对全球平均变暖的高预测的解释
1National Center for Atmospheric Research, Boulder, CO 80307, USA. wigley@ucar.edu
概括
最新的气候变化预测显示,如果没有缓解政策,到2100年全球气候可能升温1.7至4.9摄氏度. 根据新的分析,极端高或极低的变暖场景是不可能的.
科学领域:
- 气候科学是气候科学.
- 环境科学环境科学
- 大气科学 大气科学
背景情况:
- 政府间气候变化专门委员会 (IPCC) 发布了其第三次评估报告 (TAR),更新了全球平均变暖预测.
- TAR预测的变暖范围 (1.45.8°C) 比IPCC之前的评估高.
研究的目的:
- 为了概率地解释新的IPCC TAR变暖范围.
- 量化气候预测中的不确定性,包括排放,气候敏感性,碳循环,海洋混合和气溶强迫.
主要方法:
- 对IPCC TAR变暖预测的概率分析.
- 考虑气候系统的关键不确定性.
主要成果:
- 在TAR范围的极端高端和极端低端的变暖值的概率非常低.
- 在没有气候减缓政策的情况下,从1990年到2100年全球平均变暖的90%概率区间为1.7°C至4.9°C.
结论:
- 未来全球变暖的最可能范围比完整的TAR范围表明的更窄.
- 紧急的气候变化缓解政策对于避免预计变暖的上限至关重要.
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