Abundance, distribution, and fluxes of dissolved organic carbon (DOC) in four small sub-tropical rivers of the Tampa Bay Estuary (Florida, USA)

Moyer, Ryan P.; Powell, Christina E.; Gordon, David J.; Long, Jacqueline S.; Bliss, Chelsea M.

doi:10.1016/j.apgeochem.2015.05.004

Cited by 31 publications

(14 citation statements)

References 95 publications

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“…The correlation analysis results ( Fig. 2 ) demonstrate that the RD and the Rc have a substantial positive effect on the TOCL, which is consistent with the results of many studies 7 38 39 40 41 . This observation may have been related to the fluvial flow that occurs with water erosion, which transports topsoil and soil organic matter to the water channel, thereby increasing the organic carbon in river water 3 .…”

Section: Discussionsupporting

confidence: 90%

Control factors and scale analysis of annual river water, sediments and carbon transport in China

Song

Wang

Sun

et al. 2016

Sci Rep

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Under the context of dramatic human disturbances on river system, the processes that control the transport of water, sediment, and carbon from river basins to coastal seas are not completely understood. Here we performed a quantitative synthesis for 121 sites across China to find control factors of annual river exports (Rc: runoff coefficient; TSSC: total suspended sediment concentration; TSSL: total suspended sediment loads; TOCL: total organic carbon loads) at different spatial scales. The results indicated that human activities such as dam construction and vegetation restoration might have a greater influence than climate on the transport of river sediment and carbon, although climate was a major driver of Rc. Multiple spatial scale analyses indicated that Rc increased from the small to medium scale by 20% and then decreased at the sizable scale by 20%. TSSC decreased from the small to sizeable scale but increase from the sizeable to large scales; however, TSSL significantly decreased from small (768 g·m−2·a−1) to medium spatial scale basins (258 g·m−2·a−1), and TOCL decreased from the medium to large scale. Our results will improve the understanding of water, sediment and carbon transport processes and contribute better water and land resources management strategies from different spatial scales.

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Section: Discussionsupporting

confidence: 90%

Control factors and scale analysis of annual river water, sediments and carbon transport in China

Song

Wang

Sun

et al. 2016

Sci Rep

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“…Esse comportamento de relativa diminuição das concentrações de carbono na interface continente-oceano é esperado, já que os valores no oceano são inferiores aos encontrados na zona costeira, e estes, menores que os encontrados nas fontes terrestres, evidenciando o avanço e permanência da massa de água costeira no CESM durante a estação seca. Moyer et al, (2015) observaram diferenças significativas espaciais e temporais na abundância e fluxo de COD, em cinco pequenos rios subtropicais e riachos de maré em Tampa Bay Estuary, na região costeira e dentro das suas zonas de mistura devido à dinâmica estuarina local. Suzuki et al (2015) mostraram uma ampla variação do COP e COD na região entre a Plataforma Continental (PC) e Margem Continental (MC) entre as isóbatas de 25 a 3000m.…”

Section: Carbono Orgânico Dissolvido E Nitrogênio Total Dissolvidounclassified

Caracterização biogeoquímica da matéria orgânica em um estuário de macromaré localizado na interface Amazônia-semiárido no nordeste do Brasil

Corrêa¹,

Serejo²,

Rangel³

et al. 2019

Geochim. Bras.

