Greenhouse gas emissions from Mexican inland waters: first estimation and uncertainty using an upscaling approach

Sánchez-Carrillo, Salvador; Alcocer, Javier; Vargas-Sánchez, Mariana; Soria-Reinoso, Ismael; Rivera-Herrera, Erika M.; Cortés‐Guzmán, Daniela; Cuevas-Lara, Daniel; Guzmán-Arias, Andrea P.; Merino–Ibarra, Martín; Oseguera, Luis A.

doi:10.1080/20442041.2021.2009310

Cited by 5 publications

(2 citation statements)

References 57 publications

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“…Although DelSontro et al [8] estimated that GHG emissions from lakes and impoundments are equivalent to ~20% of global fossil fuel CO 2 emissions, Pollard [11] recently quantified that current emissions from freshwaters occur at an annual rate six times that of fossil fuel burning. Moreover, GHG emission data from tropical and subtropical freshwaters remain very sparse, and global assessments also experience this geographic bias [12]. Nonetheless, there is quite a lot of unanimity that GHG emissions will intensify even further with the continued eutrophication of lentic ecosystems [8,9,13], but its magnitude is not yet clear.…”

Section: Introductionmentioning

confidence: 99%

Carbon Dioxide Concentration and Emissions along a Trophic Gradient in Tropical Karst Lakes

Vargas-Sánchez

Alcocer

Sánchez-Carrillo

et al. 2022

Water

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Inland aquatic ecosystems are valuable sentinels of anthropic-associated changes (e.g., agriculture and tourism). Eutrophication has become of primary importance in altering aquatic ecosystem functioning. Quantifying the CO2 emissions by inland aquatic ecosystems of different trophic statuses may provide helpful information about the role of eutrophication on greenhouse gas emissions. This study investigated diel and seasonal carbon dioxide (CO2) concentrations and emissions in three tropical karst lakes with different trophic statuses. We measured CO2 emissions using static floating chambers twice daily during the rainy/warm and dry/cold seasons while the lakes were thermally stratified and mixed, respectively. The CO2 concentration was estimated by gas chromatography and photoacoustic spectroscopy. The results showed a significant seasonal variation in the dissolved CO2 concentration (CCO2) and the CO2 flux (FCO2), with the largest values in the rainy/warm season but not along the diel cycle. The CCO2 values ranged from 13.3 to 168.6 µmol L−1 averaging 41.9 ± 35.3 µmol L−1 over the rainy/warm season and from 12.9 to 38.0 µmol L−1 with an average of 21.0 ± 7.2 µmol L−1 over the dry/cold season. The FCO2 values ranged from 0.2 to 12.1 g CO2 m−2 d−1 averaging 4.9 ± 4.0 g CO2 m−2 d−1 over the rainy/warm season and from 0.1 to 1.7 g CO2 m−2 d−1 with an average of 0.8 ± 0.5 g CO2 m−2 d−1 over the dry/cold season. During the rainy/warm season the emission was higher in the eutrophic lake San Lorenzo (9.1 ± 1.2 g CO2 m−2 d−1), and during the dry/cold the highest emission was recorded in the mesotrophic lake San José (1.42 ± 0.2 g CO2 m−2 d−1). Our results indicated that eutrophication in tropical karst lakes increased CO2 evasion rates to the atmosphere mainly due to the persistence of anoxia in most of the lake’s water column, which maintained high rates of anaerobic respiration coupled with the anaerobic oxidation of methane. Contrarily, groundwater inflows that provide rich-dissolved inorganic carbon waters sustain emissions in meso and oligotrophic karstic tropical lakes.

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Section: Introductionmentioning

confidence: 99%

Carbon Dioxide Concentration and Emissions along a Trophic Gradient in Tropical Karst Lakes

Vargas-Sánchez

Alcocer

Sánchez-Carrillo

et al. 2022

Water

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“…In tropical America, a lack of knowledge about the role of river systems in the regional C cycle is evident [58][59][60]. Mexico has the largest rivers in Central America, but scientific knowledge of these rivers is still incipient.…”

Section: Introductionmentioning

confidence: 99%

The Seasonal Dynamics of Organic and Inorganic Carbon along the Tropical Usumacinta River Basin (Mexico)

Soria-Reinoso

Alcocer

Sánchez-Carrillo

et al. 2022

Water

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Rivers are important sites for carbon (C) transport and critical components of the global C cycle that is currently not well constrained. However, little is known about C species’ longitudinal and temporal changes in large tropical rivers. The Usumacinta River is Mexico’s main lotic system and the tenth largest in North America. Being a tropical river, it has a strong climatic seasonality. This study aims to evaluate how organic (DOC and POC) and inorganic (DIC and PIC) carbon change spatially and seasonally along the Usumacinta River (medium and lower basin) in rainy (RS-2017) and dry (DS-2018) seasons and to estimate C fluxes into the southern Gulf of Mexico. Concentrations of DOC, POC, DIC, and PIC ranged from 0.88 to 7.11 mg L−1, 0.21 to 3.78 mg L−1, 15.59 to 48.27 mg L−1, and 0.05 to 1.51 mg L−1, respectively. DOC was the dominant organic species (DOC/POC > 1). It was ~doubled in RS and showed a longitudinal increase, probably through exchange with wetlands and floodplains. Particulate carbon showed a positive relationship with the total suspended solids, suggesting that in RS, it derived from surface erosion and runoff in the watershed. DIC is reported for the first time as the highest concentration measured in tropical rivers in America. It was higher in the dry season without a longitudinal trend. The C mass inflow–outflow balance in the RS suggested net retention (DOC and POC sink) in floodplains. In contrast, in the DS, the balance suggested that floodplains supply (C source) autochthonous DOC and POC. The lower Usumacinta River basin is a sink for DIC in both seasons. Finally, the estimated annual C export for the Usumacinta-Grijalva River was 2.88 (2.65 to 3.14) Tg yr−1, of which DIC was the largest transported fraction (85%), followed by DOC (10%), POC (4%), and PIC (<1%). This investigation is the first to present the C loads in a Mexican river.

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Characteristics and influencing factors of CO2 emission from inland waters in China

Zhou,

Wang,

Xiao

et al. 2024

Sci. China Earth Sci.

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Greenhouse gas emissions from Mexican inland waters: first estimation and uncertainty using an upscaling approach

Cited by 5 publications

References 57 publications

Carbon Dioxide Concentration and Emissions along a Trophic Gradient in Tropical Karst Lakes

Carbon Dioxide Concentration and Emissions along a Trophic Gradient in Tropical Karst Lakes

The Seasonal Dynamics of Organic and Inorganic Carbon along the Tropical Usumacinta River Basin (Mexico)

Characteristics and influencing factors of CO2 emission from inland waters in China

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