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Pass by more detection, city center and suburb sea-level ir pressure bad the absolute value exist the variety regulation of the season of"winter big, the spring autumn time it, summer minimum", and the day of"in the daytime not obvious, the nighttime show Zhao" change "the city barometric marsh land effect" of regulation, that effect is result in barometric difference in the two sides of in addition to the elevation height is different outside of another important reason.

After comparison, the city centre and the outskirts of absolute sea-level air pressure difference there is a "winter, spring and autumn followed, the summer minimum" changes of the season, and "not obvious during the day and night significantly" on the changes of the "City of pressure depression "The effect is caused by air pressure difference between the two places apart from the altitude differences of another important reason.