相关实验视频
Updated: Jun 11, 2025

09:54
A Model to Simulate Clinically Relevant Hypoxia in Humans
Published on: December 22, 2016
8.8K
气候变化中的低氧极端事件:机器学习方法和确定性模拟用于威尼斯湖未来发展场景
Federica Zennaro1, Elisa Furlan1, Donata Canu2
1Department of Environmental Sciences, Informatics and Statistics, Ca' Foscari University of Venice, Venice, Italy; Fondazione CMCC - Centro Euro-Mediterraneo sui Cambiamenti Climatici, Italy.
Marine pollution bulletin
|October 4, 2024
概括
气候变化正在增加湖缺氧事件. 机器学习模型预测低溶氧度的上升,影响生态系统的健康,需要有针对性的恢复工作.
科学领域:
- 环境科学 环境科学
- 生态生态学 生态生态学
- 气候变化研究 气候变化研究
背景情况:
- 气候变化导致湖生态系统中溶解氧的减少,导致缺氧 (低溶解氧度).
- 缺氧破坏了生态系统的功能和生物地化学循环,造成了重大的生态后果.
- 预测建模对于理解和减轻未来的缺氧事件至关重要.
研究的目的:
- 研究机器学习 (ML) 和确定性模型在湖生态系统中预测未来缺氧事件的潜力.
- 用各种环境因素对过去的缺氧事件进行分类.
- 在气候变化预测下预测未来的低氧场景.
主要方法:
- 利用机器学习模型,包括随机森林和AdaBoost,来分类历史缺氧事件 (2008-2019).
- 集成的水质,气象和时空数据用于模型培训.
- 集成的水力动力学-生物地球化学模型与气候预测,以估计2050年和2100年的未来情景.
主要成果:
- 在ML模型中,在过去的缺氧事件的分类中,F1得分约为0.83.
- 到2100年,预计缺氧事件将从3.5%增加到8.8%.
- 预计到2100年,夏季缺氧事件将从每年118个增加到每年265个,从而延长缺氧易感的季节.
结论:
- 开发的模型有效地预测了湖生态系统的未来缺氧场景.
- 预计会增加缺氧,特别是在陆地地区,对生态系统健康构成风险.
- 该模型作为一种有价值的工具,用于识别气候威胁湖中的关键恢复热点.
相关概念视频
Design Example: Analyzing Capacity Contours for Flood Risk Assessment
40
Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
40
Global Climate Change
24.3K
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.
24.3K
Precipitation Processes
430
The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
430
Adaptations that Reduce Water Loss
25.2K
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.
25.2K
Hypoxia
967
Hypoxia is a medical condition characterized by an inadequate oxygen supply to body tissues. It typically manifests as a bluish discoloration of the skin and mucosae, especially in fair-skinned individuals, when hemoglobin (Hb) saturation drops below 75%.
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
967
Responses to Drought and Flooding
10.6K
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.
10.6K

