日本地球惑星科学連合2023年大会

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[J] オンラインポスター発表

セッション記号 A (大気水圏科学) » A-OS 海洋科学・海洋環境

[A-OS17] 沿岸域の海洋循環と物質循環

2023年5月24日(水) 10:45 〜 12:15 オンラインポスターZoom会場 (4) (オンラインポスター)

コンビーナ:和田 茂樹(筑波大学)、高橋 大介(東海大学)、永井 平(水産研究教育機構)、増永 英治(Ibaraki University)

現地ポスター発表開催日時 (2023/5/23 17:15-18:45)

10:45 〜 12:15

[AOS17-P12] 瀬戸内海と隣接海域における大気・海洋間二酸化炭素フラックスの空間分布とその変動

*林 美鶴1、藤田 眞大2、山下 栄次3、廣川 綜一4 (1.神戸大学内海域環境教育研究センター、2.神戸大学海事科学部、3.岡山理科大学、4.神戸大学大学院海事科学研究科)

キーワード:二酸化炭素、瀬戸内海、フラックス

It is important to understand the behavior of carbon dioxide (CO2) in the sea, especially in terms of its relation to climate change in coastal seas, blue carbon, ocean acidification, etc. The partial pressure of CO2 in seawater (pCO2) and atmospheric CO2 concentration (PCO2) in the Seto Inland Sea and adjacent regions were measured onboard in summer and in early spring over a period of 16 years. CO2 fluxes each bay and strait were calculated, and variable factors of CO2 fluxes were estimated based on measuarement data and the calculation theoretical formula. CO2 was absorbed into the ocean in all in spring. It seems that the absorption flux was in the straits smaller than that in the adjacent bays. In summer, CO2 was released from the ocean in narrow straits and bays in the Seto Inland Sea except Osaka Bay. It was absorbed in Osaka Bay, Bungo and Kii Channels and the open ocean. It seems that the release flux was in the straits larger than that in the adjacent bays. Contribution of pCO2 in the flux was the biggest. The contribution ratio of pCO2 to the flux in summer was around 60%. The contribution ratio of pCO2 in spring was 50% or less, and it of the water temperature was 10% or more.