Terahertz band simulations using two different radiative transfer models
- 19 Downloads
A high-resolution dual-band terahertz (THz) radiometer was designed to measure vertical distributions of chemical elements in the middle atmosphere of the Tibetan Plateau. A forward simulation, which always should be conducted firstly for the development of a matching retrieval algorithm, has not been done before. We use two radiative transfer models, ARTS and AM, to simulate the water vapor, ozone and carbon monoxide spectra on the plateau based on the spectral design of the THz radiometer. The emission line characteristics of the three gases in this spectral band are identified. Reasons for the differences in the spectral simulations between the two models are analyzed for individual gases. The impact of several different spectral parameter settings on the simulations are evaluated through a series of sensitivity experiments. This study suggests that the ARTS is more suitable for the development of the THz radiometer retrieval algorithm. An optimal parameter setting of the ARTS for the three elements are given.
KeywordsTerahertz radiation Radiometer Radiative transfer model Spectral simulation Plateau
Unable to display preview. Download preview PDF.
This work was supported by the National Natural Science Foundation of China (Grant Nos. 41505024 & 41127901).
- Anderson G P, Chetwynd J H, Clough S A, Shettle E P, Kneizys F X. 1986. AFGL atmospheric constituent profiles (0–120 km). Environmental Research Papers, No. 954, AFGL-TR-86-01110Google Scholar
- Buehler S A, Eriksson P. 2017. ARTS Theory. ARTS version 2.3.897Google Scholar
- Buehler S A, Defer E, Evans F, Eliasson S, Mendrok J, Eriksson P, Lee C, Jiménez C, Prigent C, Crewell S, Kasai Y, Bennartz R, Gasiewski A J. 2012. Observing ice clouds in the submillimeter spectral range: The CloudIce mission proposal for ESA’s Earth Explorer 8. Atmos Meas Tech, 5: 1529–1549CrossRefGoogle Scholar
- de Lange A, Birk A M, de Lange G, Friedl-Vallon F, Kiselev O, Koshelets V, Maucher G, Oelhaf H, Selig A, Vogt P, Wagner G, Landgraf J. 2011. HCl and ClO in activated Arctic air; first retrieved vertical profiles from TELIS submillimetre limb spectra. Atmos Meas Tech Discuss, 4: 6497–6537CrossRefGoogle Scholar
- Li X X, Paine S, Yao Q J, Shi S C, Matsuo H, Yang J, Zhang Q Z. 2009. A Fourier transform spectrometer for site testing at Dome A. Proc. SPIE, 7385Google Scholar
- Liebe H J, Layton D H. 1987. Millimeter-wave properties of the atmosphere: Laboratory studies and propagation modelling. Technical Report 87224. U.S. Dept. of Commerce, National Telecommunications and Information Administration, Institute for Communication SciencesGoogle Scholar
- Liebe H J, Hufford G A, Cotton M G. 1993. Propagation modeling of moist air and suspended water/ice particles at frequencies below 1000 GHz. In AGARD 52nd Specialists Meeting of the Electromagnetic Wave Propagation Panel, Palma de Mallorca, SpainGoogle Scholar
- Matsuo Hiroshi. 2010. Far-Infrared interferometry from Antarctica. International Symposium on space Terahertz Technology, OxfordGoogle Scholar
- Melsheimer C, Verdes C, Buehler S A, Emde C, Eriksson P, Feist D G, Ichizawa S, John V O, Kasai Y, Kopp G, Koulev N, Kuhn T, Lemke O, Ochiai S, Schreier F, Sreerekha T R, Suzuki M, Takahashi C, Tsujimaru S, Urban J. 2005. Intercomparison of general purpose clear sky atmospheric radiative transfer models for the millimeter/submillimeter spectral range. Radio Sci, 40: RS1007CrossRefGoogle Scholar
- Nagahama T, Nakane H, Fujinuma Y, Ogawa H, Mizuno A, Fukui Y. 2003. A semiannual variation of ozone in the middle mesosphere observed with the millimeter-wave radiometer at Tsukuba, Japan. J Geophys Res, 108: 4684Google Scholar
- Paine S. 2018. The am atmospheric model. SMA technical memo #152 (version 10.0)Google Scholar
- Rosenkranz P W. 1993. Absorption of microwaves by atmospheric gases. In: Janssen M A, ed. Atmospheric Remote Sensing by Microwave Radiometry. Hoboken: John Wiley & Sons, Inc. 37–90Google Scholar