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Infrared and Laser Engineering
Vol. 50, Issue 6, 20211031 (2021)

Estimation of organic carbon stocks in the East China Sea

Xiaoyu Cui¹, Wentao Xu¹, Qirui Guan¹, Weizhou Luo¹, Minran Li¹, Yudi Zhou¹, Peituo Xu¹, Bin Liu¹, Sunqiang Pan², Chong Liu¹, Qun Liu^1、*, and Dong Liu¹

Author Affiliations

¹College of Optical Science and Engineering, Ningbo Research Institute, Zhejiang University, Hangzhou 310027, China

²Zhejiang Province Institute of Metrology, Hangzhou 310018, China

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DOI: 10.3788/IRLA20211031 Cite this Article

Xiaoyu Cui, Wentao Xu, Qirui Guan, Weizhou Luo, Minran Li, Yudi Zhou, Peituo Xu, Bin Liu, Sunqiang Pan, Chong Liu, Qun Liu, Dong Liu. Estimation of organic carbon stocks in the East China Sea[J]. Infrared and Laser Engineering, 2021, 50(6): 20211031 Copy Citation Text

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Correlations between Rrs(555) and bbp(555) in the East China Sea in the summer of 2010

Fig. 1. Correlations between R_rs(555) and b_bp(555) in the East China Sea in the summer of 2010

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Correlations between POC concentration and bbp(555) in the East China Sea in the summer of 2010

Fig. 2. Correlations between POC concentration and b_bp(555) in the East China Sea in the summer of 2010

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Fig. 3. Correlations between log(c(POC)) and N in the East China Sea in the spring of 2010

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Fig. 4. Comparison of POC concentrations of the results calculated using Two-Step algorithm and the results from Ocean Color

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Fig. 5. Estimation results of surface average DOC concentrations in the East China Sea from 2006 to 2010 by using Eq. (5)

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Fig. 6. Schematic diagram of POC vertical distribution models. (a) Uniform distribution; (b) Exponential distribution; (c) Gaussian distribution; (d) Folding line distribution

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Fig. 7. Schematic diagram of DOC vertical distribution models. (a) Uniform distribution; (b) Stratification distribution

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Fig. 8. Distribution of surface POC concentration in the East China Sea in 2010. (a) Spring; (b) Summer; (c) Autumn; (d) Winter

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Fig. 9. [in Chinese]

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Fig. 9. Distribution of surface DOC concentration in the East China Sea of 2010. (a) Spring; (b) Summer; (c) Autumn; (d) Winter

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Fig. 10. Depth distribution of the euphotic layer in the East China Sea in 2010. (a) Spring; (b) Summer; (c) Autumn; (d) Winter

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Fig. 11. Estimation of POC stocks in the all water columns and the euphotic layer of the East China Sea in 2010

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Fig. 12. Estimation of DOC stocks in the all water columns and the euphotic layer of the East China Sea in 2010

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Fig. 13. Comparison of POC stocks in the all water columns of the East China Sea from 2006 to 2015

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Fig. 14. Comparison of DOC stocks in the all water columns of the East China Sea from 2006 to 2015

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Season	A₁	A₂	A₃	A₄
Spring	1.623	0.0001620	1359	0.3252
Summer	2.109	0.0011860	2607	0.4975
Autumn	1.787	0.0006908	1498	0.3827
Winter	1.705	0.0003317	849.4	0.2668

Table 1. Fitting coefficients of Two-Step algorithm in the four seasons of 2010

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Season	C₁	C₂	C₃	C₄
Spring	0.4530	−0.2363	0.7956	2.4040
Summer	1.9500	0.3512	0.3666	2.4340
Autumn	2.4980	0.8714	0.4702	2.3710
Winter	0.5900	−0.6275	0.6831	2.3480

Table 2. Fitting coefficients of NDCI algorithm in the four seasons of 2010

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Season	NASA	Two-Step			NDCI
Season	c (POC) /10² mg·m⁻³	c (POC) /10² mg·m⁻³	Relative error		c (POC) /10² mg·m⁻³	Relative error
Spring	1.743	1.744	0.02%		1.597	8.38%
Summer	1.160	1.224	5.58%		1.517	30.87%
Autumn	1.390	1.402	0.86%		1.477	6.25%
Winter	1.690	1.646	2.55%		1.412	16.46%

Table 3. Estimation result of surface average POC concentrations in the East China Sea in the four seasons of 2010

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Season	c_v (DOC)/ 10³ mg·m⁻³	c_(Eq.6a)(DOC)/ 10³ mg·m⁻³	c_(Eq.6a)(DOC)/ c_v (DOC)	c_(Eq.6b)(DOC)/ 10³ mg·m⁻³	c_(Eq.6b)(DOC)/ c_v (DOC)
Spring	0.960	0.139	0.145	2.419	2.52
Summer	1.080	0.054	0.05	2.539	2.35
Autumn	0.820	0.086	0.105	2.755	3.36
Winter	0.970	0.114	0.118	2.700	2.78

Table 4. Estimation results of surface average DOC concentrations in the East China Sea in 2010 by using Eq.(6a), Eq.(6b) and the modified algorithm

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Distribution models	Formulas
其中，c(POC)_z表示在深度z处的POC浓度；c(POC)₀为表层或深度为z₀处的POC浓度；k代表POC浓度随深度衰减的速率；z_max为次表层最大值深度；A与σ为次表层最大值发生的幅度与宽度； ${{\textit{z}}_{{\rm{DM}}}}$为下混合层上边界深度；c(POC)_DM为下混合层POC浓度。
Uniform distribution	$c{({\rm{POC)}}_Z} = c{({\rm{POC)}}_0}$
Exponential distribution	$c{({\rm{POC)} }_Z} = c{({\rm{POC)} }_{\rm{0} } }{{\rm e}^{ - k({ {\textit{z} }_0} - {\textit{z} })} }$
Gaussian distribution	$c{({\rm{POC)} }_Z} = c{({\rm{POC)} }_0}\left[ {1 + ({A / {\sigma \sqrt { {\pi / 2} } } }){{\rm e}^{ { { - 2{ {(Z - {Z_{\max } })}^2} } / { {\sigma ^2} } } } } } \right]$
Folding line distribution	$c{({\rm{POC)} }_Z} = c{({\rm{POC)} }_0} - \dfrac{ {(c{ {({\rm{POC)} } }_0} - c{ {({\rm{POC)} } }_{ {\rm{DM} } } }){\textit{z} } } }{ { { {\textit{z} }_{ {\rm{DM} } } } } }$

Table 5. Formulas of four POC vertical distribution models

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Xiaoyu Cui, Wentao Xu, Qirui Guan, Weizhou Luo, Minran Li, Yudi Zhou, Peituo Xu, Bin Liu, Sunqiang Pan, Chong Liu, Qun Liu, Dong Liu. Estimation of organic carbon stocks in the East China Sea[J]. Infrared and Laser Engineering, 2021, 50(6): 20211031

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