Ground-Based IDOAS De-Striping by Weighted Unidirectional Variation

Liang XI; Fu-qi SI; Yu JIANG; Hai-jin ZHOU; Xiao-han QIU; Zhen CHANG

doi:10.3964/j.issn.1000-0593(2022)02-0627-07

Journals >Spectroscopy and Spectral Analysis >Volume 42 >Issue 2 >Page 627 > Article

Spectroscopy and Spectral Analysis
Vol. 42, Issue 2, 627 (2022)

Ground-Based IDOAS De-Striping by Weighted Unidirectional Variation

Liang XI^{1; 2;}, Fu-qi SI^{1; *;}, Yu JIANG^1;, Hai-jin ZHOU^1;, Xiao-han QIU^1;, and Zhen CHANG^1;

Author Affiliations

1. Anhui Institute of Optics and Fine Mechanics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China

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DOI: 10.3964/j.issn.1000-0593(2022)02-0627-07 Cite this Article

Liang XI, Fu-qi SI, Yu JIANG, Hai-jin ZHOU, Xiao-han QIU, Zhen CHANG. Ground-Based IDOAS De-Striping by Weighted Unidirectional Variation[J]. Spectroscopy and Spectral Analysis, 2022, 42(2): 627 Copy Citation Text

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Fig. 1. Scheme of ground-based IDOAS instrument

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A set of patlerns observed by ground-based IDOAS observations(a): DN values at 360 nm; (b): Weight matrix; (c): NO2 columns; (d): SO2 columns; (e): Vertical gradient of NO2 columns; (f): Vertical gradient of SO2 columns; (g): Horizontal gradient of NO2 columns; (h): Horizontal gradient of SO2 columns

Fig. 2. A set of patlerns observed by ground-based IDOAS observations
(a): DN values at 360 nm; (b): Weight matrix; (c): NO₂ columns; (d): SO₂ columns; (e): Vertical gradient of NO₂ columns; (f): Vertical gradient of SO₂ columns; (g): Horizontal gradient of NO₂ columns; (h): Horizontal gradient of SO₂ columns

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Fig. 3. Different simulated stripes and de-striping results
(a): Periodic position, sparse; (b): Periodic position, dense; (c): Periodic position+random position, partial;(d): Periodic position+random position, multi-line; (b), (d), (f), (h) are de-striping results of (a), (c), (e), (g)

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Fig. 4. Two groups of NO₂ and SO₂ observing and de-striping results in the Leshan experiment
(a): NO₂columns, started at 12:59; (c): SO₂ columns, started at 12:59; (e): NO₂ columns, started at 13:14;(g): SO₂ columns, started at 13:14; (b), (d), (f), (h) are de-striping results of (a), (c), (e), (g)

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Fig. 5. Weighted mean cross-track profiles of NO₂ and SO₂ results before and after de-striping
(a): NO₂, started at 12:59; (b): SO₂, started at 12:59; (c): NO₂, started at 13:14; (d): SO₂, started at 13:14

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Index	Case a	Case b	Case c	Case d
IF	18.435 2	25.876 4	22.636 2	23.187 8
PSNR	48.403 0	47.545 9	45.285 5	46.745 2
SSIM	0.999 7	0.999 6	0.999 3	0.999 5
MAE	0.246 0	0.370 3	0.488 0	0.430 1

Table 1. Quantitative assessment of simulated data

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Parameter	NO₂	SO₂
Fit interval	340~370 nm	308~320 nm
Polynomial term	Order 5	Order 3
Offset	Order 0	Order 0
Cross sections
NO₂	Vandaele et al., 298 K	Vandaele et al., 298 K
O₃	Serdyuchenko et al., 223 K	Serdyuchenko et al., 223 K
O₄	Thalman and Volkamer, 293 K	×
SO₂	×	Vandaele et al, 298 K
Ring	Chance and Spurr	Chance and Spurr

Table 2. Main analysis parameters for NO₂ and SO₂ DOAS retrievals

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	Original	De-striped
Case a	1.37	1.05
Case b	1.30	1.09
Case c	1.35	1.06
Case d	1.16	1.02

Table 3. γ values before and after de-striping

Liang XI, Fu-qi SI, Yu JIANG, Hai-jin ZHOU, Xiao-han QIU, Zhen CHANG. Ground-Based IDOAS De-Striping by Weighted Unidirectional Variation[J]. Spectroscopy and Spectral Analysis, 2022, 42(2): 627

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