Remote Sensing Inversion of Concentration of Phytoplankton Chlorophyll and Carotenoid from GOCI Measurements in Coastal Waters

Zhenghao Li; Zhizhao Chen; Liyan Wang; Deyong Sun; Binru Zhao; Shengqiang Wang

doi:10.3788/AOS202141.0201001

Acta Optica Sinica, Volume. 41, Issue 2, 0201001(2021)

Remote Sensing Inversion of Concentration of Phytoplankton Chlorophyll and Carotenoid from GOCI Measurements in Coastal Waters

Zhenghao Li¹, Zhizhao Chen¹, Liyan Wang^3、*, Deyong Sun^1,2、**, Binru Zhao³, and Shengqiang Wang^1,2

Author Affiliations

¹School of Marine Sciences, Nanjing University of Information Science and Technology, Nanjing, Jiangsu 210044, China

²Jiangsu Research Center for Ocean Survey Technology, Nanjing, Jiangsu 210044, China

³National Marine Data and Information Service, Tianjin 300171, China

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Figures & Tables(11)

Fig. 1. Comparison between the estimated and measured pigment concentration. (a) TChl-a; (b) Chl-b; (c) TChl-c; (d) PPC; (e) PSC

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Fig. 2. Comparison between the measured and satellite-derived pigment concentration. (a) TChl-a; (b) Chl-b; (c) TChl-c; (d) PPC; (e) PSC

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Fig. 3. Annual average spatial distribution of pigment concentrations from 2014 to 2018 in Bohai Sea, Yellow Sea and East China Sea. (a) TChl-a; (b) Chl-b; (c) TChl-c; (d) PPC; (e) PSC

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Fig. 4. Monthly average spatial distribution of pigment concentrations from 2014 to 2018 in Bohai Sea, Yellow Sea and East China Sea. (a) TChl-a; (b) Chl-b; (c) TChl-c; (d) PPC; (e) PSC

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Fig. 5. Monthly average distribution of pigment concentrations from 2014 to 2018 in S1--S5. (a) TChl-a; (b) Chl-b; (c) TChl-c; (d) PPC; (e) PSC

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Fig. 6. Relationship of measured pigment concentration between TChl-a and Chl-b, TChl-c, PPC, PSC. (a) TChl-a and Chl-b; (b) TChl-a and TChl-c; (c) TChl-a and PPC; (d) TChl-a and PSC

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Table 1. Species and description of phytoplankton pigmentsunit: mg·m^-3

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Table 1. Species and description of phytoplankton pigmentsunit: mg·m^-3

Symbol	Pigment	Mean±SD
TChl-a	Total Chlorophyll-a^①	1.25±2.17
Chl-b	Chlorophyll-b	0.23±0.36
TChl-c	Total Chlorophyll-c^②	0.17±0.36
PPC	Photoprotective carotenoid pigments^③	0.32±0.49
PSC	Photosynthetic carotenoid pigments^④	0.42±0.96
Note: ① Total Chlorophyll-a=Chlorophyll-a+Divinyl Chlorophyll-a+Chlorophyllide-a;② Total Chlorophyll-c=Chlorophyll-c2+Chlorophyll-c3;③ Photoprotective carotenoid pigments=α-carotene+β-carotene+Zeaxanthin+Alloxanthin+Diadinoxanthin+Diatoxanthin;④ Photosynthetic carotenoid pigments=19'-hexanoyloxyfucoxanthin+19'-butanoyloxyfucoxanthin+Fucoxanthin+Peridinin+Prasinoxanthin.

