Research press release


Nature Geoscience

Transport from China offsets expected US reduction in ozone pollution



Willem Verstraetenたちは、2005~2010年の中国と米国西部の対流圏オゾン濃度変化を、人工衛星観測と化学輸送計算モデルを用いて評価した。彼らは中国全体にわたるオゾン濃度の顕著な変化を見つけたが、米国西部では大気汚染規制が厳しくなっているにもかかわらず大きな変化は見つからなかった。中国全体からの放出量増加がある場合とない場合のシミュレーション結果を比較することで、彼らは中国全体の放出による相殺量を約43%と定量化している。

Concentrations of polluting ozone in the low troposphere have increased in China between 2005 and 2010, in response to both rising emissions and increased downward transport from higher atmospheric layers, concludes a study published online in Nature Geoscience. The rise in ozone and emissions of its precursor substances from China has offset 43% of the improvements in air quality expected in the western United States in response to tighter regulations.

Ozone acts as a greenhouse gas in the lowest layer of the atmosphere, the troposphere, and high ozone concentrations near the surface have adverse effects on human and environmental health. Ozone levels are largely determined by local emissions of precursor substances such as nitrogen oxides and hydrocarbons, as well as long-range transport by the winds.

Willem Verstraeten and colleagues assess changes in tropospheric ozone concentrations over China and the western United States between 2005 and 2010, using satellite observations along with a chemical transport computer model. They find a significant increase in ozone concentrations over China, and no significant change over the western US - despite tightening air pollution regulations. Comparing simulations with and without the rise in emissions over China, they quantify the offset from emissions over China at 43%.

doi: 10.1038/ngeo2493


メールマガジンリストの「Nature 関連誌今週のハイライト」にチェックをいれていただきますと、毎週各ジャーナルからの最新の「注目のハイライト」をまとめて皆様にお届けいたします。