李慧敏,徐海明,李智玉. 2017. El Ni?o年西北太平洋异常反气旋的年际变化特征及其影响[J]. 气象学报, ():-, doi:10.11676/qxxb2017.042
El Ni?o年西北太平洋异常反气旋的年际变化特征及其影响
Inter-annual Variation of the Western North Pacific Anomalous Anticyclone during El Ni?o Years and its Impact
投稿时间:2016-12-30  最后修改时间:2017-02-16
DOI:10.11676/qxxb2017.042
中文关键词:  El Ni?o,西北太平洋异常反气旋,太平洋西部型,北极涛动,东亚-太平洋型
英文关键词:El Ni?o, WNPAC, WP, AO, EAP
基金项目:国家自然科学基金,江苏省333高层次人才培养工程
作者单位E-mail
李慧敏 南京信息工程大学大气科学学院 huiminli92@126.com 
徐海明 南京信息工程大学大气科学学院 hxu@nuist.edu.cn 
李智玉 南京信息工程大学大气科学学院 xylizhyu_123@163.com 
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中文摘要:
      基于1901-2000年多种海气资料,分析了El Ni?o成熟年冬季——初夏西北太平洋异常反气旋(WNPAC)的年际变化特征及其对东亚气候的影响。结果表明,无论是El Ni?o成熟期的冬季还是随后的春季和初夏,WNPAC的年际变化主要存在两个空间变化型,即反映其强度变化的第一模态和反映其位置变化的第二模态。El Ni?o成熟年冬季WNPAC强度不仅与赤道中东太平洋海温异常有关,而且与太平洋西部(WP)型遥相关的强度有关,而其位置的变化则主要与西北太平洋局地海温异常以及北极涛动(AO)有关;次年春季,WNPAC的强度除了与赤道中东太平洋海温异常和WP型遥相关存在显著相关外,还与赤道大西洋海温异常有关,而其位置的变化则主要与西北太平洋局地海温异常和WP型遥相关有关;次年初夏,WNPAC强度主要与西北印度洋和西南印度洋的海温异常以及东亚-太平洋(EAP)型遥相关的强度有关。进一步分析表明,成熟年冬季——初夏WNPAC的强度和位置的变化均可对东亚地区降水异常分布产生影响,这对预测El Ni?o发生后冬季及后期春夏季节东亚地区降水异常分布具有一定的指示意义。此外,次年初夏,WNPAC强度变化与西北太平洋台风发生频数存在显著负相关,即:WNPAC越强,台风发生的频数越少,反之亦然。
英文摘要:
      The inter-annual variation of the Western North Pacific anomalous anticyclone (WNPAC) during El Ni?o years are investigated based on a variety of air-sea datasets during the period of 1901 to 2000, and its impact on East Asian climate is also discussed. Results show that there are two main spatiotemporal modes for the WNPAC based on empirical orthogonal function (EOF) analysis, i.e., the first mode as its intensity variation and the second mode as its position variation. During the El Ni?o mature phase in winter, the WNPAC intensity is highly correlated with the sea surface temperature anomalies (SSTAs) over the equatorial central-eastern Pacific and the West Pacific (WP) teleconnection pattern at 500hPa, while its position is highly related to the SSTAs over the western North Pacific and Arctic Oscillation (AO); In the subsequent spring season after the El Ni?o mature phase, the intensity of WNPAC is also highly correlated with the SSTAs over the equatorial Atlantic except for its high correlation with the SSTAs over the equatorial central-eastern Pacific and WP teleconnection pattern as mentioned in winter. While its position is markedly influenced by the SSTAs over the western North Pacific and WP teleconnection pattern. In the subsequent early summer, the intensity of WNPAC is highly related to SSTAs over the northwestern and southwestern Indian Ocean and East Asia-Pacific (EAP) teleconnection pattern. Results further indicate that the inter-annual variations of both the WNPAC intensity and position have great impacts on precipitation over the East Asia during El Ni?o mature winter, and subsequent spring and early summer. Additionally, the intensity of the WNPAC is also highly negatively correlated with the occurrence frequency of tropical cyclones over the western North Pacific during the early summer, i.e., the stronger the WNPAC intensity is , the less the number of tropical cyclone is , and vice versa.
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