Table 2. Remote sensing reflectance band combination form in this paper, in which λ_i and λ_j represent the i-th and j-th band of the GOCI R_rs

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Table 2. Remote sensing reflectance band combination form in this paper, in which λ_i and λ_j represent the i-th and j-th band of the GOCI R_rs

X	Band combination form
X₁	R_rs(λ_i)
X₂	lg[R_rs(λ_i)]
X₃	R_rs(λ_i)+R_rs(λ_j)
X₄	R_rs(λ_i)-R_rs(λ_j)
X₅	R_rs(λ_i)/R_rs(λ_j)
X₆	[R_rs(λ_i)-R_rs(λ_j)]/[R_rs(λ_i)/R_rs(λ_j)]
X₇	[R_rs(λ_i)+R_rs(λ_j)]/[R_rs(λ_i)/R_rs(λ_j)]
X₈	[R_rs(λ_i)-R_rs(λ_j)]/[R_rs(λ_i)+R_rs(λ_j)]

Table 3. Optimal band combination and phytoplankton pigment concentration inversion model
View table
Table 3. Optimal band combination and phytoplankton pigment concentration inversion model
Pigment X Model a b R²
TChl-a X₈ a×exp(bX) 0.7158 -8.977 0.85
Chl-b X₈ a×exp(bX) 0.1612 -6.514 0.76
TChl-c X₈ a×exp(bX) 0.1101 -8.556 0.80
PPC X₅ a×X^b 0.2097 -3.209 0.80
PSC X₅ a×X^b 0.2836 -4.102 0.75

Table 4. Mean and standard deviation of the TChl-a, Chl-b, TChl-c, PPC and PSC concentrations in the S1-S5 region in each year from 2014 to 2018

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Table 4. Mean and standard deviation of the TChl-a, Chl-b, TChl-c, PPC and PSC concentrations in the S1-S5 region in each year from 2014 to 2018

Pigment	Station	Mean±SD /(mg·m^-3)
Pigment	Station	2014	2015	2016	2017	2018
	S1	2.326±0.766	2.396±0.805	2.267±0.804	2.856±0.808	2.805±0.801
	S2	1.396±0.862	1.472±0.857	1.491±0.875	1.902±0.884	2.012±0.883
TChl-a	S3	0.685±0.496	0.676±0.473	0.942±0.479	0.948±0.482	1.035±0.479
	S4	1.052±0.408	1.077±0.402	1.274±0.378	1.067±0.389	1.082±0.373
	S5	0.214±0.145	0.247±0.145	0.324±0.146	0.239±0.146	0.314±0.165
	S1	0.374±0.092	0.383±0.096	0.366±0.096	0.432±0.097	0.427±0.096
	S2	0.249±0.122	0.257±0.121	0.262±0.124	0.310±0.125	0.323±0.125
Chl-b	S3	0.146±0.081	0.146±0.078	0.180±0.079	0.183±0.080	0.192±0.079
	S4	0.207±0.064	0.211±0.063	0.238±0.059	0.211±0.061	0.211±0.059
	S5	0.064±0.032	0.071±0.032	0.083±0.033	0.068±0.033	0.079±0.035
	S1	0.338±0.107	0.347±0.112	0.329±0.112	0.410±0.113	0.390±0.111
	S2	0.206±0.123	0.216±0.122	0.219±0.125	0.276±0.126	0.291±0.126
TChl-c	S3	0.104±0.072	0.103±0.069	0.140±0.070	0.142±0.071	0.153±0.070
	S4	0.158±0.059	0.161±0.058	0.189±0.055	0.160±0.057	0.162±0.054
	S5	0.034±0.022	0.039±0.022	0.051±0.023	0.038±0.023	0.049±0.025
	S1	0.484±0.123	0.495±0.125	0.473±0.124	0.56±0.126	0.500±0.124
	S2	0.323±0.157	0.332±0.156	0.339±0.159	0.402±0.161	0.418±0.161
PPC	S3	0.189±0.104	0.190±0.101	0.234±0.102	0.237±0.103	0.250±0.102
	S4	0.268±0.082	0.273±0.081	0.308±0.076	0.274±0.079	0.273±0.075
	S5	0.083±0.042	0.092±0.043	0.108±0.043	0.088±0.043	0.102±0.025
	S1	0.836±0.258	0.860±0.270	0.816±0.271	1.012±0.272	0.863±0.269
	S2	0.515±0.300	0.540±0.299	0.548±0.305	0.686±0.308	0.723±0.308
PSC	S3	0.265±0.180	0.263±0.172	0.355±0.174	0.357±0.175	0.391±0.174
	S4	0.399±0.146	0.408±0.144	0.476±0.135	0.406±0.139	0.409±0.133
	S5	0.091±0.058	0.104±0.058	0.132±0.059	0.100±0.059	0.127±0.065

