世界中の河川で溶存酸素が着実に減少しており、包括的な新しい研究により気候変動がその主因であることが特定された。分析された河川系の約80パーセントで過去40年間に低下が見られ、熱帯地域で最も深刻な影響が出ている。
研究者らは、1985年から2023年の間に収集された2万1439の河川区間における観測データを調査した。その結果、酸素濃度は10年あたり平均0.045ミリグラム/リットルの割合で低下しており、河川の78.8パーセントが脱酸素の影響を受けていることが判明した。本研究は中国科学院南京地理湖泊研究所の石崑教授が主導し、関琦博士が筆頭著者として名を連ね、同済大学の研究者らも協力した。
New research shows that efforts to reduce air pollution in Europe, North America and East Asia could accelerate weakening of the Atlantic Meridional Overturning Circulation. The ocean current plays a key role in regulating Europe’s climate. Scientists used multiple climate models to assess the impact under continued high greenhouse gas emissions.
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A major Atlantic Ocean current system that regulates global climate has been slowing down for nearly 20 years. New research provides direct evidence of the decline across a wide area of the North Atlantic.
A new study warns that a shutdown of the Atlantic Meridional Overturning Circulation (AMOC) would trigger the release of up to 640 billion tonnes of carbon dioxide from the deep Southern Ocean near Antarctica. This feedback effect could raise global temperatures by an additional 0.2°C. Researchers at the Potsdam Institute for Climate Impact Research highlight the risk as humanity's emissions continue to weaken the key ocean current.
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Around 40 million of the Philippines' 115 million population lack access to reliable water supply, according to the Department of Environment and Natural Resources (DENR). DENR Undersecretary Carlos Primo David stated that climate change or pollution could compromise water sources for millions. DENR chief Juan Miguel Cuna highlighted the challenge of water bankruptcy facing the country.
The World Meteorological Organization has added the Earth's energy imbalance as a new key indicator in its latest climate report, highlighting how oceans absorb most excess heat. This measure underscores the ongoing warming trend despite yearly temperature fluctuations. The report warns of impacts on food systems from ocean heating and sea level rise.