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    Seasonal Variations in Isoprene Emissions from a Boreal Aspen Forest

    Source: Journal of Applied Meteorology:;1999:;volume( 038 ):;issue: 007::page 855
    Author:
    Fuentes, J. D.
    ,
    Wang, D.
    ,
    Gu, L.
    DOI: 10.1175/1520-0450(1999)038<0855:SVIIEF>2.0.CO;2
    Publisher: American Meteorological Society
    Abstract: The primary objective of this study was to understand the environmental and seasonal controls over isoprene emissions from a boreal forest ecosystem whose isoprene source came from trees of the same species and age. A further objective was to establish an annual budget of isoprene emitted from a remote boreal forest and thus assess uncertainties associated with seasonal isoprene emission inventories. The onset of isoprene emissions occurred two weeks after the forest attained its maximum leaf area. Scaled to the foliage level, averaged isoprene fluxes approached 10 ± 5 nmol m?2 s?1 in the spring. During the middle of the growing season averaged isoprene emissions amounted to 28 ± 4 nmol m?2 s?1, whereas late summer values reached 16 ± 2 mmol m?2 s?1. These isoprene capacities were normalized to 25°C and photosynthetically active radiation of 1000 ?mol m?2 s?1. Given the strong seasonality observed in isoprene emissions, the authors propose to include seasonally adjusted emission rates to derive isoprene inventories for the entire foliage growing cycle. With an active biomass of 144 g m?2, using a seasonally adjusted emission rate in a one-dimensional multilayered model it is estimated that during 1994 the boreal aspen forest emitted 32 ?mol of isoprene per square meter. Such isoprene source strength represented approximately 1% of the photosynthetically fixed carbon by the aspen forest. In addition to the seasonal controls dictated by the inherent plant metabolic activity, low temperatures (<10°C) strongly reduced the amplitude of diurnal isoprene emissions.
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      Seasonal Variations in Isoprene Emissions from a Boreal Aspen Forest

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4148105
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    contributor authorFuentes, J. D.
    contributor authorWang, D.
    contributor authorGu, L.
    date accessioned2017-06-09T14:07:01Z
    date available2017-06-09T14:07:01Z
    date copyright1999/07/01
    date issued1999
    identifier issn0894-8763
    identifier otherams-12733.pdf
    identifier urihttp://onlinelibrary.yabesh.ir/handle/yetl/4148105
    description abstractThe primary objective of this study was to understand the environmental and seasonal controls over isoprene emissions from a boreal forest ecosystem whose isoprene source came from trees of the same species and age. A further objective was to establish an annual budget of isoprene emitted from a remote boreal forest and thus assess uncertainties associated with seasonal isoprene emission inventories. The onset of isoprene emissions occurred two weeks after the forest attained its maximum leaf area. Scaled to the foliage level, averaged isoprene fluxes approached 10 ± 5 nmol m?2 s?1 in the spring. During the middle of the growing season averaged isoprene emissions amounted to 28 ± 4 nmol m?2 s?1, whereas late summer values reached 16 ± 2 mmol m?2 s?1. These isoprene capacities were normalized to 25°C and photosynthetically active radiation of 1000 ?mol m?2 s?1. Given the strong seasonality observed in isoprene emissions, the authors propose to include seasonally adjusted emission rates to derive isoprene inventories for the entire foliage growing cycle. With an active biomass of 144 g m?2, using a seasonally adjusted emission rate in a one-dimensional multilayered model it is estimated that during 1994 the boreal aspen forest emitted 32 ?mol of isoprene per square meter. Such isoprene source strength represented approximately 1% of the photosynthetically fixed carbon by the aspen forest. In addition to the seasonal controls dictated by the inherent plant metabolic activity, low temperatures (<10°C) strongly reduced the amplitude of diurnal isoprene emissions.
    publisherAmerican Meteorological Society
    titleSeasonal Variations in Isoprene Emissions from a Boreal Aspen Forest
    typeJournal Paper
    journal volume38
    journal issue7
    journal titleJournal of Applied Meteorology
    identifier doi10.1175/1520-0450(1999)038<0855:SVIIEF>2.0.CO;2
    journal fristpage855
    journal lastpage869
    treeJournal of Applied Meteorology:;1999:;volume( 038 ):;issue: 007
    contenttypeFulltext
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