Design and Application of an Unattended Multifunctional H-TDMA System
The hygroscopic properties of aerosols have a signi.cant impact on aerosol particle number size distri-butions (PNSD),formation of cloud condensation nuclei,climate forcing,and atmospheric visibility,as well as human health.To allow for the observation of the hygroscopic growth of aerosols with long-term accuracy,an unattended multifunctional hygroscopicity-tandem differential mobility analyzer (H-TDMA) system was designed and built by the Institute of Tropical and Marine Meteorology (ITMM),China Meteorological Administration (CMA),in Guangzhou,China.The system is capable of measuring dry and wet PNSD,hy-groscopic growth factor by particle size,and mixing states.This article describes in detail the working prin-ciples,components,and calibration methods of the system.Standard polystyrene latex (PSL) spheres with five different diameters were chosen to test the system” s precision and accuracy of particle size measurement.Ammonium sulfate was used to test the hygroscopic response of the system for accurate growth factor mea-surement.The test results show that the deviation of the growth factor measured by the system is within a scope of-0.01 to-0.03 compared to K(o)hler theoretical curves.Results of temperature and humidity control per-formance tests indicate that the system is robust.An internal temperature gradient of less than 0.2 K for a second differential mobility analyzer (DMA2) makes it possible to reach a set-point relative humidity (RH) value of 90% and with a standard deviation of ± 0.44%,sufficient for unattended field observation.
HAOBO TAN HANBING XU QILIN WAN FEI LI XUEJIAO DENG P.W.CHAN DONG XIA YAN YIN
Key Laboratory for Atmospheric Physics and Environment, Nanjing University of Information Science an Sun Yat-sen University, Guangzhou, China Institute of Tropical and Marine Meteorology, China Meteoro1ogical Administration, Guangzhou Hong Kong Observatory, Hong Kong Dongguan Meteorological Bureau,Dongguan Key Laboratory for Atmospheric Physics and Environment,Nanjing University of Information Science and
国内会议
广州
英文
507-523
2014-10-10（万方平台首次上网日期，不代表论文的发表时间）