大气CO2增长率对陆地水储量的观察变化的敏感性
Vincent Humphrey1, Jakob Zscheischler2, Philippe Ciais3
1Institute for Atmospheric and Climate Science, ETH Zurich, Zurich, Switzerland. vincent.humphrey@env.ethz.ch.
Nature
|August 31, 2018
概括
陆地生态系统吸收大量的二氧化碳 (CO2) 排放. 这项研究揭示了陆地水储量的变化, 不仅仅是温度, 强烈影响二氧化碳增长率, 影响全球碳汇.
科学领域:
- 地球系统科学
- 气候科学
- 生态学
背景情况:
- 陆地生态系统是重要的碳汇,每年吸收大约30%的人为二氧化碳 (CO2) 排放.
- 大气二氧化碳增长率的变化主要是由陆地生态系统碳吸收的波动驱动的.
- 之前的研究集中在温度敏感度上,由于有限的直接观测数据,全球水资源的作用尚不清楚.
研究的目的:
- 研究陆地水资源对全球和区域碳循环变化的影响.
- 用新的卫星重量测量数据直接观察陆地水储量变化.
- 评估水资源对陆地碳汇的影响及其在当前碳循环模型中的表现.
主要方法:
- 分析最近的卫星重力测量观测,以推导陆地水储量的变化.
- 陆地储水变化与大气二氧化碳增长率的相关性.
- 观察到的水可用性效应与已知的温度效应以及当前碳循环模型的比较.
主要成果:
- 发现大气二氧化碳增长率对陆地水储量的变化具有强烈的敏感性.
- 由于陆地储水量减少,干旱的年份与大气二氧化碳的增长速度更快有关.
- 发现水储量与二氧化碳增长之间的关系独立于温度效应,目前碳循环模型低估了这种关系.
结论:
- 陆地水储量的年间波动对陆地碳汇产生重大影响.
- 这些发现强调了水和碳循环之间的相互作用对于理解全球碳动态的重要性.
- 碳循环的准确建模需要更好地整合水的可用性.
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