中国东部海域浮游植物类群遥感反演研究

赵海阳; 沈芳; 孙雪融; 魏小岛

doi:10.12284/hyxb2022062

中国东部海域浮游植物类群遥感反演研究

doi: 10.12284/hyxb2022062

1.
华东师范大学河口海岸学国家重点实验室，上海 200241
2.
华东师范大学崇明生态研究院，上海 202162

基金项目: 国家自然科学基金（42076187，41771378）。

详细信息

作者简介:
赵海阳（1997-），男，河南省许昌市人，主要从事海洋水色遥感研究。E-mail: 51193904013@stu.ecnu.edu.cn

通讯作者:
沈芳，女，教授，主要从事海洋水色遥感研究。E-mail: fshen@sklec.ecnu.edu.cn

中图分类号: TP79
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出版历程
- 收稿日期: 2021-08-17
- 修回日期: 2021-11-20
- 刊出日期: 2022-04-14

Remote sensing retrieval of phytoplankton group in the eastern China seas

1.
State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China
2.
Institute of Eco-Chongming, East China Normal University, Shanghai 202162, China

摘要

摘要: 浮游植物类群遥感反演能够为全面认识浮游植物在海洋生态系统中的作用提供重要的数据资料。但由于复杂的水体光学特性，近海浮游植物类群遥感反演存在着巨大挑战。本研究以复杂光学二类水体—中国东部海域为研究区，通过使用3种建模方法，即波段组合法、基于奇异值分解的多元线性回归法、基于奇异值分解的XGBoost回归法，利用遥感反射率数据反演浮游植物类群。经原位实测数据集验证，基于奇异值分解的XGBoost回归法构建的8类浮游植物叶绿素a浓度反演模型的精度最高，其中硅藻、甲藻的叶绿素a浓度反演模型在验证集上的决定系数均大于0.7。相比之下，3种建模方法估算得到的绿藻、蓝藻和金藻的叶绿素a浓度精度较低（验证结果的决定系数小于0.45）。同时，研究评估了OLCI影像的3种大气校正方法（C2RCC、POLYMER、MUMM）在中国东部海域的适用性。结果显示，相对于其他两种大气校正算法，C2RCC在各波段有较好的表现（均方根误差小于0.004 8 sr⁻¹）。将3种浮游植物类群反演模型应用到大气校正后的OLCI影像，验证结果显示，利用基于奇异值分解的多元线性回归法建立的硅藻叶绿素a浓度模型有较好的反演精度（决定系数为0.56）。
- 中国东部海域 /
- 浮游植物类群 /
- 遥感反演 /
- OLCI /
- 大气校正
Abstract: Remote sensing retrieval of phytoplankton group can provide important data for a comprehensive understanding of the role of phytoplankton in marine ecosystem. However, due to the complex optical characteristics, there are still great challenges in the remote sensing retrieval of phytoplankton group in offshore waters. In this study, the eastern China seas region, a complex optical class II water body, is taken as the research area. By using three modeling methods, namely band combination method, multiple linear regression method based on singular value decomposition (SVD+MLR) and XGBoost regression method based on singular value decomposition (SVD+XGBoost), the phytoplankton group is retrieved from remote sensing reflectance (R_rs) data. Verified by the in-situ measured data set, the chlorophyll a (Chl a) concentration retrieval model of eight phytoplankton groups by SVD+XGBoost has the highest accuracy, and the determination coefficient (R²) of Chl a concentration inversion model of diatoms and dinoflagellates in the validation set is greater than 0.7. In contrast, the accuracy of Chl a concentration of chlorophytes, cyanobacteria and chrysophytes estimated by the three modeling methods is low (the R² of the validation results is less than 0.45). At the same time, the applicability of three atmospheric correction methods of OLCI images (C2RCC, POLYMER and MUMM) in the eastern China seas is evaluated. The results show that compared with the other two atmospheric correction algorithms, C2RCC has better performance in each band (root mean square error is less than 0.0048 sr⁻¹). Finally, the performance of the retrieval model on satellite images is verified by the in-situ data. The validation results show that the diatoms Chl a concentration model established by SVD+MLR has better accuracy (the R² is 0.56), while the Chl a concentration inversion models of other phytoplankton groups have poor results.
- eastern China seas /
- phytoplankton group /
- remote sensing retrieval /
- OLCI /
- atmospheric correction

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图 1 研究区位置以及采样站位

Fig. 1 Location of the study area and sampling stations

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图 2 基于奇异值分解的浮游植物类群Chl a浓度反演算法流程

F表示本研究中使用的回归模型，即为多元线性回归模型或XGBoost回归模型

Fig. 2 Flow chart of Chl a concentration inversion algorithm of phytoplankton groups based on singular value decomposition

F represents the regression model used in this study, such as the multiple linear regression model or XGBoost regression model

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图 3 3种大气校正方法获得的遥感反射率与实测遥感反射率验证结果

Fig. 3 Validation of remote sensing reflectance obtained by three atmospheric correction methods with in-situ remote sensing reflectance

