研究目的
To study the vertical features of the neutral atmosphere including temperature, wind, clouds, aerosols, greenhouse gases, pollutant gases, and water vapor conditions by developing a terahertz superconducting radiometric spectrometer (TSRS) system.
研究成果
The TSRS system successfully demonstrated real-time observation of atmospheric molecular emission lines with high spectral resolution. The system's deployment at high altitude and its integration with APSOS provide valuable data for studying the vertical distribution of ozone and other atmospheric parameters. Future work includes optimizing observation procedures and further system improvements.
研究不足
The system's performance is affected by atmospheric conditions, particularly water vapor absorption. The mechanical vibration from the GM refrigerator and the need for frequent calibration are also limitations.
1：Experimental Design and Method Selection:
A dual-band heterodyne receiver system based on high sensitive superconductor-insulator-superconductor (SIS) mixers covering the frequency range of 180 to 380 GHz was developed. Fast Fourier transform spectrometer (FFTS) was used for real-time observation of atmospheric molecular emission lines.
2：Sample Selection and Data Sources:
Atmospheric molecular emission lines around 236 GHz and 358 GHz were monitored at Yangbajing site, Qinghai-Tibet Plateau.
3：List of Experimental Equipment and Materials:
SIS mixers, FFTS, LO based on solid-state multiplier-amplifier chain, Gifford-McMahon (GM) refrigerator, and various control units.
4：Experimental Procedures and Operational Workflow:
The system was integrated, tested, and optimized before deployment. Observations included skydip processes, calibration with hot and cold loads, and zenith atmosphere observation.
5：Data Analysis Methods:
Brightness temperature of zenith atmosphere was calculated from observed power spectral densities and calibration parameters. Zenith opacity was obtained by fitting observed data.
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