Estuarine Dissolved Organic Carbon Flux From Space: With Application to Chesapeake and Delaware Bays

Signorini, Sérgio R.; Mannino, Antonio; Friedrichs, Marjorie A. M.; St‐Laurent, Pierre; Wilkin, John; Tabatabai, A.; Najjar, Raymond G.; Hofmann, Eileen E.; Da, Fei; Tian, Hanqin; Yao, Yuanzhi

doi:10.1029/2018jc014646

Cited by 21 publications

(14 citation statements)

References 96 publications

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“…Our estimated retrieval uncertainty for DOC is within the range of remote sensing uncertainties reported from matchups for coastal waters off northeast America (±11 to 36 μmol liter −1 ) ( 82 ), while the uncertainties for our high-concentration stations (±100 to 240 μmol liter −1 ; fig. S14) are similar to the uncertainties reported from matchups for a DOC-rich marsh estuary in the Gulf of Mexico (±150 to 190 μmol liter −1 ) ( 83 ).…”

Section: Methodssupporting

confidence: 81%

Rising dissolved organic carbon concentrations in coastal waters of northwestern Borneo related to tropical peatland conversion

et al. 2022

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Southeast Asia’s peatlands are considered a globally important source of terrigenous dissolved organic carbon (DOC) to the ocean. Human disturbance has probably increased peatland DOC fluxes, but the lack of monitoring has precluded a robust demonstration of such a regional-scale impact. Here, we use a time series of satellite ocean color data from northwestern Borneo to show that DOC concentrations in coastal waters have increased between 2002 and 2021 by 0.31 μmol liter −1 year −1 (95% confidence interval, 0.18 to 0.44 μmol liter −1 year −1 ). We show that this was caused by a ≥30% increase in the concentration of terrigenous DOC and coincided with the conversion of 69% of regional peatland area to nonforest land cover, suggesting that peatland conversion has substantially increased DOC fluxes to the sea. This rise in DOC concentration has also increased the underwater light absorption by dissolved organic matter, which may affect marine productivity by altering underwater light availability.

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Section: Methodssupporting

confidence: 81%

Rising dissolved organic carbon concentrations in coastal waters of northwestern Borneo related to tropical peatland conversion

et al. 2022

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“…The most common way to distinguish marine from terrigenous CDOM is by measuring the slope of the CDOM absorption spectrum, originally over large wavelength ranges from UV to visible bands (Stedmon & Markager 2001, Kowalczuk et al 2006, Astoreca et al 2009). More recently, spectral slopes over narrow ranges of shorter wavelengths have become increasingly established for identifying terrigenous CDOM in terrestrially influenced waters, especially the spectral slope (S) between 275 and 295 nm, S 275−295 (Helms et al 2008, Vantrepotte et al 2015, Lu et al 2016, Medeiros et al 2017, Carr et al 2019, Signorini et al 2019. S 275−295 has also been used successfully to quantify tDOC concentrations in shelf seas (Fichot & Benner 2012, Fichot et al 2013.…”

mentioning

confidence: 99%

Dissolved organic matter from tropical peatlands reduces shelf sea light availability in the Singapore Strait, Southeast Asia

Martin

Sanwlani

Lee

et al. 2021

Mar. Ecol. Prog. Ser.

