Diurnal Variations of Carbon Dioxide, Methane, and Nitrous Oxide Vertical Fluxes in a Subtropical Estuarine Marsh on Neap and Spring Tide Days

Tong, Chuan; Jing, Huang; Hu, Zhi; Jin, Yu

doi:10.1007/s12237-013-9596-1

Cited by 68 publications

(46 citation statements)

References 29 publications

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“…As the gas sampling chambers were darkened, CO 2 emissions were assumed to be constant on a daily and nightly basis. And although some studies have found diurnal variations in CH 4 emissions (Käki et al, 2001;Neubauer et al, 2000;Tong et al, 2013), no consistent pattern has been found. Hence, we assumed that the CH 4 emissions were also constant on a daily basis.…”

Section: Gas Sampling and Analysismentioning

confidence: 91%

Factors influencing CO2 and CH4 emissions from coastal wetlands in the Liaohe Delta, Northeast China

Olsson

et al. 2015

Biogeosciences

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Abstract. Many factors are known to influence greenhouse gas emissions from coastal wetlands, but it is still unclear which factors are most important under field conditions when they are all acting simultaneously. The objective of this study was to assess the effects of water table, salinity, soil temperature and vegetation on CH 4 emissions and ecosystem respiration (R eco ) from five coastal wetlands in the Liaohe Delta, Northeast China: two Phragmites australis (common reed) wetlands, two Suaeda salsa (sea blite) marshes and a rice (Oryza sativa) paddy. Throughout the growing season, the Suaeda wetlands were net CH 4 sinks whereas the Phragmites wetlands and the rice paddy were net CH 4 sources emitting 1.2-6.1 g CH 4 m −2 yr −1 . The Phragmites wetlands emitted the most CH 4 per unit area and the most CH 4 relative to CO 2 . The main controlling factors for the CH 4 emissions were water table, temperature, soil organic carbon and salinity. The CH 4 emission was accelerated at high and constant (or managed) water tables and decreased at water tables below the soil surface. High temperatures enhanced CH 4 emissions, and emission rates were consistently low (< 1 mg CH 4 m −2 h −1 ) at soil temperatures < 18 • C. At salinity levels > 18 ppt, the CH 4 emission rates were always low (< 1 mg CH 4 m −2 h −1 ) probably because methanogens were out-competed by sulphate-reducing bacteria. Saline Phragmites wetlands can, however, emit significant amounts of CH 4 as CH 4 produced in deep soil layers are transported through the air-space tissue of the plants to the atmosphere. The CH 4 emission from coastal wetlands can be reduced by creating fluctuating water tables, including water tables below the soil surface, as well as by occasional flooding by high-salinity water. The effects of water management schemes on the biological communities in the wetlands must, however, be carefully studied prior to the management in order to avoid undesirable effects on the wetland communities.

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Section: Gas Sampling and Analysismentioning

confidence: 91%

Factors influencing CO2 and CH4 emissions from coastal wetlands in the Liaohe Delta, Northeast China

Olsson

et al. 2015

Biogeosciences

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“…The gases CO 2 , CH 4 and N 2 O across the atmosphereewater interface during the culture period and the sedimenteatmosphere interface during the drained period were collected with floating static chambers (Diem et al, 2012;Zhao et al, 2013) and enclosed static chambers (Tong et al, 2013), respectively. Gas fluxes were measured two or three times every month from the mixed culture pond (water-atmosphere interface: from September to November in 2011; sedimenteatmosphere interface: from December 2011 to January 2012) and the shrimp pond (water-atmosphere interface: from June to November in 2012).…”

Section: Gas Sampling and Flux Estimationmentioning

confidence: 99%

Fluxes of greenhouse gases at two different aquaculture ponds in the coastal zone of southeastern China

Yang

Huang

et al. 2015

Atmospheric Environment

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“…Estuarine CH 4 and N 2 O emissions and surface water concentrations are typically measured at a fixed time, often in combination with spatial surveys along the estuary and possibly repeated over seasons. While this sampling may be adequate to capture spatial variations along estuaries at a fixed point in time and general seasonal patterns, it cannot measure tidal and diurnal cycle variability of CH 4 and N 2 O emissions or concentrations although changes can be significant Tong et al 2013;. These significant changes are important to be captured especially when the results are used to estimate estuarine GHG budgets of CH 4 and N 2 O.…”

