Dissolved carbon biogeochemistry and export in mangrove-dominated rivers of the Florida Everglades

Ho, David T.; Ferrón, Sara; Engel, V.; Anderson, William T.; Swart, Peter K.; Price, René M.; Barbero, Leticia

doi:10.5194/bg-14-2543-2017

Cited by 45 publications

(90 citation statements)

References 53 publications

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“…Biogeochemical cycling and property distributions in aquatic systems, including in lakes, estuaries, and ocean basins, depend on water transport paths and timescales. Analysis of transport paths and timescales has been used to estimate ventilation rates (Jenkins, 1987;England, 1995;Hohmann et al, 1998;Cao et al, 2009), to describe circulation and mixing (Fine, 1995;Haine et al, 1998;Schlosser et al, 2001;Wunsch, 2002), and to investigate river plume dynamics (Zhang et al, 2010(Zhang et al, , 2012. These analyses can either be the focus of or complement investigations into biogeochemical processes.…”

Section: Introductionmentioning

confidence: 99%

Diagnosing transit times on the northwestern North Atlantic continental shelf

Rutherford

Fennel

2018

Ocean Sci.

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Abstract. The circulation in the northwestern North Atlantic Ocean is highly complex, characterized by the confluence of two major western boundary current systems and several shelf currents. Here we present the first comprehensive analysis of transport paths and timescales for the northwestern North Atlantic shelf, which is useful for estimating ventilation rates, describing circulation and mixing, characterizing the composition of water masses with respect to different source regions, and elucidating rates and patterns of biogeochemical processing, species dispersal, and genetic connectivity. Our analysis uses dye and age tracers within a high-resolution circulation model of the region, divided into nine subregions, to diagnose retention times, transport pathways, and transit times. Retention times are shortest on the Scotian Shelf (∼ 3 months), where the inshore and shelf-break branches of the coastal current system result in high along-shelf transport to the southwest, and on the Grand Banks (∼ 3 months). Larger retention times are simulated in the Gulf of St. Lawrence (∼ 12 months) and the Gulf of Maine (∼ 6 months). Source water analysis shows that Scotian Shelf water is primarily comprised of waters from the Grand Banks and Gulf of St. Lawrence, with varying composition across the shelf. Contributions from the Gulf of St. Lawrence are larger at near-shore locations, whereas locations near the shelf break have larger contributions from the Grand Banks and slope waters. Waters from the deep slope have little connectivity with the shelf, because the shelf-break current inhibits transport across the shelf break. Grand Banks and Gulf of St. Lawrence waters are therefore dominant controls on biogeochemical properties, and on setting and sustaining planktonic communities on the Scotian Shelf.

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Section: Introductionmentioning

confidence: 99%

Diagnosing transit times on the northwestern North Atlantic continental shelf

Rutherford

Fennel

2018

Ocean Sci.

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show abstract

“…Biogeochemical cycling and property distributions in aquatic systems, including in lakes, estuaries, and ocean basins, depend on water transport paths and timescales. Analysis of transport paths and timescales has been used to estimate ventilation rates (Jenkins, 1987;England, 1995;Hohmann et al, 1998;Cao et al, 2009), to describe circulation and mixing (Fine, 1995;Haine et al, 1998;Schlosser et al, 2001;Wunsch, 2002), and to investigate river plume dynamics (Zhang et al, , 2012. These analyses can either be the focus of or complement investigations into biogeochemical processes.…”

