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夏季东亚高空副热带西风急流季节内异常的环流特征及前兆信号

张庆云 宣守丽 孙淑清

张庆云, 宣守丽, 孙淑清. 夏季东亚高空副热带西风急流季节内异常的环流特征及前兆信号[J]. 大气科学, 2018, 42(4): 935-950. doi: 10.3878/j.issn.1006-9895.1803.18107
引用本文: 张庆云, 宣守丽, 孙淑清. 夏季东亚高空副热带西风急流季节内异常的环流特征及前兆信号[J]. 大气科学, 2018, 42(4): 935-950. doi: 10.3878/j.issn.1006-9895.1803.18107
Qingyun ZHANG, Shouli XUAN, Shuqing SUN. Anomalous Circulation Characteristics of Intraseasonal Variation of East Asian Subtropical Westerly Jet in Summer and Precursory Signals[J]. Chinese Journal of Atmospheric Sciences, 2018, 42(4): 935-950. doi: 10.3878/j.issn.1006-9895.1803.18107
Citation: Qingyun ZHANG, Shouli XUAN, Shuqing SUN. Anomalous Circulation Characteristics of Intraseasonal Variation of East Asian Subtropical Westerly Jet in Summer and Precursory Signals[J]. Chinese Journal of Atmospheric Sciences, 2018, 42(4): 935-950. doi: 10.3878/j.issn.1006-9895.1803.18107

夏季东亚高空副热带西风急流季节内异常的环流特征及前兆信号

doi: 10.3878/j.issn.1006-9895.1803.18107
基金项目: 

国家自然科学基金项目 41375055

国家重点基础研究发展计划项目 2012CB957803

国家重点基础研究发展计划项目 2014CB954301

详细信息
    作者简介:

    张庆云, 女, 1950年出生, 研究员, 主要从事亚洲季风、海气相互作用、短期气候预测研究。E-mail:zqy@mail.iap.ac.cn

  • 中图分类号: P466

Anomalous Circulation Characteristics of Intraseasonal Variation of East Asian Subtropical Westerly Jet in Summer and Precursory Signals

Funds: 

National Natural Science Foundation of China 41375055

National Basic Research Program of China 2012CB957803

National Basic Research Program of China 2014CB954301

  • 摘要: 位于东亚中纬度上空的东亚高空副热带西风急流是东亚季风环流系统中的重要成员,我国夏季降水雨带的季节内变化受东亚高空副热带西风急流位置季节内异常变化影响。根据1979~2008年中国降水资料、NCEP/NCAR再分析资料以及NOAA ERSST V3月平均海表温度资料,利用统计分析和物理量诊断方法对夏季东亚高空副热带西风急流位置季节内异常的东亚大气环流特征及外强迫信号的物理过程进行了探讨。研究指出:6月东亚高空副热带西风急流位置异常主要受欧亚大陆中高纬东传的Rossby波列位相变化影响,春季北大西洋海温异常是欧亚大陆中高纬度Rossby波列位相变化的最显著的外强迫信号;7月东亚高空副热带西风急流位置异常主要受西太平洋热带向副热带传播的Rossby波列位相变化影响,春季西太平洋热带海温异常是西太平洋热带向副热带传播的Rossby波列位相变化的最显著的外强迫信号;8月东亚高空副热带西风急流位置异常主要受南亚大陆向东亚大陆热带、副热带传播的Rossby波列位相变化影响,春季印度洋海温异常是南亚大陆向东亚大陆热带、副热带传播的Rossby波列位相变化的最显著的外强迫信号。
  • 图  1  200 hPa东亚高空副热带西风急流轴位置的气候平均逐月变化:(a)3月~8月;(b)9月~2月。圆圈表示各月最大风速中心位置

    Figure  1.  Monthly averaged climatological position of the EASWJ (East Asian Subtropical Westerly Jet) axis at 200 hPa: (a) March to August; (b) September to February. The circles denote the positions of monthly maximum wind speed

    图  2  1951~2008年月平均200 hPa纬向风(单位:m s−1):(a)6月;(b)7月;(c)8月

    Figure  2.  Monthly averaged 200h-Pa zonal wind (units: m s−1) during 1951–2008: (a) June; (b) July; (c) August

    图  3  1951~2008年月平均标准化的东亚高空副热带西风急流位置指数:(a)6月;(b)7月;(c)8月。绿点实线为9年滑动平均

    Figure  3.  Normalized time series of monthly mean position index of EASWJ (EASWJPI) during 1951–2008: (a) June; (b) July; (c) August. The green solid line with dots indicates 9-year moving average of the EASWJPI

