On forced and free atmospheric oscillations near the 27-day periodicity

Schanz, Ansgar Ulrich; Hocke, Klemens; Kämpfer, Niklaus (2016). On forced and free atmospheric oscillations near the 27-day periodicity. Earth, Planets and Space, 68(1) Springer 10.1186/s40623-016-0460-y

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The Whole Atmosphere Community Climate Model was used to investigate the influences of solar fluctuations on zonal wind oscillations. Two simulations were conducted with short-term solar forcing (<35 days) on and off. We found that a 27-day wave is an inherent feature of the atmosphere when the short-term solar forcing is inactive. This internal 27-day oscillation comes along with other periods of the extra-long period wave band (20–40 days) and cannot be linked to the Sun’s rotation period. When the short-term solar variability is part of the forcing, including the solar 27-day periodicity, it affects a wide range of the spectrum of zonal wind. At mid-latitudes, a 10-day wave emerges by the short-term solar forcing, which suggests that indirect and nonlinear interactions are involved. Solar short-term variability seems to generate atmospheric perturbations that interact with modes of the internal wave spectrum or the background mean flow. A robust and clear solar interpretation of these wind oscillations is challenging. However, dynamical responses to short-term solar variability exist and need further investigation.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Applied Physics
08 Faculty of Science > Institute of Applied Physics > Microwaves

UniBE Contributor:

Schanz, Ansgar Ulrich; Hocke, Klemens and Kämpfer, Niklaus

Subjects:

600 Technology > 620 Engineering
500 Science
500 Science > 530 Physics

ISSN:

1880-5981

Publisher:

Springer

Language:

English

Submitter:

Simone Corry

Date Deposited:

13 Jul 2017 09:03

Last Modified:

16 Jul 2017 02:14

Publisher DOI:

10.1186/s40623-016-0460-y

BORIS DOI:

10.7892/boris.96961

URI:

https://boris.unibe.ch/id/eprint/96961

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