日本地球惑星科学連合2023年大会

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[E] 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-CG 大気海洋・環境科学複合領域・一般

[A-CG31] Nutrient footprint of primary production in the coastal and marginal seas of East and Southeast Asia

2023年5月22日(月) 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:張 勁(富山大学 学術研究部理学系)、森本 昭彦(愛媛大学)、Qian Liu(Ocean University of China)、Takahiro Endoh(RIAM Research Institute for Applied Mechanics)

現地ポスター発表開催日時 (2023/5/21 17:15-18:45)

10:45 〜 12:15

[ACG31-P05] A driving factor for harmful algal blooms in the East China Sea coastal marine ecosystems

*Hong Che1、Jing Zhang2、Qian Liu3、Meixun Zhao3、Zhi-Qi Zhao4 (1.Qingdao Marine Science and Technology Center、2.Univ. of Toyama、3.Ocean Univ. of China、4.Chang'an Univ.)

キーワード:Harmful algal blooms, Kuroshio subsurface water, Nd isotopes, East China Sea, Coastal ecological environment

Quantitative calculation of the supply ratio of nutrients by different water masses suggests that the intrusion of Kuroshio subsurface water (KSSW) may indeed be an important factor in the formation of harmful algal blooms (HABs) in the Min-Zhe coastal area. This region in China has a complex hydrographic structure as well as a high incidence of HABs. The results of the calculations of the dissolved neodymium and its isotopes show that KSSW is an important provider of dissolved inorganic nitrogen (30–90 %) and phosphates (80–100 %) compared to the cases of the Taiwan Warm Current and the Changjiang Diluted Water. Sensitivity analysis results indicate that the percent contribution of KSSW in volume increased to 50–60 % in June, supplying favorable conditions for the growth of harmful algae. Our study implies that the invasion of the Kuroshio is likely to be a driving factor of HABs and, accordingly, a key factor in predicting HABs.