人类产生的铁改变了北太平洋过渡区春季植物浮游生物的开花
Nicholas J Hawco1, Tim M Conway2, Sacha N Coesel3
1Department of Oceanography, University of Hawai'i at Mānoa, Honolulu, HI 96822.
概括
人类活动显著地为北太平洋提供铁,推动了春季植物浮游生物的开花. 这种增强的铁供应加速了营养物质的消耗,并可能使海洋生态系统向极端转移.
科学领域:
- 海洋学 海洋学 海洋学
- 海洋生态海洋生态学
- 生物地质化学生物地质化学
背景情况:
- 工业活动增加了海洋中的铁,但范围和生态影响尚不清楚.
- 北太平洋过渡区是研究海洋与大气相互作用的关键区域.
研究的目的:
- 量化人类对北太平洋表面海洋的铁贡献.
- 评估增加铁供应对植物浮游生物繁荣和营养循环的生态后果.
主要方法:
- 四次探险到北太平洋过渡区.
- 铁源的同位素分析.
- 基因表达的转录基因分析.
- 卫星海洋颜色数据分析.
主要成果:
- 春季观察到来自大气来源的同位素轻铁的持续供应.
- 人类产生的来源对海洋表面的铁预算贡献了约39%±9%.
- 铁压力基因和铁和的共同限制的证据表明,铁可以刺激植物浮游生物的生长.
- 观察到的趋势与卫星数据一致,这些数据显示春季的花期较短,较强烈,夏季早些时候的寡量化条件.
结论:
- 大气中的铁沉积,受到人类活动的显著影响,刺激了北太平洋的春季植物浮游生物的开花.
- 这一过程加快了酸盐的消耗,并可能导致海洋生态系统的极移,以及气候变化的影响.
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