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北极异二烯排放的高温敏感性由解释
Hui Wang1, Allison M Welch2, Sanjeevi Nagalingam2
1Department of Earth System Science, University of California, Irvine, California, USA. huiw16@uci.edu.
北极随着温度变化显著增加异二烯排放量. 结合这一发现,改善了气候模型,纠正了对北极异烯及其长期趋势的低估.
科学领域:
- 生态生态学 生态生态学
- 生物地质化学生物地质化学
- 大气科学 大气科学
背景情况:
- 来自北极生态系统的异二烯排放显示出强烈的温度反应.
- 对这些排放的准确建模对于理解北极气候动态至关重要.
研究的目的:
- 确定关键的北极植物物种,这些物种是高异烯温度敏感性的原因.
- 提高自然气体和气溶排放模型 (MEGAN) 对北极条件的准确性.
主要方法:
- 进行了植物室实验,以测量北极 (Carex spp. 和Eriophorum spp. 这两种植物. ) 的情况.
- 对比了树对其他异二烯发射物的观察到的温度反应和现有的模型预测.
- 将新发现集成到MEGAN模型中,并通过-共变量流量数据评估其性能.
主要成果:
- 树在异烯排放中表现出明显更强的温度反应,而不是其他发射器和当前的MEGAN预测.
- 将数据集成到MEGAN中,提高了其在高度地点复制流量观测的能力.
- 除了这些强烈的温度反应,北半球高度异二烯排放量 (2000-2009) 在社区土地模型中被低估了20%.
结论:
- 树是北极地区对温度敏感的异二烯排放的关键驱动因素.
- 更新的MEGAN模型与北极特定数据增强了气候模型的准确性.
- 之前的模型低估了长期北极异二烯排放趋势的55% (1960-2009).
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