Table 5. Comparison of inversion results of pigment covariation relationship model and R_rs inversion model

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Table 5. Comparison of inversion results of pigment covariation relationship model and R_rs inversion model

Model type	Pigment	R²	MAPE /%	ME /%	RMSE /(mg·m^-3)
	Chl-b	0.67	66.94	41.36	0.224
Pigment covariation relationship(From measured TChl-a concentration)	TChl-c	0.89	42.26	29.62	0.237
	PPC	0.83	34.69	25.15	0.206
	PSC	0.91	42.25	34.37	0.392
	Chl-b	0.56	86.39	53.49	0.271
Pigment covariation relationship(From measured R_rs)	TChl-c	0.74	75.68	61.19	0.239
	PPC	0.69	80.48	64.33	0.356
	PSC	0.76	80.36	69.41	0.764
	Chl-b	0.72	78.07	48.44	0.153
R_rs inversion model	TChl-c	0.79	78.99	57.51	0.171
	PPC	0.77	69.81	50.03	0.224
	PSC	0.80	81.74	61.01	0.435

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Zhenghao Li, Zhizhao Chen, Liyan Wang, Deyong Sun, Binru Zhao, Shengqiang Wang. Remote Sensing Inversion of Concentration of Phytoplankton Chlorophyll and Carotenoid from GOCI Measurements in Coastal Waters[J]. Acta Optica Sinica, 2021, 41(2): 0201001

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Paper Information

Category: Atmospheric Optics and Oceanic Optics

Received: May. 15, 2020

Accepted: Aug. 12, 2020

Published Online: Feb. 27, 2021

The Author Email: Wang Liyan (wly_smile@163.com), Sun Deyong (sundeyong@nuist.edu.cn)

DOI:10.3788/AOS202141.0201001

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laser devices and laser physics

Lasers and Laser Optics

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Instrumentation, Measurement and Metrology

Table 1. Species and description of phytoplankton pigmentsunit: mg·m-3

Table 1. Species and description of phytoplankton pigmentsunit: mg·m-3

Table 2. Remote sensing reflectance band combination form in this paper, in which λi and λj represent the i-th and j-th band of the GOCI Rrs

Table 2. Remote sensing reflectance band combination form in this paper, in which λi and λj represent the i-th and j-th band of the GOCI Rrs

Table 3. Optimal band combination and phytoplankton pigment concentration inversion model

Table 3. Optimal band combination and phytoplankton pigment concentration inversion model

Table 4. Mean and standard deviation of the TChl-a, Chl-b, TChl-c, PPC and PSC concentrations in the S1-S5 region in each year from 2014 to 2018

Table 4. Mean and standard deviation of the TChl-a, Chl-b, TChl-c, PPC and PSC concentrations in the S1-S5 region in each year from 2014 to 2018

Table 5. Comparison of inversion results of pigment covariation relationship model and Rrs inversion model

Table 5. Comparison of inversion results of pigment covariation relationship model and Rrs inversion model

Table 1. Species and description of phytoplankton pigmentsunit: mg·m^-3

Table 1. Species and description of phytoplankton pigmentsunit: mg·m^-3

Table 2. Remote sensing reflectance band combination form in this paper, in which λ_i and λ_j represent the i-th and j-th band of the GOCI R_rs

Table 2. Remote sensing reflectance band combination form in this paper, in which λ_i and λ_j represent the i-th and j-th band of the GOCI R_rs

Table 5. Comparison of inversion results of pigment covariation relationship model and R_rs inversion model

Table 5. Comparison of inversion results of pigment covariation relationship model and R_rs inversion model