A NEW EXPERIMENT ON PREPARING 1000 MB AND 500 MB PROGNOSTIC CHARTS BY GRAPHICAL INTEGRATION

A new method of preparing 1000 mb and 500 mb prognostic charts by graphical integration is proposed. Its main features are:(1) The vertical structure of whole troposphere is taken into consideration. Sawyer-Bushby's model is used in actual computation;but the method can be extended to other models, e.g. Eliassen's model. (2) 500 mb surface is not taken as the. level of non-divergence, which may be placed at other appropriate isobaric surface.The proposed method consists essentially in calculating the height changes of 1000 mb and 500 mb surfaces by means of certain advections on equivalent baroclinic levels defined by Bolin. Some results of the experiment are discussed.