Interannual variability in the peatland‐atmosphere carbon dioxide exchange at an ombrotrophic bog

Lafleur, Peter M.; Roulet, Nigel T.; Bubier, Jill L.; Frolking, Steve; Moore, Tim R.

doi:10.1029/2002gb001983

Cited by 335 publications

(396 citation statements)

References 51 publications

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“…We used an in-house Matlab (Mathworks, Natick, MA) script to do a first automated quality control of the 30-min flux and climate data following the established FCRN (Fluxnet-Canada Research Network) guidelines (Lafleur et al 2003;Roulet et al 2007). The quality control procedure followed Bergeron and Strachan (2011) and included the removal of raw high-frequency data spikes (Vickers and Mahrt 1997) and out-of-range data points (e.g.…”

Section: Instrumentation and Flux Calculationsmentioning

confidence: 99%

Inter-annual variability in water table depth controls net ecosystem carbon dioxide exchange in a boreal bog

2015

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The net ecosystem carbon dioxide (CO 2 ) exchange (NEE) between boreal bogs and the atmosphere and its environmental drivers remains understudied despite the large carbon store of these northern ecosystems. We present NEE measurements using the eddy covariance technique in a boreal ombrotrophic bog over five growing seasons and four winters. Interannual variability in CO 2 uptake was most pronounced in June-September (-4 to -122 g CO 2 -C m -2 ), less in March-May (-1 to -21 g CO 2 -C m -2 ) and very small in October-November (-2 to -4 g CO 2 -C m -2 ). Variability in NEE between years was linked primarily to changes in water table depth (WTD). Strong and significant relationships (r 2 [ 0.89, p B 0.05) were found between summer (JuneSeptember) maximum photosynthetic rate (A max ), net ecosystem productivity (NEP), gross ecosystem productivity and WTD. Adding air temperature through multiple regression analysis further increased correlation between summer A max , NEP, and WTD (r 2 = 0.96, p = 0.05). In contrast to previous studies examining controls on peatland CO 2 exchange, no relationships were found between productivity or cumulative exchange and early season temperature, timing of the snowmelt or growing season length.

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Section: Instrumentation and Flux Calculationsmentioning

confidence: 99%

Inter-annual variability in water table depth controls net ecosystem carbon dioxide exchange in a boreal bog

2015

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“…For atmospheric flux measurements, northern wetland and permafrost ecosystems are relatively well covered with a reasonable spread across the circumpolar North (e.g. Oechel et al 2000;Nordstroem et al 2001;Aurela et al 2002;Lafleur et al 2003;Friborg et al 2004;in prep. ;Corradi et al 2005), whilst more CO 2 and CH 4 flux monitoring stations in tropical wetlands are needed.…”

Section: Data For Wetlands/peatlandsmentioning

confidence: 99%

Sectoral approaches to improve regional carbon budgets

et al. 2008

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Humans utilise about 40% of the earth's net primary production (NPP) but the products of this NPP are often managed by different sectors, with timber and forest products managed by the forestry sector and food and fibre products from croplands and grasslands managed by the agricultural sector. Other significant anthropogenic impacts on Climatic Change (2008) the global carbon cycle include human utilization of fossil fuels and impacts on less intensively managed systems such as peatlands, wetlands and permafrost. A great deal of knowledge, expertise and data is available within each sector. We describe the contribution of sectoral carbon budgets to our understanding of the global carbon cycle. Whilst many sectors exhibit similarities for carbon budgeting, some key differences arise due to differences in goods and services provided, ecology, management practices used, landmanagement personnel responsible, policies affecting land management, data types and availability, and the drivers of change. We review the methods and data sources available for assessing sectoral carbon budgets, and describe some of key data limitations and uncertainties for each sector in different regions of the world. We identify the main gaps in our knowledge/data, show that coverage is better for the developed world for most sectors, and suggest how sectoral carbon budgets could be improved in the future. Research priorities include the development of shared protocols through site networks, a move to full carbon accounting within sectors, and the assessment of full greenhouse gas budgets.

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“…In this paper we focus on hydrological dynamics of peatlands, as the water balance of peatlands plays a critical role in their carbon balance (Lafleur et al, 2003). Kettridge et al (2013) showed the importance of peatland hydrology as a regulatory control on carbon dynamics and the future stability of peatland carbon stocks and regional water dynamics.…”

Section: Introductionmentioning

confidence: 99%

Representing northern peatland microtopography and hydrology within the Community Land Model

et al. 2015

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Abstract. Predictive understanding of northern peatland hydrology is a necessary precursor to understanding the fate of massive carbon stores in these systems under the influence of present and future climate change. Current models have begun to address microtopographic controls on peatland hydrology, but none have included a prognostic calculation of peatland water table depth for a vegetated wetland, independent of prescribed regional water tables. We introduce here a new configuration of the Community Land Model (CLM) which includes a fully prognostic water table calculation for a vegetated peatland. Our structural and process changes to CLM focus on modifications needed to represent the hydrologic cycle of bogs environment with perched water tables, as well as distinct hydrologic dynamics and vegetation communities of the raised hummock and sunken hollow microtopography characteristic of peatland bogs. The modified model was parameterized and independently evaluated against observations from an ombrotrophic raised-dome bog in northern Minnesota (S1-Bog), the site for the Spruce and Peatland Responses Under Climatic and Environmental Change experiment (SPRUCE). Simulated water table levels compared well with site-level observations. The new model predicts hydrologic changes in response to planned warming at the SPRUCE site. At present, standing water is commonly observed in bog hollows after large rainfall events during the growing season, but simulations suggest a sharp decrease in water table levels due to increased evapotranspiration under the most extreme warming level, nearly eliminating the occurrence of standing water in the growing season. Simulated soil energy balance was strongly influenced by reduced winter snowpack under warming simulations, with the warming influence on soil temperature partly offset by the loss of insulating snowpack in early and late winter. The new model provides improved predictive capacity for seasonal hydrological dynamics in northern peatlands, and provides a useful foundation for investigation of northern peatland carbon exchange.

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Interannual variability in the peatland‐atmosphere carbon dioxide exchange at an ombrotrophic bog

Cited by 335 publications

References 51 publications

Inter-annual variability in water table depth controls net ecosystem carbon dioxide exchange in a boreal bog

Inter-annual variability in water table depth controls net ecosystem carbon dioxide exchange in a boreal bog

Sectoral approaches to improve regional carbon budgets

Representing northern peatland microtopography and hydrology within the Community Land Model

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