The relationship between atmospheric blocking and temperature anomalies in Turkey between 1977 and 2016

Bahtiyar Efe*, İsmail Sezen, Anthony R. Lupo, Ali Deniz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

The relationship between the character of atmospheric blocking and surface temperature has not been studied in depth for Turkey. Here, these relationships are investigated for the period 1977–2016. The seasonal mean temperature anomalies for all stations during blocked days varies between −2.1 and 0.8°C. There are four main patterns representing the mean seasonal temperature anomalies for all stations during blocked and non-blocked days. The annual cycle for each group is nearly opposite, and this indicates the impact of blocking on observed temperature, as blocked days comprised 30% of the study period. When focusing on the spatial distribution of mean seasonal anomalies, the winter and fall seasons show that, almost all stations have negative temperature anomalies although anomalies are close to zero during warm seasons (spring and summer). The composite analysis shows that the western part of the country is strongly affected by cold air advection during upstream blocking events and the eastern part of the country is affected by warm temperature advection for downstream blocking events. There is a statistically significant (95% confidence level) negative correlation between blocking intensity and temperature anomalies in all seasons except spring. There is no relationship between both blocking duration and longitudinal extent and the seasonal mean temperature anomaly except during winter, which has a significant negative correlation. The temperature anomaly distribution stratified by season shows that strong positive anomalies are rarely observed in all seasons. Only winter and spring were associated with very strong positive anomalies and only at a few stations. Rex-type atmospheric blocking events are observed during the period of not only the maximum temperature anomaly but also for minimum anomalies. However, the location of the blocking event differed from the typical situation above, with the cold and warm events being located downstream and upstream of Turkey, respectively.

Original languageEnglish
Pages (from-to)1022-1037
Number of pages16
JournalInternational Journal of Climatology
Volume40
Issue number2
DOIs
Publication statusPublished - 1 Feb 2020

Bibliographical note

Publisher Copyright:
© 2019 Royal Meteorological Society

Funding

The authors would like to thank the anonymous reviewers for their time and effort in making this work a stronger contribution. We would also like to thank Prof. Christopher Wikle, Department of Statistics at the University of Missouri, for his valuable comments regarding our statistical testing. This work is funded by Turkish Science Foundation (TUBITAK) with the grant number 1059B141700588.

FundersFunder number
TUBITAK1059B141700588
Turkish Science Foundation

    Keywords

    • Turkey
    • atmospheric blocking
    • climatic seasons
    • temperature anomalies

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