Principal Modes of Summertime Zonal-Mean Flow and Their Connections with the AO and ENSO |
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| Authors: | BAI Yingying and GUAN Zhaoyong |
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| Institution: | [1]KLME, School of Atmospheric Sciences, Nanjing University of Information Science and Technology, Nanjing 210044 [2]Chongqing Institute of Meteorological Sciences, Chongqing 401147 |
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| Abstract: | The NCEP/NCAR reanalysis data have been employed to diagnose variations of the zonal mean flow in boreal summer.Two leading EOF modes are found to dominate the spatial and temporal changes of the summertime zonal mean winds in the troposphere.EOF1 shows the distribution of zonal-mean flow anomalies with higher variance in the North Polar Region,whereas the EOF2 shows the distribution of zonal-mean flow anomalies with higher variance in tropical and extra-tropical regions.The EOF1 and EOF2 have respectively ... |
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| Keywords: | boreal summer zonal-mean flow Arctic Oscillation (AO) ENSO Eliassen-Palm flux (E-P flux) |
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