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RESUMOOs estuários são ambientes costeiros de transição, que atuam como um filtro natural e sítio de troca de água e matéria, principalmente matéria orgânica, onde grande parte do carbono pode ser importado e/ou exportado. O objetivo deste estudo é compreender a composição da matéria orgânica na coluna de água do Complexo Estuarino da Baía de São Marcos, um ambiente sob a influência de macromaré semi-diurna. Para traçar a distribuição da matéria orgânica com mais precisão, a composição elementar é usada juntamente com a composição isotópica do carbono e do nitrogênio. A amostragem foi realizada em agosto de 2016, em três transectos, totalizando 14 estações. A água foi amostrada em duas profundidades diferentes, subsuperficie e fundo. Os seguintes parâmetros foram medidos: material particulado em suspensão, carbono orgânico dissolvido, carbono orgânico particulado, isótopos estáveis de carbono e nitrogênio, razão atômica (C/N)a. Os parâmetros condutividade elétrica, oxigênio dissolvido e temperatura foram medidos in situ. O material particulado em suspensão teve média de 360,6 mg L -1 ) no meio com uma pequena diminuição (média de 344,6 mg L -1 ) para a parte mais interna da baía. O carbono orgânico apresentou maiores concentrações sob a forma dissolvida (média 10,97 mg L -1 ), variando entre as profundidades e os pontos amostrais. As concentrações de nitrogênio total foram baixas (média 0,38 mg L -1 ), estando relacionadas à pouca influência de compostos nitrogenados. A razão isotópica e C/N indicam que o manguezal representa uma importante fonte de carbono orgânico particulado e dissolvido nesse estuário. Palavras-chave: Complexo estuarino, marcadores geoquímicos, carbono orgânico, isótopos estáveis, Complexo Estuarino da Baía de São Marcos ABSTRACTEstuaries are transitional, coastal environments that act as natural filters and areas for the exchange of water and materials, mainly organic matter, which is composed of a significant portion of the transported carbon. Estuaries may import, export or retain dissolved and particulate organic matter. The aim of this study is to understand the composition of the organic matter in the water column of São Marcos Bay Estuarine Complex, a macrotidal environment under influence of semidiurnal tides. To investigate the distribution of organic matter more precisely, the elemental composition was used along with the carbon and nitrogen isotopic composition. The sampling was carried out in August 2016, in 3 transects, with a total of 14 stations. The water was sampled in two different depths, subsurface and bottom. The following parameters were measured: suspended particulate matter, dissolved organic carbon, particulate organic carbon, carbon and nitrogen stable isotopes andthe atomic ratio (C/N)a. The parameters electrical conductivity, dissolved oxygen, and temperature were measured in situ. SPM had a mean of 360.6 (mg L -1 ) in the medium with a small decrease (mean of 344.6 mg L -1 ) for the innermost part of the bay. The organic carbon presented higher concentrations in t...

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“…A portion (~0.6 Pg C/year) is stored as sediments in inland waters, and finally~0.9 Pg C/year is released to the oceans (Aufdenkampe et al, 2011). Hereby, wetlands play a remarkable role in controlling carbon sequestration (Aiken & Cotsaris, 1995;Cook et al, 2017;Dittmar et al, 2006;Moyer et al, 2015) from inland sources. Overall, half of the carbon exported from inland waters reaches the oceans as organic molecules (Aarnos et al, 2018;Battin et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

DOC Transport and Export in a Dynamic Tropical Catchment

et al. 2019

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Dissolved organic carbon (DOC) transport and export from headwater forests into freshwaters in highly dynamic tropical catchments are still understudied. Here we present a DOC analysis (2017) in a pristine and small (~2.6 km2) tropical catchment of Costa Rica. Storm flows governed a rapid surface and lateral allochthonous DOC transport (62.2% of the annual DOC export). Cross‐correlation analysis of rainfall and stream discharge indicated that DOC transport occurred on average ~1.25 hr after the rainfall maxima, with large contributions of event water, ranging from 42.4±0.3% up to 98.2±0.3% of the total discharge. Carbon export flux (annual mean=6.7±0.1 g C · m‐2 · year‐1) was greater than values reported in subtropical and temperate catchments. Specific ultraviolet absorbance indicated a mixture of hydrophobic humic and hydrophilic nonhumic matter during both baseflow and storm events. Our results highlight the rapid storm‐driven DOC transport and export as well as low biogeochemical attenuation during baseflow episodes in a climate sensitive hot spot. By understanding the key factors controlling the amount of organic carbon transported to streams in dynamic tropical landscapes, better global‐ and catchment‐scale model assessments, conservation practices, and water treatment innovations can be identified.

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Abundance, distribution, and fluxes of dissolved organic carbon (DOC) in four small sub-tropical rivers of the Tampa Bay Estuary (Florida, USA)

Cited by 31 publications

References 95 publications

Control factors and scale analysis of annual river water, sediments and carbon transport in China

Control factors and scale analysis of annual river water, sediments and carbon transport in China

Caracterização biogeoquímica da matéria orgânica em um estuário de macromaré localizado na interface Amazônia-semiárido no nordeste do Brasil

DOC Transport and Export in a Dynamic Tropical Catchment

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