Production of chromophoric dissolved organic matter from mangrove leaf litter and floating Sargassum colonies

Shank, Gregory; Lee, Rosalynn; Vähätalo, Anssi V.; Zepp, Richard G.; Bartels, Erich

doi:10.1016/j.marchem.2010.02.002

Cited by 52 publications

(32 citation statements)

References 55 publications

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“…The percent contribution of FDOM spikes varied with season, with higher and more consistent mangrove DOC contributions observed during the T time-series compared to D&W time-series. This supports previous research reporting higher CDOM production during wet periods compared to dry periods (Shank et al, 2010). However, the magnitude of these FDOM spikes infer that the majority of mangrove DOC export into the river during ebb tide (estimated at 65% for SRS-6, Romigh et al, 2006) occurs at rapid time-scales (1-2 h).…”

Section: Mangrove Contributions To the Doc Poolsupporting

confidence: 89%

“…As sea level rise drives higher saltwater intrusion and increased inundation in this region, higher C loss from the mangrove forest (See also Section Mangrove Contributions to the DOC Pool) is expected to account for a larger portion of the Shark River DOC pool and increase outwelling of mangrovederived DOC (Dittmar and Lara, 2001). Such processes are expected to increase light attenuation in the water column (Ganju et al, 2014) of adjacent light-sensitive seagrass and coral reef communities (Shank et al, 2010;McPherson et al, 2011) through long-range DOC transport (Maie et al, 2012;Yamashita et al, 2013. However, DOC export from this region in general is predicted to decrease in the future due to shifting hydrology due to climate change (Regier et al, 2016).…”

Section: Tidal-scale Fdom Dynamicsmentioning

confidence: 99%

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Short-Term Dissolved Organic Carbon Dynamics Reflect Tidal, Water Management, and Precipitation Patterns in a Subtropical Estuary

Regier

Jaffé

2016

Front. Mar. Sci.

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Estuaries significantly impact the global carbon cycle by regulating the exchange of organic matter, primarily in the form of dissolved organic carbon (DOC), between terrestrial and marine carbon pools. Estuarine DOC dynamics are complex as tides and other hydrological and climatic drivers can affect carbon fluxes on short and long time scales. While estuarine and coastal DOC dynamics have been well-studied, variations on short time scales are less well-constrained. Recent advancements in sonde technology enable autonomous in situ collection of high frequency DOC data using fluorescent dissolved organic matter (FDOM) as a proxy, dramatically improving our capacity to characterize rapid changes in DOC, even in remote ecosystems. This study utilizes high-frequency FDOM measurements to untangle rapid and complex hydrologic drivers of DOC in the Shark River estuary, the main drainage of Everglades National Park, Florida. Non-conservative mixing of FDOM along the salinity gradient suggested mangrove inputs accounted for 6% of the total DOC pool. Average changes in FDOM concentrations through individual tidal cycles ranged from less than 10% to greater than 50% and multi-day trends >100% change in FDOM concentration were observed. Salinity and water level both inversely correlated to FDOM at sub-hourly and daily resolutions, while freshwater controls via precipitation and water management were observed at diel to monthly time-scales. In particular, the role of water management in rapidly shifting estuarine salinity gradients and DOC export regimes at sub-weekly time-scales was evident. Additionally, sub-hourly spikes in ebb tide FDOM indicated rapid exchange of DOC between mangrove sediments and the river channel. DOC fluxes calculated from high-resolution FDOM measurements were compared to monthly DOC measurements with high-resolution fluxes considerably improving accuracy of fluxes (thereby constraining carbon budgets). This study provides a better understanding of short-term DOC dynamics and associated hydrological drivers and indicates the importance of high-frequency measurements to accurately constrain coastal carbon processes and budgets, particularly in coastal systems increasingly altered by hydrologic restoration and climate change.

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Section: Mangrove Contributions To the Doc Poolsupporting

confidence: 89%

Section: Tidal-scale Fdom Dynamicsmentioning

confidence: 99%

Short-Term Dissolved Organic Carbon Dynamics Reflect Tidal, Water Management, and Precipitation Patterns in a Subtropical Estuary

Regier

Jaffé

2016

Front. Mar. Sci.

