Oscillatory climate modes in the Eastern Mediterranean: Synchronization with the NAO and Southern Oscillation
Oscillatory climatic modes over the North Atlantic, Ethiopian Plateau, Eastern Mediterranean and the Tropical Pacific Ocean were examined in instrumental and proxy records from these regions. The teleconnections between the regions were studied in terms of synchronization of chaotic oscillators. We...
| Main Authors: | , , |
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| Format: | Text |
| Language: | English |
| Published: |
2009
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| Subjects: | |
| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.150.6977 http://www.atmos.ucla.edu/tcd/PREPRINTS/Nile_NAO_v24a-Text.pdf |
| Summary: | Oscillatory climatic modes over the North Atlantic, Ethiopian Plateau, Eastern Mediterranean and the Tropical Pacific Ocean were examined in instrumental and proxy records from these regions. The teleconnections between the regions were studied in terms of synchronization of chaotic oscillators. We modify standard methods for studying synchronization among such oscillators by combining them with advanced spectral methods, including singular spectral analysis. This modification helps test, besides the degree of synchronization, also the strength of the coupling. A prominent oscillatory mode with a 7-year period was found in all the climatic regions studied here and is completely synchronized with this mode over the North Atlantic. An energy analysis of the synchronization raises the possibility that this mode originates in fact in the North Atlantic. Evidence is discussed for this mode being induced by the 7–8-year oscillation in the position of the Gulf Stream front. A mechanism for the teleconnections between the North Atlantic, Ethiopian Plateau and Eastern Mediterranean is proposed. An |
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