Inter‐annual and inter‐decadal variability modes of the Athens total cloud cover
The historical observations of the total cloud cover (TCC) index since 1900 from the National Observatory of Athens archives were used here, in order to investigate the inter‐annual variability of TCC. Multi‐spectral decomposition analysis was applied in order to resolve statistically significant mo...
Published in: | International Journal of Climatology |
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crwiley:10.1002/joc.5687 2024-06-02T08:11:20+00:00 Inter‐annual and inter‐decadal variability modes of the Athens total cloud cover Kalimeris, Anastasios Founda, Dimitra 2018 http://dx.doi.org/10.1002/joc.5687 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.5687 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.5687 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 38, issue 13, page 4667-4686 ISSN 0899-8418 1097-0088 journal-article 2018 crwiley https://doi.org/10.1002/joc.5687 2024-05-03T11:54:39Z The historical observations of the total cloud cover (TCC) index since 1900 from the National Observatory of Athens archives were used here, in order to investigate the inter‐annual variability of TCC. Multi‐spectral decomposition analysis was applied in order to resolve statistically significant modes of TCC variability out of the estimated stochastic variations. An increase of the Athens TCC (A‐TCC) was ascertained during the observational period (1900–2012). The observed A‐TCC variability was found to be composed by “a dominant nonlinear trend” that represents the centennial increment of the cloud cover, and “a small number of sub‐decadal oscillatory modes,” particularly in the winter series. Additionally, the evolutionary history of the A‐TCC variability involves a significant regime shift in about 1960 that was followed by an increase on the mean TCC level and an enhancement of the positive TCC trends apart from winter, in which the trend was faded out. The influence of global and hemispheric climatic variability patterns on the observed A‐TCC changes was explored in the timescale domain along with the impacts of the Mediterranean evaporation field. Results showed that the A‐TCC inter‐decadal variability is strongly coupled with the Atlantic Multidecadal Oscillation (AMO) and the Mediterranean evaporation during all seasons, except winter, in which the atmospheric dynamic drives decadal and sub‐decadal TCC variations, primarily modulated by the North Atlantic Oscillation (NAO). During the hot season, the AMO and the Mediterranean Sea thermodynamic processes become major regulators of the A‐TCC variability, particularly on the inter‐decadal scales, but the tropospheric North Atlantic activity still affects the A‐TCC through the summer NAO (SNAO) pattern. In this framework, different epochs were discerned in the relation of the A‐TCC with the Mediterranean evaporation field, which seem to be associated with the prevalence either of sea thermodynamic processes or of the atmospheric dynamics. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Wiley Online Library International Journal of Climatology 38 13 4667 4686 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
The historical observations of the total cloud cover (TCC) index since 1900 from the National Observatory of Athens archives were used here, in order to investigate the inter‐annual variability of TCC. Multi‐spectral decomposition analysis was applied in order to resolve statistically significant modes of TCC variability out of the estimated stochastic variations. An increase of the Athens TCC (A‐TCC) was ascertained during the observational period (1900–2012). The observed A‐TCC variability was found to be composed by “a dominant nonlinear trend” that represents the centennial increment of the cloud cover, and “a small number of sub‐decadal oscillatory modes,” particularly in the winter series. Additionally, the evolutionary history of the A‐TCC variability involves a significant regime shift in about 1960 that was followed by an increase on the mean TCC level and an enhancement of the positive TCC trends apart from winter, in which the trend was faded out. The influence of global and hemispheric climatic variability patterns on the observed A‐TCC changes was explored in the timescale domain along with the impacts of the Mediterranean evaporation field. Results showed that the A‐TCC inter‐decadal variability is strongly coupled with the Atlantic Multidecadal Oscillation (AMO) and the Mediterranean evaporation during all seasons, except winter, in which the atmospheric dynamic drives decadal and sub‐decadal TCC variations, primarily modulated by the North Atlantic Oscillation (NAO). During the hot season, the AMO and the Mediterranean Sea thermodynamic processes become major regulators of the A‐TCC variability, particularly on the inter‐decadal scales, but the tropospheric North Atlantic activity still affects the A‐TCC through the summer NAO (SNAO) pattern. In this framework, different epochs were discerned in the relation of the A‐TCC with the Mediterranean evaporation field, which seem to be associated with the prevalence either of sea thermodynamic processes or of the atmospheric dynamics. |
format |
Article in Journal/Newspaper |
author |
Kalimeris, Anastasios Founda, Dimitra |
spellingShingle |
Kalimeris, Anastasios Founda, Dimitra Inter‐annual and inter‐decadal variability modes of the Athens total cloud cover |
author_facet |
Kalimeris, Anastasios Founda, Dimitra |
author_sort |
Kalimeris, Anastasios |
title |
Inter‐annual and inter‐decadal variability modes of the Athens total cloud cover |
title_short |
Inter‐annual and inter‐decadal variability modes of the Athens total cloud cover |
title_full |
Inter‐annual and inter‐decadal variability modes of the Athens total cloud cover |
title_fullStr |
Inter‐annual and inter‐decadal variability modes of the Athens total cloud cover |
title_full_unstemmed |
Inter‐annual and inter‐decadal variability modes of the Athens total cloud cover |
title_sort |
inter‐annual and inter‐decadal variability modes of the athens total cloud cover |
publisher |
Wiley |
publishDate |
2018 |
url |
http://dx.doi.org/10.1002/joc.5687 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.5687 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.5687 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
International Journal of Climatology volume 38, issue 13, page 4667-4686 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.5687 |
container_title |
International Journal of Climatology |
container_volume |
38 |
container_issue |
13 |
container_start_page |
4667 |
op_container_end_page |
4686 |
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1800757437330882560 |