Publication details

Multi-year assessment of atmospheric circulation and impacts on air temperature variation on James Ross Island, Antarctic Peninsula

Authors

AMBROŽOVÁ Klára LÁSKA Kamil KAVAN Jan

Year of publication 2020
Type Article in Periodical
Magazine / Source International Journal of Climatology
MU Faculty or unit

Faculty of Science

Citation
Web https://rmets.onlinelibrary.wiley.com/doi/full/10.1002/joc.6285
Doi http://dx.doi.org/10.1002/joc.6285
Keywords Antarctic Peninsula; James Ross Island; air temperature; synoptic climatology; pattern detection
Description The influence of synoptic-scale circulation on air temperature variation in the ice-free areas and glaciated areas on the eastern side of the Antarctic Peninsula have been analysed. For this purpose, a new classification of atmospheric circulation with fifteen synoptic patterns in the Antarctic Peninsula Region was developed using a self-organizing maps technique. The synoptic patterns were compared with air temperature observations from coastal and glacial sites on James Ross Island, north-eastern Antarctic Peninsula, in the period 2005–2015. The most frequent synoptic pattern with a frequency of 13.7 % was dominated by a low-pressure centre in the north-western Bellingshausen Sea, which extended over the Antarctic Peninsula to the Weddell Sea. On the other hand, the largest interannual variability was observed for a synoptic pattern with a low-pressure centre in the southern Bellingshausen Sea. This synoptic pattern also had the highest air temperature anomalies at both investigated sites year-round. Air temperature anomalies at the lower lying site (Mendel station) were the lowest during a high-pressure ridge dominating the AP Region due to a combination of local and synoptic-scale processes. At the glacial site, however, southerly barrier winds advecting cold air from the ice-covered Weddell Sea during a strong low-pressure system in the Weddell Sea ensured the coldest air temperature anomalies.
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