Seasonal variation of DOC concentration and annual loss of DOC from an Atlantic blanket bog in South Western Ireland

Koehler, Ann‐Kristin; Murphy, Kilian; Kiely, Gerard; Sottocornola, Matteo

doi:10.1007/s10533-009-9333-9

Cited by 74 publications

(87 citation statements)

References 41 publications

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“…The estimated export of the two carbon fractions for 2010, 9.5 t C km 2 year -1 for DOC and 6.2 t C km 2 year -1 for POC, are within the range reported in other studies from peatland catchments (Naden et al, 2010;Koehler et al, 2009;Agren et al, 2007;Clark et al, 2007;May et al, 2005;Worrall et al, 2003;Hope et al, 1997). On an annual basis, the POC load was estimated to represent just under 40 % of the combined POC and DOC load.…”

Section: Discussionsupporting

confidence: 84%

“…Carbon is exported in a number of different forms from these systems, including as dissolved inorganic carbon (DIC), dissolved organic carbon (DOC) and particulate organic carbon (POC) in catchment streams, and as gaseous emissions of carbon dioxide (CO 2 ) and methane (CH 4 ) from soil carbon stores (Dinsmore et al, 2011). Published estimates of DOC export range from 1.5 t C km 2 year -1 to 14.2 t C km 2 year -1 (Koehler et al, 2009;Clark et al, 2007;Worrall et al, 2003;Hope et al, 1997) while estimates of POC export range from 0.1 t C km 2 year -1 to 31.7 t C km 2 year -1 (May et al, 2005;Worrell et al, 2003;Hope et al, 1997). Despite the potential for these two carbon sources to contribute to greenhouse gas emissions when mineralised (Davidson and Janssens, 2006), DOC and POC export from peat stores are often ignored in catchment studies, and are generally not included in national greenhouse gas emissions budgets (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Identifying the role of environmental drivers in organic carbon export from a forested peat catchment

Ryder

Eyto

Dillane

et al. 2014

Science of The Total Environment

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Highlights:1. Loads of 9.5 t DOC km 2 year -1 and 6.2 t POC km 2 year -1 were exported from peatland. 2.Climatic factors explained 59.7% and 58.3% of deviance in stream DOC and POC.3. Soil temperature, discharge and drought were significant drivers of DOC concentrations. 4.Soil temperature, stream discharge rainfall were significant drivers of POC concentrations.Key words: Peat catchment, dissolved organic carbon, particulate organic carbon, high resolution monitoring, climate effects. AbstractCarbon export in streams draining peat catchments represents a potential loss of carbon from longterm stores to downstream aquatic systems and ultimately, through mineralisation, to the atmosphere. There is now a large body of evidence that dissolved organic carbon (DOC) export has 2 increased significantly in recent decades at many sites, although there is still debate about the drivers of this increase. In this study, DOC export and particulate organic carbon (POC) export were quantified from a forested peatland catchment in the west of Ireland over two years at a fine temporal resolution. The principle drivers of change in stream DOC and POC concentrations were investigated using a general additive modelling (GAM) approach. The study period included drought conditions in early summer 2010 and clearfelling of some commercial forestry in early 2011. The results indicated that annual loads of 9.5 t DOC km 2 year -1 and 6.2 t POC km 2 year -1 were exported from the catchment in 2010. This combined annual load of 15.7 t C km 2 year -1 would represent between 0.01 % and 0.02 % of typical estimates for peat soil carbon storage in the region. Soil temperature, river discharge and drought explained 59.7 % the deviance in DOC concentrations, while soil temperature, river discharge, and rainfall were the significant drivers of variation in POC concentrations, explaining 58.3 % of deviance. Although clearfelling was not a significant factor in either model, large spikes in POC export occurred in 2011 after the first forestry clearance. The results illustrate the complexity of the interactions between climate and land management in driving stream water carbon export. They also highlight the sensitivity of peatland carbon stores to changes in temperature and precipitation, which are projected to be more extreme and variable under future climate scenarios.3

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Section: Discussionsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Identifying the role of environmental drivers in organic carbon export from a forested peat catchment

Ryder

Eyto

Dillane

et al. 2014

Science of The Total Environment

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“…For example the driest year of the study period, 2013, displayed the minimum yield. The estimated annual yields reported here are broadly in line with the 9.5 t C km 2 yr -1 and 13.7 t C km 2 yr -1 estimated DOC export from the Glenamong sub-catchment in 2010 and 2011 10 respectively (Ryder et al 2014) and broadly within the ranges reported in other studies from peatland catchments (Naden et al 2010;Koehler et al 2009;Clark et al 2007) …”

