Propagation and influence on tropical precipitation of intraseasonal variation over mid-latitude East Asia in boreal winter
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摘要
本文研究冬季东亚中纬度地区9–29天季节内变化的传播特征和其对热带降水的影响。分析发现风场的季节内信号既可以向东传播,也可以向南传播。向东传播时,风场的季节内信号主要限于中纬度地区,表现为气旋和反气旋的向东移动。向南传播时,源于中纬度的经向风扰动可以深入到低纬度地区,甚至到达赤道附近。伴随的辐合辐散引起赤道附近地区降水异常,形成南海南部和中国东部-日本之间一个南北向偶极型降水异常。一个异常经向翻转环流在连接热带和中纬度季节内风场和降水变化中起着重要作用。
The authors investigate the characteristics of propagation and the influence on tropical precipitation of 9–29-day intraseasonal variation over midlatitude East Asia during boreal winter, and find that the intraseasonal wind signal can propagate both eastward and southward. In the case of eastward propagation, the intraseasonal wind signal is mainly confined to the midlatitudes,featuring eastward migration of anomalous cyclones and anticyclones. In the case of southward propagation, intraseasonal meridional wind perturbations may extend from the mid to the low latitudes, and even the equatorial region. The accompanying wind convergence/divergence induces anomalous precipitation in the near-equatorial regions, forming a north–south dipole precipitation anomaly pattern between the southern South China Sea and the eastern China–Japan region. An anomalous meridional overturning circulation plays an important role in linking tropical and midlatitude intraseasonal wind and precipitation variations.
The authors investigate the characteristics of propagation and the influence on tropical precipitation of 9–29-day intraseasonal variation over midlatitude East Asia during boreal winter, and find that the intraseasonal wind signal can propagate both eastward and southward. In the case of eastward propagation, the intraseasonal wind signal is mainly confined to the midlatitudes,featuring eastward migration of anomalous cyclones and anticyclones. In the case of southward propagation, intraseasonal meridional wind perturbations may extend from the mid to the low latitudes, and even the equatorial region. The accompanying wind convergence/divergence induces anomalous precipitation in the near-equatorial regions, forming a north–south dipole precipitation anomaly pattern between the southern South China Sea and the eastern China–Japan region. An anomalous meridional overturning circulation plays an important role in linking tropical and midlatitude intraseasonal wind and precipitation variations.
引文
Cao,X.,and R.Wu.2017.“Origins of Intraseasonal Rainfal Variations over the Southern South China Sea in Borea Winter.”Atmospheric and Oceanic Science Letters 10(1)44-50.doi:10.1080/16742834.2017.1232584.
Cao,X.,and R.Wu.2018.“Origins and Interrelationship of Intraseasonal Rainfall Variations around the Maritime Continent during Boreal Winter.”Theoretical and Applied Climatology 132(1-2):543-554.doi:10.1007/s00704-017-2106-9.
He,J.,H.Lin,and Z.Wu.2011.“Another Look at Influences of the Madden-Julian Oscillation on the Wintertime East Asian Weather.”Journal of Geophysical Research 116:D03109doi:10.1029/2010JD014787.
Huffman,G.J.,R.F.Adler,M.M.Morrissey,S.Curtis,R.Joyce B.McGavock,and J.Susskind.2001.“Global Precipitation at One-Degree Daily Resolution from Multi-Satellite Observations.”Journal of Hydrometeorology 2(1):36-50doi:10.1175/1525-7541(2001)002<0036:GPAODD>2.0.CO;2.
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Jeong,J.-H.,B.-M.Kim,C.-H.Ho,and Y.-H.Noh.2008.“Systematic Variation in Wintertime Precipitation in East Asia by MJO-induced Extratropical Vertical Motion.”Journal of Climate 21(4):788-801.doi:10.1175/2007JCLI1801.1.
Kanamitsu,M.,W.Ebisuzaki,J.Woollen,S.Yang,J.J.Hnilo M.Fiorino,and G.L.Potter.2002.“NCEP-DOE AMIP-IReanalysis(R-2).”Bulletin of the American Meteorologica Society 83(11):1631-1643.doi:10.1175/BAMS-83-11-1631.
Park,T.-W.,C.-H.Ho,S.Yang,and J.-H.Jeong.2010.“Influences of Arctic Oscillation and Madden-Julian Oscillation on Cold Surges and Heavy Snowfalls over Korea:A Case Study for the Winter of 2009-2010.”Journal of Geophysical Research Atmospheres 115:D23122.doi:10.1029/2010JD014794.
Song,L.,L.Wang,W.Chen,and Y.Zhang.2016.“Intraseasona Variation of the Strength of the East Asian Trough and Its Climatic Impacts in Boreal Winter.”Journal of Climate 29(7)2557-2577.doi:10.1175/JCLI-D-14-00834.1.
Song,L.,and R.Wu.2017.“Processes for Occurrence of Strong Cold Events over Eastern China.”Journal of Climate 30(22)9247-9266.doi:10.1175/JCLI-D-16-0857.1.
Song,L.,R.Wu,and Y.Jiao.2018.“Relative Contributions of Synoptic and Intraseasonal Variations to Strong Cold Events over Eastern China.”Climate Dynamics 50(11-12)4619-4634.doi:10.1007/s00382-017-3894-4.
Wu,R.2016.“Coupled Intraseasonal Variations in the East Asian Winter Monsoon and the South China Sea-Western North Pacific SST in Boreal Winter.”Climate Dynamics 47(7-8):2039-2057.doi:10.1007/s00382-015-2949-7.
