Spatial and seasonal variability of CH 4  in the eastern Gulf of Cadiz (SW Iberian Peninsula)

Sierra, A.; Jiménez-López, D.; Ortega, T.; Ponce, R.; Bellanco, M.J.; Sánchez-Leal, R.F.; Gómez-Parra, Abelardo; Forja, Jesús M.

doi:10.1016/j.scitotenv.2017.03.030

Cited by 20 publications

(11 citation statements)

References 83 publications

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“…It is worth noting that the CH 4 emissions fluxes in subtropical estuarine aquaculture ponds were substantially higher than those from the freshwater aquaculture systems (e.g., Da Silva et al, 2018;Hu et al, 2014;Hu et al, 2016;Liu et al, 2015;Wu et al, 2018) and were 1 to 3 orders of magnitude larger than those observed in most reservoirs and lakes (e.g., Gerardo-Nieto et al, 2017;Huttunen et al, 2003;Musenze et al, 2014;Natchimuthu et al, 2016;Wen et al, 2016;Xiao et al, 2017;Zhao et al, 2013;Zhu et al, 2010). CH 4 diffusion fluxes in our ponds were also substantially higher than those in coastal aquatic ecosystems (Sierra et al, 2017) and was approximately 8 times higher than the average of 0.09 mmol·m −2 ·hr −1 found in Chinas natural wetlands (Wei & Wang, 2017). Moreover, the magnitude of CH 4 emissions observed in our ponds were much larger than those from the estuarine brackish Cyperus malaccensis marshs (ranged from 0.04 to 0.32 mmol·m −2 ·hr −1 ; Yang et al, 2019).…”

Section: Implications Of Large Ch 4 Emission Fluxcontrasting

confidence: 48%

“…Markedly temporal variations in CH 4 concentration/flux have been reported in lakes (Natchimuthu et al, 2016;Xiao et al, 2017), rivers (Borges et al, 2018;Zhao et al, 2013), shallow ponds (Holgerson, 2015;Yang et al, 2018), and coastal and continental shelf zones (e.g., Borges et al, 2018;Cunada et al, 2018;Gülzow et al, 2014;Jakobs et al, 2014;Sierra et al, 2017). Most of these studies have related the seasonal patterns of CH 4 with variation in temperature (e.g., Borges, et al, 2017;Natchimuthu et al, 2016;Sierra et al, 2017;Xiao et al, 2017;Yang et al, 2018;Zhao et al, 2013), particularly the increase in sediment CH 4 production rates in response to the increasing temperature ( In addition, some studies found that the seasonal variation of CH 4 could be governed by the changes in DO concentrations in aquatic systems (Holgerson, 2015;Hu et al, 2018;Zhao et al, 2013). Generally, when DO concentration is low in water, the methanogenic (anaerobic bacteria) activity increases and the CH 4 oxidation capacity declines, which leads to the increase in sediment CH 4 production and subsequent emission Ivanov et al, 2002).…”

Section: Factors Influencing the Temporal Variations Of Ch 4 Fluxmentioning

confidence: 99%

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Large Fine‐Scale Spatiotemporal Variations of CH₄ Diffusive Fluxes From Shrimp Aquaculture Ponds Affected by Organic Matter Supply and Aeration in Southeast China

et al. 2019

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Mariculture shrimp ponds are important CH4 sources to the atmosphere. However, the spatiotemporal variations of CH4 concentration and flux at fine spatial scales in mariculture ponds are poorly known, particularly in China, worlds largest aquaculture producer. In this study, the plot‐scale spatiotemporal variations of water CH4 concentration and flux, both within and among ponds, were researched in shrimp ponds in Shanyutan wetland, Min River Estuary, Southeast China. The average water CH4 concentration and diffusion flux across the water‐air interface in the shrimp ponds over the shrimp aquaculture period varied from 2.29 ± 0.29 to 50.48 ± 20.91 μM and from 0.09 ± 0.01 to 2.32 ± 0.95 mmol·m−2·hr−1, respectively. The CH4 emissions from the estuarine ponds varied greatly between seasons, with peaks in August and September, which was similar to the trend of water temperature and dissolved oxygen concentrations. There was no remarkable difference in CH4 concentration and flux between shrimp ponds but significantly spatiotemporal differences in CH4 concentration and flux within the ponds. Significantly higher emissions occurred in the feeding zone, accounting for approximately 60% of total CH4 emission flux, while much lower CH4 emissions appeared in aeration zone, contributing 14% to total flux. This study suggests the importance of considering spatiotemporal variation in the whole‐pond estimates of CH4 concentration and flux. In light of such high spatial variation within ponds, improving aeration and feed utilization efficiency would help to mitigate CH4 emissions from mariculture ponds.

