Long-term memory in 1000-year simulated temperature records
We study the appearance of long-term persistence in temperature records, obtained from the global coupled general circulation model ECHO-G for two runs, using detrended fluctuation analysis. The first run is a historical simulation for the years 1000-1990 (with greenhouse gas, solar, and volcanic fo...
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ftpubman:oai:pure.mpg.de:item_1920849 2023-08-20T04:02:25+02:00 Long-term memory in 1000-year simulated temperature records Rybski, D. Bunde, A. von Storch, H. 2008 http://hdl.handle.net/11858/00-001M-0000-0018-24CB-2 eng eng info:eu-repo/semantics/altIdentifier/doi/10.1029/2007JD008568 http://hdl.handle.net/11858/00-001M-0000-0018-24CB-2 JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES info:eu-repo/semantics/article 2008 ftpubman https://doi.org/10.1029/2007JD008568 2023-08-01T20:17:09Z We study the appearance of long-term persistence in temperature records, obtained from the global coupled general circulation model ECHO-G for two runs, using detrended fluctuation analysis. The first run is a historical simulation for the years 1000-1990 (with greenhouse gas, solar, and volcanic forcing), while the second run is a 1000-year "control run'' with constant external forcings. We consider daily data of all grid points as well as their biannual averages in order to suppress 2-year oscillations appearing in the model records for some sites near the equator. Our results substantially confirm earlier studies of (considerably shorter) instrumental data and extend their results from decades to centuries. In the case of the historical simulation we find that most continental sites have correlation exponents gamma between 0.8 and 0.6. For the ocean sites the long-term correlations seem to vanish at the equator and become nonstationary at the Arctic and Antarctic circles. In the control run the long-term correlations are less pronounced. Compared with the historical run, the correlation exponents are increased, and show a more pronounced latitude dependence, visible also at continental sites. When analyzing biannual averages, we find stronger long-term correlations in the historical run at continental sites and a less pronounced latitude dependence. In all cases, the exponent gamma does not depend on the continentality of the sites. Article in Journal/Newspaper Antarc* Antarctic Arctic Max Planck Society: MPG.PuRe Antarctic Arctic Journal of Geophysical Research 113 D2 |
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Max Planck Society: MPG.PuRe |
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English |
description |
We study the appearance of long-term persistence in temperature records, obtained from the global coupled general circulation model ECHO-G for two runs, using detrended fluctuation analysis. The first run is a historical simulation for the years 1000-1990 (with greenhouse gas, solar, and volcanic forcing), while the second run is a 1000-year "control run'' with constant external forcings. We consider daily data of all grid points as well as their biannual averages in order to suppress 2-year oscillations appearing in the model records for some sites near the equator. Our results substantially confirm earlier studies of (considerably shorter) instrumental data and extend their results from decades to centuries. In the case of the historical simulation we find that most continental sites have correlation exponents gamma between 0.8 and 0.6. For the ocean sites the long-term correlations seem to vanish at the equator and become nonstationary at the Arctic and Antarctic circles. In the control run the long-term correlations are less pronounced. Compared with the historical run, the correlation exponents are increased, and show a more pronounced latitude dependence, visible also at continental sites. When analyzing biannual averages, we find stronger long-term correlations in the historical run at continental sites and a less pronounced latitude dependence. In all cases, the exponent gamma does not depend on the continentality of the sites. |
format |
Article in Journal/Newspaper |
author |
Rybski, D. Bunde, A. von Storch, H. |
spellingShingle |
Rybski, D. Bunde, A. von Storch, H. Long-term memory in 1000-year simulated temperature records |
author_facet |
Rybski, D. Bunde, A. von Storch, H. |
author_sort |
Rybski, D. |
title |
Long-term memory in 1000-year simulated temperature records |
title_short |
Long-term memory in 1000-year simulated temperature records |
title_full |
Long-term memory in 1000-year simulated temperature records |
title_fullStr |
Long-term memory in 1000-year simulated temperature records |
title_full_unstemmed |
Long-term memory in 1000-year simulated temperature records |
title_sort |
long-term memory in 1000-year simulated temperature records |
publishDate |
2008 |
url |
http://hdl.handle.net/11858/00-001M-0000-0018-24CB-2 |
geographic |
Antarctic Arctic |
geographic_facet |
Antarctic Arctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_source |
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2007JD008568 http://hdl.handle.net/11858/00-001M-0000-0018-24CB-2 |
op_doi |
https://doi.org/10.1029/2007JD008568 |
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Journal of Geophysical Research |
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113 |
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D2 |
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1774712857836912640 |