Home   About the Journal   中文界面
WINTERTIME MIDDLE EAST SUBTROPICAL WESTERLY JET STREAM INTERANNUAL VARIATION CHARACTERISTICS AND ITS POSSIBLE PHYSICAL FACTORS
  Revised:September 29, 2017
KeyWords:Middle East subtropical westerly jet stream  axis position  intensity  atmospheric circulation
Fund:
Author NameAffiliationE-mail
WU Ling-ling 1. Key Laboratory of Meteorological Disaster, Ministry of Education (KLME) / Joint International Research Laboratory of Climate and Environment Change (ILCEC) / Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science & Technology, Nanjing 210044 China; 2. Department of Social Sciences, Nanjing Institute of Railway Technology, Nanjing 210031 China; 3. School of Mathematics and Statistics, Nanjing University of Information Science & Technology, Nanjing 210044 China  
ZHANG Jian-wei   
DENG Wei-tao  nimmjy@nuist.edu.cn 
NI Dong-hong   
Hits: 371
Download times: 
Abstract:
      Using National Centers for Environmental Prediction/Department of Energy (NCEP/DOE) monthly reanalysis data and an extended reconstruction of the sea surface temperature data provided by National Oceanic and Atmospheric Administration, the basic characteristics of the interannual variation in the wintertime Middle East subtropical westerly jet stream (MEJ) and its possible physical factors are studied. The results show that the climatological mean MEJ axis extends southwestward-northeastward and that its center lies in the northwest part of the Arabian Peninsula. The south-north shift of the MEJ axis and its intensity show obvious interannual variations that are closely related to the El Ni?o-Southern Oscillation (ENSO) and the mid-high latitude atmospheric circulation. The zonal symmetric response of the Asian jet to the ENSO-related tropical convective forcing causes the MEJ axis shift, and the Arctic Oscillation (AO) causes the middle-western MEJ axis shift. Due to the influences of both the zonal symmetric response of the Asian jet to the ENSO-related tropical convective forcing and the dynamical role of the AO, an east-west out-of-phase MEJ axis shift is observed. Furthermore, the zonal asymmetric response to the ENSO-related tropical convective forcing can lead to an anomalous Mediterranean convergence (MC) in the high troposphere. The MC anomaly excites a zonal wave train along the Afro-Asian jet, which causes the middle-western MEJ axis shift. Under the effects of both the zonal symmetric response to the ENSO-related tropical convective forcing and the wave train along the Afro-Asian jet excited by the MC anomaly, an east-west in-phase MEJ axis shift pattern is expressed. Finally, the AO affects the MEJ intensity, whereas the East Atlantic (EA) teleconnection influences the middle-western MEJ intensity. Under the dynamical roles of the AO and EA, the change in the MEJ intensity is demonstrated.
DOI:10.16555/j.1006-8775.2017.04.004
View Full Text  View/Add Comment  Download reader
      Copyright:Journal of Tropical Meteorology Editorial Office
Address:6 Fu Jin Road Guangzhou   Postcode:510080   Tel:020-87675987   Fax:020-87675987
Technical support: Beijing E-Tiller Co.,Ltd.