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April 22, 2026SCIENTIA SINICA Terrae0 citationsOpen Access

Enso对海洋异戊二烯排放年际变率的影响

梦孙梦莹 孙磊宋磊 宋乐崔乐辉 崔

Key Points

  • This research aims to clarify the impact of ENSO on interannual variations of marine isoprene emissions and their underlying mechanisms.
  • Utilized U-Net convolutional neural networks to reconstruct long-term sea surface chlorophyll a data.
  • Calculated marine isoprene emission flux parameters considering phytoplankton biology and photochemical processes.
  • Developed a global marine isoprene emission flux dataset spanning from 1950 to 2020.
  • Interannual variation of marine isoprene emissions is most significant in the tropical Pacific and significantly correlated with ENSO phases.
  • During El Niño winters, isoprene emissions in the tropical Pacific decrease by approximately 2.34×10^9 g (about 16%) compared to La Niña winters.
  • Changes in sea surface temperature, solar radiation, wind fields, and chlorophyll content collectively modulate emissions.

Abstract

海洋与大气之间通过能量交换和物质循环过程在全球气候系统中发挥着关键作用。厄尔尼诺-南方涛动(ENSO)作为年际尺度上海气系统变率的主导模态,通过调制海表温度、海洋环流及营养物质供给,进而影响大气环流、海洋生产力以及海洋生物源物质的释放过程。异戊二烯是海洋中排放量最高的生物源挥发性有机物(BVOCs),在二次有机气溶胶形成及气候反馈中发挥着重要作用。然而,受限于排放数据集的时间尺度短以及参数化方案不完善,ENSO对海洋BVOCs排放年际变化的影响仍缺乏清晰认识。本研究首先采用U-Net卷积神经网络方法重建海表叶绿素a浓度长期数据集,再将其用于海洋异戊二烯排放通量参数化方案计算中,同时考虑浮游植物生物过程和海洋微表层光化学过程的异戊二烯生成与释放,最终构建出一套覆盖1950–2020年的全球海洋异戊二烯排放通量数据集。结果表明,海洋异戊二烯排放的年际变率在热带太平洋海域最为显著,并与ENSO位相显著相关。在厄尔尼诺(El Niño)年与拉尼娜(La Niña)年,热带太平洋的异戊二烯排放在冬季表现出最大差异:相较于La Niña年,El Niño年冬季该区域异戊二烯排放减少约2.34×109 g(约16%)。ENSO位相转换所引起的海表温度、太阳辐射、海表风场及浮游植物叶绿素总量的协同变化,共同调制了海洋异戊二烯的排放通量。本研究加深了ENSO对BVOCs排放作用机制的认识,并为提升年际尺度上海气物质交换过程的预测水平提供科学依据。

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Cite This Study

孙 et al. (2026) studied this question.

synapsesocial.com/papers/69e867356e0dea528ddeb911https://doi.org/10.1360/n072025-0235
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