The ground-based Atmospheric Emitted Radiance Interferometer(AERI)was deployed in Shouxian,China in 2008 to measure down-welling infrared radiances with high resolution.Based on AERI observations,we propose a new meth...The ground-based Atmospheric Emitted Radiance Interferometer(AERI)was deployed in Shouxian,China in 2008 to measure down-welling infrared radiances with high resolution.Based on AERI observations,we propose a new method for retrieving vertical temperature and water vapor profiles in the planetary boundary layer(PBL).The method exclusively uses NCEP-2,a global reanalysis data as a first-guess profile in an iterative recursive algorithm.The PBL profiles of temperature and moisture under clear sky conditions in Shouxian have been retrieved using this new method.Compared with coincident radiosonde measurements,we find that AERI is able to obtain more accurate temperature and water vapor profiles in the PBL.The retrieval results with high temporal resolution can be used to monitor the PBL stability and evolution.展开更多
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 c...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.展开更多
基金supported by the Chinese Academy of Sciences(XDA05040300)the External Cooperation Program of the Chinese Academy of Sciences(GJHZ1207)
文摘The ground-based Atmospheric Emitted Radiance Interferometer(AERI)was deployed in Shouxian,China in 2008 to measure down-welling infrared radiances with high resolution.Based on AERI observations,we propose a new method for retrieving vertical temperature and water vapor profiles in the planetary boundary layer(PBL).The method exclusively uses NCEP-2,a global reanalysis data as a first-guess profile in an iterative recursive algorithm.The PBL profiles of temperature and moisture under clear sky conditions in Shouxian have been retrieved using this new method.Compared with coincident radiosonde measurements,we find that AERI is able to obtain more accurate temperature and water vapor profiles in the PBL.The retrieval results with high temporal resolution can be used to monitor the PBL stability and evolution.
基金supported by the National Natural Science Foundation of China (Grant Nos. 41505024 & 41127901)
文摘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.
