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| 1 | First observation of tropospheric nitrogen dioxide from the Environmental Trace Gases Monitoring Instrument onboard the GaoFen-5 satellite显示文摘The Environmental Trace Gases Monitoring Instrument(EMI)is the first Chinese satellite-borne UV–Vis spectrometer aiming to measure the distribution of atmospheric trace gases on a global scale.The EMI instrument onboard the GaoFen-5 satellite was launched on 9 May 2018.In this paper,we present the tropospheric nitrogen dioxide(NO2)vertical column density(VCD)retrieval algorithm dedicated to EMI measurement.We report the first successful retrieval of tropospheric NO_(2) VCD from the EMI instrument.Our retrieval improved the original EMI NO_(2) prototype algorithm by modifying the settings of the spectral fit and air mass factor calculations to account for the on-orbit instrumental performance changes.The retrieved EMI NO_(2) VCDs generally show good spatiotemporal agreement with the satellite-borne Ozone Monitoring Instrument and TROPOspheric Monitoring Instrument(correlation coefficient R of ~0.9,bias<50%).A comparison with ground-based MAX-DOAS(Multi-Axis Differential Optical Absorption Spectroscopy)observations also shows good correlation with an R of 0.82.The results indicate that the EMI NO_(2) retrieval algorithm derives reliable and precise results,and this algorithm can feasibly produce stable operational products that can contribute to global air pollution monitoring. | Chengxin Zhang Cheng Liu Ka Lok Chan Qihou Hu Haoran Liu Bo Li Chengzhi Xing Wei Tan Haijin Zhou Fuqi Si Jianguo Liu | 2020 | Light(Science & Applications)2020，9，1： | 11 |
| 2 | Non-dispersive infrared in-strument based on gas filter correlation technology for atmosphere monitoring显示文摘 | Si Fuqi Liu Jianguo Liu Wenqing | | Chinese Journal Of Quantum Electronics0，21，4： | 1 |
| 3 | Effect of spectral resolution on the measurement of monoaromatic hydrocarbons by DOAS显示文摘有低得多的运作的费用和能力的优秀反应特征和察觉敏感使微分光吸收光谱学( DOAS )成为在某单音的芳族烃( MAHC )的异构体之间区别一个强大的工具由于化学结构的类似跟踪 MAHCs.But 的集中变化,那些 MAHC 有类似的重叠典型吸收结构,它使仪器的参数的选择批评到精确察觉 MAHCs.Firstly ,光谱在 DOAS 系统使用的分辨率决定 O2 的非线性的吸收和典型吸收结构的集体依赖;从而,它为察觉在大气的系列决定 O2 吸收的 ehmination 错误的效果 MAHCs.Secondly ,光谱分辨率决定在在汽车工业和光谱的重叠的干扰使用的技术溶剂代表主要成分的 12 MAHC 的微分吸收特征。第三,光谱分辨率决定敏感,时间决定和线性范围。那么光谱有到噪音的信号的最好的比率的分辨率范围被用来决定最合适光谱分辨率范围,以及光谱分辨率变化保证 MAHC 的典型吸收结构和 O2 吸收干扰的 rninimization。最后, 0.15-0.16 nm (在半最大值的 FWHM:full 宽度) 被假定接近最佳光谱分辨率和它被 DOAS 被 MAHC 的实际测量的结果证实。 | PENG Fumin XIE Pinhua ZHANG Yinghua ZHU Yanwu SI Fuqi LIU Wenqing WANG Junde | 2008 | Journal of Environmental Sciences2008，20，5： | 1 |
| 4 | Observations of stratospheric ozone above Ny-?lesund in the Arctic, 2010–2011显示文摘Stratosphere ozone depletion above the Arctic region has drawn increased attention recently. Here we present stratospheric ozone column densities above Ny-?lesund in the Arctic during summer 2010 and 2011, based on a self-developed passive differential optical absorption spectroscopy(DOAS) technique. By analyzing the received scattered solar spectrum, daily variations of ozone vertical column densities(VCDs) were obtained and correlated with satellite-borne ozone monitoring results and ozone sonde data. The comparisons showed good correlation, confirming the feasibility of DOAS in high-latitude Arctic regions. The preliminary analysis also demonstrated that abnormal low-level ozone columns found in spring 2011 had negative impacts on total ozone column densities over the entire year. The loss of stratospheric ozone may be correlated with low stratospheric temperatures, where heterogeneous atmospheric reactions were active. | LUO Yuhan SI Fuqi LIU Wenqing SUN Liguang LIU Yi | 2015 | Advances in Polar Science2015，26，3： | 0 |