Section: Introductionmentioning

confidence: 99%

Diagnosing transit times on the northwestern North Atlantic continental shelf

Rutherford¹,

Fennel²

2018

Preprint

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The circulation in the northwestern North Atlantic Ocean is highly complex, characterized by the confluence of two major western boundary current systems and several shelf currents. Here we present the first comprehensive analysis of transport paths and timescales for the northwestern North Atlantic shelf, which is useful for estimating ventilation rates, describing circulation and mixing, characterizing the composition of water masses with respect to different source regions, and elucidating rates and patterns of biogeochemical processing, species dispersal, and genetic connectivity. Our analysis uses dye and age tracers within a highresolution circulation model of the region, divided into nine subregions, to diagnose retention times, transport pathways, and transit times. Retention times are shortest on the Scotian Shelf (∼ 3 months), where the inshore and shelf-break branches of the coastal current system result in high alongshelf transport to the southwest, and on the Grand Banks (∼ 3 months). Larger retention times are simulated in the Gulf of St. Lawrence (∼ 12 months) and the Gulf of Maine (∼ 6 months). Source water analysis shows that Scotian Shelf water is primarily comprised of waters from the Grand Banks and Gulf of St. Lawrence, with varying composition across the shelf. Contributions from the Gulf of St. Lawrence are larger at near-shore locations, whereas locations near the shelf break have larger contributions from the Grand Banks and slope waters. Waters from the deep slope have little connectivity with the shelf, because the shelf-break current inhibits transport across the shelf break. Grand Banks and Gulf of St. Lawrence waters are therefore dominant controls on biogeochemical properties, and on setting and sustaining planktonic communities on the Scotian Shelf.Published by Copernicus Publications on behalf of the European Geosciences Union.

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“…In the Hooghly-Sundarbans system, [DIC] -[DOC] correlation was not significant (Sundarbans: p = 0.29, Hooghly: p = 0.16) suggesting limited role of phytoplankton production on the estuarine DOC level. In contrast to the Hooghly (p = 0.56), significant positive correlation between pCO2 and [DOC] was observed in the Sundarbans (p = 0.02, n = 11) suggesting analogous sources of pCO2 and DOC within the system, possibly through pore-water exchange from adjacent mangroves to the estuary as reported from other mangrove systems worldwide (Cai et al, 1999, Ho et al, 2017. (Sundarbans: p = 0.85, Hooghly: p = 0.40) as well as pCO2- [DOC] relationships (described earlier).…”

Section: Dissolved Organic Carbon Dynamicsmentioning

confidence: 67%

The postmonsoon carbon biogeochemistry of estuaries under different levels of anthropogenic impacts

Dutta

Kumar

Mukherjee

et al. 2018

Preprint

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Abstract. The different aspects of carbon biogeochemistry were studied during the postmonsoon at the Hooghly-Sundarbans estuarine system, a part of the Ganga-Brahmaputra river system located in the northeastern India. The study focused on understanding the differences in carbon biogeochemistry of estuaries undergoing different levels of anthropogenic stress by investigating anthropogenically influenced Hooghly estuary and mangrove-dominated estuaries of the Sundarbans. The salinity of well oxygenated (%DO: 91&#8211;104&#8201;%) estuaries of the Sundarbans varied over a narrow range (12.74&#8211;16.69) during postmonsoon relative to the Hooghly (0.04&#8211;10.37). Phytoplankton productivity and carbonate precipitation and/or dissolution were dominant processes controlling DIC dynamics in different parts of the Hooghly, whereas signal for mangrove derived DIC removal was observed in the Sundarbans. Influence of groundwater on estuarine DIC biogeochemistry was also observed in both the estuaries with relatively higher influence at the Hooghly than Sundarbans. In both estuarine systems, DOC behaved non-conservatively with ~&#8201;40&#8201;% higher DOC level in the Hooghly compared to the Sundarbans. No significant evidence of phytoplankton production on DOC level was found in these estuaries, however signal of DOC input through pore-water exchange at the Sundarbans was observed. Relatively lower &#948;13CPOC at the Hooghly compared to the Sundarbans suggest relatively higher terrestrial influence at the Hooghly with a possibility of in situ biogeochemical modifications of POC at the Sundarbans. The freshwater run-off coupled with in situ aerobic OC mineralization controlled estuarine pCO2 level at the Hooghly, whereas the same was principally exogenous for the Sundarbans. The entire Hooghly-Sundarbans system acted as source of CO2 to the regional atmosphere with ~&#8201;17 times higher emission from the Hooghly compared to Sundarbans. The present study clearly establishes the dominance of anthropogenically influenced estuary over relatively pristine mangrove dominated one in the regional greenhouse gas budget and climate change perspective.

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Dissolved carbon biogeochemistry and export in mangrove-dominated rivers of the Florida Everglades

Cited by 45 publications

References 53 publications

Diagnosing transit times on the northwestern North Atlantic continental shelf

Diagnosing transit times on the northwestern North Atlantic continental shelf

Diagnosing transit times on the northwestern North Atlantic continental shelf

The postmonsoon carbon biogeochemistry of estuaries under different levels of anthropogenic impacts

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