相关实验视频
Updated: Jun 4, 2025

08:39
Simulating Temperature in a Soil Incubation Experiment
Published on: October 28, 2022
2.8K
变暖减少了生态系统呼吸的表面温度敏感度的昼夜差异
Nan Li1, Guiyao Zhou2, Mayank Krishna2
1Northeast Asia Ecosystem Carbon Sink Research Center (NACC), Key Laboratory of Sustainable Forest Ecosystem Management, Ministry of Education, School of Ecology, Northeast Forestry University, Harbin 150040, China.
Plants (Basel, Switzerland)
|December 17, 2024
概括
夜间的生态系统呼吸 (ER) 比白天的ER更敏感于温度. 忽视这种差异会高估年度ER,影响气候变化预测.
科学领域:
- 生态生态学 生态生态学
- 气候科学 气候科学
- 生物地质化学生物地质化学
背景情况:
- 生态系统呼吸 (ER) 对于预测陆地碳汇对气候变暖的反应至关重要.
- 由于日间ER数据有限,ER温度灵敏度的日间变化不太清楚.
- 准确的ER测量对于完善气候模型至关重要.
研究的目的:
- 为了研究生态系统呼吸的温度灵敏度的日间差异.
- 量化这些差异对全球碳预算估计的影响.
- 突出将日间ER变化纳入地球系统模型的必要性.
主要方法:
- 在多年FLUXNET站点数据 (189个站点) 上使用了改进的流量分区方法.
- 在白天 (E0,day) 和夜间 (E0,night) 估计ER的表面温度灵敏度.
- 分析了昼夜差异 (ΔE0 = E0,night/E0,day) 和其驱动因素的季节性变化.
主要成果:
- 在整个生物群中,夜间ER温度敏感度 (E0,night) 显著高于白天 (E0,day).
- 观察到 ΔE0 的显著季节性变化,受温度和 NDVI 的影响.
- 未来的气候变暖预计将减少 ΔE0由于减少了 E0,night.
结论:
- 忽视ER温度灵敏度的日间差异可能导致全球年度ER高估10-80%.
- 纳入不同的白天和夜间ER温度依赖性对于准确的碳气候反预测至关重要.
- 这项研究强调了ER测量中日间分辨率的必要性,以改善气候建模.
相关概念视频
Global Climate Change
24.2K
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.
24.2K
Radiation: Applications
1.1K
The average temperature of Earth is the subject of much current discussion. Earth is in radiative contact with both the Sun and dark space; it receives almost all its energy from the radiation of the Sun and reflects some of it into outer space. Dark space is very cold, about 3 K, so Earth radiates energy into it. For instance, heat transfer occurs from soil and grasses, the rate of which can be so rapid that frost can occur on clear summer evenings, even in warm latitudes.
The average...
The average...
1.1K
Responses to Heat and Cold Stress
13.4K
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.
13.4K
Factors Affecting Body Temperature
3.8K
As a nurse, it is vital to understand the factors affecting body temperature to monitor variations and effectively evaluate deviations from regular.
Factors may include:
Factors may include:
3.8K
What is Climate?
18.3K
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.
18.3K
Temperature Dependence on Reaction Rate
81.1K
The Collision Theory
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
81.1K