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Section: Implications Of Large Ch 4 Emission Fluxcontrasting

confidence: 48%

Section: Factors Influencing the Temporal Variations Of Ch 4 Fluxmentioning

confidence: 99%

Large Fine‐Scale Spatiotemporal Variations of CH₄ Diffusive Fluxes From Shrimp Aquaculture Ponds Affected by Organic Matter Supply and Aeration in Southeast China

et al. 2019

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“…We acidified with phosphoric acid (final pH<2) the samples for DOC, total dissolved nitrogen (TDN), and total nitrogen (TN). We measured DOC, dissolved inorganic carbon (DIC), TN, and TDN by high-temperature catalytic oxidation using a Shimadzu total organic carbon (TOC) analyzer (Model TOC-V CSH) coupled to nitrogen analyzer (TNM-1) (Álvarez-Salgado and Miller 1998 We also measured dissolved CH 4 and N 2 O by headspace equilibration in a 50 ml air-tight glass syringe by duplicate in the water column (Sierra et al 2017a(Sierra et al , 2017b. We analyzed simultaneously the concentration of dissolved CH 4 and N 2 O using gas chromatography (more details in supplementary methods).…”

Section: C N and P Analysis In The Water Columnmentioning

confidence: 99%

Greenhouse gas fluxes from reservoirs determined by watershed lithology, morphometry, and anthropogenic pressure

León‐Palmero

Morales‐Baquero

Reche

2020

Environ. Res. Lett.

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Human population growth has increased the demand for water and clean energy, leading to the massive construction of reservoirs. Reservoirs can emit greenhouse gases (GHG) affecting the atmospheric radiative budget. The radiative forcing due to CO 2 , CH 4 , and N 2 O emissions and the relative contribution of each GHG in terms of CO 2 equivalents to the total forcing is practically unknown. We determined simultaneously the CO 2 , CH 4 , and N 2 O fluxes in reservoirs from diverse watersheds and under variable human pressure to cover the vast idiosyncrasy of temperate Mediterranean reservoirs. We obtained that GHG fluxes ranged more than three orders of magnitude. The reservoirs were sources of CO 2 and N 2 O when the watershed lithology was mostly calcareous, and the crops and the urban areas dominated the landscape. By contrast, reservoirs were sinks of CO 2 and N 2 O when the watershed lithology was predominantly siliceous, and the landscape had more than 40% of forestal coverage. All reservoirs were sources of CH 4 , and emissions were determined mostly by reservoir mean depth and water temperature. The radiative forcing was substantially higher during the stratification than during the mixing. During the stratification the radiative forcings ranged from 125 mg CO 2 equivalents m −2 d −1 to 31 884 mg CO 2 equivalents m −2 d −1 and were dominated by the CH 4 emissions; whereas during the mixing the radiative forcings ranged from 29 mg CO 2 equivalents m −2 d −1 to 722 mg CO 2 equivalents m −2 d −1 and were dominated by CO 2 emissions. The N 2 O contribution to the radiative forcing was minor except in one reservoir with a landscape dominated by crops and urban areas. Future construction of reservoirs should consider that siliceous bedrocks, forestal landscapes, and deep canyons could minimize their radiative forcings.

