The Role Of Estuarine Carbon Fluxes On Improving Estimate Of The Global Carbon Budgets

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Understanding the role of estuarine-carbon fluxes is essential to improve estimates of the global carbon budgets. Dissolved organic matter (DOM) properties, including chromophoric dissolved organic matter absorption coefficient (ag412) and dissolved organic carbon (DOC) concentrations were examined in Apalachicola Bay, a National Estuarine Research Reserve located in the northeast Gulf of Mexico using in situ and satellite observations during spring and fall, 2015. Synoptic and accurate representation of estuarine-scale processes using satellite ocean color imagery necessitates the removal of atmospheric contribution (~90%) to the signal received by the satellite sensor to successfully link to in situ observations. Three atmospheric…show more content…
Several allochthonous and autochthonous sources, such as microbial activities (McCarthy et al. 1998), atmospheric diffusion (Jurado et al. 2008), ground water and rivers (Hedges et al. 1992; Jaffé et al. 2004), and bottom sediments (Hansell and Carlson 2014), add approximately 15 Pg to 25 Pg of DOM to the oceans (Bauer and Bianchi 2011). The roles of allochthonous and autochthonous DOC have been widely studied using the field observations for investigating the source and sink processes, examining the spatial and temporal distributions, and estimating estuarine-DOC transport to adjacent coastal waters in various regions of the globe (Bianchi et al. 2009; Fellman et al. 2009; Fichot and Benner 2011, 2014; Huguet et al. 2009; Moyer et al. 2015; Osburn et al. 2015; Osburn and Stedmon 2011; Sleighter and Hatcher 2008; Vantrepotte et al. 2015). Although in situ observations have been widely used, they provide limited spatial and temporal coverage. Satellite remote sensing with its synoptic and repeated coverage over large regions could enhance monitoring of estuarine-DOC for better understanding of the role of estuaries in the global carbon cycle (Bauer et al. 2013; Borges et al. 2005). Chromophoric dissolved organic matter (CDOM) is an optically-active fraction of the DOM pool that is characterized by increasing light-absorption towards the UV-visible wavelengths

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