自动与人工观测的气压差异分析

Difference between automatic and manual air pressure observations

利用陕西省97个气象站2004—2007年间自动与人工平行观测期间的资料,分析了陕西和陕西不同地域人工与自动观测气压的差异并对气压月、年平均值进行了显著性检验。结果表明:人工观测比自动观测日平均气压平均偏高0.21 hPa,标准差为0.30 hPa;气压差值有明显的地域特征;气压对比差值的日、月变化规律明显;DYYZ和CAWS系列测压仪的性能没有明显差异;自动与人工观测时间不同步对定时值有一定影响,但对气候分析没有影响;校准值随时间漂移是气压传感器的主要误差源之一;自动站所测气压可与人工站气压连续使用。

The comparative data of air pressure at manual and automatic observation at 97 weather stations in 2004,2005,2007 are used to analyze the difference between the two systems in Shaanxi and different areas of Shaanxi.The result indicates that daily average air pressure of manual observation is 0.21 hPa higher than the automatic one and the standard deviation is 0.30 hPa.There is obvious difference among different areas.However,there is no obvious difference between DYYZ and CAWS instrument.Daily and monthly variety regulation is obvious.The time difference between automatic recording and manual observation has certain influence on hourly data but has no influence on climate analysis.The calibration value drifting is the main error for pressure sensor.The pressure data recorded by automatic stations can be continuously used with manual one.