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“…where O 2 / t is the change in dissolved oxygen concentration through time, F is the exchange of O 2 with the atmosphere, and A is a term that combines all other processes that may cause changes in the dissolved oxygen concentration as horizontal or vertical advection, and it is often assumed to be negligible. The calculations were performed as in Staehr et al (2010). The physical gas flux was modeled as follows (Eq.…”

mentioning

confidence: 99%

Dissolved CH<sub>4</sub> coupled to photosynthetic picoeukaryotes in oxic waters and to cumulative chlorophyll <i>a</i> in anoxic waters of reservoirs

León‐Palmero

Contreras-Ruiz

Sierra³

et al. 2020

Biogeosciences

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Abstract. Methane (CH4) emissions from reservoirs are responsible for most of the atmospheric climatic forcing of these aquatic ecosystems, comparable to emissions from paddies or biomass burning. Primarily, CH4 is produced during the anaerobic mineralization of organic carbon in anoxic sediments by methanogenic archaea. However, the origin of the recurrent and ubiquitous CH4 supersaturation in oxic waters (i.e., the methane paradox) is still controversial. Here, we determined the dissolved CH4 concentration in the water column of 12 reservoirs during summer stratification and winter mixing to explore CH4 sources in oxic waters. Reservoir sizes ranged from 1.18 to 26.13 km2. We found that dissolved CH4 in the water column varied by up to 4 orders of magnitude (0.02–213.64 µmol L−1), and all oxic depths were consistently supersaturated in both periods. Phytoplanktonic sources appear to determine the concentration of CH4 in these reservoirs primarily. In anoxic waters, the depth-cumulative chlorophyll a concentration, a proxy for the phytoplanktonic biomass exported to sediments, was correlated to CH4 concentration. In oxic waters, the photosynthetic picoeukaryotes' abundance was significantly correlated to the dissolved CH4 concentration during both the stratification and the mixing. The mean depth of the reservoirs, as a surrogate of the vertical CH4 transport from sediment to the oxic waters, also contributed notably to the CH4 concentration in oxic waters. Our findings suggest that photosynthetic picoeukaryotes can play a significant role in determining CH4 concentration in oxic waters, although their role as CH4 sources to explain the methane paradox has been poorly explored.

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Spatial and seasonal variability of CH 4 in the eastern Gulf of Cadiz (SW Iberian Peninsula)

Cited by 20 publications

References 83 publications

Large Fine‐Scale Spatiotemporal Variations of CH₄ Diffusive Fluxes From Shrimp Aquaculture Ponds Affected by Organic Matter Supply and Aeration in Southeast China

Large Fine‐Scale Spatiotemporal Variations of CH₄ Diffusive Fluxes From Shrimp Aquaculture Ponds Affected by Organic Matter Supply and Aeration in Southeast China

Greenhouse gas fluxes from reservoirs determined by watershed lithology, morphometry, and anthropogenic pressure

Dissolved CH<sub>4</sub> coupled to photosynthetic picoeukaryotes in oxic waters and to cumulative chlorophyll <i>a</i> in anoxic waters of reservoirs

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Spatial and seasonal variability of CH 4 in the eastern Gulf of Cadiz (SW Iberian Peninsula)

Cited by 20 publications

References 83 publications

Large Fine‐Scale Spatiotemporal Variations of CH4 Diffusive Fluxes From Shrimp Aquaculture Ponds Affected by Organic Matter Supply and Aeration in Southeast China

Large Fine‐Scale Spatiotemporal Variations of CH4 Diffusive Fluxes From Shrimp Aquaculture Ponds Affected by Organic Matter Supply and Aeration in Southeast China

Greenhouse gas fluxes from reservoirs determined by watershed lithology, morphometry, and anthropogenic pressure

Dissolved CH&lt;sub&gt;4&lt;/sub&gt; coupled to photosynthetic picoeukaryotes in oxic waters and to cumulative chlorophyll &lt;i&gt;a&lt;/i&gt; in anoxic waters of reservoirs

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Large Fine‐Scale Spatiotemporal Variations of CH₄ Diffusive Fluxes From Shrimp Aquaculture Ponds Affected by Organic Matter Supply and Aeration in Southeast China

Large Fine‐Scale Spatiotemporal Variations of CH₄ Diffusive Fluxes From Shrimp Aquaculture Ponds Affected by Organic Matter Supply and Aeration in Southeast China

Dissolved CH<sub>4</sub> coupled to photosynthetic picoeukaryotes in oxic waters and to cumulative chlorophyll <i>a</i> in anoxic waters of reservoirs