指一天内气压高低的周期性变化。在中、低纬度地面气压的日变化、一般有两个高值两个低值。
根据SS - Y伸缩仪的原理，从理论和实际观测分析了气压变化对伸缩应变观测日变曲线的影响及两者间的相关性。
According to the principle of SS-Y tensometer, We analyze the influence and relation of air pressure change toward observational daily change curve of tensometer.
因此认为气压变化是伸缩仪观测日变曲线畸变的主要因素之一。
So, we think air pressure change is one of the main factors of aberration of observational daily change curve of tensometer.
平均本站气压新旧站日变化趋势较一致。相对湿度新站较旧站略偏高；
The change trends of the average pressure in each station are more consistent. Relative humidity of the new station is slightly higher than that of the old station.
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