関連する実験動画
Updated: Jul 6, 2026

07:07
Lung microRNA Profiling Across the Estrous Cycle in Ozone-exposed Mice
Published on: January 7, 2019
オゾン層の回復の兆しを探している
Elizabeth C Weatherhead1, Signe Bech Andersen
1Cooperative Institute for Research in Environmental Science, Campus Box 216, University of Colorado, Boulder, Colorado 80307, USA. betsy.weatherhead@cires.colorado.edu
Nature
|May 5, 2006
まとめ
モントリオール議定書により,オゾン層を破壊する物質は減少したが,大気の自然な変動により,オゾン層の回復は不確実になる. 将来のオゾン層は,気候変動により,1980年以前の状態とは異なる可能性が高い.
科学分野:
- 大気化学と大気物理学
- 環境科学 環境科学
- 気候変動に関する研究
背景:
- 人為的なオゾン層の枯渇,特に南極のオゾン層の穴は,国際的政策行動につながった.
- モントリオール議定書は,オゾン層を破壊する物質 (ODS) の生産削減を義務付けました.
- オゾン層の回復は,国際的な環境協定の成功としてしばしば引用されています.
研究 の 目的:
- オゾン層の回復の現状を評価する.
- 最近のオゾン層の傾向が,自然変動と対比して,ODSの減少に起因するかどうかを調査する.
- 変化する大気の中で将来のオゾン層の振る舞いを予測する.
主な方法:
- 最近の全列オゾンデータの分析.
- 大気中のオゾン破壊物質濃度の評価.
- オゾンに影響を及ぼす自然要因 (太陽循環,温度,輸送) を考慮する.
主要な成果:
- 全世界のオゾン柱の総量は,過去8年間で減少していない.
- この安定性がODSの減少に起因するかは,高い天然オゾン変動性のために依然として不確実である.
- 大気輸送,温度,微量ガスにおける予想される変化は,将来のオゾン回復に影響を与えるだろう.
結論:
- モントリオール議定書はODSを抑制したが,オゾン回復は1980年以前の水準に戻る保証はない.
- 自然の大気変動は,観測されたオゾン層の動向に大きく影響する.
- 将来のオゾン層の回復は,改変された大気環境の中で起こります.
関連する概念動画
The Carbon Cycle
Carbon is the basis of all organic matter on Earth, and is recycled through the ecosystem in two primary processes: one in which carbon is exchanged among living organisms, and one in which carbon is cycled over long periods of time through fossilized organic remains, weathering of rocks, and volcanic activity. Human activities, including increased agricultural practices and the burning of fossil fuels, has greatly affected the balance of the natural carbon cycle.
Global Climate Change
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.
Hess's Law
There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.
Oxidative Cleavage of Alkenes: Ozonolysis
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Microbial Bioremediation of Pesticides
Pesticides often feature structurally complex chemical architectures, incorporating halogen groups and multiple aromatic rings. These characteristics confer high chemical stability, rendering many pesticides resistant to natural degradation processes. This resistance poses significant environmental concerns, as persistent pesticide residues can accumulate in ecosystems and affect non-target organisms.Despite the inherent stability of many pesticides, certain microorganisms possess the metabolic...

