Presentation Details
Isoprene production and its driving factors in the northwest Pacific Ocean
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Updated Time：2025-01-01 01:09:44
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Oral Presentation
Start Time：2025-01-14 14:45（Asia/Shanghai）
Duration：15min
Session：S25 Session 25-IGAC-SOLAS: Chemistry and Physics at Surface Ocean and Lower Atmosphere »
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Abstract
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.
Keywords
isoprene, photochemical production, mixed layer
Speaker
Jian Wang
Postdoctor Ocean University of ChinaSubmission Author
All Comments
Important Date
-
Conference Date
Jan 13
2025
toJan 17
2025
-
Sep 27 2024
Draft paper submission deadline
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Feb 17 2025
Registration deadline
Sponsored By
State Key Laboratory of Marine Environmental Science, Xiamen University
Organized By
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
Contact Information
- Kejing GU
- xm******@xmu.edu.cn
- +86*********
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