Identification of Urban Carbon Emission Peaks through Tree-Ring 14C

IF 10.8 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL

环境科学与技术 Pub Date : 2024-09-18 DOI:10.1021/acs.est.4c06041

Zhenchuan Niu, Weijian Zhou, Yunfei Huang, Sen Wang, Guiqian Zhang, Xue Feng, Xuefeng Lu, Mengni Lyu, Jocelyn C. Turnbull

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Abstract

Independent identification of carbon emission peaks determined from fuel inventories is a challenging goal. Because of the complete depletion of radiocarbon (¹⁴C) in fossil fuel sources, the measurement of atmospheric ¹⁴CO₂ has proven to offer a means of achieving this goal. Here, we present a study identifying peak carbon emissions from two Chinese cities using urban tree-ring Δ¹⁴C time series during 2000–2019. After subtracting background atmospheric Δ¹⁴C from urban tree-ring Δ¹⁴C to isolate local Δ¹⁴C (Δ¹⁴C_local), we find a minimum in 2010 (−51.1 ± 4.5‰) in Beijing and in 2013 in Xi’an (−52.5 ± 0.5‰). These levels correspond to an urban carbon emission peak in 2010 and in 2013 in the two respective cities. The urban carbon emission peaks are further identified by the declines of the mean absolute interannual rate of decrease of tree-ring Δ¹⁴C during a period, with the respective values of 3.6 and 6.4 ‰/yr after and before a turning point in Beijing and 3.0 and 6.0 ‰/yr after and before a turning point in Xi’an. This study provides an observation method to identify carbon emission peaks in basin cities.

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通过树环 14C 确定城市碳排放峰值

独立识别根据燃料清单确定的碳排放峰值是一个具有挑战性的目标。由于化石燃料源中的放射性碳（14C）已完全耗尽，因此测量大气中的 14CO2 已被证明是实现这一目标的一种方法。在此，我们利用 2000-2019 年间的城市树环Δ14C 时间序列，对中国两个城市的碳排放峰值进行了研究。从城市树环Δ14C中减去大气本底Δ14C以分离出本地Δ14C（Δ14Clocal）后，我们发现北京在2010年（-51.1±4.5‰）和西安在2013年（-52.5±0.5‰）出现了最低值。这些水平分别对应着两个城市 2010 年和 2013 年的城市碳排放峰值。城市碳排放峰值还可以通过一个时期内树环比Δ14C年际平均绝对下降率的下降来进一步识别，北京在转折点前后分别为3.6和6.4‰/年，西安在转折点前后分别为3.0和6.0‰/年。这项研究为确定流域城市的碳排放峰值提供了一种观测方法。

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来源期刊

环境科学与技术环境科学-工程：环境

CiteScore

17.50

自引率

9.60%

发文量

12359

审稿时长

2.8 months

期刊介绍： Environmental Science & Technology (ES&T) is a co-sponsored academic and technical magazine by the Hubei Provincial Environmental Protection Bureau and the Hubei Provincial Academy of Environmental Sciences. Environmental Science & Technology (ES&T) holds the status of Chinese core journals, scientific papers source journals of China, Chinese Science Citation Database source journals, and Chinese Academic Journal Comprehensive Evaluation Database source journals. This publication focuses on the academic field of environmental protection, featuring articles related to environmental protection and technical advancements.