Seasonal and Regional Variations of Long-Term Changes in Upper-Tropospheric Jets from Reanalyses
作者： Gloria L. Manney , Michaela I. Hegglin
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摘要: AbstractLong-term changes in upper tropospheric jet latitude, altitude, and strength are assessed using five modern reanalyses, MERRA MERRA-2, ERA-Interim, JRA-55, NCEP-CFSR. Changes computed from locations evaluated daily at each longitude to analyze regional seasonal variations. The subtropical polar (eddy-driven) jets separately. Good agreement among the reanalyses many regions seasons provides confidence robustness of diagnosed trends. Jet shifts show strong variations, resulting that not robust zonal or annual means. Robust indicate tropical widening over Africa except during northern hemisphere (NH) spring, narrowing eastern Pacific NH winter. Southern Hemisphere (SH) shows a poleward shift, while equatorward most regions/seasons. Both altitudes typically increase; t...
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