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Spatio-temporal Variability of Northern Hemipheric Sea Level Pressure (SLP) and Precipitation over the Mid-to-Low Reaches of the Yangtze River


doi: 10.1007/s00376-008-0458-x

  • The spatio-temporal variability of Northern Hemisphere Sea Level Pressure (SLP) and precipitation over the mid-to-low reaches of the Yangtze River (PMLY) is analyzed jointly using the multi-taper /singular value decomposition method (MTM-SVD). Statistically significant narrow frequency bands are obtained from the local fractional variance (LFV) spectrum. Significant interdecadal (i.e., 16-to-18-year periods) and interannual (i.e., 3-to-6-year periods) signals are identified. Moreover, a significant quasi-biennial signal is identified but only for PMLY data. The spatial joint evolution of patterns obtained for peaks in the LFV spectrum sheds light on relationships between SLP and PMLY: the Arctic Oscillation (AO) modulates the variability of the PMLY while the interannual variability of PMLY is in phase with the Northern Atlantic Oscillation (NAO) and the Northern Pacific Oscillation (NPO).
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Manuscript History

Manuscript received: 10 May 2008
Manuscript revised: 10 May 2008
通讯作者: 陈斌, bchen63@163.com
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Spatio-temporal Variability of Northern Hemipheric Sea Level Pressure (SLP) and Precipitation over the Mid-to-Low Reaches of the Yangtze River

  • 1. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029; State Key Laboratory for Earth Surface Processes and Resource Ecology, Beijing Normal University, 100875;State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081;MEDIAS-France, Toulouse, France; LDEO of Columbia University, New York, USA;State Key Laboratory for Earth Surface Processes and Resource Ecology, Beijing Normal University, 100875

Abstract: The spatio-temporal variability of Northern Hemisphere Sea Level Pressure (SLP) and precipitation over the mid-to-low reaches of the Yangtze River (PMLY) is analyzed jointly using the multi-taper /singular value decomposition method (MTM-SVD). Statistically significant narrow frequency bands are obtained from the local fractional variance (LFV) spectrum. Significant interdecadal (i.e., 16-to-18-year periods) and interannual (i.e., 3-to-6-year periods) signals are identified. Moreover, a significant quasi-biennial signal is identified but only for PMLY data. The spatial joint evolution of patterns obtained for peaks in the LFV spectrum sheds light on relationships between SLP and PMLY: the Arctic Oscillation (AO) modulates the variability of the PMLY while the interannual variability of PMLY is in phase with the Northern Atlantic Oscillation (NAO) and the Northern Pacific Oscillation (NPO).

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