Wu,R.,and Z.Chen.2015.“Intraseasonal SST Variations in the South China Sea during Boreal Winter and Impacts of the East Asian Winter Monsoon.”Journal of Geophysica Research 120(12):5863-5878.doi:10.1002/2015JD023368.
Yang,S.,and T.Li.2016.“Intraseasonal Variability of Air Temperature over the Mid-High Latitude Eurasia in Borea Winter.”Climate Dynamics 47(7-8):2155-2175.doi:10.1007/s00382-015-2956-8.
Yao,S.,Q.Sun,Q.Huang,and P.Chu.2016.“The 10-30-Day Intraseasonal Variation of the East Asian Winter Monsoon The Temperature Mode.”Dynamics of Atmospheres and Oceans 75:91-101.doi:10.1016/j.dynatmoce.2016.07.001.
Ye,K.-H.,and R.Wu.2015.“Contrast of Local Air-Sea Relationship between 10-20-Day and 30-60-Day Intraseasonal Oscillations during May-September over the South China Sea and the Western North Pacific.”Climate Dynamics 45(11-12)3441-3459.doi:10.1007/s00382-015-2549-6.
Cao,X.,and R.Wu.2018.“Origins and Interrelationship of Intraseasonal Rainfall Variations around the Maritime Continent during Boreal Winter.”Theoretical and Applied Climatology 132(1-2):543-554.doi:10.1007/s00704-017-2106-9.
He,J.,H.Lin,and Z.Wu.2011.“Another Look at Influences of the Madden-Julian Oscillation on the Wintertime East Asian Weather.”Journal of Geophysical Research 116:D03109doi:10.1029/2010JD014787.
Huffman,G.J.,R.F.Adler,M.M.Morrissey,S.Curtis,R.Joyce B.McGavock,and J.Susskind.2001.“Global Precipitation at One-Degree Daily Resolution from Multi-Satellite Observations.”Journal of Hydrometeorology 2(1):36-50doi:10.1175/1525-7541(2001)002<0036:GPAODD>2.0.CO;2.
Jeong,J.-H.,C.-H.Ho,B.-M.Kim,and W.-T.Kwon.2005.“Influence of the Madden-Julian Oscillation on Wintertime Surface Air Temperature and Cold Surges in East Asia.”Journal of Geophysical Research 110:D11104.doi:10.1029/2004JD005408
Jeong,J.-H.,B.-M.Kim,C.-H.Ho,and Y.-H.Noh.2008.“Systematic Variation in Wintertime Precipitation in East Asia by MJO-induced Extratropical Vertical Motion.”Journal of Climate 21(4):788-801.doi:10.1175/2007JCLI1801.1.
Kanamitsu,M.,W.Ebisuzaki,J.Woollen,S.Yang,J.J.Hnilo M.Fiorino,and G.L.Potter.2002.“NCEP-DOE AMIP-IReanalysis(R-2).”Bulletin of the American Meteorologica Society 83(11):1631-1643.doi:10.1175/BAMS-83-11-1631.
Park,T.-W.,C.-H.Ho,S.Yang,and J.-H.Jeong.2010.“Influences of Arctic Oscillation and Madden-Julian Oscillation on Cold Surges and Heavy Snowfalls over Korea:A Case Study for the Winter of 2009-2010.”Journal of Geophysical Research Atmospheres 115:D23122.doi:10.1029/2010JD014794.
Song,L.,L.Wang,W.Chen,and Y.Zhang.2016.“Intraseasona Variation of the Strength of the East Asian Trough and Its Climatic Impacts in Boreal Winter.”Journal of Climate 29(7)2557-2577.doi:10.1175/JCLI-D-14-00834.1.
Song,L.,and R.Wu.2017.“Processes for Occurrence of Strong Cold Events over Eastern China.”Journal of Climate 30(22)9247-9266.doi:10.1175/JCLI-D-16-0857.1.
Song,L.,R.Wu,and Y.Jiao.2018.“Relative Contributions of Synoptic and Intraseasonal Variations to Strong Cold Events over Eastern China.”Climate Dynamics 50(11-12)4619-4634.doi:10.1007/s00382-017-3894-4.
Wu,R.2016.“Coupled Intraseasonal Variations in the East Asian Winter Monsoon and the South China Sea-Western North Pacific SST in Boreal Winter.”Climate Dynamics 47(7-8):2039-2057.doi:10.1007/s00382-015-2949-7.
Wu,R.,and Z.Chen.2015.“Intraseasonal SST Variations in the South China Sea during Boreal Winter and Impacts of the East Asian Winter Monsoon.”Journal of Geophysica Research 120(12):5863-5878.doi:10.1002/2015JD023368.
Yang,S.,and T.Li.2016.“Intraseasonal Variability of Air Temperature over the Mid-High Latitude Eurasia in Borea Winter.”Climate Dynamics 47(7-8):2155-2175.doi:10.1007/s00382-015-2956-8.
Yao,S.,Q.Sun,Q.Huang,and P.Chu.2016.“The 10-30-Day Intraseasonal Variation of the East Asian Winter Monsoon The Temperature Mode.”Dynamics of Atmospheres and Oceans 75:91-101.doi:10.1016/j.dynatmoce.2016.07.001.
Ye,K.-H.,and R.Wu.2015.“Contrast of Local Air-Sea Relationship between 10-20-Day and 30-60-Day Intraseasonal Oscillations during May-September over the South China Sea and the Western North Pacific.”Climate Dynamics 45(11-12)3441-3459.doi:10.1007/s00382-015-2549-6.