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キーワード:
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要旨:
Relations between Tibetan Plateau precipitation
and large-scale climate indices are studied based on the
Standardized Precipitation Index (SPI) and the boreal
summer season. The focus is on the decadal variability of
links between the large-scale circulation and the plateau
drought and wetness. Analysis of teleconnectivity of the
continental northern hemisphere standardized summer
precipitation reveals the Tibetan Plateau as a major SPI
teleconnectivity center in south-eastern Asia connecting
remote correlation patterns over Eurasia. Employing a
moving window approach, changes in covariability and
synchronizations between Tibetan Plateau summer SPI and
climate indices are analyzed on decadal time scales.
Decadal variability in the relationships between Tibetan
Plateau summer SPI and the large-scale climate system is
characterized by three shifts related to changes in the North
Atlantic, the Indian Ocean, and the tropical Pacific.
Changes in the North Atlantic variability (North Atlantic
Oscillation) result in a stable level of Tibetan Plateau
summer SPI variability; the response to changes in tropical
Pacific variability is prominent in various indices such as
Asian monsoon, Pacific / North America, and East Atlantic/
Western Russia pattern.