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图 4 基于波段组合法建立的8类浮游植物叶绿素a浓度反演模型的验证结果（叶绿素a浓度单位：mg/m³）

Fig. 4 Validation results of Chl a concentration inversion model of eight phytoplankton groups based on band combination method (the unit of Chl a concentration is mg/m³)

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图 5 基于SVD+MLR建立的8类浮游植物叶绿素a浓度反演模型的验证结果（叶绿素a浓度单位：mg/m³）

Fig. 5 Validation results of Chl a concentration inversion model of eight phytoplankton groups based on SVD+MLR method (the unit of Chl a concentration is mg/m³)

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图 6 基于SVD+XGBoost建立的8类浮游植物叶绿素a浓度反演模型的验证结果（叶绿素a浓度单位：mg/m³）

Fig. 6 Validation results of Chl a concentration inversion model of eight phytoplankton groups based on SVD+XGBoost method (the unit of Chl a concentration is mg/m³)

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图 7 基于波段组合法的浮游植物类群叶绿素a浓度卫星反演验证（叶绿素a浓度单位：mg/m³）

Fig. 7 Validation of satellite inversion results of phytoplankton group Chl a concentration based on band combination method (the unit of Chl a concentration is mg/m³)

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图 9 基于SVD+XGBoost的浮游植物类群叶绿素a浓度卫星反演验证（叶绿素a浓度单位：mg/m³）

Fig. 9 Validation of satellite inversion results of phytoplankton group Chl a concentration based on SVD+XGBoost method (the unit of Chl a concentration is mg/m³)

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图 8 基于SVD+MLR的浮游植物类群叶绿素a浓度卫星反演验证（叶绿素a浓度单位：mg/m³）

Fig. 8 Validation of satellite inversion results of phytoplankton group Chl a concentration based on SVD+MLR method (the unit of Chl a concentration is mg/m³)

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图 10 2020年5月和2020年8月中国东部海域硅藻叶绿素a浓度空间分布

Fig. 10 The spatial distribution of diatom Chl a concentration in the eastern China seas in May 2020 and August 2020

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表 1 本研究采用的波段组合形式

Tab. 1 The band combinations used in this study

序号	波段（B）组合形式	序号	波段（B）组合形式
BC₁	$ {B}_{i}+{B}_{j} $	BC₆	$\dfrac{ {B}_{i}-{B}_{j} }{ {B}_{k} }$
BC₂	$ {B}_{i}-{B}_{j} $	BC₇	$\dfrac{ {B}_{i} }{ {B}_{j}+{B}_{k} }$
BC₃	$ {B}_{i}\times {B}_{j} $	BC₈	$\dfrac{ {B}_{i} }{ {B}_{j}-{B}_{k} }$
BC₄	$ {B}_{i}/{B}_{j} $	BC₉	${B}_{i}\times \left(\dfrac{1}{ {B}_{j} }+\dfrac{1}{ {B}_{k} }\right)$
BC₅	$\dfrac{ {B}_{i}+{B}_{j} }{ {B}_{k} }$	BC₁₀	${B}_{i}\times \left(\dfrac{1}{ {B}_{j} }-\dfrac{1}{ {B}_{k} }\right)$

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表 2 8类浮游植物叶绿素a浓度统计特征

Tab. 2 Statistical characteristics of Chl a concentration of eight phytoplankton groups

浮游植物	站位数（N）	平均值/ （mg∙m⁻³）	标准差/ （mg∙m⁻³）	最大值/ （mg∙m⁻³）
青绿藻	450	0.15	0.27	4.45
甲藻	380	0.29	0.89	10.91
隐藻	410	0.17	0.22	1.31
绿藻	216	0.22	0.77	7.45
蓝藻	465	0.24	0.68	9.85
硅藻	446	1.13	2.10	15.23
金藻	360	0.11	0.23	2.51
定鞭藻	458	0.08	0.14	1.74

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表 3 3种大气校正算法的精度评价

Tab. 3 Accuracy evaluation of three atmospheric correction algorithms

波长/nm	RMSE/（10⁻³ sr⁻¹）			MAE/（10⁻³ sr⁻¹）			MAPE/%
波长/nm	C2RCC	POLYMER	MUMM	C2RCC	POLYMER	MUMM	C2RCC	POLYMER	MUMM
400	4.13	4.41	10.79	3.21	3.67	9.83	41	44	213
412.5	3.99	4.36	7.68	3.01	3.53	6.69	36	41	141
442.5	4.10	4.64	6.81	3.21	3.68	6.02	36	39	140
490	4.79	4.97	4.90	3.74	3.82	4.43	40	37	89
510	4.72	5.28	4.21	3.65	4.12	3.74	40	41	70
560	4.34	5.31	3.53	3.31	4.03	3.04	33	43	56
620	3.22	4.21	3.05	2.24	3.21	2.44	49	66	81
665	3.21	3.75	2.71	2.21	2.82	2.05	61	72	84
673.75	3.23	3.64	2.62	2.29	2.72	1.98	63	71	80
681.25	3.21	3.64	2.60	2.29	2.75	1.91	64	73	83
708.75	3.12	4.45	3.21	2.21	3.62	1.93	70	116	69
753.75	3.21	3.24	2.38	2.30	2.40	1.49	88	94	81
778.75	3.04	3.23	2.40	2.18	2.40	1.44	86	99	90

