[A-CG15] 沿岸海洋生態系──２．サンゴ礁・海草藻場・マングローブ

[ACG15-02] 人間活動の影響を受けた河口浅海域における大気中CO₂の吸収に関する現地観測と生態系モデリング

*桑江 朝比呂¹、神田 穣太²、久保 篤史²、中島 典之³、小川 浩史⁴、相馬 明郎⁵、鈴村 昌弘⁶ (1.港湾空港技術研究所、2.東京海洋大学、3.東京大学、4.東京大学大気海洋研究所、5.みずほ情報総研、6.産業技術総合研究所)

キーワード：ブルーカーボン、気候変動、生態系モデル

Estuarine and shallow coastal systems (ESCS) are recognized as not only significant carbon reservoirs but also net emitters of CO₂ to the atmosphere, posing the dilemma of how ESCS functions relate to climate change mitigation. However, some studies have shown that ESCS take up atmospheric CO₂. Here we reviewed empirical studies and developed a new ecosystem model to investigate the magnitude and determinants of net uptake atmospheric CO₂ by ESCS. We found that the capability of ESCS to function as CO₂ sinks is enhanced by environmental conditions that are typical of human-dominated systems (e.g., input of high terrestrial nutrients, input of treated wastewater in which labile carbon is highly removed, and presence of hypoxia).