. Inst. Meteorol. Univ. Leipzig, 48, 25-33. (pdf)

Jacobi, Ch., P. Hoffmann, R.Q. Liu, E.G. Merzlyakov, Yu.I. Portnyagin, A.H. Manson, and C.E. Meek, 2012: Long-term trends, their changes, and interannual variability of Northern Hemisphere midlatitude MLT winds. J. Atmos. Solar-Terr. Phys., 75-76, 81-91, doi:10.1016/j.jastp.2011.03.016.

Liu, R.Q., Ch. Jacobi, P. Hoffmann, G. Stober, and E. G. Merzlyakov, 2010: A piecewise linear model for detecting climatic trends and their structural changes with application to mesosphere/lower thermosphere winds over Collm, Germany. J. Geophys. Res., 115, D22105, doi:10.1029/2010JD014080.

Jacobi, Ch., E. G. Merzlyakov, R. Q. Liu, T. V. Solovjova, and Y. I. Portnyagin, 2010: Structural changes in lower ionosphere wind trends at midlatitudes. Adv. Radio Sci., 231-236.

Laštovička, J., 2009: Global pattern of trends in the upper atmosphere and ionosphere: Recent progress. J. Atmos. Solar-Terr. Phys., 71, 1514-1528.

Jacobi, Ch., P. Hoffmann, R.Q. Liu, P. Križan, J. Laštovička, E.G. Merzlyakov, T.V. Solovjova, and Yu.I. Portnyagin, 2009: Midlatitude mesopause region winds and waves and comparison with stratospheric variability. J. Atmos. Solar-Terr. Phys., 71, 1540-1546.

Merzlyakov, E.G., Ch. Jacobi, Yu.I. Portnyagin, and T.V. Solovjova, 2009: Structural changes in trend parameters of the MLT winds based on wind measurements at Obninsk (55°N, 37°E) and Collm (52°N, 15°E). J. Atmos. Solar-Terr. Phys., 71, 1547-1557.

Jacobi, Ch., 2008: Low-frequency lower E region wind and reflection height measurements as sensor for climate variability. Adv. Radio Sci. 6, 331-335.

Jacobi, Ch., P. Hoffmann, and D. Kürschner, 2008: Trends in MLT region winds and planetary waves, Collm (52°N, 15°E). Ann. Geophysicae 26, 1221-1232.


Last update 15 June 2017 by Ch. Jacobi