报告详情
Isoprene production and its driving factors in the northwest Pacific Ocean
编号：1246
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更新：2025-01-01 01:09:44
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口头报告
报告开始：2025年01月14日 14:45（Asia/Shanghai）
报告时间：15min
所在会场：[S25] Session 25-IGAC-SOLAS: Chemistry and Physics at Surface Ocean and Lower Atmosphere [S25-2] IGAC-SOLAS: Chemistry and Physics at Surface Ocean and Lower Atmosphere
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摘要
Marine isoprene plays a crucial role in the formation of secondary organic aerosol within
the remote marine boundary layer. Due to scarce field measurements of oceanic isoprene and limited
laboratory-based studies of isoprene production, assessing the importance of marine isoprene on atmospheric
chemistry and climate is challenging. Calculating in-field isoprene production rates is a crucial step to
predict marine isoprene concentrations and the subsequent emissions to the atmosphere. The distribution,
sources, and dominant environmental factors of isoprene were determined in the Northwest Pacific Ocean
in 2019. The nutrient enrichment in the Kuroshio Oyashio Extension (KOE) surface seawater, driven by the
upwelling and atmospheric deposition, promoted the growth of phytoplankton and elevated the isoprene
concentration. This was confirmed by observed responses of isoprene to nutrients and aerosol dust additions
in a ship-based incubation experiment, where the isoprene concentrations increased by 70% (t = 4.417,
p < 0.001) and 35% (t = 2.387, p < 0.05), respectively. Biogenic isoprene production rates in the deck
incubation experiments were positively related to chlorophyll a, temperature, and solar radiation, with an
average production of 7.33 ± 4.27 pmol L−1 day−1. Photochemical degradation of dissolved organic matter
was likely an abiotic source of isoprene, contributing to approximately 14% of the total production. Driven by
high isoprene production and extreme physical disturbance, the KOE showed very high emissions of isoprene
of 46.0 ± 13.0 nmol m−2 day−1, which led to a significant influence on the oxidative capacity of the local
atmosphere.
关键词
isoprene, photochemical production, mixed layer
报告人
Jian Wang
Postdoctor Ocean University of China稿件作者
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重要日期
-
会议日期
01月13日
2025
至01月17日
2025
-
09月27日 2024
初稿截稿日期
-
01月17日 2025
注册截止日期
主办单位
State Key Laboratory of Marine Environmental Science, Xiamen University
承办单位
State Key Laboratory of Marine Environmental Science, Xiamen University
Department of Earth Sciences, National Natural Science Foundation of China
Department of Earth Sciences, National Natural Science Foundation of China
联系方式
- Kejing GU
- xm******@xmu.edu.cn
- +86*********
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