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Acta Optica Sinica, Volume. 40, Issue 9, 0901001(2020)

Research on Cloud Fraction Inversion Algorithm of Environmental Trace Gas Monitoring Instrument

Taiping Yang1,2, Fuqi Si1、*, Wang Ping3, Yuhan Luo1, Haijin Zhou1, and Minjie Zhao1
Author Affiliations
  • 1Centre of Environmental Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei, Anhui 230031, China
  • 2University of Science and Technology of China, Hefei, Anhui 230026, China
  • 3Royal Netherlands Meteorological Institute, KNMI, De Bilt, 3731GA, The Netherlands
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    AbstractGet PDF(in Chinese)
    Figures&Tables (14)
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    References (26)
    Cited By (8)
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    Figures & Tables(14)
    Flowchart of proposed algorithm

    Fig. 1. Flowchart of proposed algorithm

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    Push-broom diagram of EMI in a nadir

    Fig. 2. Push-broom diagram of EMI in a nadir

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    Examples of O2-O2 DOAS fitting. (a) EMI measured spectrum(dashed line) and reference spectrum(solid line); (b) reference cross section (dashed line) and absorption cross section (solid line) of O2-O2; (c) reference cross section (dashed line) and absorption cross section (solid line) of Ring effect; (d) residual structure fitting

    Fig. 3. Examples of O2-O2 DOAS fitting. (a) EMI measured spectrum(dashed line) and reference spectrum(solid line); (b) reference cross section (dashed line) and absorption cross section (solid line) of O2-O2; (c) reference cross section (dashed line) and absorption cross section (solid line) of Ring effect; (d) residual structure fitting

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    Diagram of independent pixel approximation model

    Fig. 4. Diagram of independent pixel approximation model

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    EMI measured Ns,O2?O2 distribution

    Fig. 5. EMI measured Ns,O2?O2 distribution

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    Difference between simulated and EMI measured O2-O2 VCD

    Fig. 6. Difference between simulated and EMI measured O2-O2 VCD

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    Ns,O2?O2 distribution after correction

    Fig. 7. Ns,O2?O2 distribution after correction

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    EMI measured distribution of cloud fraction

    Fig. 8. EMI measured distribution of cloud fraction

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    OMI measured distribution of cloud fraction

    Fig. 9. OMI measured distribution of cloud fraction

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    Frequency percent distribution of cloud fraction

    Fig. 10. Frequency percent distribution of cloud fraction

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    Correlation analysis of OMI and EMI cloud fraction

    Fig. 11. Correlation analysis of OMI and EMI cloud fraction

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    • Table 1. Parameter settings for O2-O2 DOAS fitting

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      Table 1. Parameter settings for O2-O2 DOAS fitting

      ParameterContent
      Temperature of NO2298 K, 220 K (Vandaele et al, 1996)[24]
      Temperature of O3293 K (Bogumil et al, 2003), 243 K (Bogumil et al, 2000)[25]
      Temperature of O2-O2293 K (Thalman et al, 2013)[26]
      Temperature of H2O297 K (hitran)[27]
      RingRing.exe
      Order of polynomial5
      OffsetConstant (0th order)
      Fitting interval460--490 nm

    • Table 2. Input parameter node settings of radiative transfer model

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      Table 2. Input parameter node settings of radiative transfer model

      ParameterNode
      θSZA/(°)0.1, 7.2, 13.1, 23.1, 33.7, 44.4, 55.3, 65.9, 76.6, 87.1
      θVZA/(°)0.1, 7.2, 13.1, 23.1, 33.7, 44.4, 55.3, 65.9
      θRAA/(°)0, 30, 60, 90, 120, 150, 180
      Surface albedo0, 0.010, 0.025, 0.050, 0.075, 0.100, 0.150, 0.200, 0.250, 0.325, 0.400, 0.500, 0.600, 0.700, 0.800, 0.900, 1.000
      Surface or cloud pressure /hPa1013, 963, 913, 863, 813, 763, 713, 663, 613, 563, 513, 463, 413, 363, 313, 263, 213, 163, 113, 63
      Cloud fraction-0.100, -0.050, 0, 0.010, 0.020, 0.040, 0.060, 0.080, 0.100, 0.125, 0.150, 0.175, 0.200, 0.250, 0.300, 0.350, 0.400, 0.450, 0.500, 0.550, 0.600, 0.650, 0.700, 0.750, 0.800, 0.850, 0.950, 1.000, 1.100, 1.200
      Note: cloud fraction smaller than 0 and larger than 1 is included to enlarge the parameter space.

    • Table 3. Node settings for Rcand Ns,
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      Table 3. Node settings for Rcand Ns,
      ParameterNode
      Rc at 468 nm0, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 1.05, 1.10, 1.15, 1.20, 1.25, 1.50, 1.75, 2.00
      Ns,O2⁃O2 /(1044 molecule2·cm-5)0, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, 0.60, 0.65, 0.70, 0.75, 0.80, 0.85, 0.90, 0.95, 1.00, 1.10, 1.20

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    Taiping Yang, Fuqi Si, Wang Ping, Yuhan Luo, Haijin Zhou, Minjie Zhao. Research on Cloud Fraction Inversion Algorithm of Environmental Trace Gas Monitoring Instrument[J]. Acta Optica Sinica, 2020, 40(9): 0901001

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    Paper Information

    Category: Atmospheric Optics and Oceanic Optics

    Received: Dec. 16, 2019

    Accepted: Jan. 19, 2020

    Published Online: May. 6, 2020

    The Author Email: Fuqi Si (sifuqi@aiofm.ac.cn)

    DOI:10.3788/AOS202040.0901001

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology