Spatial and temporal distribution of carbon dioxide flux in Amagasaki Canal, Japan
Spatial and temporal distribution of carbon dioxide flux in Amagasaki Canal, Japan
复制标题
日本尼崎运河二氧化碳通量时空分布
DOI：
10.1080/21664250.2021.1964231
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发表时间：
2021
影响因子：
2.4
通讯作者：
Hirata Masayuki
中科院分区：
文献类型：
--
作者：
Otani Sosuke;Yamanaka Ryoichi;Kozuki Yasunori;Fujishima Kohei;Hirata Masayuki
最近，蓝碳--沿海生态系统捕获的碳--因其封存人为CO2的潜力而受到越来越多的研究关注。日本大坂湾内的天崎运河营养盐浓度高，浮游植物丰富;在这种富营养环境中，浮游植物的初级生产力很高。这可能导致大气中二氧化碳的吸收增强。以天崎运河为研究对象，分析了运河水质和CO2通量的时空变化特征，并利用协方差结构分析法分析了运河水体中CO2分压（pCO 2）的影响因素。运河中的CO2通量在−24.9和66.8 mmol-C/m2/d之间变化。水质存在季节性变化，秋冬季有CO2释放的趋势。春、夏季浮游植物活跃，叶绿素a浓度高，溶解无机碳浓度低，大气CO2被吸收到水体中。协方差结构分析表明，生物过程间接影响pCO 2通过pH值和溶解氧浓度，指出初级生产率的贡献作为生物过程的一部分。
Recently, blue carbon – carbon captured by coastal ecosystems – has been gaining increased research attention for its potential to sequester anthropogenic CO2. The Amagasaki Canal, in the inner part of Osaka Bay, Japan, has high nutrient concentrations and phytoplankton abundance; primary production by phytoplankton is high in such hypertrophic environments. This could lead to the enhanced absorption of atmospheric CO2. This study investigated the temporal changes and spatial variability in water quality and CO2flux in the Amagasaki Canal, and it analyzed factors affecting the partial pressure of CO2(pCO2) in canal water using covariance structure analysis. The CO2flux in the canal varied between −24.9 and 66.8 mmol-C/m2/d. There were seasonal changes in water quality, with a tendency of CO2release during autumn and winter. In spring and summer, when phytoplankton were active and chlorophyll-a concentrations were high, concentrations of dissolved inorganic carbon were low and atmospheric CO2was absorbed into the water. Covariance structure analysis indicated that biological processes indirectly influenced pCO2via pH and dissolved oxygen concentrations, pointing to the contribution of the primary production rate as part of the biological processes.