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  • 1
    Online Resource
    Online Resource
    Large contribution of boreal upland forest soils to a catchment‐scale CH 4 balance in a wet year
    American Geophysical Union (AGU) ; 2016
    In:  Geophysical Research Letters Vol. 43, No. 6 ( 2016-03-28), p. 2946-2953
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 43, No. 6 ( 2016-03-28), p. 2946-2953
    Abstract: In a wet fall, upland forest turns from a CH 4 sink to source, while wetland emissions do not change The monthly catchment‐scale emission from upland forest can be more than twice that from wetlands Upland forests in the boreal zone may constitute an important part in the global CH 4 cycle
    Type of Medium: Online Resource
    ISSN: 0094-8276 , 1944-8007
    URL: Issue
    URL: Article
    DOI: 10.1002/grl.v43.6
    DOI: 10.1002/2016GL067718
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2016
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    SSG: 16,13
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  • 2
    Online Resource
    Online Resource
    Peatland Heterogeneity Impacts on Regional Carbon Flux and Its Radiative Effect Within a Boreal Landscape
    American Geophysical Union (AGU) ; 2022
    In:  Journal of Geophysical Research: Biogeosciences Vol. 127, No. 9 ( 2022-09)
    Details
    In: Journal of Geophysical Research: Biogeosciences, American Geophysical Union (AGU), Vol. 127, No. 9 ( 2022-09)
    Abstract: The atmosphere‐ecosystem carbon exchange of a heterogeneous boreal landscape was determined Peatlands (26% area) contributed 22% total carbon dioxide (CO 2 ) uptake and 89% methane (CH 4 ) emission; forests offset 6% CH 4 emission and water bodies 7% CO 2 uptake Differentiating between noninundated drier and inundated wetter peatlands improved radiative effect estimates
    Type of Medium: Online Resource
    ISSN: 2169-8953 , 2169-8961
    URL: Article
    DOI: 10.1029/2021JG006774
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2022
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    SSG: 16,13
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  • 3
    Online Resource
    Online Resource
    Measuring methane emissions from a landfill using a cost-effective micrometeorological method : MEASURING METHANE EMISSIONS
    American Geophysical Union (AGU) ; 2005
    In:  Geophysical Research Letters Vol. 32, No. 19 ( 2005-10), p. n/a-n/a
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 32, No. 19 ( 2005-10), p. n/a-n/a
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2005GL023462
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2005
    detail.hit.zdb_id: 2021599-X
    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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  • 4
    Online Resource
    Online Resource
    Resistances to ozone deposition to a flark fen in the northern aapa mire zone
    American Geophysical Union (AGU) ; 1998
    In:  Journal of Geophysical Research: Atmospheres Vol. 103, No. D14 ( 1998-07-27), p. 16953-16966
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 103, No. D14 ( 1998-07-27), p. 16953-16966
    Abstract: We present results of eddy covariance measurements of ozone deposition to a subarctic aapa mire. The measurements were performed in northern Finland in August‐September 1995. The aim of the study is to quantify the ozone flux to this specific surface type and interpret the observations in terms of the resistance analogy model for dry deposition. The dry deposition velocity of ozone had a weak diurnal cycle, the hourly means within this cycle ranging from 0.15 to 0.2 cm s −1 . The bulk surface resistance was on average about 400 s m −1 during the daytime and 480 s m −1 in the dark. The small day‐to‐night difference indicates only a weak dependence on radiation. The independence of the sublayer Stanton number on flow, which is approximately valid for surfaces of permeable vegetation, was found to fail for the present surface, which exhibits a pronounced hummock‐hollow pattern. This adds to the uncertainty in determining the surface resistance as a residual in the resistance system. Comparisons of observations with two general‐purpose parameterizations of the surface resistance indicate that these tend to overestimate the light sensitivity of surface‐related resistances. The overall performance of these schemes much depends on the actual implementation with respect to land‐use data and seasonal definitions.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/98JD01165
