Li Peiyuan, Wang Zhi-Hua, Wang Chenghao
School of Sustainable Engineering and the Built Environment, Arizona State University, Tempe, AZ, USA.
Discovery Partners Institute, University of Illinois System, Chicago, IL, USA.
Nat Commun. 2024 Mar 18;15(1):2437. doi: 10.1038/s41467-024-46826-3.
Global climate changes, especially the rise of global mean temperature due to the increased carbon dioxide (CO) concentration, can, in turn, result in higher anthropogenic and biogenic greenhouse gas emissions. This potentially leads to a positive loop of climate-carbon feedback in the Earth's climate system, which calls for sustainable environmental strategies that can mitigate both heat and carbon emissions, such as urban greening. In this study, we investigate the impact of urban irrigation over green spaces on ambient temperatures and CO exchange across major cities in the contiguous United States. Our modeling results indicate that the carbon release from urban ecosystem respiration is reduced by evaporative cooling in humid climate, but promoted in arid/semi-arid regions due to increased soil moisture. The irrigation-induced environmental co-benefit in heat and carbon mitigation is, in general, positively correlated with urban greening fraction and has the potential to help counteract climate-carbon feedback in the built environment.
全球气候变化，尤其是由于二氧化碳（CO）浓度增加导致的全球平均气温上升，反过来又会导致更高的人为和生物源温室气体排放。这可能会在地球气候系统中形成气候 - 碳反馈的正循环，这就需要可持续的环境策略来减少热量和碳排放，比如城市绿化。在本研究中，我们调查了美国本土主要城市绿地灌溉对环境温度和碳交换的影响。我们的模型结果表明，在潮湿气候中，蒸发冷却会减少城市生态系统呼吸产生的碳释放，但在干旱/半干旱地区，由于土壤湿度增加，碳释放会增加。灌溉带来的热量和碳减排方面的环境协同效益，总体上与城市绿化比例呈正相关，并且有潜力帮助抵消建筑环境中的气候 - 碳反馈。
