从稳定的同位素数据在加拿大东部北极群岛和巴芬湾的溶解循环
H C Westbrook1, A Bourbonnais1, C C M Manning2
1School of the Earth, Ocean and Environment University of South Carolina Columbia SC USA.
概括
气候变化影响北极的气来源. 溶解有机 (DON) 是植物浮游生物的关键营养素,在加拿大东部北极群岛和巴芬湾观察到的度和循环变化.
科学领域:
- 环境科学 环境科学
- 海洋学 海洋学 海洋学
- 生物地质化学生物地质化学
背景情况:
- 气候变化正在通过冰川融水和永久土融化改变北极的 (N) 输入.
- 溶解有机 (DON) 可能是北极浮游植物的关键营养来源,但数据很少.
- 了解动态对于预测北极生态系统对气候变化的反应至关重要.
研究的目的:
- 研究北极河流和海洋环境中溶解的来源和循环,特别是DON.
- 在气候敏感地区建立未来营养制度评估的基准.
- 探索DON在支持植物浮游生物活动中的作用.
主要方法:
- 在河流和海洋样本中测量了DON和酸盐 (NO3-) 的度和稳定同位素比 (δ15N, δ18O).
- 利用稳态同位素模型来分析酸盐来源.
- 与叶绿素-a相关联的DON度和同位素,以评估植物浮游生物的消耗.
主要成果:
- 河流中的酸盐同位素标志表明大气沉积,化和浮游植物同化混合.
- 在海洋表面水中,DON度有显著的变化,这表明了动态循环和多种来源.
- 在植物浮游生物的开花中观察到DON消耗,同位素效应为6.9‰.
结论:
- 在加拿大东部的北极群岛和巴芬湾,DON是重要的和可变的源.
- 植物浮游生物积极消耗DON,影响其分布和同位素特征.
- 这项研究为监测气候变化下的北极营养变化提供了必要的基线数据.
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