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表 4 8类浮游植物叶绿素a浓度反演模型使用的波段组合形式及回归方程

Tab. 4 Band combinations form and regression equations used in Chl a concentration inversion model of eight phytoplankton groups

浮游植物	波段组合	与Chl a浓度对数的相关系数	回归方程
青绿藻	${X=\dfrac{ {R}_{{\rm{rs}}}\left(442.5\right)+{R}_{{\rm{rs}}}\left(620\right)}{ {R}_{{\rm{rs}}}\left(560\right)}}$	0.53	${ \mathrm{l}\mathrm{g}C_P=-0.74X+0.09 }$
甲藻	${X=\dfrac{ {R}_{{\rm{rs}}}\left(442.5\right)}{ {R}_{{\rm{rs}}}\left(510\right)}-\dfrac{ {R}_{{\rm{rs}}}\left(442.5\right)}{ {R}_{{\rm{rs}}}\left(560\right)}}$	0.54	${ \mathrm{l}\mathrm{g}C_P=-7.83{X}^{3}-0.21{X}^{2}+3.97X-1.05 }$
隐藻	${X=\dfrac{ {R}_{{\rm{rs}}}\left(442.5\right)+{R}_{{\rm{rs}}}\left(490\right)}{ {R}_{{\rm{rs}}}\left(510\right)}}$	0.61	${ \mathrm{l}\mathrm{g}C_P=-2.10X+2.87} $
绿藻	${X=\dfrac{ {R}_{{\rm{rs}}}\left(560\right)}{ {R}_{{\rm{rs}}}\left(442.5\right)-{R}_{{\rm{rs}}}\left(620\right)}}$	0.37	${ \mathrm{l}\mathrm{g}C_P=2.2\times 1{0}^{-4}{X}^{2}-3.8\times {10}^{-2}{X}-1.25 }$
蓝藻	${X=\dfrac{ {R}_{{\rm{rs}}}\left(412.5\right)}{ {R}_{{\rm{rs}}}\left(442.5\right)-{R}_{{\rm{rs}}}\left(620\right)}}$	0.40	${ \mathrm{l}\mathrm{g}C_P=-0.006X-0.951 }$
硅藻	${X=\dfrac{ {R}_{{\rm{rs}}}\left(490\right)+{R}_{{\rm{rs}}}\left(620\right)}{ {R}_{{\rm{rs}}}\left(560\right)}}$	0.76	$ {\mathrm{l}\mathrm{g}C_P=-1.93X+2.75} $
金藻	$ {X={R}_{{\rm{rs}}}\left(665\right)-{R}_{{\rm{rs}}}\left(673.75\right) }$	0.34	${ \mathrm{l}\mathrm{g}C_P=-477\;853.92{X}^{2}-1\;569.03X-1.46 }$
定鞭藻	${X=\dfrac{ {R}_{{\rm{rs}}}\left(490\right)-{R}_{{\rm{rs}}}\left(510\right)}{ {R}_{{\rm{rs}}}\left(560\right)}}$	0.42	${ \mathrm{l}\mathrm{g}C_P=-2.143X-1.285} $

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表 5 8类浮游植物叶绿素a浓度遥感反演模型的精度评价

Tab. 5 Accuracy of inversion model for Chl a concentration of eight phytoplankton groups

浮游植物类群	建模方法	R²	MAE	RMSE	MAPE/%
青绿藻	BC	0.29	0.33	0.44	29
	SVD+MLR	0.38	0.33	0.42	33
	SVD+XGBoost	0.47	0.30	0.38	26
甲藻	BC	0.31	0.63	0.76	40
	SVD+MLR	0.42	0.62	0.69	52
	SVD+XGBoost	0.77	0.34	0.44	24
隐藻	BC	0.31	0.48	0.60	41
	SVD+MLR	0.43	0.42	0.55	25
	SVD+XGBoost	0.49	0.38	0.52	29
绿藻	BC	0.13	0.68	0.80	46
	SVD+MLR	−0.06	0.77	0.89	56
	SVD+XGBoost	0.32	0.56	0.71	26
蓝藻	BC	0.15	0.35	0.52	24
	SVD+MLR	0.06	0.39	0.55	29
	SVD+XGBoost	0.44	0.31	0.43	21
硅藻	BC	0.55	0.41	0.57	71
	SVD+MLR	0.64	0.39	0.52	63
	SVD+XGBoost	0.73	0.32	0.45	48
金藻	BC	−0.03	0.54	0.71	27
	SVD+MLR	0.06	0.52	0.68	27
	SVD+XGBoost	0.36	0.46	0.56	25
定鞭藻	BC	0.14	0.37	0.46	24
	SVD+MLR	0.37	0.32	0.40	20
	SVD+XGBoost	0.51	0.26	0.35	13

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