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Spatial and temporal variability of seasonal precipitation in Poyang Lake basin and possible links with climate indices

机译：Po阳湖流域季节性降水的时空变化及其与气候指数的联系

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摘要

Based on the precipitation data of 21 meteorological stations in Poyang Lake basin, the temporal and spatial variability of seasonal precipitation was analyzed by wavelet analysis method. This study adopted the cross wavelet transform to analyze the correlation between the seasonal precipitation and climate indices in time and frequency scales, discussed the possible links between its precipitation variations and climate indices, and preliminarily analyzed its mechanism and regular pattern of variation. The results showed that the oscillations in 2-4 years' and 4-8 years' bands were the main variation periods of seasonal precipitation in Poyang Lake basin, In the 2-4 years' band, the years of rainfall peaks appearing in Poyang Lake were basically consistent with the years when El Nino appeared, and the precipitation oscillations in summer appeared more dramatic in space. According to analysis on the cross wavelet power spectra between different seasonal rainfalls and climate indices, certain correlations between climate factors and seasonal precipitation had existed in specific time periods. Large-scale climate oscillations like the El Niño/Southern Oscillation, North Atlantic Oscillation, Indian Ocean Dipole, and Pacific Decadal Oscillation caused the variability of large-scale circulations through their respective independent or inter-coupled climate systems, and affected the precipitation distribution in Poyang Lake basin by changing local climate conditions like the East Asian Monsoon.
机译：利用Po阳湖流域21个气象站的降水资料，运用小波分析法分析了季节性降水的时空变化。本研究采用交叉小波变换在时间和频率尺度上分析了季节性降水与气候指数之间的相关性，探讨了降水变化与气候指数之间的可能联系，并初步分析了其变化规律和规律。结果表明，Po阳湖流域2-4年和4-8年带的振荡是季节性降水的主要变化时期，在2-4年带中，Po阳湖出现了降雨高峰的年份。与厄尔尼诺现象出现的年份基本一致，夏季的降水振荡在空间上显得更为剧烈。通过分析不同季节降水量与气候指数之间的交叉小波功率谱，可以看出特定时期内气候因子与季节降水量之间存在一定的相关性。厄尔尼诺/南方涛动，北大西洋涛动，印度洋偶极子和太平洋年代际涛动等大规模气候振荡，通过各自独立的或相互耦合的气候系统，导致了大尺度环流的变化，并影响了非洲的降水分布。 changing阳湖流域受东亚季风等当地气候条件变化的影响。

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  • 来源
    《Nordic hydrology》 |2016年第1期|51-68|共18页
  • 作者

    Jun Shao; Jun Wang; Sunyun Lv; Jianping Bing;

  • 作者单位

    Bureau of Hydrology, Changjiang Water Resources Commission, Wuhan, China;

    Bureau of Hydrology, Changjiang Water Resources Commission, Wuhan, China;

    Bureau of Hydrology, Changjiang Water Resources Commission, Wuhan, China;

    Bureau of Hydrology, Changjiang Water Resources Commission, Wuhan, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    climate indices; poyang lake basin; seasonal precipitation; wavelet analysis;

    机译：气候指数;阳湖流域季节性降水;小波分析;

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