Isoprene emissions from boreal wetlands in Scandinavia

Janson, Robert W; Serves, Claes de

doi:10.1029/98jd01857

Cited by 45 publications

(58 citation statements)

References 13 publications

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“…Linear fit gives the standard emission potential of 680 µg m −2 h −1 with R 2 of 0.70. This agrees well with the results of Janson and De Serves (1998), who reported average standard emission potential of 708 µg m −2 h −1 from flarks of boreal wetlands.…”

Section: Resultssupporting

confidence: 83%

“…The isoprene fluxes from the Siikaneva fen are in same range with the emissions measured from a boreal fen by Janson and De Serves (1998) and Janson et al (1999). The daytime isoprene emission rates from Siikaneva were in the same range than the monoterpene emissions from boreal forests (Rinne et al, 1999(Rinne et al, , 2000a(Rinne et al, , 2000bSpanke et al, 2001).…”

Section: Resultssupporting

confidence: 62%

“…However, according to Klinger et al (1994), Janson and De Serves (1998) and Janson et al (1999) the boreal wetlands emit high amounts of isoprene. Varner et al (1999) and Dimmer et al (2001) reported also emissions of halogenated hydrocarbons, such as methyl chloride, methyl bromide and chloroform, from midlatitude wetlands.…”

Section: Introductionmentioning

confidence: 99%

“…Wetland ecosystems are known as a major source of atmospheric methane (e.g. Enhalt et al, 2001) but they have also been reported to emit volatile organic compounds (Klinger et al, 1994;Janson and De Serves, 1998;Varner et al, 1999;Dimmer et al, 2001;Rinnan et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Measurements of hydrocarbon emissions from a boreal fen using the REA technique

et al. 2006

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Abstract. Fluxes of biogenic volatile organic compounds (VOC) and methane were measured above a boreal fen. Vegetation on the fen is dominated by Sphagnum mosses and sedges. A relaxed eddy accumulation (REA) system with dynamic deadband was designed and constructed for the measurements. Methane, C 2 -C 6 hydrocarbons and some halogenated hydrocarbons were analysed from the samples by gas chromatographs equipped with FID and ECD. A significant flux of isoprene and methane was detected during the growing seasons. Isoprene emission was found to follow the common isoprene emission algorithm. Average standard emission potential of isoprene was 680 µg m −2 h −1 . Fluxes of other non-methane hydrocarbons were below detection limit.

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Section: Resultssupporting

confidence: 83%

Section: Resultssupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Measurements of hydrocarbon emissions from a boreal fen using the REA technique

et al. 2006

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“…around the Baltic Sea near Finland) where constraints on isoprene emissions could be improved by using measurement data that is available in the literature (e.g. Jansen and De Serves, 1998;Lindfors and Laurila, 2000). Recently comparisons of European isoprene mixing ratios calculated online in a CTM with MEGAN against similar EMEP data for 2006 have also shown that there is a wide variability in agreement between different EMEP sites even when including yearly specific meteorological variability during the derivation of emission fluxes (Zare et al, 2012).…”

Section: Isoprenementioning

confidence: 99%

Quantifying the uncertainty in simulating global tropospheric composition due to the variability in global emission estimates of Biogenic Volatile Organic Compounds

2013

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Abstract. The emission of organic compounds from biogenic processes acts as an important source of trace gases in remote regions away from urban conurbations, and is likely to become more important in future decades due to the further mitigation of anthropogenic emissions that affect air quality and climate forcing. In this study we examine the contribution of biogenic volatile organic compounds (BVOCs) towards global tropospheric composition using the global 3-D chemistry transport model TM5 and the recently developed modified CB05 chemical mechanism. By comparing regional BVOC emission estimates we show that biogenic processes act as dominant sources for many regions and exhibit a large variability in the annually and seasonally integrated emission fluxes. By performing sensitivity studies we find that the contribution of BVOC species containing between 1 to 3 carbon atoms has an impact on the resident mixing ratios of tropospheric O3 and CO, accounting for ~2.5% and ~10.8% of the simulated global distribution, respectively. This is approximately a third of the cumulative effect introduced by isoprene and the monoterpenes. By examining an ensemble of 3-D global chemistry transport simulations which adopt different global BVOC emission inventories we determine the associated uncertainty introduced towards simulating the composition of the troposphere for the year 2000. By comparing the model ensemble values against a composite of atmospheric measurements we show that the effects on tropospheric O3 are limited to the lower troposphere (with an uncertainty between −2% to 10%), whereas that for tropospheric CO extends up to the upper troposphere (with an uncertainty of between 10 to 45%). Comparing the mixing ratios for low molecular weight alkenes in TM5 against surface measurements taken in Europe implies that the cumulative emission estimates are too low, regardless of the chosen BVOC inventory. This variability in the global distribution of CO due to BVOC emissions introduces an associated uncertainty in the tropospheric CO burden of 11.4%, which impacts strongly on the oxidative capacity of the troposphere, introducing an uncertainty in the atmospheric lifetime of the greenhouse gas CH4 of ~3.3%. This study thus identifies the necessity of placing further constraints on non-CH4 global biogenic emission estimates in large-scale global atmospheric chemistry models.

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A little relief: Ecological functions and autogenesis of wetland microtopography

et al. 2020

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Microtopography, or the small‐scale variation in ground surface height (10−1–100 m) over short (100–102 m) spatial scales, is a ubiquitous feature of wetlands globally. This variation in elevation, characterized by local high (“hummocks”) and low (“hollows”) patches, is more structured than what is observed in uplands, and is intertwined with concordantly structured spatiotemporal variability in hydrologic regimes and associated ecological processes. The importance of microtopography in wetlands is manifold, with critical influence on local hydrological, biogeochemical, and biological processes. Further, the creation and maintenance of wetland microtopography is a balance between activation processes (i.e., those that induce random elevation variation) and autogenic reinforcement processes (i.e., those that provide the feedbacks necessary for the persistence of microtopography). While there are many mechanisms that create vertical structure (e.g., tree falls, accumulation of roots and soil organic matter, and sediment deposition), they all yield a similar core feedback to enhance and sustain microtopographic structure. Finally, microtopography contributes to spatial patterning that confers emergent ecosystem‐scale functions such as hydrologic storage and flows, carbon cycling, organism dispersal, and biodiversity. There is an ongoing need to study the origins and implications of this fine‐scale variation in elevation, as well as the utility of including microtopography in model predictions and ecological restoration efforts. This article is categorized under: Water and Life > Conservation, Management, and Awareness

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Isoprene emissions from boreal wetlands in Scandinavia

Cited by 45 publications

References 13 publications

Measurements of hydrocarbon emissions from a boreal fen using the REA technique

Measurements of hydrocarbon emissions from a boreal fen using the REA technique

Quantifying the uncertainty in simulating global tropospheric composition due to the variability in global emission estimates of Biogenic Volatile Organic Compounds

A little relief: Ecological functions and autogenesis of wetland microtopography

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