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

Li Jingyi; Wang Zunya; Wen Min

doi:10.11898/1001-7313.20200602

Vol.31, NO.6, 2020

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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.

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.

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

DOI: 10.11898/1001-7313.20200602

Li Jingyi¹,
Wang Zunya^{2
,
,},
Wen Min¹

1.
State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081
2.
National Climate Center, Beijing 100081

Received Date: 2020-07-06
Rev Recd Date: 2020-08-20
Publish Date: 2020-10-27

Abstract

Abstract

Different variables present discrepancy in characteristics of the quasi-biweekly oscillation (QBWO), which is a dominant sub-seasonal signal in the East Asian monsoon regime. However, there is limited investigation about similarities and differences in features of QBWO presented by varying variables. In order to fill this gap, adopting the empirical orthogonal function (EOF) and composite analysis, such variables as outgoing longwave radiation (OLR), 500 hPa potential vorticity (PV), 850 hPa relative vorticity, 850 hPa zonal wind, 850 hPa meridional wind and 750 hPa specific humidity are compared, regarding of the spatial-temporal distribution, intensity and propagation of QBWO over the East Asian monsoon region. It is found that all these variables show significant QBWO across the region with similar spatial and temporal variation. And the strongest QBWO is observed over the South China Sea (SCS) with all variables. QBWO in OLR propagates north-westward over the East Asian monsoon regime. Centres of active (suppressed) QBWO convection correspond to positive (negative) PV anomalies at 500 hPa level and cyclonic (anticyclonic) vortex at 850 hPa level. These circulations form a northwest-southeast tilted wave train. Two leading modes of QBWO in 500 hPa PV, 850 hPa relative vorticity and 850 hPa zonal wind have greater meridional magnitude than those of OLR. QBWO in three variables also propagate north-westward, but spread faster to north. Oppositely, two leading modes of QBWO in 850 hPa meridional wind are characterized by the zonal dipole pattern and the westward propagation is evident. Actually, its speed of northward propagation is the slowest of all. Different from all others, QBWO in 750 hPa specific humidity propagates south-eastward, and variances explained by QBWO of 750 hPa specific humidity is the smallest. As for the intensity of QBWO, except for 750 hPa specific humidity, other variables have consistent inter-annual variation. Totally, affected by such complex physical processes as transformation of precipitation state, release of heat and so on, characteristics of QBWO is hardly captured by 750 hPa specific humidity. However, OLR, 500 hPa PV, 850 hPa relative vorticity, 850 hPa zonal wind and 850 hPa meridional wind can well characterize QBWO over the East Asian monsoon region. Of all variables compared in this analysis, 500 hPa PV and 850 hPa relative vorticity are highly consistent in describing QBWO over the East Asian monsoon region. Specific causes that lead to different characteristics of QBWO over the East Asian monsoon regime presented by different variables need further discussion, which can provide a new reference for selecting monitoring indices for QBWO over the East Asian monsoon region.
- different elements;
- quasi-biweekly oscillation;
- feature comparison

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References(51)

Figures and Tables

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

DownLoad: Full-Size Img PowerPoint

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)

DownLoad: Full-Size Img PowerPoint

图 3 同图 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

DownLoad: Full-Size Img PowerPoint

图 4 同图 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

DownLoad: Full-Size Img PowerPoint

图 5 同图 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

DownLoad: Full-Size Img PowerPoint

图 6 同图 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

DownLoad: Full-Size Img PowerPoint

图 7 同图 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

DownLoad: Full-Size Img PowerPoint

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)

DownLoad: Full-Size Img PowerPoint

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)

DownLoad: Full-Size Img PowerPoint

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

DownLoad: Full-Size Img PowerPoint

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