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| Titel |
Decadal Modulation of Precipitation Patterns over Eastern China by Sea Surface Temperature Anomalies |
| VerfasserIn |
Qing Yang, Zhuguo Ma |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250087639
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| Publikation (Nr.) |
 EGU/EGU2014-1698.pdf |
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| Zusammenfassung |
| Annual precipitation anomalies over eastern China are characterized by a south-north dipole
structure referred to as the southern flood/northern drought (SF/ND) pattern fluctuating on
decadal timescales. A sign shift from one phase to another alters climatic conditions over the
entire eastern China region with enormous impact on society, one of which took place around
1976/1977. This paper investigates the driving mechanism of this decadal precipitation
pattern and its climate shifts using both observations and idealized climate model
experiments conducted by the U.S. CLIVAR Drought Working Group. Observed sea
surface temperature (SST) anomalies are projected onto three leadings patterns of
climate modes and a group of models are forced with different combinations of these
climate modes. We find that the Pacific SST dominates the precipitation patterns over
eastern China at decadal scales and its influence is enhanced by the Atlantic SST
anomalies of the opposite sign. During a warm phase of the Pacific Decadal Oscillation
(PDO) and the cold phase of Atlantic Multi-decadal Oscillation (AMO), large-scale
atmospheric circulation favors increased moisture convergence and upward motion
over South China, while the opposite occurs over North China, resulting in more
precipitation over the South and less precipitation over the North (SF/ND). The opposite
pattern occurs during the cold phase of PDO in combination with a warm phase
of the AMO. The findings from this paper could be used to predict precipitation
pattern shifts over this region using climate information of the PDO and AMO. |
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