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“…However, the major fraction of CDOM in the open ocean has been 7208 Y. Yamashita et al: Photobleaching as a factor controlling spectral characteristics of CDOM considered to be produced autochthonously through various biological processes Steinberg et al 2004;Ortega-Retuerta et al, 2009;Shank et al, 2010), and the primary local source of CDOM has been assigned to microbial activity Yamashita and Tanoue, 2004). From the global distribution of CDOM, microbially produced CDOM has been considered biologically refractory components with the time scale of the thermohaline circulation (Nelson et al, 2007(Nelson et al, , 2010Yamashita and Tanoue, 2008;Swan et al, 2009), and thus, CDOM has been suggested as a tracer of deep ocean biogeochemical processes and circulation (Nelson et al, 2007(Nelson et al, , 2010.…”

Section: Introductionmentioning

confidence: 99%

Photobleaching as a factor controlling spectral characteristics of chromophoric dissolved organic matter in open ocean

et al. 2013

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Abstract. Chromophoric dissolved organic matter (CDOM) ubiquitously occurs in marine environments and plays a significant role in the marine biogeochemical cycles. Basin scale distributions of CDOM have recently been surveyed in the global ocean and indicate that quantity and quality of oceanic CDOM are mainly controlled by in situ production and photobleaching. However, factors controlling the spectral parameters of CDOM in the UV region, i.e., spectral slope of CDOM determined at 275-295 nm (S 275−295 ) and the ratio of two spectral slope parameters (S R ); the ratio of S 275−295 to S 350−400 , have not been well documented. To evaluate the factor controlling the spectral characteristics of CDOM in the UV region in the open ocean, we determined the quantitative and qualitative characteristics of CDOM in the subarctic and subtropical surface waters (5-300 m) of the western North Pacific. Absorption coefficients at 320 nm in the subarctic region were higher than those in the subtropical region throughout surface waters, suggesting that magnitudes of photobleaching were different between the two regions. The values of S 275−295 and S R were also higher in the subtropical region than the subarctic region. The dark microbial incubation showed biodegradation of DOM little affected S 275−295 , but slightly decreased S R . On the other hand, increases in S 275−295 and relative stableness of S R were observed during photo-irradiation incubations respectively. These experimental results indicated that photobleaching of CDOM mainly induced qualitative differences in CDOM at UV region between the subarctic and subtropical surface waters. The results of this study imply that S 275−295 can be used as a tracer of photochemical history of CDOM in the open ocean.

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“…The percent contribution of FDOM spikes varied with season, with higher and more consistent mangrove DOC contributions observed during the T time-series compared to D&W time-series. This supports previous research reporting higher CDOM production during wet periods compared to dry periods (Shank et al 2010). However, the magnitude of these FDOM spikes infer that the majority of mangrove DOC export into the river during ebb tide (estimated at 65% for SRS-6, )) occurs at rapid time-scales (1-2 hours).…”

Section: Mangrove Contributions To the Doc Poolsupporting

confidence: 89%

“…As sea level rise drives higher saltwater intrusion and increased inundation in this region, higher C loss from the mangrove forest (see also Section 4.5.2) is expected to account for a larger portion of the Shark River DOC pool and increase outwelling of mangrove-derived DOC . Such processes are expected to increase light attenuation in the water column ) of adjacent light-sensitive seagrass and coral reef communities (McPherson et al 2011, Shank et al 2010) through long-range DOC transport Yamashita et al 2013. However, DOC export from this region in general is predicted to decrease in the future due to shifting hydrology due to climate change , and thus, the potential balance between enhanced mangrove forest inundation and predictions based on long-term DOC datasets remains to be determined.…”

Section: Tidal-scale Fdom Dynamicsmentioning

confidence: 99%

Linking Organic Matter Dynamics to Management, Restoration, and Climate in the Florida Everglades

Regier¹

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Production of chromophoric dissolved organic matter from mangrove leaf litter and floating Sargassum colonies

Cited by 52 publications

References 55 publications

Short-Term Dissolved Organic Carbon Dynamics Reflect Tidal, Water Management, and Precipitation Patterns in a Subtropical Estuary

Short-Term Dissolved Organic Carbon Dynamics Reflect Tidal, Water Management, and Precipitation Patterns in a Subtropical Estuary

Photobleaching as a factor controlling spectral characteristics of chromophoric dissolved organic matter in open ocean

Linking Organic Matter Dynamics to Management, Restoration, and Climate in the Florida Everglades

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