[A-CG35_28PO1] 陸海相互作用－沿岸生態系に果たす水・物質循環の役割－

[ACG35-P03] 沿岸域における海底湧水と一次生産過程の同時モニタリング手法の開発

*杉本 亮¹、大河内 允基¹、本田 尚美¹、小路 淳²、大沢 信二³、谷口 真人⁴ (1.福井県立大学、2.広島大学、3.京都大学、4.総合地球環境学研究所)

キーワード：同時モニタリング, 海底湧水, 一次生産, 沿岸海域

In recent years, a number of studies have shown that submarine groundwater discharge is an alternative nutrient pathway and can drive primary production in coastal seas. However, very little is known about quantitative relationship between input of groundwater and response of primary production, because both processes are temporally variable. Recent technological advances (i.e., automation) have increased our ability to assess submarine groundwater discharge in coastal ecosystems using natural tracers such as radon-222 (²²²Rn). Simultaneous monitoring of ²²²Rn with indicators of primary production such as pCO₂ and/or chlorophyll-a would allow us to grasp the nexus of both processes. Therefore, automated radon and CO₂ gas analyzer were connected in series and a closed air loop was established with gas equilibration devices to examine the nexus between submarine groundwater discharge and primary production. In this presentation, we will report the results of simultaneous monitoring of ²²²Rn and pCO₂ with other parameters in several coastal environments.