气压脉动仪及湍流大气中的气压脉动频谱特征研究

基于自制气压脉动仪在内蒙古科尔沁地区大气边界层与大气环境综合实验站2019年夏季的观测资料,计算气压脉动特征参数,分析气压频谱及气压标准差特征.结果表明,自制气压脉动仪能够反映气压的快速变化,频率响应接近1 Hz;气压脉动方差谱曲线在0.0006～0.5 Hz的频率范围内满足n?2标度率,峰值频率低于风速和温度;不同稳...

Research on the Fast-Response Air Pressure Sensor and SpectralCharacteristics of the Pressure Fluctuations in the Turbulent Atmosphere

Based on the observational data of a self-developed fast-response air pressure sensor at the Atmospheric Boundary Layer and Atmospheric Environment Comprehensive Experimental Station in the Horqin area, Inner Mongolia in the summer of 2019, the characteristic parameters of the pressure fluctuations were calculated, and the spectral characteristics of the pressure fluctuations and the characteristics of the pressure standard deviation were studied. The results show that the self-developed fast-response air pressure sensor can reflect the rapid fluctuations of pressure, and the frequency response is close to 1 Hz. The variance spectra of the pressure fluctuations satisfy the n^-2 scaling law in the frequency range from 0.0006 to 0.5 Hz, and the peak frequency is lower than that of the wind speed and temperature. The normalized variance spectra of pressure fluctuations under different atmospheric stabilities merge into a single line in the high-frequency range and distribute around the stability parameter in the low-frequency range. The contribution of pressure fluctuations to turbulent energy is mainly at larger scales, while that of the wind speed and temperature is mainly at smaller scales. The standard deviation and fluctuation intensity of the pressure have obvious diurnal variation characteristics, which is strong during the daytime and weak during the nighttime.