Methane emission from aquatic ecosystems of Mexico City

Martinez‐Cruz, Karla; Gonzalez-Valencia, Rodrigo; Sepulveda‐Jauregui, Armando; Plascencia-Hernandez, Fernando; Belmonte-Izquierdo, Yadira; Thalasso, F.

doi:10.1007/s00027-016-0487-y

Cited by 33 publications

(31 citation statements)

References 47 publications

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“…When expressed as annual fluxes, we find that urban ponds are important sources of CH 4 , with annual emissions of 8.3 g CH 4 ·m −2 ·yr −1 , similar to that reported from a eutrophic stormwater pond (7.3 g CH 4 ·m −2 ·yr −1 ; Martinez‐Cruz et al. ). This equates to approximately half the mean emissions from northern peatlands (95% confidence level: 10–21 g CH 4 ·m −2 ·yr −1 , Abdalla et al.…”

Section: Discussionsupporting

confidence: 87%

Greenhouse gas emissions from urban ponds are driven by nutrient status and hydrology

et al. 2019

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Inland waters emit significant quantities of greenhouse gases (GHGs) such as methane (CH4) and carbon dioxide (CO2) to the atmosphere. On a global scale, these emissions are large enough that their contribution to climate change is now recognized by the Intergovernmental Panel on Climate Change. Much of the past focus on GHG emissions from inland waters has focused on lakes, reservoirs, and rivers, and the role of small, artificial waterbodies such as ponds has been overlooked. To investigate the spatial variation in GHG fluxes from artificial ponds, we conducted a synoptic survey of forty urban ponds in a Swedish city. We measured dissolved concentrations of CH4 and CO2, and made complementary measurements of water chemistry. We found that CH4 concentrations were greatest in high‐nutrient ponds (measured as total phosphorus and total organic carbon). For CO2, higher concentrations were associated with silicon and calcium, suggesting that groundwater inputs lead to elevated CO2. When converted to diffusive GHG fluxes, mean emissions were 30.3 mg CH4·m−2·d−1 and 752 mg CO2·m−2·d−1. Although these fluxes are moderately high on an areal basis, upscaling them to all Swedish urban ponds gives an emission of 8336 t CO2eq/yr (±1689) equivalent to 0.1% of Swedish agricultural GHG emissions. Artificial ponds could be important GHG sources in countries with larger proportions of urban land.

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Section: Discussionsupporting

confidence: 87%

Greenhouse gas emissions from urban ponds are driven by nutrient status and hydrology

et al. 2019

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“…This is, however, unlikely to occur in hypereutrophic urban ponds, where labile OM availability tends to be high throughout the year both due to internal production and external inflow. The high OM availability and anoxic conditions in pond sediments, combined with the shallow water layer, readily explain the high rates of CH 4 ebullition in our pond (Sobek et al ; Martinez‐Cruz et al ). As these conditions are common in urban ponds (Waajen et al ), our results imply that CH 4 emission from these systems is high and strongly temperature dependent.…”

Section: Discussionmentioning

confidence: 65%

Seasonal and diel variation in greenhouse gas emissions from an urban pond and its major drivers

Bergen

Barros

Mendonça

et al. 2019

Limnology & Oceanography

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Small water systems are important hotspots of greenhouse gas (GHG) emission, but estimates are poorly constrained as data are scarce. Small ponds are often constructed in urban areas, where they receive large amounts of nutrients and therefore tend to be highly productive. Here, we investigated GHG emissions, seasonal and diel variation, and net ecosystem production (NEP) from an urban pond. In monthly 24‐h field campaigns during 11 months, diffusive water–atmosphere methane (CH4) and carbon dioxide (CO2) fluxes and CH4 ebullition and oxidation were quantified. With oxygen (O2) measurements, NEP was assessed. The pond was a net GHG source the entire year, with an emission of 3.4 kg CO2 eq m−2 yr−1. The dominant GHG emission pathway was CH4 ebullition (bubble flux, 50%), followed by diffusive emissions of CO2 (38%) and CH4 (12%). Sediment CH4 release was primarily driven by temperature and especially ebullition increased exponentially above a temperature threshold of 15°C. The pond's atmospheric CO2 exchange was not related to NEP or temperature but likely to a high allochthonous carbon (C) input via runoff and anaerobic mineralization of C. We expect urban ponds to show a large increase in GHG emission with increasing temperature, which should be considered carefully when constructing ponds in urban areas. Emissions may partly be counteracted by pond management focusing on a reduction of nutrient and organic matter input.

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“…Elevated surface concentrations of CH 4 (3.1×) and CO 2 (1.6×) in urban tributaries, compared with adjacent midchannel sites, supported H2. The higher surface values of CH 4 and CO 2 quantified in urban tributaries and tidal straits, each containing up to 50 sewage delivery sites (NYCDEP ), are likely the result of direct inputs of GHGs transported along with sewage discharges, which have been quantified directly in streams and inland waters (Alshboul et al ; Martinez‐Cruz et al ; Smith et al ), but not in estuaries until recently (Garnier et al ; Marescaux et al ).…”

Section: Discussionmentioning

confidence: 99%

Anthropogenic inputs from a coastal megacity are linked to greenhouse gas concentrations in the surrounding estuary

Brigham

Bird

Juhl

et al. 2019

Limnology & Oceanography

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Coastal megacities deposit significant amounts of carbon (C), nitrogen (N), and pollutants into surrounding waters. In urbanized estuaries, these inputs, including wastewater discharge and surface runoff, can affect biogeochemical cycles, microbial production, and greenhouse gas (GHG) efflux. To better understand estuarine GHG production and its connection to anthropogenic drivers, we quantified carbon dioxide (CO2) and methane (CH4) surface‐water concentrations and efflux in combination with a suite of biogeochemical parameters, including anthropogenic indicators, in the Hudson River Estuary (HRE) and adjacent waters surrounding New York, NY, over a 2‐yr period. The HRE was a source of both CO2 (33 ± 3 mmol CO2 m−2 d−1) and CH4 (177 ± 22 μmol CH4 m−2 d−1) under all measured conditions. Surface‐water salinity, oxygen saturation, fecal indicator bacteria, nitrate concentrations, and temperature best explained the variance in CO2 and CH4 concentrations in multiple regression analyses, producing robust predictive power for both GHGs. Our multifaceted data set demonstrated that CH4 and CO2 surface concentrations are explained in part by enterococci concentrations, a widely used wastewater biological indicator, explicitly linking wastewater inputs to GHG surface concentrations in the HRE. The greatest CO2 and CH4 surface‐water concentrations were found in urban tributaries and embayments, primary wastewater delivery areas throughout the HRE. Estuarine tributaries and embayments have historically received less research attention than midchannel sites, but since these shallow sites may contribute to increased GHG efflux in anthropogenically impacted estuaries, further study is warranted.

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Methane emission from aquatic ecosystems of Mexico City

Cited by 33 publications

References 47 publications

Greenhouse gas emissions from urban ponds are driven by nutrient status and hydrology

Greenhouse gas emissions from urban ponds are driven by nutrient status and hydrology

Seasonal and diel variation in greenhouse gas emissions from an urban pond and its major drivers

Anthropogenic inputs from a coastal megacity are linked to greenhouse gas concentrations in the surrounding estuary

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