Modeling the spatio-temporal dissolved organic carbon concentration in Barra Bonita reservoir using OLI/Landsat-8 images
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Through exchange of heat between the water and the atmosphere inland waters affect climate at the regional scale and play an important role in the global carbon cycle. Therefore, there is a need to develop methods and models for mapping inland water carbon content to understand the role of lakes in the global carbon cycle. The colored dissolved organic matter (CDOM) has a strong correlation with dissolved organic carbon (DOC) and can be studied using remote sensed images. In this work, we developed an empirical model to estimate the DOC concentration by using the absorption coefficient of CDOM (a CDOM). The a CDOM was estimated through band ratio index and validated with in situ data. The empirically adjusted model to estimate the DOC was applied to a series of OLI/Landsat-8 images. The results showed a good relationship between the a CDOM at 412 nm (a CDOM412) and the ratio between OLI band 1 and OLI band 3, but the validation results showed a normalized root mean square error (NRMSE) of about 37.89%. The a CDOM412 obtained in laboratory was used to establish a relationship between a CDOM412 and DOC. The DOC spatial distribution was then obtained and the concentration varied from 22 to 52 mg.l−1 during the year of 2014.
KeywordsCarbon content Inland water Bio-optical model And cascading reservoirs
The authors thank to São Paulo Research Foundation-FAPESP (Projects numbers: 2012/19821-1 and 2015/21586-9) and National Counsel of Technological and Scientific Development - CNPq (Projects numbers: 400881/2013-6 and 472131/2012-5) for financial support.
- Adler-Golden SM, Matthew MW, Bernstein LS, Levine RY, Berk A, Richtsmeier SC, Acharya PK, Anderson GP, Felde G, Gardner J, Hoke M, Jeong S, Pukall B, Ratkowski A, Burke HH (1999) Atmospheric correction for shortwave spectral imagery based on MODTRAN4. In: SPIE Proceedings, Imaging Spectrometry. 3753:61–69Google Scholar
- Hoge FE, Lyon PE (2002) Satellite observation of chromophoric dissolved organic matter (CDOM) variability in the wake of hurricanes and typhons. Geophys Res Lett 29Google Scholar
- Mueller JL (2003) In-water radiometric profile measurements and data analysis protocols. In: Mueller JL, Fargion GS, McClain CR (eds) Ocean optics protocols for satellite ocean color sensor validation, Revision 4, Volume III: radiometric measurements and data analysis protocols. NASA Goddard Space Flight Space Center: Greenbelt, Maryland, USA, NASA/TM-2003-21621/Rev-Vol. III, pp7–20Google Scholar
- Toming K, Tuvikene L, Vilbaste S, Agasild H, Kisand A, Viik M, Martma T, Jones R, Nõges T (2013) Contributions of autochthonous and allochthonous sources to dissolved organic matter in a large, shallow, eutrophic lake with a highly calcareous catchment. Limnol Oceanogr 58:1259–1270CrossRefGoogle Scholar