Section: Declaration By Authormentioning

confidence: 99%

“…Large uncertainties and variations of the gas transfer coefficient in estuaries and rivers highlight that the controlling factors for turbulences are site specific and not only limited to wind and N 2 O emissions or concentrations. Measurements considering diurnal and tidal dynamics are rare although changes can be significant Tong et al 2013;. These significant changes are important to be captured, especially when the results are used to estimate estuarine GHG budgets of CH 4 and N 2 O.…”

Section: Investigation Of the Drivers Affecting Ch 4 And N 2 O Emissimentioning

confidence: 99%

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Methane and nitrous oxide emissions from South East Queensland waterways

Sturm¹

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Methane (CH 4 ) and nitrous oxide (N 2 O) are highly potent greenhouse gases (GHGs) with long-term influences on the climate and global warming potentials of 34 and 298 times that of carbon dioxide, respectively. Man-made reservoirs and modified estuaries have been identified as significant aquatic sources of these GHGs. However, there are limited data of the spatial and temporal patterns of CH 4 and N 2 O emissions from these aquatic systems and research on the sources and sinks of these gases are scarce. The lack of data is particularly pronounced for subtropical regions in the Southern Hemisphere. The main aims of this thesis are to investigate CH 4 and N 2 O emissions from a selected subtropical estuary (Brisbane River estuary) and a reservoir (Gold Creek Reservoir) and to identify sources and sinks of these gases in the selected waterways. Methods which facilitate the accurate determination of CH 4 and N 2 O emissions were examined and improved. emissions. Furthermore, results from thin boundary layer models, where wind and current speed models are used to determine the gas transfer coefficient (k) were compared to k derived from floating chamber flux measurements. However, k could not be successfully calculated based on six wind and five current speed models alone or in combination at any of the three estuarine sampling sites in comparison to k calculated from the measured emissions. These results stress the importance for direct emission measurements obtained by floating chambers in highly variable systems like the Brisbane River estuary. Sediments were shown to be estuarine sources for CH 4 and N 2 O, whereas the water column was identified as a sink for CH 4 and neither a sink nor a source for N 2 O.III

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Diurnal Variations of Carbon Dioxide, Methane, and Nitrous Oxide Vertical Fluxes in a Subtropical Estuarine Marsh on Neap and Spring Tide Days

Cited by 68 publications

References 29 publications

Factors influencing CO<sub>2</sub> and CH<sub>4</sub> emissions from coastal wetlands in the Liaohe Delta, Northeast China

Factors influencing CO<sub>2</sub> and CH<sub>4</sub> emissions from coastal wetlands in the Liaohe Delta, Northeast China

Fluxes of greenhouse gases at two different aquaculture ponds in the coastal zone of southeastern China

Methane and nitrous oxide emissions from South East Queensland waterways

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Diurnal Variations of Carbon Dioxide, Methane, and Nitrous Oxide Vertical Fluxes in a Subtropical Estuarine Marsh on Neap and Spring Tide Days

Cited by 68 publications

References 29 publications

Factors influencing CO&lt;sub&gt;2&lt;/sub&gt; and CH&lt;sub&gt;4&lt;/sub&gt; emissions from coastal wetlands in the Liaohe Delta, Northeast China

Factors influencing CO&lt;sub&gt;2&lt;/sub&gt; and CH&lt;sub&gt;4&lt;/sub&gt; emissions from coastal wetlands in the Liaohe Delta, Northeast China

Fluxes of greenhouse gases at two different aquaculture ponds in the coastal zone of southeastern China

Methane and nitrous oxide emissions from South East Queensland waterways

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Factors influencing CO<sub>2</sub> and CH<sub>4</sub> emissions from coastal wetlands in the Liaohe Delta, Northeast China

Factors influencing CO<sub>2</sub> and CH<sub>4</sub> emissions from coastal wetlands in the Liaohe Delta, Northeast China