Seasonal dynamics of methane emission from wetlands

Singh, Sunil Kumar; Kulshreshtha, K.; Agnihotri, Savita

doi:10.1016/s1465-9972(99)00046-x

Cited by 71 publications

(53 citation statements)

References 28 publications

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“…4A). The relationship between methanogenesis and temperature (i.e., seasonal, daily) has been documented with Q 10 values from 2.1 to 4 Thomas et al, 1996;Singh et al, 2000). However, Q 10 values based on CH 4 emission at the leaf-atmosphere interface have only been determined in our study.…”

Section: Discussionmentioning

confidence: 77%

Physiological control of leaf methane emission from wetland plants

Garnet¹,

Megonigal²,

Litchfield³

et al. 2005

Aquatic Botany

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Section: Discussionmentioning

confidence: 77%

Physiological control of leaf methane emission from wetland plants

Garnet¹,

Megonigal²,

Litchfield³

et al. 2005

Aquatic Botany

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“…Singh, 2001;Seybold et al, 2002), although pH responses to redox potential and water table can vary widely (e.g. Singh et al, 2000;Thompson et al, 2009). Although seasonal variation in wetland pH as a significant control on CH 4 emissions is a viable hypothesis, to our knowledge there are currently no repeat measurements of pH in response to flooding in tropical wetlands.…”

Section: Resultsmentioning

confidence: 99%

Seasonal variability of tropical wetland CH<sub>4</sub> emissions: the role of the methanogen-available carbon pool

et al. 2012

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Abstract. We develop a dynamic methanogen-available carbon model (DMCM) to quantify the role of the methanogenavailable carbon pool in determining the spatial and temporal variability of tropical wetland CH 4 emissions over seasonal timescales. We fit DMCM parameters to satellite observations of CH 4 columns from SCIAMACHY CH 4 and equivalent water height (EWH) from GRACE. Over the Amazon River basin we found substantial seasonal variability of this carbon pool (coefficient of variation = 28 ± 22 %) and a rapid decay constant (φ = 0.017 day −1 ), in agreement with available laboratory measurements, suggesting that plant litter is likely the prominent methanogen carbon source over this region. Using the DMCM we derived global CH 4 emissions for [2003][2004][2005][2006][2007][2008][2009], and determined the resulting seasonal variability of atmospheric CH 4 on a global scale using the GEOS-Chem atmospheric chemistry and transport model. First, we estimated that tropical emissions amounted to 111.1 Tg CH 4 yr −1 , of which 24 % was emitted from Amazon wetlands. We estimated that annual tropical wetland emissions increased by 3.4 Tg CH 4 yr −1 between 2003 and 2009. Second, we found that the model was able to reproduce the observed seasonal lag of CH 4 concentrations peaking 1-3 months before peak EWH values. We also found that our estimates of CH 4 emissions substantially improved the comparison between the model and observed CH 4 surface concentrations (r = 0.9). We anticipate that these new insights from the DMCM represent a fundamental step in parameterising tropical wetland CH 4 emissions and quantifying the seasonal variability and future trends of tropical CH 4 emissions.

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“…Bloom et al: A global wetland methane emissions and uncertainty dataset inundation extent and temperature (Yvon-Durocher et al, 2014). Other important controls on wetland CH 4 emissions include the presence of macrophytes (Laanbroek, 2010), organic C decomposition rates (Miyajima et al, 1997) and soil pH (Singh et al, 2000), amongst other factors. The link between terrestrial carbon-water cycling and wetland CH 4 emissions is of particular interest from a terrestrial greenhouse gas emissions standpoint: inter-annual variations in terrestrial carbon cycling (Le can affect wetland CH 4 emissions on seasonal to century timescales (Hodson et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

A global wetland methane emissions and uncertainty dataset for atmospheric chemical transport models (WetCHARTs version 1.0)

et al. 2017

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Abstract. Wetland emissions remain one of the principal sources of uncertainty in the global atmospheric methane (CH 4 ) budget, largely due to poorly constrained process controls on CH 4 production in waterlogged soils. Process-based estimates of global wetland CH 4 emissions and their associated uncertainties can provide crucial prior information for model-based top-down CH 4 emission estimates. Here we construct a global wetland CH 4 emission model ensemble for use in atmospheric chemical transport models (WetCHARTs version 1.0). Our 0.5 • × 0.5 • resolution model ensemble is based on satellite-derived surface water extent and precipitation reanalyses, nine heterotrophic respiration simulations (eight carbon cycle models and a data-constrained terrestrial carbon cycle analysis) and three temperature dependence parameterizations for the period 2009-2010; an extended ensemble subset based solely on precipitation and the data-constrained terrestrial carbon cycle analysis is derived for the period 2001-2015. We incorporate the mean of the full and extended model ensembles into GEOS-Chem and compare the model against surface measurements of atmospheric CH 4 ; the model performance (site-level and zonal mean anomaly residuals) compares favourably against published wetland CH 4 emissions scenarios. We find that uncertainties in carbon decomposition rates and the wetland extent together account for more than 80 % of the dominant uncertainty in the timing, magnitude and seasonal variability in wetland CH 4 emissions, although uncertainty in the temperature CH 4 : C dependence is a significant contributor to seasonal variations in mid-latitude wetland CH 4 emissions. The combination of satellite, carbon cycle models and temperature dependence parameterizations provides a physically informed structural a priori uncertainty that is critical for topdown estimates of wetland CH 4 fluxes. Specifically, our ensemble can provide enhanced information on the prior CH 4 emission uncertainty and the error covariance structure, as well as a means for using posterior flux estimates and their uncertainties to quantitatively constrain the biogeochemical process controls of global wetland CH 4 emissions.

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Seasonal dynamics of methane emission from wetlands

Cited by 71 publications

References 28 publications

Physiological control of leaf methane emission from wetland plants

Physiological control of leaf methane emission from wetland plants

Seasonal variability of tropical wetland CH<sub>4</sub> emissions: the role of the methanogen-available carbon pool

A global wetland methane emissions and uncertainty dataset for atmospheric chemical transport models (WetCHARTs version 1.0)

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Seasonal dynamics of methane emission from wetlands

Cited by 71 publications

References 28 publications

Physiological control of leaf methane emission from wetland plants

Physiological control of leaf methane emission from wetland plants

Seasonal variability of tropical wetland CH&lt;sub&gt;4&lt;/sub&gt; emissions: the role of the methanogen-available carbon pool

A global wetland methane emissions and uncertainty dataset for atmospheric chemical transport models (WetCHARTs version 1.0)

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Seasonal variability of tropical wetland CH<sub>4</sub> emissions: the role of the methanogen-available carbon pool