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

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概要

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• 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.

• 国立極地研究所の論文

著者

• Ohtaki Eiji

  Graduate School Of Natural Science And Technology Okayama University

• Ueyama Masahito

  International Arctic Research Center, University of Alaska

• Harazono Yoshinobu

  International Arctic Research Center, University of Alaska

• Okada Ryo

  Institution of Geosciences, University of Tsukuba

• Nojiri Atsushi

  Graduate School of Natural Science and Technology, Okayama University

• Miyata Akira

  National Institute of Agro-Environmental Sciences

• Okada Ryo

  Institution Of Geosciences University Of Tsukuba

• Nojiri Atsushi

  Graduate School Of Natural Science And Technology Okayama University

• Harazono Yoshinobu

  International Arctic Research Center University Of Alaska

• Ueyama Masahito

  International Arctic Research Center University Of Alaska

• Miyata Akira

  National Institute For Agro-environmental Sciences

関連論文

• Micrometeorological measurements of methane flux at a boreal forest in central Alaska
• Temporal and spatial differences of methane flux at arctic tundra in Alaska
• A review of tower flux observation sites in Asia
• Climatic physical snowpack properties for large-scale modeling examined by observations and a physical model
• Variations in fraction of absorbed photosynthetically active radiation and comparisons with MODIS data in burned black spruce forests of interior Alaska
• Site-level model-data synthesis of terrestrial carbon fluxes in the CarboEastAsia eddy-covariance observation network : toward future modeling efforts
• Dataset of CarboEastAsia and uncertainties in the CO_2 budget evaluation caused by different data processing

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