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

957 Words Jun 7th, 2016 4 Pages
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 correction schemes (e.g., Standard NIR correction, Iterative NIR correction, and SWIR correction) were tested first to find a suitable correction scheme for the VIIRS imagery in low to moderately turbid Apalachicola Bay. The iterative NIR correction performed well, and validation showed a good correlation (R2 = 0.95, N = 25) against in situ light measurements. A VIIRS-based CDOM algorithm was developed (R2 = 0.87, N = 9), and validated (R2 = 0.76, N = 20, RMSE = 0.29 m-1) against in situ observations. Subsequently, ag412 was used as a proxy of DOC in March (DOC = 1.08 + 0.94 × ag412, R2 = 0.88, N = 13) and in November (DOC = 1.61 + 1.33 × ag412, R2 = 0.83, N = 24) to derive DOC maps that provided synoptic views of DOC distribution, sources, and…

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