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1998
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    SSG: 16,13
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  • 5
    Online Resource
    Online Resource
    Annual CO 2 balance of a subarctic fen in northern Europe: Importance of the wintertime efflux
    American Geophysical Union (AGU) ; 2002
    In:  Journal of Geophysical Research: Atmospheres Vol. 107, No. D21 ( 2002-11-16)
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 107, No. D21 ( 2002-11-16)
    Abstract: The annual balance of CO 2 was measured on a subarctic flark fen located in northern Finland (69°08′N, 27°17′E). Measurements were conducted using the micrometeorological eddy covariance method during the period from April 1998 to April 1999. Special emphasis was put on the importance of the wintertime CO 2 balance as a component of the annual budget. The CO 2 fluxes observed during the winter were relatively small (0.0055 mg CO 2 m −2 s −1 ), but due to the long duration of the snow cover period, they play an important role in the annual balance of CO 2 . The efflux during the coldest periods, when soil surface temperatures fell below −10 °C, was enabled by markedly higher peat temperatures (close to 0 °C) in deeper layers. The typical nighttime respiration observed in summer was 0.10 mg CO 2 m −2 s −1 . The net photosynthesis had a typical daytime peak value of about −0.20 mg CO 2 m −2 s −1 in July. Corresponding with the instantaneous CO 2 fluxes, the highest daily sink balances of about −9 g CO 2 m −2 d −1 were observed in July, while the highest daily respiration balances of about 2.5 g CO 2 m −2 d −1 were observed before and after the sink period. The CO 2 balance for the winter period (105 g CO 2 m −2 ) was greater than the absolute value of the total annual balance (−68 g CO 2 m −2 ), which shows the importance of the wintertime efflux. After taking into account estimates for CH 4 efflux and carbon leaching, an annual carbon balance of −7 ± 5 g C m −2 was obtained for the fen.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2002JD002055
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2002
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    SSG: 16,13
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  • 6
    Online Resource
    Online Resource
    Seasonal CO 2 balances of a subarctic mire
    American Geophysical Union (AGU) ; 2001
    In:  Journal of Geophysical Research: Atmospheres Vol. 106, No. D2 ( 2001-01-27), p. 1623-1637
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 106, No. D2 ( 2001-01-27), p. 1623-1637
    Abstract: Micrometeorological measurements of CO 2 and energy fluxes were carried out in a peatland ecosystem in northern Finland (69°08′N, 27°17′E) during a measurement period from April to the end of October 1997. The summer of 1997 was exceptionally warm and dry as compared to the climatological normal period of 1961–1990, and the effects of the high temperature and lowered water table were clearly seen in the CO 2 fluxes. The highest individual downward flux densities of about −0.25 mg(CO 2 ) m −2 s −1 took place at the end of July, while the highest respiration rates of 0.15 mg(CO 2 ) m −2 s −1 were observed later in August. During the first days of measurements in April the median of respiration flux densities through the snow cover was about 0.006 mg(CO 2 ) m −2 s −1 . In correspondence to the CO 2 fluxes the strongest sink terms in the daily net ecosystem exchange (NEE) balances of about −6 g(CO 2 ) m −2 d −1 were observed in July. The highest positive balances of about 4 g(CO 2 ) m −2 d −1 were observed in early June and in August. The daily balances in April were about 0.6 g(CO 2 ) m −2 d −1 . The net balances for the sink period (June 15 to August 26, 1997) and for the 6‐month measurement period were −188 g m −2 and −30 g m −2 , respectively. The wintertime CO 2 balance was estimated by modeling the NEE using the NEE values from the first measurement week in April. The wintertime balances obtained yielded estimates for annual balances in the range of 62 to 72 g m −2 yr −1 .
