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Declining Oxygen Level as an Emerging Concern to Global Cities
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-04-27 , DOI: 10.1021/acs.est.1c00553 Yun Wei 1 , Jianguo Wu 2 , Jianping Huang 1 , Xiaoyue Liu 1 , Dongliang Han 1 , Linli An 1 , Haipeng Yu 3 , Jiping Huang 4
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-04-27 , DOI: 10.1021/acs.est.1c00553 Yun Wei 1 , Jianguo Wu 2 , Jianping Huang 1 , Xiaoyue Liu 1 , Dongliang Han 1 , Linli An 1 , Haipeng Yu 3 , Jiping Huang 4
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Rising CO2 concentration and temperatures in urban areas are now well-known, but the potential of an emerging oxygen crisis in the world’s large cities has so far attracted little attention from the science community. Here, we investigated the oxygen balance and its related risks in 391 global large cities (with a population of more than 1 million people) using the oxygen index (OI), which is the ratio of oxygen consumption to oxygen production. Our results show that the global urban areas, occupying only 3.8% of the global land surface, accounted for 39% (14.3 ± 1.5 Gt/yr) of the global terrestrial oxygen consumption during 2001–2015. We estimated that 75% of cities with a population more than 5 million had an OI of greater than 100. Also, cities with larger OI values were correlated with more frequent heatwaves and severe water withdrawals. In addition, cities with excessively large OI values would likely experience severe hypoxia in extremely calm weather. Thus, mitigation measures should be adopted to reduce the urban OI in order to build healthier and more sustainable cities.
中文翻译：
氧气水平下降成为全球城市新关注的问题
城市地区不断上升的 CO 2浓度和温度现已众所周知，但迄今为止，世界大城市可能出现的氧气危机尚未引起科学界的关注。在这里，我们使用氧气指数 (O I )调查了全球 391 个大城市（人口超过 100 万）的氧气平衡及其相关风险，O I是氧气消耗量与氧气产生量的比率。我们的研究结果表明，仅占全球陆地面积 3.8% 的全球城市地区占 2001-2015 年全球陆地耗氧量的 39% (14.3 ± 1.5 Gt/yr)。我们估计 75% 的人口超过 500 万的城市有 O I大于 100。此外，O I值较大的城市与更频繁的热浪和严重的取水相关。此外，O I值过大的城市在极其平静的天气下很可能会出现严重缺氧。因此，应采取缓解措施来减少城市 O I，以建设更健康、更可持续的城市。
更新日期：2021-06-15
中文翻译：
氧气水平下降成为全球城市新关注的问题
城市地区不断上升的 CO 2浓度和温度现已众所周知，但迄今为止，世界大城市可能出现的氧气危机尚未引起科学界的关注。在这里，我们使用氧气指数 (O I )调查了全球 391 个大城市（人口超过 100 万）的氧气平衡及其相关风险，O I是氧气消耗量与氧气产生量的比率。我们的研究结果表明，仅占全球陆地面积 3.8% 的全球城市地区占 2001-2015 年全球陆地耗氧量的 39% (14.3 ± 1.5 Gt/yr)。我们估计 75% 的人口超过 500 万的城市有 O I大于 100。此外，O I值较大的城市与更频繁的热浪和严重的取水相关。此外，O I值过大的城市在极其平静的天气下很可能会出现严重缺氧。因此，应采取缓解措施来减少城市 O I，以建设更健康、更可持续的城市。
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