相关实验视频
Updated: Jul 27, 2025

06:27
Simulating Impacts of Ice Storms on Forest Ecosystems
Published on: June 30, 2020
7.0K
模型模拟的土地净初级生产对气候变化的过度积极反应超过环带森林
Shunsuke Tei1, Atsuko Sugimoto1,2,3,4
1Arctic Research Center Hokkaido University Sapporo Japan.
Plant-environment interactions (Hoboken, N.J.)
|June 7, 2023
概括
地球系统模型 (ESM) 可能高估了周边森林的生产力. 观察到的数据显示,对气候变化的反应比模型模拟的要小,表明未来净初级生产 (NPP) 的潜在高估.
科学领域:
- 地球系统科学 地球系统科学
- 生态生态学 生态生态学
- 气候建模气候模型
背景情况:
- 土地碳循环模型对于预测森林生态系统对气候变化的反应至关重要.
- 将地球系统模型 (ESM) 与观测数据进行评估对于理解模型性能和不确定性至关重要.
研究的目的:
- 为了评估CMIP5.5的10个ESM模拟的环带森林的土地净初级产量 (NPP).
- 为了将模型模拟与基于观察的指数进行比较:正常化差异植被指数 (NDVI3g) 和树环宽度指数 (RWI).
主要方法:
- 从10个ESM (CMIP5) 进行模拟的土地NPP与周边森林的NDVI3g和RWI数据进行比较.
- 分析了模型输出和观测指数对过去气候变化 (温度和降水) 的反应.
主要成果:
- 与ESM相比,NDVI3g和RWI显示了类似的模式,包括一年的时间延迟和较小的积极反应过去的气候变化.
- 与NDVI3g和RWI相比,ESM对过去的温度和/或降水变化表现出过于积极的反应.
- 与观察代理相比,模拟的陆地核电站对气候变量表现出过度的敏感性.
结论:
- 当前的ESM可能会高估未来的森林核电站在环礁地区,特别是在预计的全球变暖和降水增加的情况下.
- 对内陆干旱地区 (例如,阿拉斯加内陆,加拿大,西伯利亚东部) 和更热的南部地区 (例如,中欧) 特别注意到潜在的高估.
- 与观测数据对比的模型评估强调了改进ESM的必要性,以改善对森林气候变化影响预测.
相关概念视频
Global Climate Change
24.6K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
24.6K
Primary Production
23.7K
The total amount of energy acquired by primary producers in an ecosystem is called gross primary production (GPP). However, of this energy, producers use some for metabolic processes, and some is lost as heat, decreasing the amount of energy available to the next trophic level. The remaining usable amount of energy is called the net primary productivity (NPP). In terrestrial ecosystems, NPP is driven by climate, while light penetration and nutrient availability drive NPP in aquatic ecosystems.
23.7K
Adaptations that Reduce Water Loss
25.8K
Though evaporation from plant leaves drives transpiration, it also results in loss of water. Because water is critical for photosynthetic reactions and other cellular processes, evolutionary pressures on plants in different environments have driven the acquisition of adaptations that reduce water loss.
25.8K
What is Climate?
18.7K
Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.
18.7K
Responses to Drought and Flooding
10.8K
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to plants.
10.8K
Responses to Heat and Cold Stress
13.6K
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there will be a minimum and maximum temperature that interrupt biological processes.
13.6K