Section: Carbon Export From the Sub-catchmentssupporting

confidence: 90%

Synchrony in catchment stream colour levels is driven by both local and regional climate

Doyle¹,

Eyto²,

Dillane³

et al. 2018

Preprint

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Abstract. Streams draining upland catchments mobilise significant loads of carbon from terrestrial reservoirs to downstream freshwater and marine aquatic ecosystems and ultimately, via a range of biotic and abiotic processes, to the atmosphere. 5There are increasing concerns over the long-term stability of terrestrial carbon stores in blanket peatland catchments as a result of anthropogenic pressures and climate change. We analysed sub-annual and inter-annual changes in river water colour (a reliable proxy measurement of dissolved organic carbon (DOC)) using six years of weekly data (2011 to 2016) from three contiguous river sub-catchments (Black, Glenamong and Srahrevagh) in a blanket peatland catchment system in western Ireland, assessing differences in catchment characteristics and in the drivers of temporal change. General additive mixed 10 modelling was used to identify the principle environmental drivers controlling changes in colour concentration in the rivers, while wavelet cross correlation analysis was used to identify common frequencies. Although at 130 mg PtCo L -1 , the colour levels in the Srahrevagh (the subcatchment with lower rainfall and higher forest cover) were almost 50% higher than those from the Black and Glenamong, 95 and 84 mg Pt Co L -1 respectively. The decomposition of the colour datasets revealed similar multi-annual, annual, and event-based (random component) trends, illustrating that environmental drivers operated 15 synchronously at each of these temporal scales, and also spatially within the same catchment. For the Black and its nested Srahrevagh catchment, soil temperature, soil moisture deficit and the weekly North Atlantic Oscillation (NAO) explained 54% and 58% of the deviance in colour respectively. In the Glenamong, which had steeper topography and a higher percentage of peat intersected by streams, soil temperature, log of discharge and the NAO explained 66% of the colour concentrations. Cross-wavelet time-series analysis between river colour and each environmental driver revealed a significant 20 high common power relationship at an annual time step. Each each relationship however, varied in phase, further highlighting the complexity of the mechanisms driving river colour in the sub-catchments. The estimated mean annual DOC loads for the Black and Glenamong rivers to Lough Feeagh were 15 t C km 2 yr -1 and 14.7 t C km 2 yr -1 respectively, although the export values displayed significant inter-annual variation. The results of the study highlight the interaction of catchment conditions and regional meteorological drivers of aquatic carbon export and, therefore the vulnerability of blanket peatland 25 carbon stores to changes in temperature and precipitation. These changes are presently being observed and are predicted to become increasingly extreme and variable.

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“…This equates to a fluvial TOC flux per unit area over the whole catchment (5200 km 2 ) of 88 g C m −2 yr −1 , a figure which far exceeds those reported for northern peatlands (10-30 g C m −2 yr −1 ; Billet et al, 2010;Koehler et al, 2009;Nilsson et al, 2008). The entire land area of Indonesia is ∼1.9 × 10 6 km 2 of which over 10% (206 950 km 2 ) is covered by peat soils (Page et al, 2010).…”

Section: Dry Season Vs Wet Seasonmentioning

confidence: 84%

Fluvial organic carbon losses from a Bornean blackwater river

et al. 2011

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Abstract.Concentrations of dissolved organic carbon (DOC) and particulate organic carbon (POC) were analysed from the source to the mouth of the River Sebangau in Central Kalimantan, Indonesia during the dry and wet seasons in 2008/2009 and an annual total organic carbon (TOC) flux estimated. DOC concentrations were higher and POC concentrations lower in the wet season compared to the dry season. As seen in other tropical blackwater rivers, DOC concentration is consistently around 10 times greater than POC concentration. We estimate the annual TOC flux discharged to the Java Sea to be 0.46 Tg year −1 comprising of 93% (0.43 Tg) DOC and 7% (0.03 Tg) POC. This equates to a fluvial TOC loss flux per unit area over the entire Sebangau catchment of 88 g C m −2 yr −1 . When extrapolating the River Sebangau DOC loss flux (83 g C m −2 yr −1 ) to the peat covered area of Indonesia (206 950 km 2 ), we estimate a DOC loss of 17.2 Tg C yr −1 or ∼10% of current estimates of the global annual riverine DOC discharge into the ocean.

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Seasonal variation of DOC concentration and annual loss of DOC from an Atlantic blanket bog in South Western Ireland

Cited by 74 publications

References 41 publications

Identifying the role of environmental drivers in organic carbon export from a forested peat catchment

Identifying the role of environmental drivers in organic carbon export from a forested peat catchment

Synchrony in catchment stream colour levels is driven by both local and regional climate

Fluvial organic carbon losses from a Bornean blackwater river

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