| 5 | A Statistical Algorithm for Retrieving Background Value of Absorbing Aerosol Index Based on TROPOMI Measurements显示文摘The ultraviolet aerosol index(UVAI) is essential for monitoring the absorbing aerosols during aerosol events. UVAI depends on the absorbing aerosol concentration, the viewing geometry, and the temporal drift of radiometric sensitivity. To efficiently detect absorbing aerosols with the highest precision and to improve the accuracy of long-term UVAI estimates,the background UVAI must be examined through the UVAI retrieval. This study presents a statistical method that calculates the background value of UVAI using TROPOspheric Monitoring Instrument(TROPOMI) observation data over the Pacific Ocean under clear-sky scenes. Radiative transfer calculations were performed to simulate the dependence of UVAI on aerosol type and viewing geometry. We firstly applied the background UVAI to reducing the effects of viewing geometry and the degradation of the TROPOMI irradiance measurements on the UVAI. The temporal variability of the background UVAI under the same viewing geometry and aerosol concentration was identified. Radiative transfer calculations were performed to study the changes in background UVAI using Aerosol Optical Depth from the Moderate Resolution Imaging Spectroradiometer(MODIS) and reflectance measurements from TROPOMI as input. The trends of the temporal variations in the background UVAI agreed with the simulations. Alterations in the background UVAI expressed the reflectance variations driven by the changes in satellite state. Decreasing trends in solar irradiance at 340 and 380 nm due to instrument degradation were identified. Our findings are valuable because they can be applied to future retrievals of UVAI from the Environmental Trace Gases Monitoring Instrument(EMI) onboard the Chinese GaoFen-5 satellite. | Fuying TANG Weihe WANG Fuqi SI Haijin ZHOU Yuhan LUO Dongshang YANG Yuanyuan QIAN | 2023 | Advances in Atmospheric Sciences2023，40，6： | 0 |
| 6 | Preliminary measurements of boundary layer reactive halogens based on MAXDOAS technique over Salt Lake in West China显示文摘The reactive halogens play key roles in the destruction of boundary layer ozone by catalytic reactions and provide a fast pathway to the sedimentation of elemental gaseous mercury.The presence of bromine oxides in the | LUO Yuhan SI Fuqi DOU Ke ZHOU Haijin XIE Pinhua | 2014 | Acta Geologica Sinica(English Edition)2014，88，S1： | 0 |
| 7 | Three-Year Observations of Ozone Columns over Polar Vortex Edge Area above West Antarctica显示文摘Ozone vertical column densities(VCDs)were retrieved by Zenith Scattered Light-Differential Optical Absorption Spectroscopy(ZSL-DOAS)from January 2017 to February 2020 over Fildes Peninsula,West Antarctica(62.22°S,58.96°W).Each year,ozone VCDs started to decline around July with a comparable gradient around 1.4 Dobson Units(DU)per day,then dropped to their lowest levels in September and October,when ozone holes appeared(less than 220 DU).Daily mean values of retrieved ozone VCDs were compared with Ozone Monitoring Instrument(OMI)and Global Ozone Monitoring Experiment 2(GOME-2)satellite observations and the Modern-Era Retrospective analysis for Research and Applications Version 2(MERRA-2)reanalysis dataset,with correlation coefficients(R2)of 0.86,0.94,and 0.90,respectively.To better understand the causes of ozone depletion,the retrieved ozone VCDs,temperature,and potential vorticity(PV)at certain altitudes were analyzed.The profiles of ozone and PV were positively correlated during their fluctuations,which indicates that the polar vortex has a strong influence on stratospheric ozone depletion during Antarctic spring.Located at the edge of polar vortex,the observed data will provide a basis for further analysis and prediction of the inter-annual variations of stratospheric ozone in the future. | Yuanyuan QIAN Yuhan LUO Fuqi SI Taiping YANG Dongshang YANG | 2021 | Advances in Atmospheric Sciences2021，38，7： | 0 |
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