A comparison of two methods for detecting abrupt changes in the variance of climatic time series
Two methods for detecting abrupt shifts in the variance – Integrated Cumulative Sum of Squares (ICSS) and Sequential Regime Shift Detector (SRSD) – have been compared on both synthetic and observed time series. In Monte Carlo experiments, SRSD outperformed ICSS in the overwhelming majority of the mo...
Published in: | Advances in Statistical Climatology, Meteorology and Oceanography |
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ftcopernicus:oai:publications.copernicus.org:ascmo49975 2023-05-15T14:59:20+02:00 A comparison of two methods for detecting abrupt changes in the variance of climatic time series Rodionov, Sergei N. 2018-01-15 application/pdf https://doi.org/10.5194/ascmo-2-63-2016 https://ascmo.copernicus.org/articles/2/63/2016/ eng eng doi:10.5194/ascmo-2-63-2016 https://ascmo.copernicus.org/articles/2/63/2016/ eISSN: 2364-3587 Text 2018 ftcopernicus https://doi.org/10.5194/ascmo-2-63-2016 2020-07-20T16:24:06Z Two methods for detecting abrupt shifts in the variance – Integrated Cumulative Sum of Squares (ICSS) and Sequential Regime Shift Detector (SRSD) – have been compared on both synthetic and observed time series. In Monte Carlo experiments, SRSD outperformed ICSS in the overwhelming majority of the modeled scenarios with different sequences of variance regimes. The SRSD advantage was particularly apparent in the case of outliers in the series. On the other hand, SRSD has more parameters to adjust than ICSS, which requires more experience from the user in order to select those parameters properly. Therefore, ICSS can serve as a good starting point of a regime shift analysis. When tested on climatic time series, in most cases both methods detected the same change points in the longer series (252–787 monthly values). The only exception was the Arctic Ocean sea surface temperature (SST) series, when ICSS found one extra change point that appeared to be spurious. As for the shorter time series (66–136 yearly values), ICSS failed to detect any change points even when the variance doubled or tripled from one regime to another. For these time series, SRSD is recommended. Interestingly, all the climatic time series tested, from the Arctic to the tropics, had one thing in common: the last shift detected in each of these series was toward a high-variance regime. This is consistent with other findings of increased climate variability in recent decades. Text Arctic Arctic Ocean Copernicus Publications: E-Journals Arctic Arctic Ocean Advances in Statistical Climatology, Meteorology and Oceanography 2 1 63 78 |
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Copernicus Publications: E-Journals |
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English |
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Two methods for detecting abrupt shifts in the variance – Integrated Cumulative Sum of Squares (ICSS) and Sequential Regime Shift Detector (SRSD) – have been compared on both synthetic and observed time series. In Monte Carlo experiments, SRSD outperformed ICSS in the overwhelming majority of the modeled scenarios with different sequences of variance regimes. The SRSD advantage was particularly apparent in the case of outliers in the series. On the other hand, SRSD has more parameters to adjust than ICSS, which requires more experience from the user in order to select those parameters properly. Therefore, ICSS can serve as a good starting point of a regime shift analysis. When tested on climatic time series, in most cases both methods detected the same change points in the longer series (252–787 monthly values). The only exception was the Arctic Ocean sea surface temperature (SST) series, when ICSS found one extra change point that appeared to be spurious. As for the shorter time series (66–136 yearly values), ICSS failed to detect any change points even when the variance doubled or tripled from one regime to another. For these time series, SRSD is recommended. Interestingly, all the climatic time series tested, from the Arctic to the tropics, had one thing in common: the last shift detected in each of these series was toward a high-variance regime. This is consistent with other findings of increased climate variability in recent decades. |
format |
Text |
author |
Rodionov, Sergei N. |
spellingShingle |
Rodionov, Sergei N. A comparison of two methods for detecting abrupt changes in the variance of climatic time series |
author_facet |
Rodionov, Sergei N. |
author_sort |
Rodionov, Sergei N. |
title |
A comparison of two methods for detecting abrupt changes in the variance of climatic time series |
title_short |
A comparison of two methods for detecting abrupt changes in the variance of climatic time series |
title_full |
A comparison of two methods for detecting abrupt changes in the variance of climatic time series |
title_fullStr |
A comparison of two methods for detecting abrupt changes in the variance of climatic time series |
title_full_unstemmed |
A comparison of two methods for detecting abrupt changes in the variance of climatic time series |
title_sort |
comparison of two methods for detecting abrupt changes in the variance of climatic time series |
publishDate |
2018 |
url |
https://doi.org/10.5194/ascmo-2-63-2016 https://ascmo.copernicus.org/articles/2/63/2016/ |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_source |
eISSN: 2364-3587 |
op_relation |
doi:10.5194/ascmo-2-63-2016 https://ascmo.copernicus.org/articles/2/63/2016/ |
op_doi |
https://doi.org/10.5194/ascmo-2-63-2016 |
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Advances in Statistical Climatology, Meteorology and Oceanography |
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2 |
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1 |
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63 |
op_container_end_page |
78 |
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1766331453970317312 |