| 冬季中东急流中心位置的年际变化及其与大气环流的联系 |
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| 引用本文： | 吴玲玲,段俊毅.冬季中东急流中心位置的年际变化及其与大气环流的联系[J].大气科学学报,2022,45(1):65-75. |
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| 作者姓名： | 吴玲玲 段俊毅 |
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| 作者单位： | 南京铁道职业技术学院, 江苏 南京 210031 |
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| 基金项目： | 国家自然科学基金资助项目（41205035）；江苏省高等学校自然科学研究项目（18KJB170008）；江苏高校“青蓝工程”资助；南京铁道职业技术学院校“青蓝工程”资助；南京铁道职业技术学院校级重点课题（YR19008） |
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| 摘 要： | 利用NCEP/DOE再分析资料,通过EOF分解、合成分析和线性回归等多种统计学方法,对年际时间尺度上冬季中东副热带西风急流(Middle East subtropical westerly Jet stream,MEJ)中心位置的变化进行研究,分析了MEJ中心位置的年际变化与大气环流的联系,找到了与MEJ中心位置相联系...
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| 关 键 词： | 中东急流 中心位置 东大西洋遥相关 地中海辐合 |
| 收稿时间： | 2021/8/17 0:00:00 |
| 修稿时间： | 2021/11/15 0:00:00 |
Interannual variation of wintertime Middle East subtropical westerly jet stream core location and its relation with atmospheric circulation |
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| WU Lingling,DUAN Junyi.Interannual variation of wintertime Middle East subtropical westerly jet stream core location and its relation with atmospheric circulation[J].大气科学学报,2022,45(1):65-75. |
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| Authors: | WU Lingling DUAN Junyi |
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| Institution: | Nanjing Institute of Railway Technology, Nanjing 210031, China |
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| Abstract: | By using of National Centers for Environmental Prediction/Department of Energy reanalysis data,through some statistical methods,such as empirical orthogonal function analysis,composite analysis,regression analysis,we research the variation of wintertime Middle East subtropical westerly Jet stream (MEJ) core location based on the interannual time scale.The link between the interannual variations of MEJ core location and the atmospheric circulation is studied,and the critical circulation factors associated with the interannual variations of MEJ core location are found out.The east-west movement of the MEJ core is very pronounced.MEJ core extends from 17.5°E to 67.5°E,which spans 50 longitudes in the east-west direction.MEJ core''s location shows apparent interannual variation features.There is closed relation between the variation of MEJ core location and East Atlantic teleconnection (EA) and Mediterranean Convergence (MC) anomaly.When EA is robust,negative 200 hPa geopotential height anomaly occurs in the middle and high latitudes of the North Atlantic,and positive anomaly exists in the subtropical North Atlantic,northern Africa,and southern Europe.The geopotential height anomaly distribution with positive in the south and negative in the north makes the 200 hPa zonal wind at the western MEJ axis week under direct dynamical effect.Furthermore,through Ekman pumping to bring secondary circulation,the anomalous geopotential height with positive EA phase produces convergence wind anomaly in the Mediterranean Sea at the high level of troposphere,which strengthens MC with a positive anomalous vorticity source in the Mediterranean.Eastward propagating Rossby wave activities along Asian-African subtropical westerly jet motivated by vorticity source are anomalous,making the zonal wind at the eastern MEJ axis strong under the interaction of current flow and wave.The above process shows the indirect effect of EA on MEJ.Under the joint influence of EA and MC anomaly,200 hPa zonal wind weakens at the west part of the MEJ axis and strengthens at the east part,which makes MEJ core eastward movement.Vice versa.Moreover,besides the EA''s effect,other atmospheric circulation factors in middle and high latitudes maybe impact the MC anomaly. |
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| Keywords: | Middle East subtropical westerly jet stream core location East Atlantic teleconnection Mediterranean convergence |
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