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Shelf seas provide valuable ecosystem services, but their productivity and ecological functioning depend critically on sunlight transmitted through the water column. Anthropogenic reductions in underwater light availability are thus a serious threat to coastal habitats. The flux of light-absorbing coloured dissolved organic matter (CDOM) from land to sea may have increased world-wide, but how this has altered the availability and spectral quality of light in shelf seas remains poorly known. We present time-series data from the Sunda Shelf in Southeast Asia, where the monsoon-driven reversal in ocean currents supplies water enriched in CDOM from tropical peatlands for part of the year, resulting in 5- to 10-fold seasonal variation in light absorption by CDOM. We show that this terrigenous CDOM can dominate underwater light absorption at wavelengths up to 500 nm, and shift the underwater irradiance spectrum towards longer wavelengths. The seasonal presence of terrigenous CDOM also reduces the 10% light penetration depth by 1-5 m, or 10-45%. We estimate that on average 0.6 m, or 25%, of this terrigenous CDOM-mediated shoaling might be attributable to the enhanced input of dissolved organic matter following peatland disturbance. The seasonal change in the light environment is correlated with changes in phytoplankton absorption spectra that suggest a photo-acclimation response, and we infer that terrigenous CDOM likely contributes to limiting the depth distribution of photosynthetic corals. The results reveal an ecologically important but largely overlooked impact of human modifications to carbon fluxes that is likely increasingly important in coastal seas.

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“…The most common way to distinguish marine from terrigenous CDOM is by measuring the slope of the CDOM absorption spectrum, originally over large wavelength ranges from UV to visible (Stedmon & Markager 2001, Kowalczuk et al 2006, Astoreca et al 2009). More recently, spectral slopes over narrow ranges of shorter wavelengths have become increasingly established for identifying terrigenous CDOM in terrestrially influenced marine waters, especially the spectral slope between 275-295 nm, S275-295 (Helms et al 2008, Vantrepotte et al 2015, Lu et al 2016, Medeiros et al 2017, Carr et al 2019, Signorini et al 2019. S275-295 has also been used successfully to quantify tDOC concentrations in shelf seas (Fichot & Benner 2012, Fichot et al 2013, Fichot et al 2014.…”

Section: Introductionmentioning

confidence: 99%

Dissolved organic matter from tropical peatlands impacts shelf sea light availability on coral reefs in the Singapore Strait, Southeast Asia

Martin

Sanwlani

Lee

et al. 2021

Preprint

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Shelf seas provide valuable ecosystem services, but their productivity and ecological functioning depend critically on sunlight transmitted through the water column. Anthropogenic reductions in underwater light availability are thus recognized as a serious threat to coastal habitats. The flux of strongly light-absorbing coloured dissolved organic matter (CDOM) from land to sea may have increased world-wide, but how this has altered the availability and spectral quality of light in shelf seas remains poorly known. Here, we present time-series data from the Sunda Shelf in Southeast Asia, where the monsoon-driven reversal in ocean currents supplies water enriched in CDOM from tropical peatlands for part of the year, resulting in 5–10-fold seasonal variation in light absorption by CDOM. We show that this terrigenous CDOM can dominate underwater light absorption at wavelengths up to 500 nm, and shift in the underwater irradiance spectrum towards longer wavelengths. The seasonal presence of terrigenous CDOM also causes the depth of 10% light penetration to shoal by 1–5 m, or 10–45%. We further estimate that on average 0.6 m, or 25%, of this terrigenous CDOM-mediated shoaling might be attributable to the enhanced loss of dissolved organic matter caused by peatland disturbance. We show that the seasonal change in the light environment is correlated with photo-acclimation by phytoplankton, and infer that terrigenous CDOM likely contributes to limiting the depth distribution of photosynthetic corals. Our results thus reveal an ecologically important but largely overlooked impact of human modifications to carbon fluxes that is likely becoming increasingly important in coastal seas.

show abstract

Estuarine Dissolved Organic Carbon Flux From Space: With Application to Chesapeake and Delaware Bays

Cited by 21 publications

References 96 publications

Rising dissolved organic carbon concentrations in coastal waters of northwestern Borneo related to tropical peatland conversion

Rising dissolved organic carbon concentrations in coastal waters of northwestern Borneo related to tropical peatland conversion

Dissolved organic matter from tropical peatlands reduces shelf sea light availability in the Singapore Strait, Southeast Asia

Dissolved organic matter from tropical peatlands impacts shelf sea light availability on coral reefs in the Singapore Strait, Southeast Asia

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