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多要素表征的东亚季风区准双周振荡特征

李靖怡 王遵娅 温敏

李靖怡, 王遵娅, 温敏. 多要素表征的东亚季风区准双周振荡特征. 应用气象学报, 2020, 31(6): 653-667. DOI: 10.11898/1001-7313.20200602.
引用本文: 李靖怡, 王遵娅, 温敏. 多要素表征的东亚季风区准双周振荡特征. 应用气象学报, 2020, 31(6): 653-667. DOI: 10.11898/1001-7313.20200602.
Li Jingyi, Wang Zunya, Wen Min. Characteristics of QBWO over the East Asian monsoon region presented by different elements. J Appl Meteor Sci, 2020, 31(6): 653-667. DOI:  10.11898/1001-7313.20200602
Citation: Li Jingyi, Wang Zunya, Wen Min. Characteristics of QBWO over the East Asian monsoon region presented by different elements. J Appl Meteor Sci, 2020, 31(6): 653-667. DOI:  10.11898/1001-7313.20200602

多要素表征的东亚季风区准双周振荡特征

DOI: 10.11898/1001-7313.20200602
资助项目: 

国家重点研究发展计划 2016YFA0600602

国家自然科学基金项目 41775060

详细信息
    通信作者:

    王遵娅, wangzy@cma.gov.cn

Characteristics of QBWO over the East Asian Monsoon Region Presented by Different Elements

  • 摘要: 为评估不同要素对东亚季风区准双周振荡的表征能力,对大气向外长波辐射(OLR)、500 hPa位势涡度、850 hPa相对涡度、850 hPa风场和750 hPa比湿等要素的准双周振荡特征进行对比,发现各要素均能很好反映东亚季风区明显的准双周振荡时空特征。OLR及500 hPa位势涡度、850 hPa相对涡度、850 hPa纬向风表征的准双周振荡呈明显的西北向传播特征,500 hPa位势涡度、850 hPa相对涡度、850 hPa纬向风北传更强,北传速度更快。850 hPa经向风的准双周振荡呈明显西移特征,北传弱,北传速度最慢。而750 hPa比湿准双周振荡呈东南向传播。不同要素准双周振荡的强度略有差异,其中750 hPa比湿与其他要素的差异大。总体而言,750 hPa比湿不能较好地表现出东亚季风区准双周振荡活动特征,而其余要素能很好地表征东亚季风区大气准双周振荡,其中500 hPa位势涡度和850 hPa相对涡度准双周振荡特征一致性高。
  • 图  1  1979—2018年5—10月OLR的方差分布

    (a)未滤波的OLR,(b)10~20 d滤波的OLR,(c)30~60 d滤波的OLR,(d)10~20 d滤波与30~60 d滤波的OLR方差之比

    Fig. 1  Variance distribution of OLR from May to Oct in 1979-2018

    (a)unfiltered OLR, (b)10-20 d filtered OLR, (c)30-60 d filtered OLR, (d)the ratio of variance of 10-20 d filtered OLR to variance of 30-60 d filtered OLR

    图  2  根据10~20 d滤波的OLR进行EOF分析结果对10~20 d滤波的850 hPa风场(矢量)、OLR距平场(填色)和500 hPa位势涡度(绿色等值线,单位:10-2 PVU,1 PVU=10-6·K·m2·kg-1·s)在准双周振荡不同位相合成图

    (图中所示的850 hPa风场、OLR距平场和500 hPa位势涡度均达到0.05显著性水平)

    Fig. 2  Composite 10-20 d filtered 850 hPa wind(the vector), OLR anomaly(the shaded) and 500 hPa potential vorticity(the contour, unit:10-2 PVU, where 1 PVU=10-6·K·m2·kg-1·s) in different phases of the quasi-biweekly oscillation based on EOF modes of 10-20 d filtered OLR

    (OLR, 850 hPa wind and 500 hPa potential vorticity passing the test of 0.05 level are plotted)

    图  3  图 2,但为10~20 d滤波的500 hPa位势涡度EOF分析结果

    Fig. 3  The same as in Fig. 2, but for EOF modes of 10-20 d filtered 500 hPa potential vorticity

    图  4  图 2,但为10~20 d滤波的850 hPa相对涡度EOF分析结果

    Fig. 4  The same as in Fig. 2, but for EOF modes of 10-20 d filtered 850 hPa relative vorticity

    图  5  图 2,但为10~20 d滤波的850 hPa纬向风EOF分析结果

    Fig. 5  The same as in Fig. 2, but for EOF modes of 10-20 d filtered 850 hPa zonal wind

    图  6  图 2,但为10~20 d滤波的850 hPa经向风EOF分析结果

    Fig. 6  The same as in Fig. 2, but for EOF modes of 10-20 d filtered 850 hPa meridional wind

    图  7  图 2,但为10~20 d滤波的750 hPa比湿EOF分析结果

    Fig. 7  The same as in Fig. 2, but for EOF modes of 10-20 d filtered 750 hPa specific humidity

    图  8  10~20 d滤波的OLR根据OLR(a)、500 hPa位势涡度(b)、850 hPa相对涡度(c)、850 hPa纬向风(d)、850 hPa经向风(e)和750 hPa比湿(f)准双周振荡主成分进行合成的的经度-位相剖面

    (单位:W·m-2,填色区表示达到0.05显著性水平)

    Fig. 8  Longitude-phase section of 10-20 d filtered OLR based on the quasi-biweekly oscillation principal components of OLR(a), 500 hPa potential vorticity(b), 850 hPa relative vorticity(c), 850 hPa zonal wind(d), 850 hPa meridional wind(e) and 750 hPa specific humidity(f)

    (unit:W·m-2, the shaded denotes passing the test of 0.05 level)

    图  9  10~20 d滤波的OLR根据OLR(a)、500 hPa位势涡度(b)、850 hPa相对涡度(c)、850 hPa纬向风(d)、850 hPa经向风(e)和750 hPa比湿(f)准双周振荡主成分进行合成的的纬度-位相剖面

    (单位:W·m-2,填色区表示达到0.05显著性水平)

    Fig. 9  Latitude-phase section of 10-20 d filtered OLR based on the quasi-biweekly oscillation principal components of OLR(a), 500 hPa potential vorticity(b), 850 hPa relative vorticity(c), 850 hPa zonal wind(d), 850 hPa meridional wind(e) and 750 hPa specific humidity(f)

    (unit:W·m-2, the shaded denotes passing the test of 0.05 level)

    图  10  1979—2018年5—10月东亚季风区平均OLR和500 hPa位势涡度、850hPa相对涡度、850 hPa纬向风、850 hPa经向风、750 hPa比湿准双周振荡的强度标准化值演变

    Fig. 10  Standardized intensity of quasi-biweekly oscillation in OLR and 500 hPa potential vorticity, 850 hPa relative vorticity, 850hPa zonal wind, 850 hPa meridional wind, 750 hPa specific humidity averaged over East Asian monsoon region from May to Oct in 1979-2018

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