Micrometeorological measurements of methane flux at a boreal forest in central Alaska

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Author(s)

Abstract

Methane (CH_4) flux at a black spruce forest in central Alaska was determined by applying the three types of modified gradient method. One type used the eddy diffusivity obtained by CO_2 flux and CO_2 gradient. Others established the flux gradient relationship assuming Monin-Obukhov similarity. The wind speed and temperature profile functions were corrected for the influence of the roughness sublayer, and then applied to the modified gradient methods. More than 70% of the data were rejected by the strict quality control and a continental climate, such as calm wind. Although the diurnal variations of CH_4 flux by the three methods were different, the seasonal variation showed similar tendency; a weak emission on snowpack, an obvious emission around spring thaw, and CH_4 uptake in the late growing season. As calculated CH_4 flux was in the same range as with previous studies conducted by the chamber measurement.

Journal

  • Memoirs of National Institute of Polar Research. Special issue

    Memoirs of National Institute of Polar Research. Special issue 59, 156-167, 2006-03

    National Institute of Polar Research

Codes

  • NII Article ID (NAID)
    110004595728
  • NII NACSIS-CAT ID (NCID)
    AA00733561
  • Text Lang
    ENG
  • ISSN
    03860744
  • Data Source
    NII-ELS 
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