| 近65年ENSO事件强度变化及时频特征研究 |
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| 引用本文： | 陈虹颖,徐峰,李晓惠,夏天竹,张羽.近65年ENSO事件强度变化及时频特征研究[J].热带气象学报,2017,33(5):683-694. |
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| 作者姓名： | 陈虹颖 徐峰 李晓惠 夏天竹 张羽 |
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| 作者单位： | 1.广东海洋大学海洋与气象学院，广东 湛江 524088 |
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| 基金项目： | 国家自然科学基金41475120广东省自然科学基金-重大基础研究培育项目2015A030308014 |
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| 摘 要： | 利用海洋尼诺指数(ONI)、南方涛动指数(SOI)和多变量ENSO指数(MEI)等ENSO特征值分析了1951年1月—2016年5月近65年ENSO事件的强度与时频特征，并将其强度划分为5个等级。结果表明:近65年共发生22次暖事件（El Ni?o）和13次冷事件（La Ni?a）；对ENSO特征值进行频次分析发现，强El Ni?o月份所占比例比强La Ni?a多；使用连续小波、交叉小波和小波相干分析得出，ENSO循环主要具有2~7 a的周期，还具有10~16 a的年代际变化。
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| 关 键 词： | ENSO 时频特征 强度 年际及年代际变化 |
| 收稿时间： | 2016-06-29 |
INTENSITIES AND TIME-FREQUENCY VARIABILITY OF ENSO IN THE LAST 65 YEARS |
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| Institution: | 1.College of Oceanography and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China2.Meteorological Administration of Tianjin Binhai New Area, Tianjin 300457, China3.Climatic Center of Guangdong, Guangzhou 510640, China |
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| Abstract: | Based on multiple El Ni?o-Southern Oscillation (ENSO) indices, Oceanic Ni?o index (ONI), Southern Oscillation index (SOI), Multivariate ENSO index (MEI), etc. we classified the intensities of ENSO events into five levels, analyzed the intensities and time-frequency variability of ENSO events during the period 1951-2016. Over the last 65 years, there have been 22 warm events (El Ni?o) and 13 cold events (La Ni?a). Frequency analysis is applied to the indexes of ENSO, which indicates that the percentage of strong warm events months is much more than that of strong cold events months. Three methods of time-frequency-continuous wavelet analysis, cross wavelet analysis, wavelet coherency-were used, and the results are in good agreement with the principal period (2~7-yr) and the interdecadal variability (10~16-yr) of ENSO cycle. |
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