    图  4  1979~2008年6月东亚高空副热带西风急流位置指数与同期(a)500 hPa位势高度场的相关系数、(b)200 hPa风场的相关。暖(冷)色表示正(负)相关,浅、深阴影区分别表示信度水平为95%、99%

    Figure  4.  Simultaneous correlation maps of the EASWJPI in June with (a) 500-hPa geopotential height and (b) 200-hPa winds during 1979–2008. Warm (cold) color indicates positive (negative) correlation; light and dark shadings indicate 95% and 99% confidence levels, respectively

    图  5  6月500 hPa位势高度距平(等值线,单位:gpm)、波作用通量(箭头,单位:m2 s−2)、波作用通量散度(单位:10−6 m s−2,暖色、冷色阴影代表辐散、辐合)合成场:(a)东亚高空副热带西风急流位置偏南年;(b)东亚高空副热带西风急流位置偏北年

    Figure  5.  Composites of 500-hPa geopotential height anomalies (contours, units: gpm), wave activity fluxes (vectors, units: m2 s−2), and divergence of the wave activity fluxes (shadings, units: 10−6 m s−2) in June for years (a) when the EASWJPI is located to the south of its normal position and (b) when the EASWJPI is located to the north of its normal position. Warm (cool) color shading indicates divergence (convergence)

    图  6  图 4,但为7月的相关

    Figure  6.  As in Fig. 4, but for simultaneous correlation maps of the EASWJPI in July

    图  7  图 5,但为7月的合成场

    Figure  7.  As in Fig. 5, but for composites in July

    图  8  图 4,但为8月的相关

    Figure  8.  As in Fig. 4, but for simultaneous correlation maps of the EASWJPI in August

    图  9  图 5,但为8月的合成场

    Figure  9.  As in Fig. 5, but for composites in August

    图  10  1979~2008年月平均东亚高空副热带西风急流位置指数与春季海表温度相关系数:(a)6月;(b)7月;(c)8月。方框区为通过95%信度水平的海温关键区,浅、深阴影区分别表示信度水平为95%、99%

    Figure  10.  Correlation coefficients between EASWJPI and SST in spring during 1951–2008: (a) June; (b) July; (c) August. The boxes indicate key areas of sea surface temperature that correlation coefficient exceed the 95% confidence level. Light and dark shadings indicate 95% and 99% confidence levels, respectively

    图  11  6月200 hPa位势高度距平(等值线,单位:gpm)、波作用通量(箭头,单位:m2 s−2)、波作用通量散度(单位:10−6 m s−2,暖色、冷色阴影代表辐散、辐合)合成场:(a)春季IA正指数年;(b)春季IA负指数年

    Figure  11.  Composites of 200-hPa geopotential height anomaly (contours, units: gpm), wave activity fluxes (arrows, units: m2 s−2), and divergence of wave activity fluxes (shadings, units: 10−6 m s−2) in June for years with (a) positive IA (the index of North Atlantic SST anomalies in spring) indices and (b) negative IA indices in spring. Warm (cool) color shading indicates divergence (convergence)

    图  12  7月500 hPa位势高度距平(等值线,单位:gpm)、波作用通量(箭头,单位:m2 s−2)、波作用通量散度(单位:10−6 m s−2,暖色、冷色阴影代表辐散、辐合)合成场:(a)春季IWP负指数年;(b)春季IWP正指数年

    Figure  12.  Composites of 500-hPa geopotential height anomalies (contours, units: gpm), wave activity fluxes (arrows, units: m2 s−2), and divergence of wave activity fluxes (shadings, units: 10−6 m s−2) in July for years with (a) negative IWP (the index of tropical western Pacific SST anomalies in spring) indices and (b) positive IWP indices in spring. Warm (cool) color shadings indicate divergence (convergence)

    图  13  8月(a、b)850 hPa风场距平和(c、d)200 hPa风场距平合成(箭头,单位:m s−1):(a、c)春季IIND正指数年;(b、d)春季IIND负指数年。图c、d的红虚线表示42.5°N,红色箭头表示西风加强。暖(冷)色表示纬向风正(负)异常,浅、深阴影区分别表示信度水平为95%、99%

    Figure  13.  Composites of wind anomalies (arrows, units: m s−1) at (a, b) 850 hPa and (c, d) 200 hPa in August for years with (a, c) positive IIND (the index of Indian Ocean SST anomalies in spring) indices and (b, d) negative IIND indices in spring. Red dashed line indicates 42.5°N and the red arrow indicates that the westerly wind is strengthening in Figs. c, d. Warm (cold) color indicates zonal wind positive (negative) anomalies, the light and dark shadings indicate confidence levels at 95% and 99%

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出版历程
  • 收稿日期:  2018-01-05
  • 网络出版日期:  2018-03-12
  • 刊出日期:  2018-07-15

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