Daily to intraseasonal oscillations at Antarctic research station Neumayer

Abstract High temporal resolution (three hours) records of temperature, wind speed and sea level pressure recorded at Antarctic research station Neumayer (70°S, 8°W) during 1982–2011 are analysed to identify oscillations from daily to intraseasonal timescales. The diurnal cycle dominates the three-h...

Full description

Bibliographic Details
Published in:Antarctic Science
Main Authors: Rimbu, N., Lohmann, G., König-Langlo, G., Necula, C., Ionita, M.
Format: Article in Journal/Newspaper
Language:English
Published: Cambridge University Press (CUP) 2013
Subjects:
Geology
Ecology, Evolution, Behavior and Systematics
Oceanography
Antarctic
The Antarctic
Neumayer
Antarc*
Antarctic Science
Online Access:http://dx.doi.org/10.1017/s0954102013000540
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102013000540
Description
Summary:Abstract High temporal resolution (three hours) records of temperature, wind speed and sea level pressure recorded at Antarctic research station Neumayer (70°S, 8°W) during 1982–2011 are analysed to identify oscillations from daily to intraseasonal timescales. The diurnal cycle dominates the three-hourly time series of temperature during the Antarctic summer and is almost absent during winter. In contrast, the three-hourly time series of wind speed and sea level pressure show a weak diurnal cycle. The dominant pattern of the intraseasonal variability of these quantities, which captures the out-of-phase variation of temperature and wind speed with sea level pressure, shows enhanced variability at timescales of ∼ 40 days and ∼ 80 days, respectively. Correlation and composite analysis reveal that these oscillations may be related to tropical intraseasonal oscillations via large-scale eastward propagating atmospheric circulation wave-trains. The second pattern of intraseasonal variability, which captures in-phase variations of temperature, wind and sea level pressure, shows enhanced variability at timescales of ∼ 35, ∼ 60 and ∼ 120 days. These oscillations are attributed to the Southern Annular Mode/Antarctic Oscillation (SAM/AAO) which shows enhanced variability at these timescales. We argue that intraseasonal oscillations of tropical climate and SAM/AAO are related to distinct patterns of climate variables measured at Neumayer.

Similar Items