Infrared and Laser Engineering, Volume. 50, Issue 6, 20211031(2021)
Estimation of organic carbon stocks in the East China Sea
Figures & Tables(20)
Fig. 1. Correlations between
Fig. 2. Correlations between POC concentration and
Fig. 3. Correlations between log(
Fig. 4. Comparison of POC concentrations of the results calculated using Two-Step algorithm and the results from Ocean Color
Fig. 5. Estimation results of surface average DOC concentrations in the East China Sea from 2006 to 2010 by using Eq. (5)
Fig. 6. Schematic diagram of POC vertical distribution models. (a) Uniform distribution; (b) Exponential distribution; (c) Gaussian distribution; (d) Folding line distribution
Fig. 7. Schematic diagram of DOC vertical distribution models. (a) Uniform distribution; (b) Stratification distribution
Fig. 8. Distribution of surface POC concentration in the East China Sea in 2010. (a) Spring; (b) Summer; (c) Autumn; (d) Winter
Fig. 9. Distribution of surface DOC concentration in the East China Sea of 2010. (a) Spring; (b) Summer; (c) Autumn; (d) Winter
Fig. 10. Depth distribution of the euphotic layer in the East China Sea in 2010. (a) Spring; (b) Summer; (c) Autumn; (d) Winter
Fig. 11. Estimation of POC stocks in the all water columns and the euphotic layer of the East China Sea in 2010
Fig. 12. Estimation of DOC stocks in the all water columns and the euphotic layer of the East China Sea in 2010
Fig. 13. Comparison of POC stocks in the all water columns of the East China Sea from 2006 to 2015
Fig. 14. Comparison of DOC stocks in the all water columns of the East China Sea from 2006 to 2015
Table 1. Fitting coefficients of Two-Step algorithm in the four seasons of 2010
View tableView in ArticleTable 1. Fitting coefficients of Two-Step algorithm in the four seasons of 2010
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 2. Fitting coefficients of NDCI algorithm in the four seasons of 2010
View tableView in ArticleTable 2. Fitting coefficients of NDCI algorithm in the four seasons of 2010
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 3. Estimation result of surface average POC concentrations in the East China Sea in the four seasons of 2010
View tableView in ArticleTable 3. Estimation result of surface average POC concentrations in the East China Sea in the four seasons of 2010
Season NASA Two-Step NDCI 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 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
View tableView in ArticleTable 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
Season cv (DOC)/ 103 mg·m−3 c(Eq.6a)(DOC)/ 103 mg·m−3 c(Eq.6a)(DOC)/ cv (DOC) c(Eq.6b)(DOC)/ 103 mg·m−3 c(Eq.6b)(DOC)/ cv (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 5. Formulas of four POC vertical distribution models
View tableView in ArticleTable 5. Formulas of four POC vertical distribution models
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；zmax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； ${{\textit{z}}_{{\rm{DM}}}}$ 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 $c{({\rm{POC)} }_Z} = c{({\rm{POC)} }_0} - \dfrac{ {(c{ {({\rm{POC)} } }_0} - c{ {({\rm{POC)} } }_{ {\rm{DM} } } }){\textit{z} } } }{ { { {\textit{z} }_{ {\rm{DM} } } } } }$
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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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Received: May. 6, 2021
Accepted: --
Published Online: Aug. 19, 2021
The Author Email: Liu Qun (liuqun@zju.edu.cn)
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