Abstract
Four atmospheric cells, Hadley cell, Ferrel cell, polar cell and walker cell, was introduced and latest trends of Hadley cell and Walker cell was given in this paper. From previous studies, a significant intensification of the Hadley cell is shown statistically by the National Centers for Environmental Prediction-National Center for Atmospheric Reasearch(NCEP/NCAR), NCEP1 and the European Center for Medium-Range Weather Forecast(ECMWF) Re-analyses(ERA40). In contrast, no clear change in the period is shown in the NCEP2 reanalysis while great differences of the structure of the Hadley cell from ECMWF and NCEP/NCAR reanalyses are shown. A poleward expansion and strong weakening of the Hadley cell was found given the increased greenhouse gas(GHG) forcing. the inhomogeneous sea surface temperature(SST) change has become the most important factor on interannual timescales. The stronger Hadley cell will happen when the more central Pacific El Niño events happen. The stronger the Walker cell is, the more frequently the eastern Pacific El Niño events occur. In this paper, the changes of the cells under global warming are discussed. Global warming may cause the width of the Hadley cell to increase, exacerbating global warming in turn. Stronger Walker cell lead El Niño happens more frequently, doing harm to agriculture production
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