北海道コムケ湖における大気-海水間CO<sub>2</sub>フラックスの空間分布特性と要因分析  [in Japanese] SPATIAL DISTRIBUTION OF AIR-SEA CO<sub>2</sub> FLUX AND ITS INFLUENCING FACTORS AT THE LAKE KOMUKE, HOKKAIDO  [in Japanese]

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Abstract

北海道コムケ湖において現地調査(春季,夏季)を実施し,大気-海水間CO<sub>2</sub>フラックスの空間分布特性の把握を行った.また,大気-海水間CO<sub>2</sub>フラックスに影響を及ぼす環境要因(風速,水温,塩分,全アルカリ度,溶存無機炭素濃度,生物過程による炭素増減量)の相対的な影響度を把握するために,パス解析を用いた分析を行った.その結果,大気-海水間CO<sub>2</sub>フラックスは,湖央付近を中心に大気から海水中へCO<sub>2</sub>の吸収となっており,(1)風速,(2)塩分に起因する流入負荷,そして(3)湖内の生物過程(呼吸・分解,光合成)から影響を受けることがわかった.

 Field investigations were performed to examine environmental factors (wind speed, water temperature, salinity, total alkalinity (TA), dissolved inorganic carbon (DIC), and community metabolism (e.g. ecosystem production and respiration)) affecting air-sea CO<sub>2</sub> flux at the lake Komuke, Japan. We statistically analyzed the observed data using the structured equation modeling (SEM). Specifically, we implemented the path analysis to examine the direct and indirect effects of the environmental factors on the air-sea CO<sub>2</sub> flux. Our results showed that autotrophic sites at central lake can be sinks for atmospheric CO<sub>2</sub>. The key factors directly affecting the air-sea CO<sub>2</sub> flux were indicated to be wind speed and salinity; in turn, the community metabolism were indicated to be an indirect but significant factor.

Journal

  • Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering)

    Journal of Japan Society of Civil Engineers, Ser. B3 (Ocean Engineering) 70(2), I_1188-I_1193, 2014

    Japan Society of Civil Engineers

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