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2000JD900481
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2001
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    detail.hit.zdb_id: 3094167-2
    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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  • 7
    Online Resource
    Online Resource
    Carbon dioxide exchange in a subarctic peatland ecosystem in northern Europe measured by the eddy covariance technique
    American Geophysical Union (AGU) ; 1998
    In:  Journal of Geophysical Research: Atmospheres Vol. 103, No. D10 ( 1998-05-27), p. 11289-11301
    Details
    In: Journal of Geophysical Research: Atmospheres, American Geophysical Union (AGU), Vol. 103, No. D10 ( 1998-05-27), p. 11289-11301
    Abstract: Micrometeorological measurements of carbon dioxide and energy fluxes were made on a mesotrophic flark fen in northern Finland (69°08′N, 27°17′E). The measurements were conducted from August 15 to September 13, 1995, the period extending from the intense phase of the growing season through its decline. The objective was to assess the net CO 2 balance on a daily basis during the crucial time of the fen turning from a net sink to a net source of CO 2 . A clear decline in the CO 2 fluxes was observed due to the senescence of the vascular plants at the end of August. The hourly median of daytime fluxes decreased from −0.12 to −0.04 mg m −2 s −1 from August to September. The nighttime fluxes decreased simultaneously from 0.07 to 0.04 mg m −2 s −1 . A simple photosynthetically active radiation (PAR) driven net ecosystem exchange model was used to patch up the time series for calculating the diurnal balances. The value of the model parameter of maximal gross photosynthetic uptake changed from −0.320 to −0.134 mg m −2 s −1 from August to September. The value of α (initial slope of net ecosystem exchange versus PAR) changed, correspondingly, from −0.888 to −0.480 μg μmol −1 . The highest negative daily balances at the beginning of the period were about −2 g m −2 d −1 . During the first days of September they rose to 3 g m −2 d −1 , but decreased to 1 g m −2 d −1 at the end of the measurements.
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/98JD00481
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1998
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    detail.hit.zdb_id: 161665-1
    detail.hit.zdb_id: 3094268-8
    detail.hit.zdb_id: 710256-2
    detail.hit.zdb_id: 2016804-4
    detail.hit.zdb_id: 3094181-7
    detail.hit.zdb_id: 3094219-6
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    detail.hit.zdb_id: 2220777-6
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    SSG: 16,13
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  • 8
    Online Resource
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    Lateral expansion and carbon exchange of a boreal peatland in Finland resulting in 7000 years of positive radiative forcing
    American Geophysical Union (AGU) ; 2017
    In:  Journal of Geophysical Research: Biogeosciences Vol. 122, No. 3 ( 2017-03), p. 562-577
    Details
    In: Journal of Geophysical Research: Biogeosciences, American Geophysical Union (AGU), Vol. 122, No. 3 ( 2017-03), p. 562-577
    Abstract: Macrofossils, carbon accumulation, and age data from several cores were used to reconstruct three‐dimensional development of a Finnish bog The site experienced a spatially asynchronous succession leading to heterogeneous carbon dynamics Low carbon uptake and expansion of fen area caused 7000 year period of positive radiative forcing
    Type of Medium: Online Resource
    ISSN: 2169-8953 , 2169-8961
    URL: Issue
    URL: Article
    DOI: 10.1002/jgrg.v122.3
    DOI: 10.1002/2016JG003749
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2017
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    detail.hit.zdb_id: 2220777-6
    SSG: 16,13
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  • 9
    Online Resource
    Online Resource
    Forestation of boreal peatlands: Impacts of changing albedo and greenhouse gas fluxes on radiative forcing
    American Geophysical Union (AGU) ; 2010
    In:  Journal of Geophysical Research Vol. 115, No. G4 ( 2010-10-12)
    Details
    In: Journal of Geophysical Research, American Geophysical Union (AGU), Vol. 115, No. G4 ( 2010-10-12)
    Type of Medium: Online Resource
    ISSN: 0148-0227
    URL: Article
    DOI: 10.1029/2010JG001327
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2010
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    detail.hit.zdb_id: 2220777-6
    detail.hit.zdb_id: 3094197-0
    SSG: 16,13
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